summaryrefslogtreecommitdiff
path: root/fast-import.c
blob: c8b372bc4abbfdd6b3b3e31cc12bfe2ac0d9e838 (plain)
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
/*
(See Documentation/git-fast-import.txt for maintained documentation.)
Format of STDIN stream:

  stream ::= cmd*;

  cmd ::= new_blob
        | new_commit
        | new_tag
        | reset_branch
        | checkpoint
        | progress
        ;

  new_blob ::= 'blob' lf
    mark?
    file_content;
  file_content ::= data;

  new_commit ::= 'commit' sp ref_str lf
    mark?
    ('author' (sp name)? sp '<' email '>' sp when lf)?
    'committer' (sp name)? sp '<' email '>' sp when lf
    commit_msg
    ('from' sp commit-ish lf)?
    ('merge' sp commit-ish lf)*
    (file_change | ls)*
    lf?;
  commit_msg ::= data;

  ls ::= 'ls' sp '"' quoted(path) '"' lf;

  file_change ::= file_clr
    | file_del
    | file_rnm
    | file_cpy
    | file_obm
    | file_inm;
  file_clr ::= 'deleteall' lf;
  file_del ::= 'D' sp path_str lf;
  file_rnm ::= 'R' sp path_str sp path_str lf;
  file_cpy ::= 'C' sp path_str sp path_str lf;
  file_obm ::= 'M' sp mode sp (hexsha1 | idnum) sp path_str lf;
  file_inm ::= 'M' sp mode sp 'inline' sp path_str lf
    data;
  note_obm ::= 'N' sp (hexsha1 | idnum) sp commit-ish lf;
  note_inm ::= 'N' sp 'inline' sp commit-ish lf
    data;

  new_tag ::= 'tag' sp tag_str lf
    'from' sp commit-ish lf
    ('tagger' (sp name)? sp '<' email '>' sp when lf)?
    tag_msg;
  tag_msg ::= data;

  reset_branch ::= 'reset' sp ref_str lf
    ('from' sp commit-ish lf)?
    lf?;

  checkpoint ::= 'checkpoint' lf
    lf?;

  progress ::= 'progress' sp not_lf* lf
    lf?;

     # note: the first idnum in a stream should be 1 and subsequent
     # idnums should not have gaps between values as this will cause
     # the stream parser to reserve space for the gapped values.  An
     # idnum can be updated in the future to a new object by issuing
     # a new mark directive with the old idnum.
     #
  mark ::= 'mark' sp idnum lf;
  data ::= (delimited_data | exact_data)
    lf?;

    # note: delim may be any string but must not contain lf.
    # data_line may contain any data but must not be exactly
    # delim.
  delimited_data ::= 'data' sp '<<' delim lf
    (data_line lf)*
    delim lf;

     # note: declen indicates the length of binary_data in bytes.
     # declen does not include the lf preceding the binary data.
     #
  exact_data ::= 'data' sp declen lf
    binary_data;

     # note: quoted strings are C-style quoting supporting \c for
     # common escapes of 'c' (e..g \n, \t, \\, \") or \nnn where nnn
     # is the signed byte value in octal.  Note that the only
     # characters which must actually be escaped to protect the
     # stream formatting is: \, " and LF.  Otherwise these values
     # are UTF8.
     #
  commit-ish  ::= (ref_str | hexsha1 | sha1exp_str | idnum);
  ref_str     ::= ref;
  sha1exp_str ::= sha1exp;
  tag_str     ::= tag;
  path_str    ::= path    | '"' quoted(path)    '"' ;
  mode        ::= '100644' | '644'
                | '100755' | '755'
                | '120000'
                ;

  declen ::= # unsigned 32 bit value, ascii base10 notation;
  bigint ::= # unsigned integer value, ascii base10 notation;
  binary_data ::= # file content, not interpreted;

  when         ::= raw_when | rfc2822_when;
  raw_when     ::= ts sp tz;
  rfc2822_when ::= # Valid RFC 2822 date and time;

  sp ::= # ASCII space character;
  lf ::= # ASCII newline (LF) character;

     # note: a colon (':') must precede the numerical value assigned to
     # an idnum.  This is to distinguish it from a ref or tag name as
     # GIT does not permit ':' in ref or tag strings.
     #
  idnum   ::= ':' bigint;
  path    ::= # GIT style file path, e.g. "a/b/c";
  ref     ::= # GIT ref name, e.g. "refs/heads/MOZ_GECKO_EXPERIMENT";
  tag     ::= # GIT tag name, e.g. "FIREFOX_1_5";
  sha1exp ::= # Any valid GIT SHA1 expression;
  hexsha1 ::= # SHA1 in hexadecimal format;

     # note: name and email are UTF8 strings, however name must not
     # contain '<' or lf and email must not contain any of the
     # following: '<', '>', lf.
     #
  name  ::= # valid GIT author/committer name;
  email ::= # valid GIT author/committer email;
  ts    ::= # time since the epoch in seconds, ascii base10 notation;
  tz    ::= # GIT style timezone;

     # note: comments, get-mark, ls-tree, and cat-blob requests may
     # appear anywhere in the input, except within a data command. Any
     # form of the data command always escapes the related input from
     # comment processing.
     #
     # In case it is not clear, the '#' that starts the comment
     # must be the first character on that line (an lf
     # preceded it).
     #

  get_mark ::= 'get-mark' sp idnum lf;
  cat_blob ::= 'cat-blob' sp (hexsha1 | idnum) lf;
  ls_tree  ::= 'ls' sp (hexsha1 | idnum) sp path_str lf;

  comment ::= '#' not_lf* lf;
  not_lf  ::= # Any byte that is not ASCII newline (LF);
*/

#include "builtin.h"
#include "cache.h"
#include "repository.h"
#include "config.h"
#include "lockfile.h"
#include "object.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
#include "delta.h"
#include "pack.h"
#include "refs.h"
#include "csum-file.h"
#include "quote.h"
#include "dir.h"
#include "run-command.h"
#include "packfile.h"
#include "object-store.h"
#include "mem-pool.h"
#include "commit-reach.h"

#define PACK_ID_BITS 16
#define MAX_PACK_ID ((1<<PACK_ID_BITS)-1)
#define DEPTH_BITS 13
#define MAX_DEPTH ((1<<DEPTH_BITS)-1)

