1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
|
/*
* "Ostensibly Recursive's Twin" merge strategy, or "ort" for short. Meant
* as a drop-in replacement for the "recursive" merge strategy, allowing one
* to replace
*
* git merge [-s recursive]
*
* with
*
* git merge -s ort
*
* Note: git's parser allows the space between '-s' and its argument to be
* missing. (Should I have backronymed "ham", "alsa", "kip", "nap, "alvo",
* "cale", "peedy", or "ins" instead of "ort"?)
*/
#include "cache.h"
#include "merge-ort.h"
#include "alloc.h"
#include "blob.h"
#include "cache-tree.h"
#include "commit.h"
#include "commit-reach.h"
#include "diff.h"
#include "diffcore.h"
#include "dir.h"
#include "ll-merge.h"
#include "object-store.h"
#include "revision.h"
#include "strmap.h"
#include "submodule.h"
#include "tree.h"
#include "unpack-trees.h"
#include "xdiff-interface.h"
/*
* We have many arrays of size 3. Whenever we have such an array, the
* indices refer to one of the sides of the three-way merge. This is so
* pervasive that the constants 0, 1, and 2 are used in many places in the
* code (especially in arithmetic operations to find the other side's index
* or to compute a relevant mask), but sometimes these enum names are used
* to aid code clarity.
*
* See also 'filemask' and 'dirmask' in struct conflict_info; the "ith side"
* referred to there is one of these three sides.
*/
enum merge_side {
MERGE_BASE = 0,
MERGE_SIDE1 = 1,
MERGE_SIDE2 = 2
};
struct traversal_callback_data {
unsigned long mask;
unsigned long dirmask;
struct name_entry names[3];
};
struct rename_info {
/*
* All variables that are arrays of size 3 correspond to data tracked
* for the sides in enum merge_side. Index 0 is almost always unused
* because we often only need to track information for MERGE_SIDE1 and
* MERGE_SIDE2 (MERGE_BASE can't have rename information since renames
* are determined relative to what changed since the MERGE_BASE).
*/
/*
* pairs: pairing of filenames from diffcore_rename()
*/
struct diff_queue_struct pairs[3];
/*
* dirs_removed: directories removed on a given side of history.
*/
struct strset dirs_removed[3];
/*
* dir_rename_count: tracking where parts of a directory were renamed to
*
* When files in a directory are renamed, they may not all go to the
* same location. Each strmap here tracks:
* old_dir => {new_dir => int}
* That is, dir_rename_count[side] is a strmap to a strintmap.
*/
struct strmap dir_rename_count[3];
/*
* dir_renames: computed directory renames
*
* This is a map of old_dir => new_dir and is derived in part from
* dir_rename_count.
*/
struct strmap dir_renames[3];
/*
* relevant_sources: deleted paths for which we need rename detection
*
* relevant_sources is a set of deleted paths on each side of
* history for which we need rename detection. If a path is deleted
* on one side of history, we need to detect if it is part of a
* rename if either
* * we need to detect renames for an ancestor directory
* * the file is modified/deleted on the other side of history
* If neither of those are true, we can skip rename detection for
* that path.
*/
struct strset relevant_sources[3];
/*
* dir_rename_mask:
* 0: optimization removing unmodified potential rename source okay
* 2 or 4: optimization okay, but must check for files added to dir
* 7: optimization forbidden; need rename source in case of dir rename
*/
unsigned dir_rename_mask:3;
/*
* callback_data_*: supporting data structures for alternate traversal
*
* We sometimes need to be able to traverse through all the files
* in a given tree before all immediate subdirectories within that
* tree. Since traverse_trees() doesn't do that naturally, we have
* a traverse_trees_wrapper() that stores any immediate
* subdirectories while traversing files, then traverses the
* immediate subdirectories later. These callback_data* variables
* store the information for the subdirectories so that we can do
* that traversal order.
*/
struct traversal_callback_data *callback_data;
int callback_data_nr, callback_data_alloc;
char *callback_data_traverse_path;
/*
* needed_limit: value needed for inexact rename detection to run
*
* If the current rename limit wasn't high enough for inexact
* rename detection to run, this records the limit needed. Otherwise,
* this value remains 0.
*/
int needed_limit;
};
struct merge_options_internal {
/*
* paths: primary data structure in all of merge ort.
*
* The keys of paths:
* * are full relative paths from the toplevel of the repository
* (e.g. "drivers/firmware/raspberrypi.c").
* * store all relevant paths in the repo, both directories and
* files (e.g. drivers, drivers/firmware would also be included)
* * these keys serve to intern all the path strings, which allows
* us to do pointer comparison on directory names instead of
* strcmp; we just have to be careful to use the interned strings.
* (Technically paths_to_free may track some strings that were
* removed from froms paths.)
*
* The values of paths:
* * either a pointer to a merged_info, or a conflict_info struct
* * merged_info contains all relevant information for a
* non-conflicted entry.
* * conflict_info contains a merged_info, plus any additional
* information about a conflict such as the higher orders stages
* involved and the names of the paths those came from (handy
* once renames get involved).
* * a path may start "conflicted" (i.e. point to a conflict_info)
* and then a later step (e.g. three-way content merge) determines
* it can be cleanly merged, at which point it'll be marked clean
* and the algorithm will ignore any data outside the contained
* merged_info for that entry
* * If an entry remains conflicted, the merged_info portion of a
* conflict_info will later be filled with whatever version of
* the file should be placed in the working directory (e.g. an
* as-merged-as-possible variation that contains conflict markers).
*/
struct strmap paths;
/*
* conflicted: a subset of keys->values from "paths"
*
* conflicted is basically an optimization between process_entries()
* and record_conflicted_index_entries(); the latter could loop over
* ALL the entries in paths AGAIN and look for the ones that are
* still conflicted, but since process_entries() has to loop over
* all of them, it saves the ones it couldn't resolve in this strmap
* so that record_conflicted_index_entries() can iterate just the
* relevant entries.
*/
struct strmap conflicted;
/*
* paths_to_free: additional list of strings to free
*
* If keys are removed from "paths", they are added to paths_to_free
* to ensure they are later freed. We avoid free'ing immediately since
* other places (e.g. conflict_info.pathnames[]) may still be
* referencing these paths.
*/
struct string_list paths_to_free;
/*
* output: special messages and conflict notices for various paths
*
* This is a map of pathnames (a subset of the keys in "paths" above)
* to strbufs. It gathers various warning/conflict/notice messages
* for later processing.
*/
struct strmap output;
/*
* renames: various data relating to rename detection
*/
struct rename_info renames;
/*
* current_dir_name, toplevel_dir: temporary vars
*
* These are used in collect_merge_info_callback(), and will set the
* various merged_info.directory_name for the various paths we get;
* see documentation for that variable and the requirements placed on
* that field.
*/
const char *current_dir_name;
const char *toplevel_dir;
/* call_depth: recursion level counter for merging merge bases */
int call_depth;
};
struct version_info {
struct object_id oid;
unsigned short mode;
};
struct merged_info {
/* if is_null, ignore result. otherwise result has oid & mode */
struct version_info result;
unsigned is_null:1;
/*
* clean: whether the path in question is cleanly merged.
*
* see conflict_info.merged for more details.
*/
unsigned clean:1;
/*
* basename_offset: offset of basename of path.
*
* perf optimization to avoid recomputing offset of final '/'
* character in pathname (0 if no '/' in pathname).
*/
size_t basename_offset;
/*
* directory_name: containing directory name.
*
* Note that we assume directory_name is constructed such that
* strcmp(dir1_name, dir2_name) == 0 iff dir1_name == dir2_name,
* i.e. string equality is equivalent to pointer equality. For this
* to hold, we have to be careful setting directory_name.
*/
const char *directory_name;
};
struct conflict_info {
/*
* merged: the version of the path that will be written to working tree
*
* WARNING: It is critical to check merged.clean and ensure it is 0
* before reading any conflict_info fields outside of merged.
* Allocated merge_info structs will always have clean set to 1.
* Allocated conflict_info structs will have merged.clean set to 0
* initially. The merged.clean field is how we know if it is safe
* to access other parts of conflict_info besides merged; if a
* conflict_info's merged.clean is changed to 1, the rest of the
* algorithm is not allowed to look at anything outside of the
* merged member anymore.
*/
struct merged_info merged;
/* oids & modes from each of the three trees for this path */
struct version_info stages[3];
/* pathnames for each stage; may differ due to rename detection */
const char *pathnames[3];
/* Whether this path is/was involved in a directory/file conflict */
unsigned df_conflict:1;
/*
* Whether this path is/was involved in a non-content conflict other
* than a directory/file conflict (e.g. rename/rename, rename/delete,
* file location based on possible directory rename).
*/
unsigned path_conflict:1;
/*
* For filemask and dirmask, the ith bit corresponds to whether the
* ith entry is a file (filemask) or a directory (dirmask). Thus,
* filemask & dirmask is always zero, and filemask | dirmask is at
* most 7 but can be less when a path does not appear as either a
* file or a directory on at least one side of history.
*
* Note that these masks are related to enum merge_side, as the ith
* entry corresponds to side i.
*
* These values come from a traverse_trees() call; more info may be
* found looking at tree-walk.h's struct traverse_info,
* particularly the documentation above the "fn" member (note that
* filemask = mask & ~dirmask from that documentation).
*/
unsigned filemask:3;
unsigned dirmask:3;
/*
* Optimization to track which stages match, to avoid the need to
* recompute it in multiple steps. Either 0 or at least 2 bits are
* set; if at least 2 bits are set, their corresponding stages match.
*/
unsigned match_mask:3;
};
/*** Function Grouping: various utility functions ***/
/*
* For the next three macros, see warning for conflict_info.merged.
*
* In each of the below, mi is a struct merged_info*, and ci was defined
* as a struct conflict_info* (but we need to verify ci isn't actually
* pointed at a struct merged_info*).
*
* INITIALIZE_CI: Assign ci to mi but only if it's safe; set to NULL otherwise.
* VERIFY_CI: Ensure that something we assigned to a conflict_info* is one.
* ASSIGN_AND_VERIFY_CI: Similar to VERIFY_CI but do assignment first.
*/
#define INITIALIZE_CI(ci, mi) do { \
(ci) = (!(mi) || (mi)->clean) ? NULL : (struct conflict_info *)(mi); \
} while (0)
#define VERIFY_CI(ci) assert(ci && !ci->merged.clean);
#define ASSIGN_AND_VERIFY_CI(ci, mi) do { \
(ci) = (struct conflict_info *)(mi); \
assert((ci) && !(mi)->clean); \
} while (0)
static void free_strmap_strings(struct strmap *map)
{
struct hashmap_iter iter;
struct strmap_entry *entry;
strmap_for_each_entry(map, &iter, entry) {
free((char*)entry->key);
}
}
static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
int reinitialize)
{
struct rename_info *renames = &opti->renames;
int i;
void (*strmap_func)(struct strmap *, int) =
reinitialize ? strmap_partial_clear : strmap_clear;
void (*strset_func)(struct strset *) =
reinitialize ? strset_partial_clear : strset_clear;
/*
* We marked opti->paths with strdup_strings = 0, so that we
* wouldn't have to make another copy of the fullpath created by
* make_traverse_path from setup_path_info(). But, now that we've
* used it and have no other references to these strings, it is time
* to deallocate them.
*/
free_strmap_strings(&opti->paths);
strmap_func(&opti->paths, 1);
/*
* All keys and values in opti->conflicted are a subset of those in
* opti->paths. We don't want to deallocate anything twice, so we
* don't free the keys and we pass 0 for free_values.
*/
strmap_func(&opti->conflicted, 0);
/*
* opti->paths_to_free is similar to opti->paths; we created it with
* strdup_strings = 0 to avoid making _another_ copy of the fullpath
* but now that we've used it and have no other references to these
* strings, it is time to deallocate them. We do so by temporarily
* setting strdup_strings to 1.
*/
opti->paths_to_free.strdup_strings = 1;
string_list_clear(&opti->paths_to_free, 0);
opti->paths_to_free.strdup_strings = 0;
/* Free memory used by various renames maps */
for (i = MERGE_SIDE1; i <= MERGE_SIDE2; ++i) {
strset_func(&renames->dirs_removed[i]);
partial_clear_dir_rename_count(&renames->dir_rename_count[i]);
if (!reinitialize)
strmap_clear(&renames->dir_rename_count[i], 1);
strmap_func(&renames->dir_renames[i], 0);
strset_func(&renames->relevant_sources[i]);
}
if (!reinitialize) {
struct hashmap_iter iter;
struct strmap_entry *e;
/* Release and free each strbuf found in output */
strmap_for_each_entry(&opti->output, &iter, e) {
struct strbuf *sb = e->value;
strbuf_release(sb);
/*
* While strictly speaking we don't need to free(sb)
* here because we could pass free_values=1 when
* calling strmap_clear() on opti->output, that would
* require strmap_clear to do another
* strmap_for_each_entry() loop, so we just free it
* while we're iterating anyway.
*/
free(sb);
}
strmap_clear(&opti->output, 0);
}
renames->dir_rename_mask = 0;
/* Clean out callback_data as well. */
FREE_AND_NULL(renames->callback_data);
renames->callback_data_nr = renames->callback_data_alloc = 0;
}
static int err(struct merge_options *opt, const char *err, ...)
{
va_list params;
struct strbuf sb = STRBUF_INIT;
strbuf_addstr(&sb, "error: ");
va_start(params, err);
strbuf_vaddf(&sb, err, params);
va_end(params);
error("%s", sb.buf);
strbuf_release(&sb);
return -1;
}
static void format_commit(struct strbuf *sb,
int indent,
struct commit *commit)
{
struct merge_remote_desc *desc;
struct pretty_print_context ctx = {0};
ctx.abbrev = DEFAULT_ABBREV;
strbuf_addchars(sb, ' ', indent);
desc = merge_remote_util(commit);
if (desc) {
strbuf_addf(sb, "virtual %s\n", desc->name);
return;
}
format_commit_message(commit, "%h %s", sb, &ctx);
strbuf_addch(sb, '\n');
}
__attribute__((format (printf, 4, 5)))
static void path_msg(struct merge_options *opt,
const char *path,
int omittable_hint, /* skippable under --remerge-diff */
const char *fmt, ...)