/*
 * We abuse the setuid bit on directories to mean "do not delta".
 */
#define NO_DELTA S_ISUID

struct object_entry {
	struct pack_idx_entry idx;
	struct object_entry *next;
	uint32_t type : TYPE_BITS,
		pack_id : PACK_ID_BITS,
		depth : DEPTH_BITS;
};

struct object_entry_pool {
	struct object_entry_pool *next_pool;
	struct object_entry *next_free;
	struct object_entry *end;
	struct object_entry entries[FLEX_ARRAY]; /* more */
};

struct mark_set {
	union {
		struct object_entry *marked[1024];
		struct mark_set *sets[1024];
	} data;
	unsigned int shift;
};

struct last_object {
	struct strbuf data;
	off_t offset;
	unsigned int depth;
	unsigned no_swap : 1;
};

struct atom_str {
	struct atom_str *next_atom;
	unsigned short str_len;
	char str_dat[FLEX_ARRAY]; /* more */
};

struct tree_content;
struct tree_entry {
	struct tree_content *tree;
	struct atom_str *name;
	struct tree_entry_ms {
		uint16_t mode;
		struct object_id oid;
	} versions[2];
};

struct tree_content {
	unsigned int entry_capacity; /* must match avail_tree_content */
	unsigned int entry_count;
	unsigned int delta_depth;
	struct tree_entry *entries[FLEX_ARRAY]; /* more */
};

struct avail_tree_content {
	unsigned int entry_capacity; /* must match tree_content */
	struct avail_tree_content *next_avail;
};

struct branch {
	struct branch *table_next_branch;
	struct branch *active_next_branch;
	const char *name;
	struct tree_entry branch_tree;
	uintmax_t last_commit;
	uintmax_t num_notes;
	unsigned active : 1;
	unsigned delete : 1;
	unsigned pack_id : PACK_ID_BITS;
	struct object_id oid;
};

struct tag {
	struct tag *next_tag;
	const char *name;
	unsigned int pack_id;
	struct object_id oid;
};

struct hash_list {
	struct hash_list *next;
	struct object_id oid;
};

typedef enum {
	WHENSPEC_RAW = 1,
	WHENSPEC_RFC2822,
	WHENSPEC_NOW
} whenspec_type;

struct recent_command {
	struct recent_command *prev;
	struct recent_command *next;
	char *buf;
};

/* Configured limits on output */
static unsigned long max_depth = 50;
static off_t max_packsize;
static int unpack_limit = 100;
static int force_update;

/* Stats and misc. counters */
static uintmax_t alloc_count;
static uintmax_t marks_set_count;
static uintmax_t object_count_by_type[1 << TYPE_BITS];
static uintmax_t duplicate_count_by_type[1 << TYPE_BITS];
static uintmax_t delta_count_by_type[1 << TYPE_BITS];
static uintmax_t delta_count_attempts_by_type[1 << TYPE_BITS];
static unsigned long object_count;
static unsigned long branch_count;
static unsigned long branch_load_count;
static int failure;
static FILE *pack_edges;
static unsigned int show_stats = 1;
static int global_argc;
static const char **global_argv;

/* Memory pools */
static struct mem_pool fi_mem_pool =  {NULL, 2*1024*1024 -
				       sizeof(struct mp_block), 0 };

/* Atom management */
static unsigned int atom_table_sz = 4451;
static unsigned int atom_cnt;
static struct atom_str **atom_table;

/* The .pack file being generated */
static struct pack_idx_option pack_idx_opts;
static unsigned int pack_id;
static struct hashfile *pack_file;
static struct packed_git *pack_data;
static struct packed_git **all_packs;
static off_t pack_size;

/* Table of objects we've written. */
static unsigned int object_entry_alloc = 5000;
static struct object_entry_pool *blocks;
static struct object_entry *object_table[1 << 16];
static struct mark_set *marks;
static const char *export_marks_file;
static const char *import_marks_file;
static int import_marks_file_from_stream;
static int import_marks_file_ignore_missing;
static int import_marks_file_done;
static int relative_marks_paths;

/* Our last blob */
static struct last_object last_blob = { STRBUF_INIT, 0, 0, 0 };

/* Tree management */
static unsigned int tree_entry_alloc = 1000;
static void *avail_tree_entry;
static unsigned int avail_tree_table_sz = 100;
static struct avail_tree_content **avail_tree_table;
static size_t tree_entry_allocd;
static struct strbuf old_tree = STRBUF_INIT;
static struct strbuf new_tree = STRBUF_INIT;

/* Branch data */
static unsigned long max_active_branches = 5;
static unsigned long cur_active_branches;
static unsigned long branch_table_sz = 1039;
static struct branch **branch_table;
static struct branch *active_branches;

/* Tag data */
static struct tag *first_tag;
static struct tag *last_tag;

/* Input stream parsing */
static whenspec_type whenspec = WHENSPEC_RAW;
static struct strbuf command_buf = STRBUF_INIT;
static int unread_command_buf;
static struct recent_command cmd_hist = {&cmd_hist, &cmd_hist, NULL};
static struct recent_command *cmd_tail = &cmd_hist;
static struct recent_command *rc_free;
static unsigned int cmd_save = 100;
static uintmax_t next_mark;
static struct strbuf new_data = STRBUF_INIT;
static int seen_data_command;
static int require_explicit_termination;
static int allow_unsafe_features;

/* Signal handling */
static volatile sig_atomic_t checkpoint_requested;

/* Where to write output of cat-blob commands */
static int cat_blob_fd = STDOUT_FILENO;

static void parse_argv(void);
static void parse_get_mark(const char *p);
static void parse_cat_blob(const char *p);
static void parse_ls(const char *p, struct branch *b);

static void write_branch_report(FILE *rpt, struct branch *b)
{
	fprintf(rpt, "%s:\n", b->name);

	fprintf(rpt, "  status      :");
	if (b->active)
		fputs(" active", rpt);
	if (b->branch_tree.tree)
		fputs(" loaded", rpt);
	if (is_null_oid(&b->branch_tree.versions[1].oid))
		fputs(" dirty", rpt);
	fputc('\n', rpt);

	fprintf(rpt, "  tip commit  : %s\n", oid_to_hex(&b->oid));
	fprintf(rpt, "  old tree    : %s\n",
		oid_to_hex(&b->branch_tree.versions[0].oid));
	fprintf(rpt, "  cur tree    : %s\n",
		oid_to_hex(&b->branch_tree.versions[1].oid));
	fprintf(rpt, "  commit clock: %" PRIuMAX "\n", b->last_commit);

	fputs("  last pack   : ", rpt);
	if (b->pack_id < MAX_PACK_ID)
		fprintf(rpt, "%u", b->pack_id);
	fputc('\n', rpt);

	fputc('\n', rpt);
}

static void dump_marks_helper(FILE *, uintmax_t, struct mark_set *);

static void write_crash_report(const char *err)
{
	char *loc = git_pathdup("fast_import_crash_%"PRIuMAX, (uintmax_t) getpid());
	FILE *rpt = fopen(loc, "w");
	struct branch *b;
	unsigned long lu;
	struct recent_command *rc;

	if (!rpt) {
		error_errno("can't write crash report %s", loc);
		free(loc);
		return;
	}

	fprintf(stderr, "fast-import: dumping crash report to %s\n", loc);

	fprintf(rpt, "fast-import crash report:\n");
	fprintf(rpt, "    fast-import process: %"PRIuMAX"\n", (uintmax_t) getpid());
	fprintf(rpt, "    parent process     : %"PRIuMAX"\n", (uintmax_t) getppid());
	fprintf(rpt, "    at %s\n", show_date(time(NULL), 0, DATE_MODE(ISO8601)));
	fputc('\n', rpt);

	fputs("fatal: ", rpt);
	fputs(err, rpt);
	fputc('\n', rpt);

	fputc('\n', rpt);
	fputs("Most Recent Commands Before Crash\n", rpt);
	fputs("---------------------------------\n", rpt);
	for (rc = cmd_hist.next; rc != &cmd_hist; rc = rc->next) {
		if (rc->next == &cmd_hist)
			fputs("* ", rpt);
		else
			fputs("  ", rpt);
		fputs(rc->buf, rpt);
		fputc('\n', rpt);
	}