{
va_list ap;
struct strbuf *sb = strmap_get(&opt->priv->output, path);
if (!sb) {
sb = xmalloc(sizeof(*sb));
strbuf_init(sb, 0);
strmap_put(&opt->priv->output, path, sb);
}
va_start(ap, fmt);
strbuf_vaddf(sb, fmt, ap);
va_end(ap);
strbuf_addch(sb, '\n');
}
/* add a string to a strbuf, but converting "/" to "_" */
static void add_flattened_path(struct strbuf *out, const char *s)
{
size_t i = out->len;
strbuf_addstr(out, s);
for (; i < out->len; i++)
if (out->buf[i] == '/')
out->buf[i] = '_';
}
static char *unique_path(struct strmap *existing_paths,
const char *path,
const char *branch)
{
struct strbuf newpath = STRBUF_INIT;
int suffix = 0;
size_t base_len;
strbuf_addf(&newpath, "%s~", path);
add_flattened_path(&newpath, branch);
base_len = newpath.len;
while (strmap_contains(existing_paths, newpath.buf)) {
strbuf_setlen(&newpath, base_len);
strbuf_addf(&newpath, "_%d", suffix++);
}
return strbuf_detach(&newpath, NULL);
}
/*** Function Grouping: functions related to collect_merge_info() ***/
static int traverse_trees_wrapper_callback(int n,
unsigned long mask,
unsigned long dirmask,
struct name_entry *names,
struct traverse_info *info)
{
struct merge_options *opt = info->data;
struct rename_info *renames = &opt->priv->renames;
unsigned filemask = mask & ~dirmask;
assert(n==3);
if (!renames->callback_data_traverse_path)
renames->callback_data_traverse_path = xstrdup(info->traverse_path);
if (filemask && filemask == renames->dir_rename_mask)
renames->dir_rename_mask = 0x07;
ALLOC_GROW(renames->callback_data, renames->callback_data_nr + 1,
renames->callback_data_alloc);
renames->callback_data[renames->callback_data_nr].mask = mask;
renames->callback_data[renames->callback_data_nr].dirmask = dirmask;
COPY_ARRAY(renames->callback_data[renames->callback_data_nr].names,
names, 3);
renames->callback_data_nr++;
return mask;
}
/*
* Much like traverse_trees(), BUT:
* - read all the tree entries FIRST, saving them
* - note that the above step provides an opportunity to compute necessary
* additional details before the "real" traversal
* - loop through the saved entries and call the original callback on them
*/
static int traverse_trees_wrapper(struct index_state *istate,
int n,
struct tree_desc *t,
struct traverse_info *info)
{
int ret, i, old_offset;
traverse_callback_t old_fn;
char *old_callback_data_traverse_path;
struct merge_options *opt = info->data;
struct rename_info *renames = &opt->priv->renames;
assert(renames->dir_rename_mask == 2 || renames->dir_rename_mask == 4);
old_callback_data_traverse_path = renames->callback_data_traverse_path;
old_fn = info->fn;
old_offset = renames->callback_data_nr;
renames->callback_data_traverse_path = NULL;
info->fn = traverse_trees_wrapper_callback;
ret = traverse_trees(istate, n, t, info);
if (ret < 0)
return ret;
info->traverse_path = renames->callback_data_traverse_path;
info->fn = old_fn;
for (i = old_offset; i < renames->callback_data_nr; ++i) {
info->fn(n,
renames->callback_data[i].mask,
renames->callback_data[i].dirmask,
renames->callback_data[i].names,
info);
}
renames->callback_data_nr = old_offset;
free(renames->callback_data_traverse_path);
renames->callback_data_traverse_path = old_callback_data_traverse_path;
info->traverse_path = NULL;
return 0;
}
static void setup_path_info(struct merge_options *opt,
struct string_list_item *result,
const char *current_dir_name,
int current_dir_name_len,
char *fullpath, /* we'll take over ownership */
struct name_entry *names,
struct name_entry *merged_version,
unsigned is_null, /* boolean */
unsigned df_conflict, /* boolean */
unsigned filemask,
unsigned dirmask,
int resolved /* boolean */)
{
/* result->util is void*, so mi is a convenience typed variable */
struct merged_info *mi;
assert(!is_null || resolved);
assert(!df_conflict || !resolved); /* df_conflict implies !resolved */
assert(resolved == (merged_version != NULL));
mi = xcalloc(1, resolved ? sizeof(struct merged_info) :
sizeof(struct conflict_info));
mi->directory_name = current_dir_name;
mi->basename_offset = current_dir_name_len;
mi->clean = !!resolved;
if (resolved) {
mi->result.mode = merged_version->mode;
oidcpy(&mi->result.oid, &merged_version->oid);
mi->is_null = !!is_null;
} else {
int i;
struct conflict_info *ci;
ASSIGN_AND_VERIFY_CI(ci, mi);
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
ci->pathnames[i] = fullpath;
ci->stages[i].mode = names[i].mode;
oidcpy(&ci->stages[i].oid, &names[i].oid);
}
ci->filemask = filemask;
ci->dirmask = dirmask;
ci->df_conflict = !!df_conflict;
if (dirmask)
/*
* Assume is_null for now, but if we have entries
* under the directory then when it is complete in
* write_completed_directory() it'll update this.
* Also, for D/F conflicts, we have to handle the
* directory first, then clear this bit and process
* the file to see how it is handled -- that occurs
* near the top of process_entry().
*/
mi->is_null = 1;
}
strmap_put(&opt->priv->paths, fullpath, mi);
result->string = fullpath;
result->util = mi;
}
static void add_pair(struct merge_options *opt,
struct name_entry *names,
const char *pathname,
unsigned side,
unsigned is_add /* if false, is_delete */,
unsigned match_mask,
unsigned dir_rename_mask)
{
struct diff_filespec *one, *two;
struct rename_info *renames = &opt->priv->renames;
int names_idx = is_add ? side : 0;
if (!is_add) {
unsigned content_relevant = (match_mask == 0);
unsigned location_relevant = (dir_rename_mask == 0x07);
if (content_relevant || location_relevant)
strset_add(&renames->relevant_sources[side], pathname);
}
one = alloc_filespec(pathname);
two = alloc_filespec(pathname);
fill_filespec(is_add ? two : one,
&names[names_idx].oid, 1, names[names_idx].mode);
diff_queue(&renames->pairs[side], one, two);
}
static void collect_rename_info(struct merge_options *opt,
struct name_entry *names,
const char *dirname,
const char *fullname,
unsigned filemask,
unsigned dirmask,
unsigned match_mask)
{
struct rename_info *renames = &opt->priv->renames;
unsigned side;
/*
* Update dir_rename_mask (determines ignore-rename-source validity)
*
* dir_rename_mask helps us keep track of when directory rename
* detection may be relevant. Basically, whenver a directory is
* removed on one side of history, and a file is added to that
* directory on the other side of history, directory rename
* detection is relevant (meaning we have to detect renames for all
* files within that directory to deduce where the directory
* moved). Also, whenever a directory needs directory rename
* detection, due to the "majority rules" choice for where to move
* it (see t6423 testcase 1f), we also need to detect renames for
* all files within subdirectories of that directory as well.
*
* Here we haven't looked at files within the directory yet, we are
* just looking at the directory itself. So, if we aren't yet in
* a case where a parent directory needed directory rename detection
* (i.e. dir_rename_mask != 0x07), and if the directory was removed
* on one side of history, record the mask of the other side of
* history in dir_rename_mask.
*/
if (renames->dir_rename_mask != 0x07 &&
(dirmask == 3 || dirmask == 5)) {
/* simple sanity check */
assert(renames->dir_rename_mask == 0 ||
renames->dir_rename_mask == (dirmask & ~1));
/* update dir_rename_mask; have it record mask of new side */
renames->dir_rename_mask = (dirmask & ~1);
}
/* Update dirs_removed, as needed */
if (dirmask == 1 || dirmask == 3 || dirmask == 5) {
/* absent_mask = 0x07 - dirmask; sides = absent_mask/2 */
unsigned sides = (0x07 - dirmask)/2;
if (sides & 1)
strset_add(&renames->dirs_removed[1], fullname);
if (sides & 2)
strset_add(&renames->dirs_removed[2], fullname);
}
if (filemask == 0 || filemask == 7)
return;
for (side = MERGE_SIDE1; side <= MERGE_SIDE2; ++side) {
unsigned side_mask = (1 << side);
/* Check for deletion on side */
if ((filemask & 1) && !(filemask & side_mask))
add_pair(opt, names, fullname, side, 0 /* delete */,
match_mask & filemask,
renames->dir_rename_mask);
/* Check for addition on side */
if (!(filemask & 1) && (filemask & side_mask))
add_pair(opt, names, fullname, side, 1 /* add */,
match_mask & filemask,
renames->dir_rename_mask);
}
}
static int collect_merge_info_callback(int n,
unsigned long mask,
unsigned long dirmask,
struct name_entry *names,
struct traverse_info *info)
{
/*
* n is 3. Always.
* common ancestor (mbase) has mask 1, and stored in index 0 of names
* head of side 1 (side1) has mask 2, and stored in index 1 of names
* head of side 2 (side2) has mask 4, and stored in index 2 of names
*/
struct merge_options *opt = info->data;
struct merge_options_internal *opti = opt->priv;
struct rename_info *renames = &opt->priv->renames;
struct string_list_item pi; /* Path Info */
struct conflict_info *ci; /* typed alias to pi.util (which is void*) */
struct name_entry *p;
size_t len;
char *fullpath;
const char *dirname = opti->current_dir_name;
unsigned prev_dir_rename_mask = renames->dir_rename_mask;
unsigned filemask = mask & ~dirmask;
unsigned match_mask = 0; /* will be updated below */
unsigned mbase_null = !(mask & 1);
unsigned side1_null = !(mask & 2);
unsigned side2_null = !(mask & 4);
unsigned side1_matches_mbase = (!side1_null && !mbase_null &&
names[0].mode == names[1].mode &&
oideq(&names[0].oid, &names[1].oid));
unsigned side2_matches_mbase = (!side2_null && !mbase_null &&
names[0].mode == names[2].mode &&
oideq(&names[0].oid, &names[2].oid));
unsigned sides_match = (!side1_null && !side2_null &&
names[1].mode == names[2].mode &&
oideq(&names[1].oid, &names[2].oid));
/*
* Note: When a path is a file on one side of history and a directory
* in another, we have a directory/file conflict. In such cases, if
* the conflict doesn't resolve from renames and deletions, then we
* always leave directories where they are and move files out of the
* way. Thus, while struct conflict_info has a df_conflict field to
* track such conflicts, we ignore that field for any directories at
* a path and only pay attention to it for files at the given path.
* The fact that we leave directories were they are also means that
* we do not need to worry about getting additional df_conflict
* information propagated from parent directories down to children
* (unlike, say traverse_trees_recursive() in unpack-trees.c, which
* sets a newinfo.df_conflicts field specifically to propagate it).
*/
unsigned df_conflict = (filemask != 0) && (dirmask != 0);
/* n = 3 is a fundamental assumption. */
if (n != 3)
BUG("Called collect_merge_info_callback wrong");
/*
* A bunch of sanity checks verifying that traverse_trees() calls
* us the way I expect. Could just remove these at some point,
* though maybe they are helpful to future code readers.
*/
assert(mbase_null == is_null_oid(&names[0].oid));
assert(side1_null == is_null_oid(&names[1].oid));
assert(side2_null == is_null_oid(&names[2].oid));
assert(!mbase_null || !side1_null || !side2_null);
assert(mask > 0 && mask < 8);
/* Determine match_mask */
if (side1_matches_mbase)
match_mask = (side2_matches_mbase ? 7 : 3);
else if (side2_matches_mbase)
match_mask = 5;
else if (sides_match)
match_mask = 6;
/*
* Get the name of the relevant filepath, which we'll pass to
* setup_path_info() for tracking.
*/
p = names;
while (!p->mode)
p++;
len = traverse_path_len(info, p->pathlen);
/* +1 in both of the following lines to include the NUL byte */
fullpath = xmalloc(len + 1);
make_traverse_path(fullpath, len + 1, info, p->path, p->pathlen);
/*
* If mbase, side1, and side2 all match, we can resolve early. Even
* if these are trees, there will be no renames or anything
* underneath.
*/
if (side1_matches_mbase && side2_matches_mbase) {
/* mbase, side1, & side2 all match; use mbase as resolution */
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
names, names+0, mbase_null, 0,
filemask, dirmask, 1);
return mask;
}
/*
* Gather additional information used in rename detection.
*/
collect_rename_info(opt, names, dirname, fullpath,
filemask, dirmask, match_mask);
/*
* Record information about the path so we can resolve later in
* process_entries.
*/
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
names, NULL, 0, df_conflict, filemask, dirmask, 0);
ci = pi.util;
VERIFY_CI(ci);
ci->match_mask = match_mask;
/* If dirmask, recurse into subdirectories */
if (dirmask) {
struct traverse_info newinfo;
struct tree_desc t[3];
void *buf[3] = {NULL, NULL, NULL};
const char *original_dir_name;
int i, ret;
ci->match_mask &= filemask;
newinfo = *info;
newinfo.prev = info;
newinfo.name = p->path;
newinfo.namelen = p->pathlen;
newinfo.pathlen = st_add3(newinfo.pathlen, p->pathlen, 1);
/*
* If this directory we are about to recurse into cared about
* its parent directory (the current directory) having a D/F
* conflict, then we'd propagate the masks in this way:
* newinfo.df_conflicts |= (mask & ~dirmask);
* But we don't worry about propagating D/F conflicts. (See
* comment near setting of local df_conflict variable near
* the beginning of this function).
*/
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
if (i == 1 && side1_matches_mbase)
t[1] = t[0];
else if (i == 2 && side2_matches_mbase)
t[2] = t[0];
else if (i == 2 && sides_match)
t[2] = t[1];
else {
const struct object_id *oid = NULL;
if (dirmask & 1)
oid = &names[i].oid;
buf[i] = fill_tree_descriptor(opt->repo,
t + i, oid);
}
dirmask >>= 1;
}
original_dir_name = opti->current_dir_name;
opti->current_dir_name = pi.string;
if (renames->dir_rename_mask == 0 ||
renames->dir_rename_mask == 0x07)
ret = traverse_trees(NULL, 3, t, &newinfo);
else
ret = traverse_trees_wrapper(NULL, 3, t, &newinfo);
opti->current_dir_name = original_dir_name;
renames->dir_rename_mask = prev_dir_rename_mask;
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++)
free(buf[i]);
if (ret < 0)
return -1;
}
return mask;
}
static int collect_merge_info(struct merge_options *opt,
struct tree *merge_base,
struct tree *side1,
struct tree *side2)
{
int ret;
struct tree_desc t[3];
struct traverse_info info;
opt->priv->toplevel_dir = "";
opt->priv->current_dir_name = opt->priv->toplevel_dir;
setup_traverse_info(&info, opt->priv->toplevel_dir);
info.fn = collect_merge_info_callback;
info.data = opt;
info.show_all_errors = 1;
parse_tree(merge_base);
parse_tree(side1);
parse_tree(side2);
init_tree_desc(t + 0, merge_base->buffer, merge_base->size);
init_tree_desc(t + 1, side1->buffer, side1->size);
init_tree_desc(t + 2, side2->buffer, side2->size);
trace2_region_enter("merge", "traverse_trees", opt->repo);
ret = traverse_trees(NULL, 3, t, &info);
trace2_region_leave("merge", "traverse_trees", opt->repo);
return ret;
}
/*** Function Grouping: functions related to threeway content merges ***/
static int find_first_merges(struct repository *repo,
const char *path,
struct commit *a,
struct commit *b,
struct object_array *result)
{
int i, j;
struct object_array merges = OBJECT_ARRAY_INIT;
struct commit *commit;
int contains_another;
char merged_revision[GIT_MAX_HEXSZ + 2];
const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
"--all", merged_revision, NULL };
struct rev_info revs;
struct setup_revision_opt rev_opts;
memset(result, 0, sizeof(struct object_array));
memset(&rev_opts, 0, sizeof(rev_opts));
/* get all revisions that merge commit a */
xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
oid_to_hex(&a->object.oid));
repo_init_revisions(repo, &revs, NULL);
rev_opts.submodule = path;
/* FIXME: can't handle linked worktrees in submodules yet */
revs.single_worktree = path != NULL;
setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
/* save all revisions from the above list that contain b */
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
while ((commit = get_revision(&revs)) != NULL) {
struct object *o = &(commit->object);
if (in_merge_bases(b, commit))
add_object_array(o, NULL, &merges);
}
reset_revision_walk();
/* Now we've got all merges that contain a and b. Prune all
* merges that contain another found merge and save them in
* result.
*/
for (i = 0; i < merges.nr; i++) {
struct commit *m1 = (struct commit *) merges.objects[i].item;
contains_another = 0;
for (j = 0; j < merges.nr; j++) {
struct commit *m2 = (struct commit *) merges.objects[j].item;
if (i != j && in_merge_bases(m2, m1)) {
contains_another = 1;
break;
}
}
if (!contains_another)
add_object_array(merges.objects[i].item, NULL, result);
}
object_array_clear(&merges);
return result->nr;
}
static int merge_submodule(struct merge_options *opt,
const char *path,
const struct object_id *o,
const struct object_id *a,
const struct object_id *b,
struct object_id *result)
{
struct commit *commit_o, *commit_a, *commit_b;
int parent_count;
struct object_array merges;
struct strbuf sb = STRBUF_INIT;
int i;
int search = !opt->priv->call_depth;
/* store fallback answer in result in case we fail */
oidcpy(result, opt->priv->call_depth ? o : a);
/* we can not handle deletion conflicts */
if (is_null_oid(o))
return 0;
if (is_null_oid(a))
return 0;
if (is_null_oid(b))
return 0;
if (add_submodule_odb(path)) {
path_msg(opt, path, 0,
_("Failed to merge submodule %s (not checked out)"),
path);
return 0;
}
if (!(commit_o = lookup_commit_reference(opt->repo, o)) ||
!(commit_a = lookup_commit_reference(opt->repo, a)) ||
!(commit_b = lookup_commit_reference(opt->repo, b))) {
path_msg(opt, path, 0,
_("Failed to merge submodule %s (commits not present)"),
path);
return 0;
}
/* check whether both changes are forward */
if (!in_merge_bases(commit_o, commit_a) ||
!in_merge_bases(commit_o, commit_b)) {
path_msg(opt, path, 0,
_("Failed to merge submodule %s "
"(commits don't follow merge-base)"),
path);
return 0;
}
/* Case #1: a is contained in b or vice versa */
if (in_merge_bases(commit_a, commit_b)) {
oidcpy(result, b);
path_msg(opt, path, 1,
_("Note: Fast-forwarding submodule %s to %s"),
path, oid_to_hex(b));
return 1;
}
if (in_merge_bases(commit_b, commit_a)) {
oidcpy(result, a);
path_msg(opt, path, 1,
_("Note: Fast-forwarding submodule %s to %s"),
path, oid_to_hex(a));
return 1;
}
/*
* Case #2: There are one or more merges that contain a and b in
* the submodule. If there is only one, then present it as a
* suggestion to the user, but leave it marked unmerged so the
* user needs to confirm the resolution.
*/
/* Skip the search if makes no sense to the calling context. */
if (!search)
return 0;
/* find commit which merges them */
parent_count = find_first_merges(opt->repo, path, commit_a, commit_b,
&merges);
switch (parent_count) {
case 0:
path_msg(opt, path, 0, _("Failed to merge submodule %s"), path);
break;
case 1:
format_commit(&sb, 4,
(struct commit *)merges.objects[0].item);
path_msg(opt, path, 0,
_("Failed to merge submodule %s, but a possible merge "
"resolution exists:\n%s\n"),
path, sb.buf);
path_msg(opt, path, 1,
_("If this is correct simply add it to the index "
"for example\n"
"by using:\n\n"
" git update-index --cacheinfo 160000 %s \"%s\"\n\n"
"which will accept this suggestion.\n"),
oid_to_hex(&merges.objects[0].item->oid), path);
strbuf_release(&sb);
break;
default:
for (i = 0; i < merges.nr; i++)
format_commit(&sb, 4,
(struct commit *)merges.objects[i].item);
path_msg(opt, path, 0,
_("Failed to merge submodule %s, but multiple "
"possible merges exist:\n%s"), path, sb.buf);
strbuf_release(&sb);
}
object_array_clear(&merges);
return 0;
}
static int merge_3way(struct merge_options *opt,
const char *path,
const struct object_id *o,
const struct object_id *a,
const struct object_id *b,
const char *pathnames[3],
const int extra_marker_size,
mmbuffer_t *result_buf)
{
mmfile_t orig, src1, src2;
struct ll_merge_options ll_opts = {0};
char *base, *name1, *name2;
int merge_status;
ll_opts.renormalize = opt->renormalize;
ll_opts.extra_marker_size = extra_marker_size;
ll_opts.xdl_opts = opt->xdl_opts;
if (opt->priv->call_depth) {
ll_opts.virtual_ancestor = 1;
ll_opts.variant = 0;
} else {
switch (opt->recursive_variant) {
case MERGE_VARIANT_OURS:
ll_opts.variant = XDL_MERGE_FAVOR_OURS;
break;
case MERGE_VARIANT_THEIRS:
ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
break;
default:
ll_opts.variant = 0;
break;
}
}
assert(pathnames[0] && pathnames[1] && pathnames[2] && opt->ancestor);
if (pathnames[0] == pathnames[1] && pathnames[1] == pathnames[2]) {
base = mkpathdup("%s", opt->ancestor);
name1 = mkpathdup("%s", opt->branch1);
name2 = mkpathdup("%s", opt->branch2);
} else {
base = mkpathdup("%s:%s", opt->ancestor, pathnames[0]);
name1 = mkpathdup("%s:%s", opt->branch1, pathnames[1]);
name2 = mkpathdup("%s:%s", opt->branch2, pathnames[2]);
}
read_mmblob(&orig, o);
read_mmblob(&src1, a);
read_mmblob(&src2, b);
merge_status = ll_merge(result_buf, path, &orig, base,
&src1, name1, &src2, name2,
opt->repo->index, &ll_opts);
free(base);
free(name1);
free(name2);
free(orig.ptr);
free(src1.ptr);
free(src2.ptr);
return merge_status;
}
static int handle_content_merge(struct merge_options *opt,
const char *path,
const struct version_info *o,
const struct version_info *a,
const struct version_info *b,
const char *pathnames[3],
const int extra_marker_size,
struct version_info *result)
{
/*
* path is the target location where we want to put the file, and
* is used to determine any normalization rules in ll_merge.
*
* The normal case is that path and all entries in pathnames are
* identical, though renames can affect which path we got one of
* the three blobs to merge on various sides of history.
*
* extra_marker_size is the amount to extend conflict markers in
* ll_merge; this is neeed if we have content merges of content
* merges, which happens for example with rename/rename(2to1) and
* rename/add conflicts.
*/
unsigned clean = 1;
/*
* handle_content_merge() needs both files to be of the same type, i.e.
* both files OR both submodules OR both symlinks. Conflicting types
* needs to be handled elsewhere.
*/
assert((S_IFMT & a->mode) == (S_IFMT & b->mode));
/* Merge modes */
if (a->mode == b->mode || a->mode == o->mode)
result->mode = b->mode;
else {
/* must be the 100644/100755 case */
assert(S_ISREG(a->mode));
result->mode = a->mode;
clean = (b->mode == o->mode);
/*
* FIXME: If opt->priv->call_depth && !clean, then we really
* should not make result->mode match either a->mode or
* b->mode; that causes t6036 "check conflicting mode for
* regular file" to fail. It would be best to use some other
* mode, but we'll confuse all kinds of stuff if we use one
* where S_ISREG(result->mode) isn't true, and if we use
* something like 0100666, then tree-walk.c's calls to
* canon_mode() will just normalize that to 100644 for us and
* thus not solve anything.
*
* Figure out if there's some kind of way we can work around
* this...
*/
}
/*
* Trivial oid merge.
*
* Note: While one might assume that the next four lines would
* be unnecessary due to the fact that match_mask is often
* setup and already handled, renames don't always take care
* of that.
*/
if (oideq(&a->oid, &b->oid) || oideq(&a->oid, &o->oid))
oidcpy(&result->oid, &b->oid);
else if (oideq(&b->oid, &o->oid))
oidcpy(&result->oid, &a->oid);
/* Remaining rules depend on file vs. submodule vs. symlink. */
else if (S_ISREG(a->mode)) {
mmbuffer_t result_buf;
int ret = 0, merge_status;
int two_way;
/*
* If 'o' is different type, treat it as null so we do a
* two-way merge.
*/
two_way = ((S_IFMT & o->mode) != (S_IFMT & a->mode));
merge_status = merge_3way(opt, path,
two_way ? &null_oid : &o->oid,
&a->oid, &b->oid,
pathnames, extra_marker_size,
&result_buf);
if ((merge_status < 0) || !result_buf.ptr)
ret = err(opt, _("Failed to execute internal merge"));
if (!ret &&
write_object_file(result_buf.ptr, result_buf.size,
blob_type, &result->oid))
ret = err(opt, _("Unable to add %s to database"),
path);
free(result_buf.ptr);
if (ret)
return -1;
clean &= (merge_status == 0);
path_msg(opt, path, 1, _("Auto-merging %s"), path);
} else if (S_ISGITLINK(a->mode)) {
int two_way = ((S_IFMT & o->mode) != (S_IFMT & a->mode));
clean = merge_submodule(opt, pathnames[0],
two_way ? &null_oid : &o->oid,
&a->oid, &b->oid, &result->oid);
if (opt->priv->call_depth && two_way && !clean) {
result->mode = o->mode;
oidcpy(&result->oid, &o->oid);
}
} else if (S_ISLNK(a->mode)) {
if (opt->priv->call_depth) {
clean = 0;
result->mode = o->mode;
oidcpy(&result->oid, &o->oid);
} else {
switch (opt->recursive_variant) {
case MERGE_VARIANT_NORMAL:
clean = 0;
oidcpy(&result->oid, &a->oid);
break;
case MERGE_VARIANT_OURS:
oidcpy(&result->oid, &a->oid);
break;
case MERGE_VARIANT_THEIRS:
oidcpy(&result->oid, &b->oid);
break;
}
}
} else
BUG("unsupported object type in the tree: %06o for %s",
a->mode, path);
return clean;
}
/*** Function Grouping: functions related to detect_and_process_renames(), ***
*** which are split into directory and regular rename detection sections. ***/
/*** Function Grouping: functions related to directory rename detection ***/
struct collision_info {
struct string_list source_files;
unsigned reported_already:1;
};
/*
* Return a new string that replaces the beginning portion (which matches
* rename_info->key), with rename_info->util.new_dir. In perl-speak:
* new_path_name = (old_path =~ s/rename_info->key/rename_info->value/);
* NOTE:
* Caller must ensure that old_path starts with rename_info->key + '/'.
*/
static char *apply_dir_rename(struct strmap_entry *rename_info,
const char *old_path)
{
struct strbuf new_path = STRBUF_INIT;
const char *old_dir = rename_info->key;
const char *new_dir = rename_info->value;
int oldlen, newlen, new_dir_len;
oldlen = strlen(old_dir);
if (*new_dir == '\0')
/*
* If someone renamed/merged a subdirectory into the root
* directory (e.g. 'some/subdir' -> ''), then we want to
* avoid returning
* '' + '/filename'
* as the rename; we need to make old_path + oldlen advance
* past the '/' character.
*/
oldlen++;
new_dir_len = strlen(new_dir);
newlen = new_dir_len + (strlen(old_path) - oldlen) + 1;
strbuf_grow(&new_path, newlen);
strbuf_add(&new_path, new_dir, new_dir_len);
strbuf_addstr(&new_path, &old_path[oldlen]);
return strbuf_detach(&new_path, NULL);
}
static int path_in_way(struct strmap *paths, const char *path, unsigned side_mask)
{
struct merged_info *mi = strmap_get(paths, path);
struct conflict_info *ci;
if (!mi)
return 0;
INITIALIZE_CI(ci, mi);
return mi->clean || (side_mask & (ci->filemask | ci->dirmask));
}
/*
* See if there is a directory rename for path, and if there are any file
* level conflicts on the given side for the renamed location. If there is
* a rename and there are no conflicts, return the new name. Otherwise,
* return NULL.
*/
static char *handle_path_level_conflicts(struct merge_options *opt,
const char *path,
unsigned side_index,
struct strmap_entry *rename_info,
struct strmap *collisions)
{
char *new_path = NULL;
struct collision_info *c_info;
int clean = 1;
struct strbuf collision_paths = STRBUF_INIT;
/*
* entry has the mapping of old directory name to new directory name
* that we want to apply to path.