	fputc('\n', rpt);
	fputs("Active Branch LRU\n", rpt);
	fputs("-----------------\n", rpt);
	fprintf(rpt, "    active_branches = %lu cur, %lu max\n",
		cur_active_branches,
		max_active_branches);
	fputc('\n', rpt);
	fputs("  pos  clock name\n", rpt);
	fputs("  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n", rpt);
	for (b = active_branches, lu = 0; b; b = b->active_next_branch)
		fprintf(rpt, "  %2lu) %6" PRIuMAX" %s\n",
			++lu, b->last_commit, b->name);

	fputc('\n', rpt);
	fputs("Inactive Branches\n", rpt);
	fputs("-----------------\n", rpt);
	for (lu = 0; lu < branch_table_sz; lu++) {
		for (b = branch_table[lu]; b; b = b->table_next_branch)
			write_branch_report(rpt, b);
	}

	if (first_tag) {
		struct tag *tg;
		fputc('\n', rpt);
		fputs("Annotated Tags\n", rpt);
		fputs("--------------\n", rpt);
		for (tg = first_tag; tg; tg = tg->next_tag) {
			fputs(oid_to_hex(&tg->oid), rpt);
			fputc(' ', rpt);
			fputs(tg->name, rpt);
			fputc('\n', rpt);
		}
	}

	fputc('\n', rpt);
	fputs("Marks\n", rpt);
	fputs("-----\n", rpt);
	if (export_marks_file)
		fprintf(rpt, "  exported to %s\n", export_marks_file);
	else
		dump_marks_helper(rpt, 0, marks);

	fputc('\n', rpt);
	fputs("-------------------\n", rpt);
	fputs("END OF CRASH REPORT\n", rpt);
	fclose(rpt);
	free(loc);
}

static void end_packfile(void);
static void unkeep_all_packs(void);
static void dump_marks(void);

static NORETURN void die_nicely(const char *err, va_list params)
{
	static int zombie;
	char message[2 * PATH_MAX];

	vsnprintf(message, sizeof(message), err, params);
	fputs("fatal: ", stderr);
	fputs(message, stderr);
	fputc('\n', stderr);

	if (!zombie) {
		zombie = 1;
		write_crash_report(message);
		end_packfile();
		unkeep_all_packs();
		dump_marks();
	}
	exit(128);
}

#ifndef SIGUSR1	/* Windows, for example */

static void set_checkpoint_signal(void)
{
}

#else

static void checkpoint_signal(int signo)
{
	checkpoint_requested = 1;
}

static void set_checkpoint_signal(void)
{
	struct sigaction sa;

	memset(&sa, 0, sizeof(sa));
	sa.sa_handler = checkpoint_signal;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_RESTART;
	sigaction(SIGUSR1, &sa, NULL);
}

#endif

static void alloc_objects(unsigned int cnt)
{
	struct object_entry_pool *b;

	b = xmalloc(sizeof(struct object_entry_pool)
		+ cnt * sizeof(struct object_entry));
	b->next_pool = blocks;
	b->next_free = b->entries;
	b->end = b->entries + cnt;
	blocks = b;
	alloc_count += cnt;
}

static struct object_entry *new_object(struct object_id *oid)
{
	struct object_entry *e;

	if (blocks->next_free == blocks->end)
		alloc_objects(object_entry_alloc);

	e = blocks->next_free++;
	oidcpy(&e->idx.oid, oid);
	return e;
}

static struct object_entry *find_object(struct object_id *oid)
{
	unsigned int h = oid->hash[0] << 8 | oid->hash[1];
	struct object_entry *e;
	for (e = object_table[h]; e; e = e->next)
		if (oideq(oid, &e->idx.oid))
			return e;
	return NULL;
}

static struct object_entry *insert_object(struct object_id *oid)
{
	unsigned int h = oid->hash[0] << 8 | oid->hash[1];
	struct object_entry *e = object_table[h];

	while (e) {
		if (oideq(oid, &e->idx.oid))
			return e;
		e = e->next;
	}

	e = new_object(oid);
	e->next = object_table[h];
	e->idx.offset = 0;
	object_table[h] = e;
	return e;
}

static void invalidate_pack_id(unsigned int id)
{
	unsigned int h;
	unsigned long lu;
	struct tag *t;

	for (h = 0; h < ARRAY_SIZE(object_table); h++) {
		struct object_entry *e;

		for (e = object_table[h]; e; e = e->next)
			if (e->pack_id == id)
				e->pack_id = MAX_PACK_ID;
	}

	for (lu = 0; lu < branch_table_sz; lu++) {
		struct branch *b;

		for (b = branch_table[lu]; b; b = b->table_next_branch)
			if (b->pack_id == id)
				b->pack_id = MAX_PACK_ID;
	}

	for (t = first_tag; t; t = t->next_tag)
		if (t->pack_id == id)
			t->pack_id = MAX_PACK_ID;
}

static unsigned int hc_str(const char *s, size_t len)
{
	unsigned int r = 0;
	while (len-- > 0)
		r = r * 31 + *s++;
	return r;
}

static char *pool_strdup(const char *s)
{
	size_t len = strlen(s) + 1;
	char *r = mem_pool_alloc(&fi_mem_pool, len);
	memcpy(r, s, len);
	return r;
}

static void insert_mark(uintmax_t idnum, struct object_entry *oe)
{
	struct mark_set *s = marks;
	while ((idnum >> s->shift) >= 1024) {
		s = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct mark_set));
		s->shift = marks->shift + 10;
		s->data.sets[0] = marks;
		marks = s;
	}
	while (s->shift) {
		uintmax_t i = idnum >> s->shift;
		idnum -= i << s->shift;
		if (!s->data.sets[i]) {
			s->data.sets[i] = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct mark_set));
			s->data.sets[i]->shift = s->shift - 10;
		}
		s = s->data.sets[i];
	}
	if (!s->data.marked[idnum])
		marks_set_count++;
	s->data.marked[idnum] = oe;
}

static struct object_entry *find_mark(uintmax_t idnum)
{
	uintmax_t orig_idnum = idnum;
	struct mark_set *s = marks;
	struct object_entry *oe = NULL;
	if ((idnum >> s->shift) < 1024) {
		while (s && s->shift) {
			uintmax_t i = idnum >> s->shift;
			idnum -= i << s->shift;
			s = s->data.sets[i];
		}
		if (s)
			oe = s->data.marked[idnum];
	}
	if (!oe)
		die("mark :%" PRIuMAX " not declared", orig_idnum);
	return oe;
}

static struct atom_str *to_atom(const char *s, unsigned short len)
{
	unsigned int hc = hc_str(s, len) % atom_table_sz;
	struct atom_str *c;

	for (c = atom_table[hc]; c; c = c->next_atom)
		if (c->str_len == len && !strncmp(s, c->str_dat, len))
			return c;

	c = mem_pool_alloc(&fi_mem_pool, sizeof(struct atom_str) + len + 1);
	c->str_len = len;
	memcpy(c->str_dat, s, len);
	c->str_dat[len] = 0;
	c->next_atom = atom_table[hc];
	atom_table[hc] = c;
	atom_cnt++;
	return c;
}

static struct branch *lookup_branch(const char *name)
{
	unsigned int hc = hc_str(name, strlen(name)) % branch_table_sz;
	struct branch *b;

	for (b = branch_table[hc]; b; b = b->table_next_branch)
		if (!strcmp(name, b->name))
			return b;
	return NULL;
}

static struct branch *new_branch(const char *name)
{
	unsigned int hc = hc_str(name, strlen(name)) % branch_table_sz;
	struct branch *b = lookup_branch(name);