*/
new_path = apply_dir_rename(rename_info, path);
if (!new_path)
BUG("Failed to apply directory rename!");
/*
* The caller needs to have ensured that it has pre-populated
* collisions with all paths that map to new_path. Do a quick check
* to ensure that's the case.
*/
c_info = strmap_get(collisions, new_path);
if (c_info == NULL)
BUG("c_info is NULL");
/*
* Check for one-sided add/add/.../add conflicts, i.e.
* where implicit renames from the other side doing
* directory rename(s) can affect this side of history
* to put multiple paths into the same location. Warn
* and bail on directory renames for such paths.
*/
if (c_info->reported_already) {
clean = 0;
} else if (path_in_way(&opt->priv->paths, new_path, 1 << side_index)) {
c_info->reported_already = 1;
strbuf_add_separated_string_list(&collision_paths, ", ",
&c_info->source_files);
path_msg(opt, new_path, 0,
_("CONFLICT (implicit dir rename): Existing file/dir "
"at %s in the way of implicit directory rename(s) "
"putting the following path(s) there: %s."),
new_path, collision_paths.buf);
clean = 0;
} else if (c_info->source_files.nr > 1) {
c_info->reported_already = 1;
strbuf_add_separated_string_list(&collision_paths, ", ",
&c_info->source_files);
path_msg(opt, new_path, 0,
_("CONFLICT (implicit dir rename): Cannot map more "
"than one path to %s; implicit directory renames "
"tried to put these paths there: %s"),
new_path, collision_paths.buf);
clean = 0;
}
/* Free memory we no longer need */
strbuf_release(&collision_paths);
if (!clean && new_path) {
free(new_path);
return NULL;
}
return new_path;
}
static void get_provisional_directory_renames(struct merge_options *opt,
unsigned side,
int *clean)
{
struct hashmap_iter iter;
struct strmap_entry *entry;
struct rename_info *renames = &opt->priv->renames;
/*
* Collapse
* dir_rename_count: old_directory -> {new_directory -> count}
* down to
* dir_renames: old_directory -> best_new_directory
* where best_new_directory is the one with the unique highest count.
*/
strmap_for_each_entry(&renames->dir_rename_count[side], &iter, entry) {
const char *source_dir = entry->key;
struct strintmap *counts = entry->value;
struct hashmap_iter count_iter;
struct strmap_entry *count_entry;
int max = 0;
int bad_max = 0;
const char *best = NULL;
strintmap_for_each_entry(counts, &count_iter, count_entry) {
const char *target_dir = count_entry->key;
intptr_t count = (intptr_t)count_entry->value;
if (count == max)
bad_max = max;
else if (count > max) {
max = count;
best = target_dir;
}
}
if (bad_max == max) {
path_msg(opt, source_dir, 0,
_("CONFLICT (directory rename split): "
"Unclear where to rename %s to; it was "
"renamed to multiple other directories, with "
"no destination getting a majority of the "
"files."),
source_dir);
/*
* We should mark this as unclean IF something attempts
* to use this rename. We do not yet have the logic
* in place to detect if this directory rename is being
* used, and optimizations that reduce the number of
* renames cause this to falsely trigger. For now,
* just disable it, causing t6423 testcase 2a to break.
* We'll later fix the detection, and when we do we
* will re-enable setting *clean to 0 (and thereby fix
* t6423 testcase 2a).
*/
/* *clean = 0; */
} else {
strmap_put(&renames->dir_renames[side],
source_dir, (void*)best);
}
}
}
static void handle_directory_level_conflicts(struct merge_options *opt)
{
struct hashmap_iter iter;
struct strmap_entry *entry;
struct string_list duplicated = STRING_LIST_INIT_NODUP;
struct rename_info *renames = &opt->priv->renames;
struct strmap *side1_dir_renames = &renames->dir_renames[MERGE_SIDE1];
struct strmap *side2_dir_renames = &renames->dir_renames[MERGE_SIDE2];
int i;
strmap_for_each_entry(side1_dir_renames, &iter, entry) {
if (strmap_contains(side2_dir_renames, entry->key))
string_list_append(&duplicated, entry->key);
}
for (i = 0; i < duplicated.nr; i++) {
strmap_remove(side1_dir_renames, duplicated.items[i].string, 0);
strmap_remove(side2_dir_renames, duplicated.items[i].string, 0);
}
string_list_clear(&duplicated, 0);
}
static struct strmap_entry *check_dir_renamed(const char *path,
struct strmap *dir_renames)
{
char *temp = xstrdup(path);
char *end;
struct strmap_entry *e = NULL;
while ((end = strrchr(temp, '/'))) {
*end = '\0';
e = strmap_get_entry(dir_renames, temp);
if (e)
break;
}
free(temp);
return e;
}
static void compute_collisions(struct strmap *collisions,
struct strmap *dir_renames,
struct diff_queue_struct *pairs)
{
int i;
strmap_init_with_options(collisions, NULL, 0);
if (strmap_empty(dir_renames))
return;
/*
* Multiple files can be mapped to the same path due to directory
* renames done by the other side of history. Since that other
* side of history could have merged multiple directories into one,
* if our side of history added the same file basename to each of
* those directories, then all N of them would get implicitly
* renamed by the directory rename detection into the same path,
* and we'd get an add/add/.../add conflict, and all those adds
* from *this* side of history. This is not representable in the
* index, and users aren't going to easily be able to make sense of
* it. So we need to provide a good warning about what's
* happening, and fall back to no-directory-rename detection
* behavior for those paths.
*
* See testcases 9e and all of section 5 from t6043 for examples.
*/
for (i = 0; i < pairs->nr; ++i) {
struct strmap_entry *rename_info;
struct collision_info *collision_info;
char *new_path;
struct diff_filepair *pair = pairs->queue[i];
if (pair->status != 'A' && pair->status != 'R')
continue;
rename_info = check_dir_renamed(pair->two->path, dir_renames);
if (!rename_info)
continue;
new_path = apply_dir_rename(rename_info, pair->two->path);
assert(new_path);
collision_info = strmap_get(collisions, new_path);
if (collision_info) {
free(new_path);
} else {
CALLOC_ARRAY(collision_info, 1);
string_list_init(&collision_info->source_files, 0);
strmap_put(collisions, new_path, collision_info);
}
string_list_insert(&collision_info->source_files,
pair->two->path);
}
}
static char *check_for_directory_rename(struct merge_options *opt,
const char *path,
unsigned side_index,
struct strmap *dir_renames,
struct strmap *dir_rename_exclusions,
struct strmap *collisions,
int *clean_merge)
{
char *new_path = NULL;
struct strmap_entry *rename_info;
struct strmap_entry *otherinfo = NULL;
const char *new_dir;
if (strmap_empty(dir_renames))
return new_path;
rename_info = check_dir_renamed(path, dir_renames);
if (!rename_info)
return new_path;
/* old_dir = rename_info->key; */
new_dir = rename_info->value;
/*
* This next part is a little weird. We do not want to do an
* implicit rename into a directory we renamed on our side, because
* that will result in a spurious rename/rename(1to2) conflict. An
* example:
* Base commit: dumbdir/afile, otherdir/bfile
* Side 1: smrtdir/afile, otherdir/bfile
* Side 2: dumbdir/afile, dumbdir/bfile
* Here, while working on Side 1, we could notice that otherdir was
* renamed/merged to dumbdir, and change the diff_filepair for
* otherdir/bfile into a rename into dumbdir/bfile. However, Side
* 2 will notice the rename from dumbdir to smrtdir, and do the
* transitive rename to move it from dumbdir/bfile to
* smrtdir/bfile. That gives us bfile in dumbdir vs being in
* smrtdir, a rename/rename(1to2) conflict. We really just want
* the file to end up in smrtdir. And the way to achieve that is
* to not let Side1 do the rename to dumbdir, since we know that is
* the source of one of our directory renames.
*
* That's why otherinfo and dir_rename_exclusions is here.
*
* As it turns out, this also prevents N-way transient rename
* confusion; See testcases 9c and 9d of t6043.
*/
otherinfo = strmap_get_entry(dir_rename_exclusions, new_dir);
if (otherinfo) {
path_msg(opt, rename_info->key, 1,
_("WARNING: Avoiding applying %s -> %s rename "
"to %s, because %s itself was renamed."),
rename_info->key, new_dir, path, new_dir);
return NULL;
}
new_path = handle_path_level_conflicts(opt, path, side_index,
rename_info, collisions);
*clean_merge &= (new_path != NULL);
return new_path;
}
static void apply_directory_rename_modifications(struct merge_options *opt,
struct diff_filepair *pair,
char *new_path)
{
/*
* The basic idea is to get the conflict_info from opt->priv->paths
* at old path, and insert it into new_path; basically just this:
* ci = strmap_get(&opt->priv->paths, old_path);
* strmap_remove(&opt->priv->paths, old_path, 0);
* strmap_put(&opt->priv->paths, new_path, ci);
* However, there are some factors complicating this:
* - opt->priv->paths may already have an entry at new_path
* - Each ci tracks its containing directory, so we need to
* update that
* - If another ci has the same containing directory, then
* the two char*'s MUST point to the same location. See the
* comment in struct merged_info. strcmp equality is not
* enough; we need pointer equality.
* - opt->priv->paths must hold the parent directories of any
* entries that are added. So, if this directory rename
* causes entirely new directories, we must recursively add
* parent directories.
* - For each parent directory added to opt->priv->paths, we
* also need to get its parent directory stored in its
* conflict_info->merged.directory_name with all the same
* requirements about pointer equality.
*/
struct string_list dirs_to_insert = STRING_LIST_INIT_NODUP;
struct conflict_info *ci, *new_ci;
struct strmap_entry *entry;
const char *branch_with_new_path, *branch_with_dir_rename;
const char *old_path = pair->two->path;
const char *parent_name;
const char *cur_path;
int i, len;
entry = strmap_get_entry(&opt->priv->paths, old_path);
old_path = entry->key;
ci = entry->value;
VERIFY_CI(ci);
/* Find parent directories missing from opt->priv->paths */
cur_path = new_path;
while (1) {
/* Find the parent directory of cur_path */
char *last_slash = strrchr(cur_path, '/');
if (last_slash) {
parent_name = xstrndup(cur_path, last_slash - cur_path);
} else {
parent_name = opt->priv->toplevel_dir;
break;
}
/* Look it up in opt->priv->paths */
entry = strmap_get_entry(&opt->priv->paths, parent_name);
if (entry) {
free((char*)parent_name);
parent_name = entry->key; /* reuse known pointer */
break;
}
/* Record this is one of the directories we need to insert */
string_list_append(&dirs_to_insert, parent_name);
cur_path = parent_name;
}
/* Traverse dirs_to_insert and insert them into opt->priv->paths */
for (i = dirs_to_insert.nr-1; i >= 0; --i) {
struct conflict_info *dir_ci;
char *cur_dir = dirs_to_insert.items[i].string;
CALLOC_ARRAY(dir_ci, 1);
dir_ci->merged.directory_name = parent_name;
len = strlen(parent_name);
/* len+1 because of trailing '/' character */
dir_ci->merged.basename_offset = (len > 0 ? len+1 : len);
dir_ci->dirmask = ci->filemask;
strmap_put(&opt->priv->paths, cur_dir, dir_ci);
parent_name = cur_dir;
}
/*
* We are removing old_path from opt->priv->paths. old_path also will
* eventually need to be freed, but it may still be used by e.g.
* ci->pathnames. So, store it in another string-list for now.
*/
string_list_append(&opt->priv->paths_to_free, old_path);
assert(ci->filemask == 2 || ci->filemask == 4);
assert(ci->dirmask == 0);
strmap_remove(&opt->priv->paths, old_path, 0);
branch_with_new_path = (ci->filemask == 2) ? opt->branch1 : opt->branch2;
branch_with_dir_rename = (ci->filemask == 2) ? opt->branch2 : opt->branch1;
/* Now, finally update ci and stick it into opt->priv->paths */
ci->merged.directory_name = parent_name;
len = strlen(parent_name);
ci->merged.basename_offset = (len > 0 ? len+1 : len);
new_ci = strmap_get(&opt->priv->paths, new_path);
if (!new_ci) {
/* Place ci back into opt->priv->paths, but at new_path */
strmap_put(&opt->priv->paths, new_path, ci);
} else {
int index;
/* A few sanity checks */
VERIFY_CI(new_ci);
assert(ci->filemask == 2 || ci->filemask == 4);
assert((new_ci->filemask & ci->filemask) == 0);
assert(!new_ci->merged.clean);
/* Copy stuff from ci into new_ci */
new_ci->filemask |= ci->filemask;
if (new_ci->dirmask)
new_ci->df_conflict = 1;
index = (ci->filemask >> 1);
new_ci->pathnames[index] = ci->pathnames[index];
new_ci->stages[index].mode = ci->stages[index].mode;
oidcpy(&new_ci->stages[index].oid, &ci->stages[index].oid);
free(ci);
ci = new_ci;
}
if (opt->detect_directory_renames == MERGE_DIRECTORY_RENAMES_TRUE) {
/* Notify user of updated path */
if (pair->status == 'A')
path_msg(opt, new_path, 1,
_("Path updated: %s added in %s inside a "
"directory that was renamed in %s; moving "
"it to %s."),
old_path, branch_with_new_path,
branch_with_dir_rename, new_path);
else
path_msg(opt, new_path, 1,
_("Path updated: %s renamed to %s in %s, "
"inside a directory that was renamed in %s; "
"moving it to %s."),
pair->one->path, old_path, branch_with_new_path,
branch_with_dir_rename, new_path);
} else {
/*
* opt->detect_directory_renames has the value
* MERGE_DIRECTORY_RENAMES_CONFLICT, so mark these as conflicts.
*/
ci->path_conflict = 1;
if (pair->status == 'A')
path_msg(opt, new_path, 0,
_("CONFLICT (file location): %s added in %s "
"inside a directory that was renamed in %s, "
"suggesting it should perhaps be moved to "
"%s."),
old_path, branch_with_new_path,
branch_with_dir_rename, new_path);
else
path_msg(opt, new_path, 0,
_("CONFLICT (file location): %s renamed to %s "
"in %s, inside a directory that was renamed "
"in %s, suggesting it should perhaps be "
"moved to %s."),
pair->one->path, old_path, branch_with_new_path,
branch_with_dir_rename, new_path);
}
/*
* Finally, record the new location.
*/
pair->two->path = new_path;
}
/*** Function Grouping: functions related to regular rename detection ***/
static int process_renames(struct merge_options *opt,
struct diff_queue_struct *renames)
{
int clean_merge = 1, i;
for (i = 0; i < renames->nr; ++i) {
const char *oldpath = NULL, *newpath;
struct diff_filepair *pair = renames->queue[i];
struct conflict_info *oldinfo = NULL, *newinfo = NULL;
struct strmap_entry *old_ent, *new_ent;
unsigned int old_sidemask;
int target_index, other_source_index;
int source_deleted, collision, type_changed;
const char *rename_branch = NULL, *delete_branch = NULL;
old_ent = strmap_get_entry(&opt->priv->paths, pair->one->path);
new_ent = strmap_get_entry(&opt->priv->paths, pair->two->path);
if (old_ent) {
oldpath = old_ent->key;
oldinfo = old_ent->value;
}
newpath = pair->two->path;
if (new_ent) {
newpath = new_ent->key;
newinfo = new_ent->value;
}
/*
* If pair->one->path isn't in opt->priv->paths, that means
* that either directory rename detection removed that
* path, or a parent directory of oldpath was resolved and
* we don't even need the rename; in either case, we can
* skip it. If oldinfo->merged.clean, then the other side
* of history had no changes to oldpath and we don't need
* the rename and can skip it.
*/
if (!oldinfo || oldinfo->merged.clean)
continue;
/*
* diff_filepairs have copies of pathnames, thus we have to
* use standard 'strcmp()' (negated) instead of '=='.
*/
if (i + 1 < renames->nr &&
!strcmp(oldpath, renames->queue[i+1]->one->path)) {
/* Handle rename/rename(1to2) or rename/rename(1to1) */
const char *pathnames[3];
struct version_info merged;
struct conflict_info *base, *side1, *side2;
unsigned was_binary_blob = 0;
pathnames[0] = oldpath;
pathnames[1] = newpath;
pathnames[2] = renames->queue[i+1]->two->path;
base = strmap_get(&opt->priv->paths, pathnames[0]);
side1 = strmap_get(&opt->priv->paths, pathnames[1]);
side2 = strmap_get(&opt->priv->paths, pathnames[2]);
VERIFY_CI(base);
VERIFY_CI(side1);
VERIFY_CI(side2);
if (!strcmp(pathnames[1], pathnames[2])) {
/* Both sides renamed the same way */
assert(side1 == side2);
memcpy(&side1->stages[0], &base->stages[0],
sizeof(merged));
side1->filemask |= (1 << MERGE_BASE);
/* Mark base as resolved by removal */
base->merged.is_null = 1;
base->merged.clean = 1;
/* We handled both renames, i.e. i+1 handled */
i++;
/* Move to next rename */
continue;
}
/* This is a rename/rename(1to2) */
clean_merge = handle_content_merge(opt,
pair->one->path,
&base->stages[0],
&side1->stages[1],
&side2->stages[2],
pathnames,
1 + 2 * opt->priv->call_depth,
&merged);
if (!clean_merge &&
merged.mode == side1->stages[1].mode &&
oideq(&merged.oid, &side1->stages[1].oid))
was_binary_blob = 1;
memcpy(&side1->stages[1], &merged, sizeof(merged));
if (was_binary_blob) {
/*
* Getting here means we were attempting to
* merge a binary blob.
*
* Since we can't merge binaries,
* handle_content_merge() just takes one
* side. But we don't want to copy the
* contents of one side to both paths. We
* used the contents of side1 above for
* side1->stages, let's use the contents of
* side2 for side2->stages below.
*/
oidcpy(&merged.oid, &side2->stages[2].oid);
merged.mode = side2->stages[2].mode;
}
memcpy(&side2->stages[2], &merged, sizeof(merged));
side1->path_conflict = 1;
side2->path_conflict = 1;
/*
* TODO: For renames we normally remove the path at the
* old name. It would thus seem consistent to do the
* same for rename/rename(1to2) cases, but we haven't
* done so traditionally and a number of the regression
* tests now encode an expectation that the file is
* left there at stage 1. If we ever decide to change
* this, add the following two lines here:
* base->merged.is_null = 1;
* base->merged.clean = 1;
* and remove the setting of base->path_conflict to 1.
*/
base->path_conflict = 1;
path_msg(opt, oldpath, 0,
_("CONFLICT (rename/rename): %s renamed to "
"%s in %s and to %s in %s."),
pathnames[0],
pathnames[1], opt->branch1,
pathnames[2], opt->branch2);
i++; /* We handled both renames, i.e. i+1 handled */
continue;
}
VERIFY_CI(oldinfo);
VERIFY_CI(newinfo);
target_index = pair->score; /* from collect_renames() */
assert(target_index == 1 || target_index == 2);
other_source_index = 3 - target_index;
old_sidemask = (1 << other_source_index); /* 2 or 4 */
source_deleted = (oldinfo->filemask == 1);
collision = ((newinfo->filemask & old_sidemask) != 0);
type_changed = !source_deleted &&
(S_ISREG(oldinfo->stages[other_source_index].mode) !=
S_ISREG(newinfo->stages[target_index].mode));
if (type_changed && collision) {
/*
* special handling so later blocks can handle this...
*
* if type_changed && collision are both true, then this
* was really a double rename, but one side wasn't
* detected due to lack of break detection. I.e.
* something like
* orig: has normal file 'foo'
* side1: renames 'foo' to 'bar', adds 'foo' symlink
* side2: renames 'foo' to 'bar'
* In this case, the foo->bar rename on side1 won't be
* detected because the new symlink named 'foo' is
* there and we don't do break detection. But we detect
* this here because we don't want to merge the content
* of the foo symlink with the foo->bar file, so we
* have some logic to handle this special case. The
* easiest way to do that is make 'bar' on side1 not
* be considered a colliding file but the other part
* of a normal rename. If the file is very different,
* well we're going to get content merge conflicts
* anyway so it doesn't hurt. And if the colliding
* file also has a different type, that'll be handled
* by the content merge logic in process_entry() too.
*
* See also t6430, 'rename vs. rename/symlink'
*/
collision = 0;
}
if (source_deleted) {
if (target_index == 1) {
rename_branch = opt->branch1;
delete_branch = opt->branch2;
} else {
rename_branch = opt->branch2;
delete_branch = opt->branch1;
}
}
assert(source_deleted || oldinfo->filemask & old_sidemask);
/* Need to check for special types of rename conflicts... */
if (collision && !source_deleted) {
/* collision: rename/add or rename/rename(2to1) */
const char *pathnames[3];
struct version_info merged;
struct conflict_info *base, *side1, *side2;
unsigned clean;
pathnames[0] = oldpath;
pathnames[other_source_index] = oldpath;
pathnames[target_index] = newpath;
base = strmap_get(&opt->priv->paths, pathnames[0]);
side1 = strmap_get(&opt->priv->paths, pathnames[1]);
side2 = strmap_get(&opt->priv->paths, pathnames[2]);
VERIFY_CI(base);
VERIFY_CI(side1);
VERIFY_CI(side2);
clean = handle_content_merge(opt, pair->one->path,
&base->stages[0],
&side1->stages[1],
&side2->stages[2],
pathnames,
1 + 2 * opt->priv->call_depth,
&merged);
memcpy(&newinfo->stages[target_index], &merged,
sizeof(merged));
if (!clean) {
path_msg(opt, newpath, 0,
_("CONFLICT (rename involved in "
"collision): rename of %s -> %s has "
"content conflicts AND collides "
"with another path; this may result "
"in nested conflict markers."),
oldpath, newpath);
}
} else if (collision && source_deleted) {
/*
* rename/add/delete or rename/rename(2to1)/delete:
* since oldpath was deleted on the side that didn't
* do the rename, there's not much of a content merge
* we can do for the rename. oldinfo->merged.is_null
* was already set, so we just leave things as-is so
* they look like an add/add conflict.
*/
newinfo->path_conflict = 1;
path_msg(opt, newpath, 0,
_("CONFLICT (rename/delete): %s renamed "
"to %s in %s, but deleted in %s."),
oldpath, newpath, rename_branch, delete_branch);
} else {
/*
* a few different cases...start by copying the
* existing stage(s) from oldinfo over the newinfo
* and update the pathname(s).
*/
memcpy(&newinfo->stages[0], &oldinfo->stages[0],
sizeof(newinfo->stages[0]));
newinfo->filemask |= (1 << MERGE_BASE);
newinfo->pathnames[0] = oldpath;
if (type_changed) {
/* rename vs. typechange */
/* Mark the original as resolved by removal */
memcpy(&oldinfo->stages[0].oid, &null_oid,
sizeof(oldinfo->stages[0].oid));
oldinfo->stages[0].mode = 0;
oldinfo->filemask &= 0x06;
} else if (source_deleted) {
/* rename/delete */
newinfo->path_conflict = 1;
path_msg(opt, newpath, 0,
_("CONFLICT (rename/delete): %s renamed"
" to %s in %s, but deleted in %s."),
oldpath, newpath,
rename_branch, delete_branch);
} else {
/* normal rename */
memcpy(&newinfo->stages[other_source_index],
&oldinfo->stages[other_source_index],
sizeof(newinfo->stages[0]));
newinfo->filemask |= (1 << other_source_index);
newinfo->pathnames[other_source_index] = oldpath;
}
}
if (!type_changed) {
/* Mark the original as resolved by removal */
oldinfo->merged.is_null = 1;
oldinfo->merged.clean = 1;
}
}
return clean_merge;
}
static inline int possible_side_renames(struct rename_info *renames,
unsigned side_index)
{
return renames->pairs[side_index].nr > 0 &&
!strset_empty(&renames->relevant_sources[side_index]);
}
static inline int possible_renames(struct rename_info *renames)
{
return possible_side_renames(renames, 1) ||
possible_side_renames(renames, 2);
}
static void resolve_diffpair_statuses(struct diff_queue_struct *q)
{
/*
* A simplified version of diff_resolve_rename_copy(); would probably
* just use that function but it's static...
*/
int i;
struct diff_filepair *p;
for (i = 0; i < q->nr; ++i) {
p = q->queue[i];
p->status = 0; /* undecided */
if (!DIFF_FILE_VALID(p->one))
p->status = DIFF_STATUS_ADDED;
else if (!DIFF_FILE_VALID(p->two))
p->status = DIFF_STATUS_DELETED;
else if (DIFF_PAIR_RENAME(p))
p->status = DIFF_STATUS_RENAMED;
}
}
static int compare_pairs(const void *a_, const void *b_)
{
const struct diff_filepair *a = *((const struct diff_filepair **)a_);
const struct diff_filepair *b = *((const struct diff_filepair **)b_);
return strcmp(a->one->path, b->one->path);
}
/* Call diffcore_rename() to compute which files have changed on given side */
static void detect_regular_renames(struct merge_options *opt,
unsigned side_index)
{
struct diff_options diff_opts;
struct rename_info *renames = &opt->priv->renames;
if (!possible_side_renames(renames, side_index)) {
/*
* No rename detection needed for this side, but we still need
* to make sure 'adds' are marked correctly in case the other
* side had directory renames.
*/
resolve_diffpair_statuses(&renames->pairs[side_index]);
return;
}
repo_diff_setup(opt->repo, &diff_opts);
diff_opts.flags.recursive = 1;
diff_opts.flags.rename_empty = 0;
diff_opts.detect_rename = DIFF_DETECT_RENAME;
diff_opts.rename_limit = opt->rename_limit;
if (opt->rename_limit <= 0)
diff_opts.rename_limit = 1000;
diff_opts.rename_score = opt->rename_score;
diff_opts.show_rename_progress = opt->show_rename_progress;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&diff_opts);
diff_queued_diff = renames->pairs[side_index];
trace2_region_enter("diff", "diffcore_rename", opt->repo);
diffcore_rename_extended(&diff_opts,
&renames->relevant_sources[side_index],
&renames->dirs_removed[side_index],
&renames->dir_rename_count[side_index]);
trace2_region_leave("diff", "diffcore_rename", opt->repo);
resolve_diffpair_statuses(&diff_queued_diff);
if (diff_opts.needed_rename_limit > renames->needed_limit)
renames->needed_limit = diff_opts.needed_rename_limit;
renames->pairs[side_index] = diff_queued_diff;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_queued_diff.nr = 0;
diff_queued_diff.queue = NULL;
diff_flush(&diff_opts);
}
/*
* Get information of all renames which occurred in 'side_pairs', discarding
* non-renames.
*/
static int collect_renames(struct merge_options *opt,
struct diff_queue_struct *result,
unsigned side_index,
struct strmap *dir_renames_for_side,
struct strmap *rename_exclusions)
{
int i, clean = 1;
struct strmap collisions;
struct diff_queue_struct *side_pairs;
struct hashmap_iter iter;
struct strmap_entry *entry;
struct rename_info *renames = &opt->priv->renames;
side_pairs = &renames->pairs[side_index];
compute_collisions(&collisions, dir_renames_for_side, side_pairs);
for (i = 0; i < side_pairs->nr; ++i) {
struct diff_filepair *p = side_pairs->queue[i];
char *new_path; /* non-NULL only with directory renames */
if (p->status != 'A' && p->status != 'R') {
diff_free_filepair(p);
continue;
}
new_path = check_for_directory_rename(opt, p->two->path,
side_index,
dir_renames_for_side,
rename_exclusions,
&collisions,
&clean);
if (p->status != 'R' && !new_path) {
diff_free_filepair(p);
continue;
}
if (new_path)
apply_directory_rename_modifications(opt, p, new_path);
/*
* p->score comes back from diffcore_rename_extended() with
* the similarity of the renamed file. The similarity is
* was used to determine that the two files were related
* and are a rename, which we have already used, but beyond
* that we have no use for the similarity. So p->score is
* now irrelevant. However, process_renames() will need to
* know which side of the merge this rename was associated
* with, so overwrite p->score with that value.
*/
p->score = side_index;
result->queue[result->nr++] = p;
}
/* Free each value in the collisions map */
strmap_for_each_entry(&collisions, &iter, entry) {
struct collision_info *info = entry->value;
string_list_clear(&info->source_files, 0);
}
/*
* In compute_collisions(), we set collisions.strdup_strings to 0
* so that we wouldn't have to make another copy of the new_path
* allocated by apply_dir_rename(). But now that we've used them
* and have no other references to these strings, it is time to
* deallocate them.