	if (b)
		die("Invalid attempt to create duplicate branch: %s", name);
	if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL))
		die("Branch name doesn't conform to GIT standards: %s", name);

	b = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct branch));
	b->name = pool_strdup(name);
	b->table_next_branch = branch_table[hc];
	b->branch_tree.versions[0].mode = S_IFDIR;
	b->branch_tree.versions[1].mode = S_IFDIR;
	b->num_notes = 0;
	b->active = 0;
	b->pack_id = MAX_PACK_ID;
	branch_table[hc] = b;
	branch_count++;
	return b;
}

static unsigned int hc_entries(unsigned int cnt)
{
	cnt = cnt & 7 ? (cnt / 8) + 1 : cnt / 8;
	return cnt < avail_tree_table_sz ? cnt : avail_tree_table_sz - 1;
}

static struct tree_content *new_tree_content(unsigned int cnt)
{
	struct avail_tree_content *f, *l = NULL;
	struct tree_content *t;
	unsigned int hc = hc_entries(cnt);

	for (f = avail_tree_table[hc]; f; l = f, f = f->next_avail)
		if (f->entry_capacity >= cnt)
			break;

	if (f) {
		if (l)
			l->next_avail = f->next_avail;
		else
			avail_tree_table[hc] = f->next_avail;
	} else {
		cnt = cnt & 7 ? ((cnt / 8) + 1) * 8 : cnt;
		f = mem_pool_alloc(&fi_mem_pool, sizeof(*t) + sizeof(t->entries[0]) * cnt);
		f->entry_capacity = cnt;
	}

	t = (struct tree_content*)f;
	t->entry_count = 0;
	t->delta_depth = 0;
	return t;
}

static void release_tree_entry(struct tree_entry *e);
static void release_tree_content(struct tree_content *t)
{
	struct avail_tree_content *f = (struct avail_tree_content*)t;
	unsigned int hc = hc_entries(f->entry_capacity);
	f->next_avail = avail_tree_table[hc];
	avail_tree_table[hc] = f;
}

static void release_tree_content_recursive(struct tree_content *t)
{
	unsigned int i;
	for (i = 0; i < t->entry_count; i++)
		release_tree_entry(t->entries[i]);
	release_tree_content(t);
}

static struct tree_content *grow_tree_content(
	struct tree_content *t,
	int amt)
{
	struct tree_content *r = new_tree_content(t->entry_count + amt);
	r->entry_count = t->entry_count;
	r->delta_depth = t->delta_depth;
	memcpy(r->entries,t->entries,t->entry_count*sizeof(t->entries[0]));
	release_tree_content(t);
	return r;
}

static struct tree_entry *new_tree_entry(void)
{
	struct tree_entry *e;

	if (!avail_tree_entry) {
		unsigned int n = tree_entry_alloc;
		tree_entry_allocd += n * sizeof(struct tree_entry);
		ALLOC_ARRAY(e, n);
		avail_tree_entry = e;
		while (n-- > 1) {
			*((void**)e) = e + 1;
			e++;
		}
		*((void**)e) = NULL;
	}

	e = avail_tree_entry;
	avail_tree_entry = *((void**)e);
	return e;
}

static void release_tree_entry(struct tree_entry *e)
{
	if (e->tree)
		release_tree_content_recursive(e->tree);
	*((void**)e) = avail_tree_entry;
	avail_tree_entry = e;
}

static struct tree_content *dup_tree_content(struct tree_content *s)
{
	struct tree_content *d;
	struct tree_entry *a, *b;
	unsigned int i;

	if (!s)
		return NULL;
	d = new_tree_content(s->entry_count);
	for (i = 0; i < s->entry_count; i++) {
		a = s->entries[i];
		b = new_tree_entry();
		memcpy(b, a, sizeof(*a));
		if (a->tree && is_null_oid(&b->versions[1].oid))
			b->tree = dup_tree_content(a->tree);
		else
			b->tree = NULL;
		d->entries[i] = b;
	}
	d->entry_count = s->entry_count;
	d->delta_depth = s->delta_depth;

	return d;
}

static void start_packfile(void)
{
	struct strbuf tmp_file = STRBUF_INIT;
	struct packed_git *p;
	struct pack_header hdr;
	int pack_fd;

	pack_fd = odb_mkstemp(&tmp_file, "pack/tmp_pack_XXXXXX");
	FLEX_ALLOC_STR(p, pack_name, tmp_file.buf);
	strbuf_release(&tmp_file);

	p->pack_fd = pack_fd;
	p->do_not_close = 1;
	pack_file = hashfd(pack_fd, p->pack_name);

	hdr.hdr_signature = htonl(PACK_SIGNATURE);
	hdr.hdr_version = htonl(2);
	hdr.hdr_entries = 0;
	hashwrite(pack_file, &hdr, sizeof(hdr));

	pack_data = p;
	pack_size = sizeof(hdr);
	object_count = 0;

	REALLOC_ARRAY(all_packs, pack_id + 1);
	all_packs[pack_id] = p;
}

static const char *create_index(void)
{
	const char *tmpfile;
	struct pack_idx_entry **idx, **c, **last;
	struct object_entry *e;
	struct object_entry_pool *o;

	/* Build the table of object IDs. */
	ALLOC_ARRAY(idx, object_count);
	c = idx;
	for (o = blocks; o; o = o->next_pool)
		for (e = o->next_free; e-- != o->entries;)
			if (pack_id == e->pack_id)
				*c++ = &e->idx;
	last = idx + object_count;
	if (c != last)
		die("internal consistency error creating the index");

	tmpfile = write_idx_file(NULL, idx, object_count, &pack_idx_opts, pack_data->sha1);
	free(idx);
	return tmpfile;
}

static char *keep_pack(const char *curr_index_name)
{
	static const char *keep_msg = "fast-import";
	struct strbuf name = STRBUF_INIT;
	int keep_fd;

	odb_pack_name(&name, pack_data->sha1, "keep");
	keep_fd = odb_pack_keep(name.buf);
	if (keep_fd < 0)
		die_errno("cannot create keep file");
	write_or_die(keep_fd, keep_msg, strlen(keep_msg));
	if (close(keep_fd))
		die_errno("failed to write keep file");

	odb_pack_name(&name, pack_data->sha1, "pack");
	if (finalize_object_file(pack_data->pack_name, name.buf))
		die("cannot store pack file");

	odb_pack_name(&name, pack_data->sha1, "idx");
	if (finalize_object_file(curr_index_name, name.buf))
		die("cannot store index file");
	free((void *)curr_index_name);
	return strbuf_detach(&name, NULL);
}

static void unkeep_all_packs(void)
{
	struct strbuf name = STRBUF_INIT;
	int k;

	for (k = 0; k < pack_id; k++) {
		struct packed_git *p = all_packs[k];
		odb_pack_name(&name, p->sha1, "keep");
		unlink_or_warn(name.buf);
	}
	strbuf_release(&name);
}

static int loosen_small_pack(const struct packed_git *p)
{
	struct child_process unpack = CHILD_PROCESS_INIT;

	if (lseek(p->pack_fd, 0, SEEK_SET) < 0)
		die_errno("Failed seeking to start of '%s'", p->pack_name);

	unpack.in = p->pack_fd;
	unpack.git_cmd = 1;
	unpack.stdout_to_stderr = 1;
	argv_array_push(&unpack.args, "unpack-objects");
	if (!show_stats)
		argv_array_push(&unpack.args, "-q");

	return run_command(&unpack);
}

static void end_packfile(void)
{
	static int running;

	if (running || !pack_data)
		return;

	running = 1;
	clear_delta_base_cache();
	if (object_count) {
		struct packed_git *new_p;
		struct object_id cur_pack_oid;
		char *idx_name;
		int i;
		struct branch *b;
		struct tag *t;

		close_pack_windows(pack_data);
		finalize_hashfile(pack_file, cur_pack_oid.hash, 0);
		fixup_pack_header_footer(pack_data->pack_fd, pack_data->sha1,
				    pack_data->pack_name, object_count,
				    cur_pack_oid.hash, pack_size);

		if (object_count <= unpack_limit) {
			if (!loosen_small_pack(pack_data)) {
				invalidate_pack_id(pack_id);
				goto discard_pack;
			}
		}

		close(pack_data->pack_fd);
		idx_name = keep_pack(create_index());