*/
free_strmap_strings(&collisions);
strmap_clear(&collisions, 1);
return clean;
}
static int detect_and_process_renames(struct merge_options *opt,
struct tree *merge_base,
struct tree *side1,
struct tree *side2)
{
struct diff_queue_struct combined;
struct rename_info *renames = &opt->priv->renames;
int need_dir_renames, s, clean = 1;
memset(&combined, 0, sizeof(combined));
if (!possible_renames(renames))
goto cleanup;
trace2_region_enter("merge", "regular renames", opt->repo);
detect_regular_renames(opt, MERGE_SIDE1);
detect_regular_renames(opt, MERGE_SIDE2);
trace2_region_leave("merge", "regular renames", opt->repo);
trace2_region_enter("merge", "directory renames", opt->repo);
need_dir_renames =
!opt->priv->call_depth &&
(opt->detect_directory_renames == MERGE_DIRECTORY_RENAMES_TRUE ||
opt->detect_directory_renames == MERGE_DIRECTORY_RENAMES_CONFLICT);
if (need_dir_renames) {
get_provisional_directory_renames(opt, MERGE_SIDE1, &clean);
get_provisional_directory_renames(opt, MERGE_SIDE2, &clean);
handle_directory_level_conflicts(opt);
}
ALLOC_GROW(combined.queue,
renames->pairs[1].nr + renames->pairs[2].nr,
combined.alloc);
clean &= collect_renames(opt, &combined, MERGE_SIDE1,
&renames->dir_renames[2],
&renames->dir_renames[1]);
clean &= collect_renames(opt, &combined, MERGE_SIDE2,
&renames->dir_renames[1],
&renames->dir_renames[2]);
QSORT(combined.queue, combined.nr, compare_pairs);
trace2_region_leave("merge", "directory renames", opt->repo);
trace2_region_enter("merge", "process renames", opt->repo);
clean &= process_renames(opt, &combined);
trace2_region_leave("merge", "process renames", opt->repo);
goto simple_cleanup; /* collect_renames() handles some of cleanup */
cleanup:
/*
* Free now unneeded filepairs, which would have been handled
* in collect_renames() normally but we skipped that code.
*/
for (s = MERGE_SIDE1; s <= MERGE_SIDE2; s++) {
struct diff_queue_struct *side_pairs;
int i;
side_pairs = &renames->pairs[s];
for (i = 0; i < side_pairs->nr; ++i) {
struct diff_filepair *p = side_pairs->queue[i];
diff_free_filepair(p);
}
}
simple_cleanup:
/* Free memory for renames->pairs[] and combined */
for (s = MERGE_SIDE1; s <= MERGE_SIDE2; s++) {
free(renames->pairs[s].queue);
DIFF_QUEUE_CLEAR(&renames->pairs[s]);
}
if (combined.nr) {
int i;
for (i = 0; i < combined.nr; i++)
diff_free_filepair(combined.queue[i]);
free(combined.queue);
}
return clean;
}
/*** Function Grouping: functions related to process_entries() ***/
static int string_list_df_name_compare(const char *one, const char *two)
{
int onelen = strlen(one);
int twolen = strlen(two);
/*
* Here we only care that entries for D/F conflicts are
* adjacent, in particular with the file of the D/F conflict
* appearing before files below the corresponding directory.
* The order of the rest of the list is irrelevant for us.
*
* To achieve this, we sort with df_name_compare and provide
* the mode S_IFDIR so that D/F conflicts will sort correctly.
* We use the mode S_IFDIR for everything else for simplicity,
* since in other cases any changes in their order due to
* sorting cause no problems for us.
*/
int cmp = df_name_compare(one, onelen, S_IFDIR,
two, twolen, S_IFDIR);
/*
* Now that 'foo' and 'foo/bar' compare equal, we have to make sure
* that 'foo' comes before 'foo/bar'.
*/
if (cmp)
return cmp;
return onelen - twolen;
}
struct directory_versions {
/*
* versions: list of (basename -> version_info)
*
* The basenames are in reverse lexicographic order of full pathnames,
* as processed in process_entries(). This puts all entries within
* a directory together, and covers the directory itself after
* everything within it, allowing us to write subtrees before needing
* to record information for the tree itself.
*/
struct string_list versions;
/*
* offsets: list of (full relative path directories -> integer offsets)
*
* Since versions contains basenames from files in multiple different
* directories, we need to know which entries in versions correspond
* to which directories. Values of e.g.
* "" 0
* src 2
* src/moduleA 5
* Would mean that entries 0-1 of versions are files in the toplevel
* directory, entries 2-4 are files under src/, and the remaining
* entries starting at index 5 are files under src/moduleA/.
*/
struct string_list offsets;
/*
* last_directory: directory that previously processed file found in
*
* last_directory starts NULL, but records the directory in which the
* previous file was found within. As soon as
* directory(current_file) != last_directory
* then we need to start updating accounting in versions & offsets.
* Note that last_directory is always the last path in "offsets" (or
* NULL if "offsets" is empty) so this exists just for quick access.
*/
const char *last_directory;
/* last_directory_len: cached computation of strlen(last_directory) */
unsigned last_directory_len;
};
static int tree_entry_order(const void *a_, const void *b_)
{
const struct string_list_item *a = a_;
const struct string_list_item *b = b_;
const struct merged_info *ami = a->util;
const struct merged_info *bmi = b->util;
return base_name_compare(a->string, strlen(a->string), ami->result.mode,
b->string, strlen(b->string), bmi->result.mode);
}
static void write_tree(struct object_id *result_oid,
struct string_list *versions,
unsigned int offset,
size_t hash_size)
{
size_t maxlen = 0, extra;
unsigned int nr;
struct strbuf buf = STRBUF_INIT;
int i;
assert(offset <= versions->nr);
nr = versions->nr - offset;
if (versions->nr)
QSORT(versions->items + offset, nr, tree_entry_order);
/* Pre-allocate some space in buf */
extra = hash_size + 8; /* 8: 6 for mode, 1 for space, 1 for NUL char */
for (i = 0; i < nr; i++) {
maxlen += strlen(versions->items[offset+i].string) + extra;
}
strbuf_grow(&buf, maxlen);
/* Write each entry out to buf */
for (i = 0; i < nr; i++) {
struct merged_info *mi = versions->items[offset+i].util;
struct version_info *ri = &mi->result;
strbuf_addf(&buf, "%o %s%c",
ri->mode,
versions->items[offset+i].string, '\0');
strbuf_add(&buf, ri->oid.hash, hash_size);
}
/* Write this object file out, and record in result_oid */
write_object_file(buf.buf, buf.len, tree_type, result_oid);
strbuf_release(&buf);
}
static void record_entry_for_tree(struct directory_versions *dir_metadata,
const char *path,
struct merged_info *mi)
{
const char *basename;
if (mi->is_null)
/* nothing to record */
return;
basename = path + mi->basename_offset;
assert(strchr(basename, '/') == NULL);
string_list_append(&dir_metadata->versions,
basename)->util = &mi->result;
}
static void write_completed_directory(struct merge_options *opt,
const char *new_directory_name,
struct directory_versions *info)
{
const char *prev_dir;
struct merged_info *dir_info = NULL;
unsigned int offset;
/*
* Some explanation of info->versions and info->offsets...
*
* process_entries() iterates over all relevant files AND
* directories in reverse lexicographic order, and calls this
* function. Thus, an example of the paths that process_entries()
* could operate on (along with the directories for those paths
* being shown) is:
*
* xtract.c ""
* tokens.txt ""
* src/moduleB/umm.c src/moduleB
* src/moduleB/stuff.h src/moduleB
* src/moduleB/baz.c src/moduleB
* src/moduleB src
* src/moduleA/foo.c src/moduleA
* src/moduleA/bar.c src/moduleA
* src/moduleA src
* src ""
* Makefile ""
*
* info->versions:
*
* always contains the unprocessed entries and their
* version_info information. For example, after the first five
* entries above, info->versions would be:
*
* xtract.c <xtract.c's version_info>
* token.txt <token.txt's version_info>
* umm.c <src/moduleB/umm.c's version_info>
* stuff.h <src/moduleB/stuff.h's version_info>
* baz.c <src/moduleB/baz.c's version_info>
*
* Once a subdirectory is completed we remove the entries in
* that subdirectory from info->versions, writing it as a tree
* (write_tree()). Thus, as soon as we get to src/moduleB,
* info->versions would be updated to
*
* xtract.c <xtract.c's version_info>
* token.txt <token.txt's version_info>
* moduleB <src/moduleB's version_info>
*
* info->offsets:
*
* helps us track which entries in info->versions correspond to
* which directories. When we are N directories deep (e.g. 4
* for src/modA/submod/subdir/), we have up to N+1 unprocessed
* directories (+1 because of toplevel dir). Corresponding to
* the info->versions example above, after processing five entries
* info->offsets will be:
*
* "" 0
* src/moduleB 2
*
* which is used to know that xtract.c & token.txt are from the
* toplevel dirctory, while umm.c & stuff.h & baz.c are from the
* src/moduleB directory. Again, following the example above,
* once we need to process src/moduleB, then info->offsets is
* updated to
*
* "" 0
* src 2
*
* which says that moduleB (and only moduleB so far) is in the
* src directory.
*
* One unique thing to note about info->offsets here is that
* "src" was not added to info->offsets until there was a path
* (a file OR directory) immediately below src/ that got
* processed.
*
* Since process_entry() just appends new entries to info->versions,
* write_completed_directory() only needs to do work if the next path
* is in a directory that is different than the last directory found
* in info->offsets.
*/
/*
* If we are working with the same directory as the last entry, there
* is no work to do. (See comments above the directory_name member of
* struct merged_info for why we can use pointer comparison instead of
* strcmp here.)
*/
if (new_directory_name == info->last_directory)
return;
/*
* If we are just starting (last_directory is NULL), or last_directory
* is a prefix of the current directory, then we can just update
* info->offsets to record the offset where we started this directory
* and update last_directory to have quick access to it.
*/
if (info->last_directory == NULL ||
!strncmp(new_directory_name, info->last_directory,
info->last_directory_len)) {
uintptr_t offset = info->versions.nr;
info->last_directory = new_directory_name;
info->last_directory_len = strlen(info->last_directory);
/*
* Record the offset into info->versions where we will
* start recording basenames of paths found within
* new_directory_name.
*/
string_list_append(&info->offsets,
info->last_directory)->util = (void*)offset;
return;
}
/*
* The next entry that will be processed will be within
* new_directory_name. Since at this point we know that
* new_directory_name is within a different directory than
* info->last_directory, we have all entries for info->last_directory
* in info->versions and we need to create a tree object for them.
*/
dir_info = strmap_get(&opt->priv->paths, info->last_directory);
assert(dir_info);
offset = (uintptr_t)info->offsets.items[info->offsets.nr-1].util;
if (offset == info->versions.nr) {
/*
* Actually, we don't need to create a tree object in this
* case. Whenever all files within a directory disappear
* during the merge (e.g. unmodified on one side and
* deleted on the other, or files were renamed elsewhere),
* then we get here and the directory itself needs to be
* omitted from its parent tree as well.
*/
dir_info->is_null = 1;
} else {
/*
* Write out the tree to the git object directory, and also
* record the mode and oid in dir_info->result.
*/
dir_info->is_null = 0;
dir_info->result.mode = S_IFDIR;
write_tree(&dir_info->result.oid, &info->versions, offset,
opt->repo->hash_algo->rawsz);
}
/*
* We've now used several entries from info->versions and one entry
* from info->offsets, so we get rid of those values.
*/
info->offsets.nr--;
info->versions.nr = offset;
/*
* Now we've taken care of the completed directory, but we need to
* prepare things since future entries will be in
* new_directory_name. (In particular, process_entry() will be
* appending new entries to info->versions.) So, we need to make
* sure new_directory_name is the last entry in info->offsets.
*/
prev_dir = info->offsets.nr == 0 ? NULL :
info->offsets.items[info->offsets.nr-1].string;
if (new_directory_name != prev_dir) {
uintptr_t c = info->versions.nr;
string_list_append(&info->offsets,
new_directory_name)->util = (void*)c;
}
/* And, of course, we need to update last_directory to match. */
info->last_directory = new_directory_name;
info->last_directory_len = strlen(info->last_directory);
}
/* Per entry merge function */
static void process_entry(struct merge_options *opt,
const char *path,
struct conflict_info *ci,
struct directory_versions *dir_metadata)
{
int df_file_index = 0;
VERIFY_CI(ci);
assert(ci->filemask >= 0 && ci->filemask <= 7);
/* ci->match_mask == 7 was handled in collect_merge_info_callback() */
assert(ci->match_mask == 0 || ci->match_mask == 3 ||
ci->match_mask == 5 || ci->match_mask == 6);
if (ci->dirmask) {
record_entry_for_tree(dir_metadata, path, &ci->merged);
if (ci->filemask == 0)
/* nothing else to handle */
return;
assert(ci->df_conflict);
}
if (ci->df_conflict && ci->merged.result.mode == 0) {
int i;
/*
* directory no longer in the way, but we do have a file we
* need to place here so we need to clean away the "directory
* merges to nothing" result.
*/
ci->df_conflict = 0;
assert(ci->filemask != 0);
ci->merged.clean = 0;
ci->merged.is_null = 0;
/* and we want to zero out any directory-related entries */
ci->match_mask = (ci->match_mask & ~ci->dirmask);
ci->dirmask = 0;
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
if (ci->filemask & (1 << i))
continue;
ci->stages[i].mode = 0;
oidcpy(&ci->stages[i].oid, &null_oid);
}
} else if (ci->df_conflict && ci->merged.result.mode != 0) {
/*
* This started out as a D/F conflict, and the entries in
* the competing directory were not removed by the merge as
* evidenced by write_completed_directory() writing a value
* to ci->merged.result.mode.
*/
struct conflict_info *new_ci;
const char *branch;
const char *old_path = path;
int i;
assert(ci->merged.result.mode == S_IFDIR);
/*
* If filemask is 1, we can just ignore the file as having
* been deleted on both sides. We do not want to overwrite
* ci->merged.result, since it stores the tree for all the
* files under it.
*/
if (ci->filemask == 1) {
ci->filemask = 0;
return;
}
/*
* This file still exists on at least one side, and we want
* the directory to remain here, so we need to move this
* path to some new location.
*/
CALLOC_ARRAY(new_ci, 1);
/* We don't really want new_ci->merged.result copied, but it'll
* be overwritten below so it doesn't matter. We also don't
* want any directory mode/oid values copied, but we'll zero
* those out immediately. We do want the rest of ci copied.
*/
memcpy(new_ci, ci, sizeof(*ci));
new_ci->match_mask = (new_ci->match_mask & ~new_ci->dirmask);
new_ci->dirmask = 0;
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
if (new_ci->filemask & (1 << i))
continue;
/* zero out any entries related to directories */
new_ci->stages[i].mode = 0;
oidcpy(&new_ci->stages[i].oid, &null_oid);
}
/*
* Find out which side this file came from; note that we
* cannot just use ci->filemask, because renames could cause
* the filemask to go back to 7. So we use dirmask, then
* pick the opposite side's index.
*/
df_file_index = (ci->dirmask & (1 << 1)) ? 2 : 1;
branch = (df_file_index == 1) ? opt->branch1 : opt->branch2;
path = unique_path(&opt->priv->paths, path, branch);
strmap_put(&opt->priv->paths, path, new_ci);
path_msg(opt, path, 0,
_("CONFLICT (file/directory): directory in the way "
"of %s from %s; moving it to %s instead."),
old_path, branch, path);
/*
* Zero out the filemask for the old ci. At this point, ci
* was just an entry for a directory, so we don't need to
* do anything more with it.
*/
ci->filemask = 0;
/*
* Now note that we're working on the new entry (path was
* updated above.
*/
ci = new_ci;
}
/*
* NOTE: Below there is a long switch-like if-elseif-elseif... block
* which the code goes through even for the df_conflict cases
* above.
*/
if (ci->match_mask) {
ci->merged.clean = 1;
if (ci->match_mask == 6) {
/* stages[1] == stages[2] */
ci->merged.result.mode = ci->stages[1].mode;
oidcpy(&ci->merged.result.oid, &ci->stages[1].oid);
} else {
/* determine the mask of the side that didn't match */
unsigned int othermask = 7 & ~ci->match_mask;
int side = (othermask == 4) ? 2 : 1;
ci->merged.result.mode = ci->stages[side].mode;
ci->merged.is_null = !ci->merged.result.mode;
oidcpy(&ci->merged.result.oid, &ci->stages[side].oid);
assert(othermask == 2 || othermask == 4);
assert(ci->merged.is_null ==
(ci->filemask == ci->match_mask));
}
} else if (ci->filemask >= 6 &&
(S_IFMT & ci->stages[1].mode) !=
(S_IFMT & ci->stages[2].mode)) {
/* Two different items from (file/submodule/symlink) */
if (opt->priv->call_depth) {
/* Just use the version from the merge base */
ci->merged.clean = 0;
oidcpy(&ci->merged.result.oid, &ci->stages[0].oid);
ci->merged.result.mode = ci->stages[0].mode;
ci->merged.is_null = (ci->merged.result.mode == 0);
} else {
/* Handle by renaming one or both to separate paths. */
unsigned o_mode = ci->stages[0].mode;
unsigned a_mode = ci->stages[1].mode;
unsigned b_mode = ci->stages[2].mode;
struct conflict_info *new_ci;
const char *a_path = NULL, *b_path = NULL;
int rename_a = 0, rename_b = 0;
new_ci = xmalloc(sizeof(*new_ci));
if (S_ISREG(a_mode))
rename_a = 1;
else if (S_ISREG(b_mode))
rename_b = 1;
else {
rename_a = 1;
rename_b = 1;
}
path_msg(opt, path, 0,
_("CONFLICT (distinct types): %s had different "
"types on each side; renamed %s of them so "
"each can be recorded somewhere."),
path,
(rename_a && rename_b) ? _("both") : _("one"));
ci->merged.clean = 0;
memcpy(new_ci, ci, sizeof(*new_ci));
/* Put b into new_ci, removing a from stages */
new_ci->merged.result.mode = ci->stages[2].mode;
oidcpy(&new_ci->merged.result.oid, &ci->stages[2].oid);
new_ci->stages[1].mode = 0;
oidcpy(&new_ci->stages[1].oid, &null_oid);
new_ci->filemask = 5;
if ((S_IFMT & b_mode) != (S_IFMT & o_mode)) {
new_ci->stages[0].mode = 0;
oidcpy(&new_ci->stages[0].oid, &null_oid);
new_ci->filemask = 4;
}
/* Leave only a in ci, fixing stages. */
ci->merged.result.mode = ci->stages[1].mode;
oidcpy(&ci->merged.result.oid, &ci->stages[1].oid);
ci->stages[2].mode = 0;
oidcpy(&ci->stages[2].oid, &null_oid);
ci->filemask = 3;
if ((S_IFMT & a_mode) != (S_IFMT & o_mode)) {
ci->stages[0].mode = 0;
oidcpy(&ci->stages[0].oid, &null_oid);
ci->filemask = 2;
}
/* Insert entries into opt->priv_paths */
assert(rename_a || rename_b);
if (rename_a) {
a_path = unique_path(&opt->priv->paths,
path, opt->branch1);
strmap_put(&opt->priv->paths, a_path, ci);
}
if (rename_b)
b_path = unique_path(&opt->priv->paths,
path, opt->branch2);
else
b_path = path;
strmap_put(&opt->priv->paths, b_path, new_ci);
if (rename_a && rename_b) {
strmap_remove(&opt->priv->paths, path, 0);
/*
* We removed path from opt->priv->paths. path
* will also eventually need to be freed, but
* it may still be used by e.g. ci->pathnames.
* So, store it in another string-list for now.
*/
string_list_append(&opt->priv->paths_to_free,
path);
}
/*
* Do special handling for b_path since process_entry()
* won't be called on it specially.
*/
strmap_put(&opt->priv->conflicted, b_path, new_ci);
record_entry_for_tree(dir_metadata, b_path,
&new_ci->merged);
/*
* Remaining code for processing this entry should
* think in terms of processing a_path.
*/
if (a_path)
path = a_path;
}
} else if (ci->filemask >= 6) {
/* Need a two-way or three-way content merge */
struct version_info merged_file;
unsigned clean_merge;
struct version_info *o = &ci->stages[0];
struct version_info *a = &ci->stages[1];
struct version_info *b = &ci->stages[2];
clean_merge = handle_content_merge(opt, path, o, a, b,
ci->pathnames,
opt->priv->call_depth * 2,
&merged_file);
ci->merged.clean = clean_merge &&
!ci->df_conflict && !ci->path_conflict;
ci->merged.result.mode = merged_file.mode;
ci->merged.is_null = (merged_file.mode == 0);
oidcpy(&ci->merged.result.oid, &merged_file.oid);
if (clean_merge && ci->df_conflict) {
assert(df_file_index == 1 || df_file_index == 2);
ci->filemask = 1 << df_file_index;
ci->stages[df_file_index].mode = merged_file.mode;
oidcpy(&ci->stages[df_file_index].oid, &merged_file.oid);
}
if (!clean_merge) {
const char *reason = _("content");
if (ci->filemask == 6)
reason = _("add/add");
if (S_ISGITLINK(merged_file.mode))
reason = _("submodule");
path_msg(opt, path, 0,
_("CONFLICT (%s): Merge conflict in %s"),
reason, path);
}
} else if (ci->filemask == 3 || ci->filemask == 5) {
/* Modify/delete */
const char *modify_branch, *delete_branch;
int side = (ci->filemask == 5) ? 2 : 1;
int index = opt->priv->call_depth ? 0 : side;
ci->merged.result.mode = ci->stages[index].mode;
oidcpy(&ci->merged.result.oid, &ci->stages[index].oid);
ci->merged.clean = 0;
modify_branch = (side == 1) ? opt->branch1 : opt->branch2;
delete_branch = (side == 1) ? opt->branch2 : opt->branch1;
if (ci->path_conflict &&
oideq(&ci->stages[0].oid, &ci->stages[side].oid)) {
/*
* This came from a rename/delete; no action to take,
* but avoid printing "modify/delete" conflict notice
* since the contents were not modified.
*/
} else {
path_msg(opt, path, 0,
_("CONFLICT (modify/delete): %s deleted in %s "
"and modified in %s. Version %s of %s left "
"in tree."),
path, delete_branch, modify_branch,
modify_branch, path);
}
} else if (ci->filemask == 2 || ci->filemask == 4) {
/* Added on one side */
int side = (ci->filemask == 4) ? 2 : 1;
ci->merged.result.mode = ci->stages[side].mode;
oidcpy(&ci->merged.result.oid, &ci->stages[side].oid);
ci->merged.clean = !ci->df_conflict && !ci->path_conflict;
} else if (ci->filemask == 1) {
/* Deleted on both sides */
ci->merged.is_null = 1;
ci->merged.result.mode = 0;
oidcpy(&ci->merged.result.oid, &null_oid);
ci->merged.clean = !ci->path_conflict;
}
/*
* If still conflicted, record it separately. This allows us to later
* iterate over just conflicted entries when updating the index instead
* of iterating over all entries.
*/
if (!ci->merged.clean)
strmap_put(&opt->priv->conflicted, path, ci);
record_entry_for_tree(dir_metadata, path, &ci->merged);
}
static void process_entries(struct merge_options *opt,
struct object_id *result_oid)
{
struct hashmap_iter iter;
struct strmap_entry *e;
struct string_list plist = STRING_LIST_INIT_NODUP;
struct string_list_item *entry;
struct directory_versions dir_metadata = { STRING_LIST_INIT_NODUP,
STRING_LIST_INIT_NODUP,
NULL, 0 };
trace2_region_enter("merge", "process_entries setup", opt->repo);
if (strmap_empty(&opt->priv->paths)) {
oidcpy(result_oid, opt->repo->hash_algo->empty_tree);
return;
}
/* Hack to pre-allocate plist to the desired size */
trace2_region_enter("merge", "plist grow", opt->repo);
ALLOC_GROW(plist.items, strmap_get_size(&opt->priv->paths), plist.alloc);
trace2_region_leave("merge", "plist grow", opt->repo);
/* Put every entry from paths into plist, then sort */
trace2_region_enter("merge", "plist copy", opt->repo);
strmap_for_each_entry(&opt->priv->paths, &iter, e) {
string_list_append(&plist, e->key)->util = e->value;
}
trace2_region_leave("merge", "plist copy", opt->repo);
trace2_region_enter("merge", "plist special sort", opt->repo);
plist.cmp = string_list_df_name_compare;
string_list_sort(&plist);
trace2_region_leave("merge", "plist special sort", opt->repo);
trace2_region_leave("merge", "process_entries setup", opt->repo);
/*
* Iterate over the items in reverse order, so we can handle paths
* below a directory before needing to handle the directory itself.
*
* This allows us to write subtrees before we need to write trees,
* and it also enables sane handling of directory/file conflicts
* (because it allows us to know whether the directory is still in
* the way when it is time to process the file at the same path).
*/
trace2_region_enter("merge", "processing", opt->repo);
for (entry = &plist.items[plist.nr-1]; entry >= plist.items; --entry) {
char *path = entry->string;
/*
* NOTE: mi may actually be a pointer to a conflict_info, but
* we have to check mi->clean first to see if it's safe to
* reassign to such a pointer type.
*/
struct merged_info *mi = entry->util;
write_completed_directory(opt, mi->directory_name,
&dir_metadata);
if (mi->clean)
record_entry_for_tree(&dir_metadata, path, mi);
else {
struct conflict_info *ci = (struct conflict_info *)mi;
process_entry(opt, path, ci, &dir_metadata);
}
}
trace2_region_leave("merge", "processing", opt->repo);
trace2_region_enter("merge", "process_entries cleanup", opt->repo);
if (dir_metadata.offsets.nr != 1 ||
(uintptr_t)dir_metadata.offsets.items[0].util != 0) {
printf("dir_metadata.offsets.nr = %d (should be 1)\n",
dir_metadata.offsets.nr);
printf("dir_metadata.offsets.items[0].util = %u (should be 0)\n",
(unsigned)(uintptr_t)dir_metadata.offsets.items[0].util);
fflush(stdout);
BUG("dir_metadata accounting completely off; shouldn't happen");
}
write_tree(result_oid, &dir_metadata.versions, 0,
opt->repo->hash_algo->rawsz);
string_list_clear(&plist, 0);
string_list_clear(&dir_metadata.versions, 0);
string_list_clear(&dir_metadata.offsets, 0);
trace2_region_leave("merge", "process_entries cleanup", opt->repo);
}
/*** Function Grouping: functions related to merge_switch_to_result() ***/
static int checkout(struct merge_options *opt,
struct tree *prev,
struct tree *next)
{
/* Switch the index/working copy from old to new */
int ret;
struct tree_desc trees[2];
struct unpack_trees_options unpack_opts;
memset(&unpack_opts, 0, sizeof(unpack_opts));
unpack_opts.head_idx = -1;
unpack_opts.src_index = opt->repo->index;
unpack_opts.dst_index = opt->repo->index;
setup_unpack_trees_porcelain(&unpack_opts, "merge");
/*
* NOTE: if this were just "git checkout" code, we would probably
* read or refresh the cache and check for a conflicted index, but
* builtin/merge.c or sequencer.c really needs to read the index
* and check for conflicted entries before starting merging for a
* good user experience (no sense waiting for merges/rebases before
* erroring out), so there's no reason to duplicate that work here.
*/
/* 2-way merge to the new branch */
unpack_opts.update = 1;
unpack_opts.merge = 1;
unpack_opts.quiet = 0; /* FIXME: sequencer might want quiet? */
unpack_opts.verbose_update = (opt->verbosity > 2);
unpack_opts.fn = twoway_merge;
if (1/* FIXME: opts->overwrite_ignore*/) {
CALLOC_ARRAY(unpack_opts.dir, 1);
unpack_opts.dir->flags |= DIR_SHOW_IGNORED;
setup_standard_excludes(unpack_opts.dir);
}
parse_tree(prev);
init_tree_desc(&trees[0], prev->buffer, prev->size);
parse_tree(next);
init_tree_desc(&trees[1], next->buffer, next->size);
ret = unpack_trees(2, trees, &unpack_opts);
clear_unpack_trees_porcelain(&unpack_opts);
dir_clear(unpack_opts.dir);
FREE_AND_NULL(unpack_opts.dir);
return ret;
}
static int record_conflicted_index_entries(struct merge_options *opt,
struct index_state *index,
struct strmap *paths,
struct strmap *conflicted)
{
struct hashmap_iter iter;
struct strmap_entry *e;
int errs = 0;
int original_cache_nr;
if (strmap_empty(conflicted))
return 0;
original_cache_nr = index->cache_nr;
/* Put every entry from paths into plist, then sort */
strmap_for_each_entry(conflicted, &iter, e) {
const char *path = e->key;
struct conflict_info *ci = e->value;
int pos;
struct cache_entry *ce;
int i;
VERIFY_CI(ci);
/*
* The index will already have a stage=0 entry for this path,
* because we created an as-merged-as-possible version of the
* file and checkout() moved the working copy and index over
* to that version.