		/* Register the packfile with core git's machinery. */
		new_p = add_packed_git(idx_name, strlen(idx_name), 1);
		if (!new_p)
			die("core git rejected index %s", idx_name);
		all_packs[pack_id] = new_p;
		install_packed_git(the_repository, new_p);
		free(idx_name);

		/* Print the boundary */
		if (pack_edges) {
			fprintf(pack_edges, "%s:", new_p->pack_name);
			for (i = 0; i < branch_table_sz; i++) {
				for (b = branch_table[i]; b; b = b->table_next_branch) {
					if (b->pack_id == pack_id)
						fprintf(pack_edges, " %s",
							oid_to_hex(&b->oid));
				}
			}
			for (t = first_tag; t; t = t->next_tag) {
				if (t->pack_id == pack_id)
					fprintf(pack_edges, " %s",
						oid_to_hex(&t->oid));
			}
			fputc('\n', pack_edges);
			fflush(pack_edges);
		}

		pack_id++;
	}
	else {
discard_pack:
		close(pack_data->pack_fd);
		unlink_or_warn(pack_data->pack_name);
	}
	FREE_AND_NULL(pack_data);
	running = 0;

	/* We can't carry a delta across packfiles. */
	strbuf_release(&last_blob.data);
	last_blob.offset = 0;
	last_blob.depth = 0;
}

static void cycle_packfile(void)
{
	end_packfile();
	start_packfile();
}

static int store_object(
	enum object_type type,
	struct strbuf *dat,
	struct last_object *last,
	struct object_id *oidout,
	uintmax_t mark)
{
	void *out, *delta;
	struct object_entry *e;
	unsigned char hdr[96];
	struct object_id oid;
	unsigned long hdrlen, deltalen;
	git_hash_ctx c;
	git_zstream s;

	hdrlen = xsnprintf((char *)hdr, sizeof(hdr), "%s %lu",
			   type_name(type), (unsigned long)dat->len) + 1;
	the_hash_algo->init_fn(&c);
	the_hash_algo->update_fn(&c, hdr, hdrlen);
	the_hash_algo->update_fn(&c, dat->buf, dat->len);
	the_hash_algo->final_fn(oid.hash, &c);
	if (oidout)
		oidcpy(oidout, &oid);

	e = insert_object(&oid);
	if (mark)
		insert_mark(mark, e);
	if (e->idx.offset) {
		duplicate_count_by_type[type]++;
		return 1;
	} else if (find_sha1_pack(oid.hash,
				  get_all_packs(the_repository))) {
		e->type = type;
		e->pack_id = MAX_PACK_ID;
		e->idx.offset = 1; /* just not zero! */
		duplicate_count_by_type[type]++;
		return 1;
	}

	if (last && last->data.len && last->data.buf && last->depth < max_depth
		&& dat->len > the_hash_algo->rawsz) {

		delta_count_attempts_by_type[type]++;
		delta = diff_delta(last->data.buf, last->data.len,
			dat->buf, dat->len,
			&deltalen, dat->len - the_hash_algo->rawsz);
	} else
		delta = NULL;

	git_deflate_init(&s, pack_compression_level);
	if (delta) {
		s.next_in = delta;
		s.avail_in = deltalen;
	} else {
		s.next_in = (void *)dat->buf;
		s.avail_in = dat->len;
	}
	s.avail_out = git_deflate_bound(&s, s.avail_in);
	s.next_out = out = xmalloc(s.avail_out);
	while (git_deflate(&s, Z_FINISH) == Z_OK)
		; /* nothing */
	git_deflate_end(&s);

	/* Determine if we should auto-checkpoint. */
	if ((max_packsize && (pack_size + 60 + s.total_out) > max_packsize)
		|| (pack_size + 60 + s.total_out) < pack_size) {

		/* This new object needs to *not* have the current pack_id. */
		e->pack_id = pack_id + 1;
		cycle_packfile();

		/* We cannot carry a delta into the new pack. */
		if (delta) {
			FREE_AND_NULL(delta);

			git_deflate_init(&s, pack_compression_level);
			s.next_in = (void *)dat->buf;
			s.avail_in = dat->len;
			s.avail_out = git_deflate_bound(&s, s.avail_in);
			s.next_out = out = xrealloc(out, s.avail_out);
			while (git_deflate(&s, Z_FINISH) == Z_OK)
				; /* nothing */
			git_deflate_end(&s);
		}
	}

	e->type = type;
	e->pack_id = pack_id;
	e->idx.offset = pack_size;
	object_count++;
	object_count_by_type[type]++;

	crc32_begin(pack_file);

	if (delta) {
		off_t ofs = e->idx.offset - last->offset;
		unsigned pos = sizeof(hdr) - 1;

		delta_count_by_type[type]++;
		e->depth = last->depth + 1;

		hdrlen = encode_in_pack_object_header(hdr, sizeof(hdr),
						      OBJ_OFS_DELTA, deltalen);
		hashwrite(pack_file, hdr, hdrlen);
		pack_size += hdrlen;

		hdr[pos] = ofs & 127;
		while (ofs >>= 7)
			hdr[--pos] = 128 | (--ofs & 127);
		hashwrite(pack_file, hdr + pos, sizeof(hdr) - pos);
		pack_size += sizeof(hdr) - pos;
	} else {
		e->depth = 0;
		hdrlen = encode_in_pack_object_header(hdr, sizeof(hdr),
						      type, dat->len);
		hashwrite(pack_file, hdr, hdrlen);
		pack_size += hdrlen;
	}

	hashwrite(pack_file, out, s.total_out);
	pack_size += s.total_out;

	e->idx.crc32 = crc32_end(pack_file);

	free(out);
	free(delta);
	if (last) {
		if (last->no_swap) {
			last->data = *dat;
		} else {
			strbuf_swap(&last->data, dat);
		}
		last->offset = e->idx.offset;
		last->depth = e->depth;
	}
	return 0;
}

static void truncate_pack(struct hashfile_checkpoint *checkpoint)
{
	if (hashfile_truncate(pack_file, checkpoint))
		die_errno("cannot truncate pack to skip duplicate");
	pack_size = checkpoint->offset;
}

static void stream_blob(uintmax_t len, struct object_id *oidout, uintmax_t mark)
{
	size_t in_sz = 64 * 1024, out_sz = 64 * 1024;
	unsigned char *in_buf = xmalloc(in_sz);
	unsigned char *out_buf = xmalloc(out_sz);
	struct object_entry *e;
	struct object_id oid;
	unsigned long hdrlen;
	off_t offset;
	git_hash_ctx c;
	git_zstream s;
	struct hashfile_checkpoint checkpoint;
	int status = Z_OK;