*
* However, previous iterations through this loop will have
* added unstaged entries to the end of the cache which
* ignore the standard alphabetical ordering of cache
* entries and break invariants needed for index_name_pos()
* to work. However, we know the entry we want is before
* those appended cache entries, so do a temporary swap on
* cache_nr to only look through entries of interest.
*/
SWAP(index->cache_nr, original_cache_nr);
pos = index_name_pos(index, path, strlen(path));
SWAP(index->cache_nr, original_cache_nr);
if (pos < 0) {
if (ci->filemask != 1)
BUG("Conflicted %s but nothing in basic working tree or index; this shouldn't happen", path);
cache_tree_invalidate_path(index, path);
} else {
ce = index->cache[pos];
/*
* Clean paths with CE_SKIP_WORKTREE set will not be
* written to the working tree by the unpack_trees()
* call in checkout(). Our conflicted entries would
* have appeared clean to that code since we ignored
* the higher order stages. Thus, we need override
* the CE_SKIP_WORKTREE bit and manually write those
* files to the working disk here.
*
* TODO: Implement this CE_SKIP_WORKTREE fixup.
*/
/*
* Mark this cache entry for removal and instead add
* new stage>0 entries corresponding to the
* conflicts. If there are many conflicted entries, we
* want to avoid memmove'ing O(NM) entries by
* inserting the new entries one at a time. So,
* instead, we just add the new cache entries to the
* end (ignoring normal index requirements on sort
* order) and sort the index once we're all done.
*/
ce->ce_flags |= CE_REMOVE;
}
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
struct version_info *vi;
if (!(ci->filemask & (1ul << i)))
continue;
vi = &ci->stages[i];
ce = make_cache_entry(index, vi->mode, &vi->oid,
path, i+1, 0);
add_index_entry(index, ce, ADD_CACHE_JUST_APPEND);
}
}
/*
* Remove the unused cache entries (and invalidate the relevant
* cache-trees), then sort the index entries to get the conflicted
* entries we added to the end into their right locations.
*/
remove_marked_cache_entries(index, 1);
QSORT(index->cache, index->cache_nr, cmp_cache_name_compare);
return errs;
}
void merge_switch_to_result(struct merge_options *opt,
struct tree *head,
struct merge_result *result,
int update_worktree_and_index,
int display_update_msgs)
{
assert(opt->priv == NULL);
if (result->clean >= 0 && update_worktree_and_index) {
struct merge_options_internal *opti = result->priv;
trace2_region_enter("merge", "checkout", opt->repo);
if (checkout(opt, head, result->tree)) {
/* failure to function */
result->clean = -1;
return;
}
trace2_region_leave("merge", "checkout", opt->repo);
trace2_region_enter("merge", "record_conflicted", opt->repo);
if (record_conflicted_index_entries(opt, opt->repo->index,
&opti->paths,
&opti->conflicted)) {
/* failure to function */
result->clean = -1;
return;
}
trace2_region_leave("merge", "record_conflicted", opt->repo);
}
if (display_update_msgs) {
struct merge_options_internal *opti = result->priv;
struct hashmap_iter iter;
struct strmap_entry *e;
struct string_list olist = STRING_LIST_INIT_NODUP;
int i;
trace2_region_enter("merge", "display messages", opt->repo);
/* Hack to pre-allocate olist to the desired size */
ALLOC_GROW(olist.items, strmap_get_size(&opti->output),
olist.alloc);
/* Put every entry from output into olist, then sort */
strmap_for_each_entry(&opti->output, &iter, e) {
string_list_append(&olist, e->key)->util = e->value;
}
string_list_sort(&olist);
/* Iterate over the items, printing them */
for (i = 0; i < olist.nr; ++i) {
struct strbuf *sb = olist.items[i].util;
printf("%s", sb->buf);
}
string_list_clear(&olist, 0);
/* Also include needed rename limit adjustment now */
diff_warn_rename_limit("merge.renamelimit",
opti->renames.needed_limit, 0);
trace2_region_leave("merge", "display messages", opt->repo);
}
merge_finalize(opt, result);
}
void merge_finalize(struct merge_options *opt,
struct merge_result *result)
{
struct merge_options_internal *opti = result->priv;
assert(opt->priv == NULL);
clear_or_reinit_internal_opts(opti, 0);
FREE_AND_NULL(opti);
}
/*** Function Grouping: helper functions for merge_incore_*() ***/
static inline void set_commit_tree(struct commit *c, struct tree *t)
{
c->maybe_tree = t;
}
static struct commit *make_virtual_commit(struct repository *repo,
struct tree *tree,
const char *comment)
{
struct commit *commit = alloc_commit_node(repo);
set_merge_remote_desc(commit, comment, (struct object *)commit);
set_commit_tree(commit, tree);
commit->object.parsed = 1;
return commit;
}
static void merge_start(struct merge_options *opt, struct merge_result *result)
{
struct rename_info *renames;
int i;
/* Sanity checks on opt */
trace2_region_enter("merge", "sanity checks", opt->repo);
assert(opt->repo);
assert(opt->branch1 && opt->branch2);
assert(opt->detect_directory_renames >= MERGE_DIRECTORY_RENAMES_NONE &&
opt->detect_directory_renames <= MERGE_DIRECTORY_RENAMES_TRUE);
assert(opt->rename_limit >= -1);
assert(opt->rename_score >= 0 && opt->rename_score <= MAX_SCORE);
assert(opt->show_rename_progress >= 0 && opt->show_rename_progress <= 1);
assert(opt->xdl_opts >= 0);
assert(opt->recursive_variant >= MERGE_VARIANT_NORMAL &&
opt->recursive_variant <= MERGE_VARIANT_THEIRS);
/*
* detect_renames, verbosity, buffer_output, and obuf are ignored
* fields that were used by "recursive" rather than "ort" -- but
* sanity check them anyway.
*/
assert(opt->detect_renames >= -1 &&
opt->detect_renames <= DIFF_DETECT_COPY);
assert(opt->verbosity >= 0 && opt->verbosity <= 5);
assert(opt->buffer_output <= 2);
assert(opt->obuf.len == 0);
assert(opt->priv == NULL);
if (result->priv) {
opt->priv = result->priv;
result->priv = NULL;
/*
* opt->priv non-NULL means we had results from a previous
* run; do a few sanity checks that user didn't mess with
* it in an obvious fashion.
*/
assert(opt->priv->call_depth == 0);
assert(!opt->priv->toplevel_dir ||
0 == strlen(opt->priv->toplevel_dir));
}
trace2_region_leave("merge", "sanity checks", opt->repo);
/* Default to histogram diff. Actually, just hardcode it...for now. */
opt->xdl_opts = DIFF_WITH_ALG(opt, HISTOGRAM_DIFF);
/* Initialization of opt->priv, our internal merge data */
trace2_region_enter("merge", "allocate/init", opt->repo);
if (opt->priv) {
clear_or_reinit_internal_opts(opt->priv, 1);
trace2_region_leave("merge", "allocate/init", opt->repo);
return;
}
opt->priv = xcalloc(1, sizeof(*opt->priv));
/* Initialization of various renames fields */
renames = &opt->priv->renames;
for (i = MERGE_SIDE1; i <= MERGE_SIDE2; i++) {
strset_init_with_options(&renames->dirs_removed[i],
NULL, 0);
strmap_init_with_options(&renames->dir_rename_count[i],
NULL, 1);
strmap_init_with_options(&renames->dir_renames[i],
NULL, 0);
strset_init_with_options(&renames->relevant_sources[i],
NULL, 0);
}
/*
* Although we initialize opt->priv->paths with strdup_strings=0,
* that's just to avoid making yet another copy of an allocated
* string. Putting the entry into paths means we are taking
* ownership, so we will later free it. paths_to_free is similar.
*
* In contrast, conflicted just has a subset of keys from paths, so
* we don't want to free those (it'd be a duplicate free).
*/
strmap_init_with_options(&opt->priv->paths, NULL, 0);
strmap_init_with_options(&opt->priv->conflicted, NULL, 0);
string_list_init(&opt->priv->paths_to_free, 0);
/*
* keys & strbufs in output will sometimes need to outlive "paths",
* so it will have a copy of relevant keys. It's probably a small
* subset of the overall paths that have special output.
*/
strmap_init(&opt->priv->output);
trace2_region_leave("merge", "allocate/init", opt->repo);
}
/*** Function Grouping: merge_incore_*() and their internal variants ***/
/*
* Originally from merge_trees_internal(); heavily adapted, though.
*/
static void merge_ort_nonrecursive_internal(struct merge_options *opt,
struct tree *merge_base,
struct tree *side1,
struct tree *side2,
struct merge_result *result)
{
struct object_id working_tree_oid;
trace2_region_enter("merge", "collect_merge_info", opt->repo);
if (collect_merge_info(opt, merge_base, side1, side2) != 0) {
/*
* TRANSLATORS: The %s arguments are: 1) tree hash of a merge
* base, and 2-3) the trees for the two trees we're merging.
*/
err(opt, _("collecting merge info failed for trees %s, %s, %s"),
oid_to_hex(&merge_base->object.oid),
oid_to_hex(&side1->object.oid),
oid_to_hex(&side2->object.oid));
result->clean = -1;
return;
}
trace2_region_leave("merge", "collect_merge_info", opt->repo);
trace2_region_enter("merge", "renames", opt->repo);
result->clean = detect_and_process_renames(opt, merge_base,
side1, side2);
trace2_region_leave("merge", "renames", opt->repo);
trace2_region_enter("merge", "process_entries", opt->repo);
process_entries(opt, &working_tree_oid);
trace2_region_leave("merge", "process_entries", opt->repo);
/* Set return values */
result->tree = parse_tree_indirect(&working_tree_oid);
/* existence of conflicted entries implies unclean */
result->clean &= strmap_empty(&opt->priv->conflicted);
if (!opt->priv->call_depth) {
result->priv = opt->priv;
opt->priv = NULL;
}
}
/*
* Originally from merge_recursive_internal(); somewhat adapted, though.
*/
static void merge_ort_internal(struct merge_options *opt,
struct commit_list *merge_bases,
struct commit *h1,
struct commit *h2,
struct merge_result *result)
{
struct commit_list *iter;
struct commit *merged_merge_bases;
const char *ancestor_name;
struct strbuf merge_base_abbrev = STRBUF_INIT;
if (!merge_bases) {
merge_bases = get_merge_bases(h1, h2);
/* See merge-ort.h:merge_incore_recursive() declaration NOTE */
merge_bases = reverse_commit_list(merge_bases);
}
merged_merge_bases = pop_commit(&merge_bases);
if (merged_merge_bases == NULL) {
/* if there is no common ancestor, use an empty tree */
struct tree *tree;
tree = lookup_tree(opt->repo, opt->repo->hash_algo->empty_tree);
merged_merge_bases = make_virtual_commit(opt->repo, tree,
"ancestor");
ancestor_name = "empty tree";
} else if (merge_bases) {
ancestor_name = "merged common ancestors";
} else {
strbuf_add_unique_abbrev(&merge_base_abbrev,
&merged_merge_bases->object.oid,
DEFAULT_ABBREV);
ancestor_name = merge_base_abbrev.buf;
}
for (iter = merge_bases; iter; iter = iter->next) {
const char *saved_b1, *saved_b2;
struct commit *prev = merged_merge_bases;
opt->priv->call_depth++;
/*
* When the merge fails, the result contains files
* with conflict markers. The cleanness flag is
* ignored (unless indicating an error), it was never
* actually used, as result of merge_trees has always
* overwritten it: the committed "conflicts" were
* already resolved.
*/
saved_b1 = opt->branch1;
saved_b2 = opt->branch2;
opt->branch1 = "Temporary merge branch 1";
opt->branch2 = "Temporary merge branch 2";
merge_ort_internal(opt, NULL, prev, iter->item, result);
if (result->clean < 0)
return;
opt->branch1 = saved_b1;
opt->branch2 = saved_b2;
opt->priv->call_depth--;
merged_merge_bases = make_virtual_commit(opt->repo,
result->tree,
"merged tree");
commit_list_insert(prev, &merged_merge_bases->parents);
commit_list_insert(iter->item,
&merged_merge_bases->parents->next);
clear_or_reinit_internal_opts(opt->priv, 1);
}
opt->ancestor = ancestor_name;
merge_ort_nonrecursive_internal(opt,
repo_get_commit_tree(opt->repo,
merged_merge_bases),
repo_get_commit_tree(opt->repo, h1),
repo_get_commit_tree(opt->repo, h2),
result);
strbuf_release(&merge_base_abbrev);
opt->ancestor = NULL; /* avoid accidental re-use of opt->ancestor */
}
void merge_incore_nonrecursive(struct merge_options *opt,
struct tree *merge_base,
struct tree *side1,
struct tree *side2,
struct merge_result *result)
{
trace2_region_enter("merge", "incore_nonrecursive", opt->repo);
trace2_region_enter("merge", "merge_start", opt->repo);
assert(opt->ancestor != NULL);
merge_start(opt, result);
trace2_region_leave("merge", "merge_start", opt->repo);
merge_ort_nonrecursive_internal(opt, merge_base, side1, side2, result);
trace2_region_leave("merge", "incore_nonrecursive", opt->repo);
}
void merge_incore_recursive(struct merge_options *opt,
struct commit_list *merge_bases,
struct commit *side1,
struct commit *side2,
struct merge_result *result)
{
trace2_region_enter("merge", "incore_recursive", opt->repo);
/* We set the ancestor label based on the merge_bases */
assert(opt->ancestor == NULL);
trace2_region_enter("merge", "merge_start", opt->repo);
merge_start(opt, result);
trace2_region_leave("merge", "merge_start", opt->repo);
merge_ort_internal(opt, merge_bases, side1, side2, result);
trace2_region_leave("merge", "incore_recursive", opt->repo);
}
|