	/* Determine if we should auto-checkpoint. */
	if ((max_packsize && (pack_size + 60 + len) > max_packsize)
		|| (pack_size + 60 + len) < pack_size)
		cycle_packfile();

	hashfile_checkpoint(pack_file, &checkpoint);
	offset = checkpoint.offset;

	hdrlen = xsnprintf((char *)out_buf, out_sz, "blob %" PRIuMAX, len) + 1;

	the_hash_algo->init_fn(&c);
	the_hash_algo->update_fn(&c, out_buf, hdrlen);

	crc32_begin(pack_file);

	git_deflate_init(&s, pack_compression_level);

	hdrlen = encode_in_pack_object_header(out_buf, out_sz, OBJ_BLOB, len);

	s.next_out = out_buf + hdrlen;
	s.avail_out = out_sz - hdrlen;

	while (status != Z_STREAM_END) {
		if (0 < len && !s.avail_in) {
			size_t cnt = in_sz < len ? in_sz : (size_t)len;
			size_t n = fread(in_buf, 1, cnt, stdin);
			if (!n && feof(stdin))
				die("EOF in data (%" PRIuMAX " bytes remaining)", len);

			the_hash_algo->update_fn(&c, in_buf, n);
			s.next_in = in_buf;
			s.avail_in = n;
			len -= n;
		}

		status = git_deflate(&s, len ? 0 : Z_FINISH);

		if (!s.avail_out || status == Z_STREAM_END) {
			size_t n = s.next_out - out_buf;
			hashwrite(pack_file, out_buf, n);
			pack_size += n;
			s.next_out = out_buf;
			s.avail_out = out_sz;
		}

		switch (status) {
		case Z_OK:
		case Z_BUF_ERROR:
		case Z_STREAM_END:
			continue;
		default:
			die("unexpected deflate failure: %d", status);
		}
	}
	git_deflate_end(&s);
	the_hash_algo->final_fn(oid.hash, &c);

	if (oidout)
		oidcpy(oidout, &oid);

	e = insert_object(&oid);

	if (mark)
		insert_mark(mark, e);

	if (e->idx.offset) {
		duplicate_count_by_type[OBJ_BLOB]++;
		truncate_pack(&checkpoint);

	} else if (find_sha1_pack(oid.hash,
				  get_all_packs(the_repository))) {
		e->type = OBJ_BLOB;
		e->pack_id = MAX_PACK_ID;
		e->idx.offset = 1; /* just not zero! */
		duplicate_count_by_type[OBJ_BLOB]++;
		truncate_pack(&checkpoint);

	} else {
		e->depth = 0;
		e->type = OBJ_BLOB;
		e->pack_id = pack_id;
		e->idx.offset = offset;
		e->idx.crc32 = crc32_end(pack_file);
		object_count++;
		object_count_by_type[OBJ_BLOB]++;
	}

	free(in_buf);
	free(out_buf);
}

/* All calls must be guarded by find_object() or find_mark() to
 * ensure the 'struct object_entry' passed was written by this
 * process instance.  We unpack the entry by the offset, avoiding
 * the need for the corresponding .idx file.  This unpacking rule
 * works because we only use OBJ_REF_DELTA within the packfiles
 * created by fast-import.
 *
 * oe must not be NULL.  Such an oe usually comes from giving
 * an unknown SHA-1 to find_object() or an undefined mark to
 * find_mark().  Callers must test for this condition and use
 * the standard read_sha1_file() when it happens.
 *
 * oe->pack_id must not be MAX_PACK_ID.  Such an oe is usually from
 * find_mark(), where the mark was reloaded from an existing marks
 * file and is referencing an object that this fast-import process
 * instance did not write out to a packfile.  Callers must test for
 * this condition and use read_sha1_file() instead.
 */
static void *gfi_unpack_entry(
	struct object_entry *oe,
	unsigned long *sizep)
{
	enum object_type type;
	struct packed_git *p = all_packs[oe->pack_id];
	if (p == pack_data && p->pack_size < (pack_size + the_hash_algo->rawsz)) {
		/* The object is stored in the packfile we are writing to
		 * and we have modified it since the last time we scanned
		 * back to read a previously written object.  If an old
		 * window covered [p->pack_size, p->pack_size + rawsz) its
		 * data is stale and is not valid.  Closing all windows
		 * and updating the packfile length ensures we can read
		 * the newly written data.
		 */
		close_pack_windows(p);
		hashflush(pack_file);

		/* We have to offer rawsz bytes additional on the end of
		 * the packfile as the core unpacker code assumes the
		 * footer is present at the file end and must promise
		 * at least rawsz bytes within any window it maps.  But
		 * we don't actually create the footer here.
		 */
		p->pack_size = pack_size + the_hash_algo->rawsz;
	}
	return unpack_entry(the_repository, p, oe->idx.offset, &type, sizep);
}

static const char *get_mode(const char *str, uint16_t *modep)
{
	unsigned char c;
	uint16_t mode = 0;

	while ((c = *str++) != ' ') {
		if (c < '0' || c > '7')
			return NULL;
		mode = (mode << 3) + (c - '0');
	}
	*modep = mode;
	return str;
}

static void load_tree(struct tree_entry *root)
{
	struct object_id *oid = &root->versions[1].oid;
	struct object_entry *myoe;
	struct tree_content *t;
	unsigned long size;
	char *buf;
	const char *c;

	root->tree = t = new_tree_content(8);
	if (is_null_oid(oid))
		return;

	myoe = find_object(oid);
	if (myoe && myoe->pack_id != MAX_PACK_ID) {
		if (myoe->type != OBJ_TREE)
			die("Not a tree: %s", oid_to_hex(oid));
		t->delta_depth = myoe->depth;
		buf = gfi_unpack_entry(myoe, &size);
		if (!buf)
			die("Can't load tree %s", oid_to_hex(oid));
	} else {
		enum object_type type;
		buf = read_object_file(oid, &type, &size);
		if (!buf || type != OBJ_TREE)
			die("Can't load tree %s", oid_to_hex(oid));
	}

	c = buf;
	while (c != (buf + size)) {
		struct tree_entry *e = new_tree_entry();

		if (t->entry_count == t->entry_capacity)
			root->tree = t = grow_tree_content(t, t->entry_count);
		t->entries[t->entry_count++] = e;

		e->tree = NULL;
		c = get_mode(c, &e->versions[1].mode);
		if (!c)
			die("Corrupt mode in %s", oid_to_hex(oid));
		e->versions[0].mode = e->versions[1].mode;
		e->name = to_atom(c, strlen(c));
		c += e->name->str_len + 1;
		hashcpy(e->versions[0].oid.hash, (unsigned char *)c);
		hashcpy(e->versions[1].oid.hash, (unsigned char *)c);
		c += GIT_SHA1_RAWSZ;
	}
	free(buf);
}

static int tecmp0 (const void *_a, const void *_b)
{
	struct tree_entry *a = *((struct tree_entry**)_a);
	struct tree_entry *b = *((struct tree_entry**)_b);
	return base_name_compare(
		a->name->str_dat, a->name->str_len, a->versions[0].mode,
		b->name->str_dat, b->name->str_len, b->versions[0].mode);
}

static int tecmp1 (const void *_a, const void *_b)
{
	struct tree_entry *a = *((struct tree_entry**)_a);
	struct tree_entry *b = *((struct tree_entry**)_b);
	return base_name_compare(
		a->name->str_dat, a->name->str_len, a->versions[1].mode,
		b->name->str_dat, b->name->str_len, b->versions[1].mode);
}

static void mktree(struct tree_content *t, int v, struct strbuf *b)
{
	size_t maxlen = 0;
	unsigned int i;

	if (!v)
		QSORT(t->entries, t->entry_count, tecmp0);
	else
		QSORT(t->entries, t->entry_count, tecmp1);

	for (i = 0; i < t->entry_count; i++) {
		if (t->entries[i]->versions[v].mode)
			maxlen += t->entries[i]->name->str_len + 34;
	}

	strbuf_reset(b);
	strbuf_grow(b, maxlen);
	for (i = 0; i < t->entry_count; i++) {
		struct tree_entry *e = t->entries[i];
		if (!e->versions[v].mode)
			continue;
		strbuf_addf(b, "%o %s%c",
			(unsigned int)(e->versions[v].mode & ~NO_DELTA),
			e->name->str_dat, '\0');
		strbuf_add(b, e->versions[v].oid.hash, GIT_SHA1_RAWSZ);
	}
}

static void store_tree(struct tree_entry *root)
{
	struct tree_content *t;
	unsigned int i, j, del;
	struct last_object lo = { STRBUF_INIT, 0, 0, /* no_swap */ 1 };
	struct object_entry *le = NULL;

	if (!is_null_oid(&root->versions[1].oid))
		return;

	if (!root->tree)
		load_tree(root);
	t = root->tree;

	for (i = 0; i < t->entry_count; i++) {
		if (t->entries[i]->tree)
			store_tree(t->entries[i]);
	}

	if (!(root->versions[0].mode & NO_DELTA))
		le = find_object(&root->versions[0].oid);
	if (S_ISDIR(root->versions[0].mode) && le && le->pack_id == pack_id) {
		mktree(t, 0, &old_tree);
		lo.data = old_tree;
		lo.offset = le->idx.offset;
		lo.depth = t->delta_depth;
	}

	mktree(t, 1, &new_tree);
	store_object(OBJ_TREE, &new_tree, &lo, &root->versions[1].oid, 0);

	t->delta_depth = lo.depth;
	for (i = 0, j = 0, del = 0; i < t->entry_count; i++) {
		struct tree_entry *e = t->entries[i];
		if (e->versions[1].mode) {
			e->versions[0].mode = e->versions[1].mode;
			oidcpy(&e->versions[0].oid, &e->versions[1].oid);
			t->entries[j++] = e;
		} else {
			release_tree_entry(e);
			del++;
		}
	}
	t->entry_count -= del;
}

static void tree_content_replace(
	struct tree_entry *root,
	const struct object_id *oid,
	const uint16_t mode,
	struct tree_content *newtree)
{
	if (!S_ISDIR(mode))
		die("Root cannot be a non-directory");
	oidclr(&root->versions[0].oid);
	oidcpy(&root->versions[1].oid, oid);
	if (root->tree)
		release_tree_content_recursive(root->tree);
	root->tree = newtree;
}

static int tree_content_set(
	struct tree_entry *root,
	const char *p,
	const struct object_id *oid,
	const uint16_t mode,
	struct tree_content *subtree)
{
	struct tree_content *t;
	const char *slash1;
	unsigned int i, n;
	struct tree_entry *e;

	slash1 = strchrnul(p, '/');
	n = slash1 - p;
	if (!n)
		die("Empty path component found in input");
	if (!*slash1 && !S_ISDIR(mode) && subtree)
		die("Non-directories cannot have subtrees");

	if (!root->tree)
		load_tree(root);
	t = root->tree;
	for (i = 0; i < t->entry_count; i++) {
		e = t->entries[i];
		if (e->name->str_len == n && !fspathncmp(p, e->name->str_dat, n)) {
			if (!*slash1) {
				if (!S_ISDIR(mode)
						&& e->versions[1].mode == mode
						&& oideq(&e->versions[1].oid, oid))
					return 0;
				e->versions[1].mode = mode;
				oidcpy(&e->versions[1].oid, oid);
				if (e->tree)
					release_tree_content_recursive(e->tree);
				e->tree = subtree;

				/*
				 * We need to leave e->versions[0].sha1 alone
				 * to avoid modifying the preimage tree used
				 * when writing out the parent directory.
				 * But after replacing the subdir with a
				 * completely different one, it's not a good
				 * delta base any more, and besides, we've
				 * thrown away the tree entries needed to
				 * make a delta against it.
				 *
				 * So let's just explicitly disable deltas
				 * for the subtree.
				 */
				if (S_ISDIR(e->versions[0].mode))
					e->versions[0].mode |= NO_DELTA;

				oidclr(&root->versions[1].oid);
				return 1;
			}
			if (!S_ISDIR(e->versions[1].mode)) {
				e->tree = new_tree_content(8);
				e->versions[1].mode = S_IFDIR;
			}
			if (!e->tree)
				load_tree(e);
			if (tree_content_set(e, slash1 + 1, oid, mode, subtree)) {
				oidclr(&root->versions[1].oid);
				return 1;
			}
			return 0;
		}
	}

	if (t->entry_count == t->entry_capacity)
		root->tree = t = grow_tree_content(t, t->entry_count);
	e = new_tree_entry();
	e->name = to_atom(p, n);
	e->versions[0].mode = 0;
	oidclr(&e->versions[0].oid);
	t->entries[t->entry_count++] = e;
	if (*slash1) {
		e->tree = new_tree_content(8);
		e->versions[1].mode = S_IFDIR;
		tree_content_set(e, slash1 + 1, oid, mode, subtree);
	} else {
		e->tree = subtree;
		e->versions[1].mode = mode;
		oidcpy(&e->versions[1].oid, oid);
	}
	oidclr(&root->versions[1].oid);
	return 1;
}

static int tree_content_remove(
	struct tree_entry *root,
	const char *p,
	struct tree_entry *backup_leaf,
	int allow_root)
{
	struct tree_content *t;
	const char *slash1;
	unsigned int i, n;
	struct tree_entry *e;

	slash1 = strchrnul(p, '/');
	n = slash1 - p;

	if (!root->tree)
		load_tree(root);

	if (!*p && allow_root) {
		e = root;
		goto del_entry;
	}

	t = root->tree;
	for (i = 0; i < t->entry_count; i++) {
		e = t->entries[i];
		if (e->name->str_len == n && !fspathncmp(p, e->name->str_dat, n)) {
			if (*slash1 && !S_ISDIR(e->versions[1].mode))
				/*
				 * If p names a file in some subdirectory, and a
				 * file or symlink matching the name of the
				 * parent directory of p exists, then p cannot
				 * exist and need not be deleted.
				 */
				return 1;
			if (!*slash1 || !S_ISDIR(e->versions[1].mode))
				goto del_entry;
			if (!e->tree)
				load_tree(e);
			if (tree_content_remove(e, slash1 + 1, backup_leaf, 0)) {
				for (n = 0; n < e->tree->entry_count; n++) {
					if (e->tree->entries[n]->versions[1].mode) {
						oidclr(&root->versions[1].oid);
						return 1;
					}
				}
				backup_leaf = NULL;
				goto del_entry;
			}
			return 0;
		}
	}
	return 0;

del_entry:
	if (backup_leaf)
		memcpy(backup_leaf, e, sizeof(*backup_leaf));
	else if (e->tree)
		release_tree_content_recursive(e->tree);
	e->tree = NULL;
	e->versions[1].mode = 0;
	oidclr(&e->versions[1].oid);
	oidclr(&root->versions[1].oid);
	return 1;
}

static int tree_content_get(
	struct tree_entry *root,
	const char *p,
	struct tree_entry *leaf,
	int allow_root)
{
	struct tree_content *t;
	const char *slash1;
	unsigned int i, n;
	struct tree_entry *e;

	slash1 = strchrnul(p, '/');
	n = slash1 - p;
	if (!n && !allow_root)
		die("Empty path component found in input");

	if (!root->tree)
		load_tree(root);

	if (!n) {
		e = root;
		goto found_entry;
	}

	t = root->tree;
	for (i = 0; i < t->entry_count; i++) {
		e = t->entries[i];
		if (e->name->str_len == n && !fspathncmp(p, e->name->str_dat, n)) {
			if (!*slash1)
				goto found_entry;
			if (!S_ISDIR(e->versions[1].mode))
				return 0;
			if (!e->tree)
				load_tree(e);
			return tree_content_get(e, slash1 + 1, leaf, 0);
		}
	}
	return 0;

found_entry:
	memcpy(leaf, e, sizeof(*leaf));
	if (e->tree && is_null_oid(&e->versions[1].oid))
		leaf->tree = dup_tree_content(e->tree);
	else
		leaf->tree = NULL;
	return 1;
}

static int update_branch(struct branch *b)
{
	static const char *msg = "fast-import";
	struct ref_transaction *transaction;
	struct object_id old_oid;
	struct strbuf err = STRBUF_INIT;

	if (is_null_oid(&b->oid)) {
		if (b->delete)
			delete_ref(NULL, b->name, NULL, 0);
		return 0;
	}
	if (read_ref(b->name, &old_oid))
		oidclr(&old_oid);
	if (!force_update && !is_null_oid(&old_oid)) {
		struct commit *old_cmit, *new_cmit;

		old_cmit = lookup_commit_reference_gently(the_repository,
							  &old_oid, 0);
		new_cmit = lookup_commit_reference_gently(the_repository,
							  &b->oid, 0);
		if (!old_cmit || !new_cmit)
			return error("Branch %s is missing commits.", b->name);

		if (!in_merge_bases(old_cmit, new_cmit)) {
			warning("Not updating %s"
				" (new tip %s does not contain %s)",
				b->name, oid_to_hex(&b->oid),
				oid_to_hex(&old_oid));
			return -1;
		}
	}
	transaction = ref_transaction_begin(&err);
	if (!transaction ||
	    ref_transaction_update(transaction, b->name, &b->oid, &old_oid,
				   0, msg, &err) ||
	    ref_transaction_commit(transaction, &err)) {
		ref_transaction_free(transaction);
		error("%s", err.buf);
		strbuf_release(&err);
		return -1;
	}
	ref_transaction_free(transaction);
	strbuf_release(&err);
	return 0;
}

static void dump_branches(void)
{
	unsigned int i;
	struct branch *b;

	for (i = 0; i < branch_table_sz; i++) {
		for (b = branch_table[i]; b; b = b->table_next_branch)
			failure |= update_branch(b);
	}
}

static void dump_tags(void)
{
	static const char *msg = "fast-import";
	struct tag *t;
	struct strbuf ref_name = STRBUF_INIT;
	struct strbuf err = STRBUF_INIT;
	struct ref_transaction *transaction;

	transaction = ref_transaction_begin(&err);
	if (!transaction) {
		failure |= error("%s", err.buf);
		goto cleanup;
	}
	for (t = first_tag; t; t = t->next_tag) {
		strbuf_reset(&ref_name);
		strbuf_addf(&ref_name, "refs/tags/%s", t->name);

		if (ref_transaction_update(transaction, ref_name.buf,
					   &t->oid, NULL, 0, msg, &err)) {
			failure |= error("%s", err.buf);
			goto cleanup;
		}
	}
	if (ref_transaction_commit(transaction, &err))
		failure |= error("%s", err.buf);

 cleanup:
	ref_transaction_free(transaction);
	strbuf_release(&ref_name);
	strbuf_release(&err);
}

static void dump_marks_helper(FILE *f,
	uintmax_t base,
	struct mark_set *m)
{
	uintmax_t k;
	if (m->shift) {
		for (k = 0; k < 1024; k++) {
			if (m->data.sets[k])
				dump_marks_helper(f, base + (k << m->shift),
					m->data.sets[k]);
		}
	} else {
		for (k = 0; k < 1024; k++) {
			if (m->data.marked[k])
				fprintf(f, ":%" PRIuMAX " %s\n", base + k,
					oid_to_hex(&m->data.marked[k]->idx.oid));
		}
	}
}

static void dump_marks(void)
{
	struct lock_file mark_lock = LOCK_INIT;
	FILE *f;

	if (!export_marks_file || (import_marks_file && !import_marks_file_done))
		return;

	if (safe_create_leading_directories_const(export_marks_file)) {
		failure |= error_errno("unable to create leading directories of %s",
				       export_marks_file);
		return;
	}

	if (hold_lock_file_for_update(&mark_lock, export_marks_file, 0) < 0) {
		failure |= error_errno("Unable to write marks file %s",
				       export_marks_file);
		return;
	}

	f = fdopen_lock_file(&mark_lock, "w");
	if (!f) {
		int saved_errno = errno;
		rollback_lock_file(&mark_lock);
		failure |= error("Unable to write marks file %s: %s",
			export_marks_file, strerror(saved_errno));
		return;
	}

	dump_marks_helper(f, 0, marks);
	if (commit_lock_file(&mark_lock)) {
		failure |= error_errno("Unable to write file %s",
				       export_marks_file);
		return;
	}
}

static void read_marks(void)
{
	char line[512];
	FILE *f = fopen(import_marks_file, "r");
	if (f)
		;
	else if (import_marks_file_ignore_missing && errno == ENOENT)
		goto done; /* Marks file does not exist */
	else
		die_errno("cannot read '%s'", import_marks_file);
	while (fgets(line, sizeof(line), f)) {
		uintmax_t mark;
		char *end;
		struct object_id oid;
		struct object_entry *e;

		end = strchr(line, '\n');
		if (line[0] != ':' || !end)
			die("corrupt mark line: %s", line);
		*end = 0;
		mark = strtoumax(line + 1, &end, 10);
		if (!mark || end == line + 1
			|| *end != ' ' || get_oid_hex(end + 1, &oid))
			die("corrupt mark line: %s", line);
		e = find_object(&oid);
		if (!e) {
			enum object_type type = oid_object_info(the_repository,
								&oid, NULL);
			if (type < 0)
				die("object not found: %s", oid_to_hex(&oid));
			e = insert_object(&oid);
			e->type = type;
			e->pack_id = MAX_PACK_ID;
			e->idx.offset = 1; /* just not zero! */
		}
		insert_mark(mark, e);
	}
	fclose(f);
done:
	import_marks_file_done = 1;
}


static int read_next_command(void)
{
	static int stdin_eof = 0;

	if (stdin_eof) {
		unread_command_buf = 0;
		return EOF;
	}

	for (;;) {
		const char *p;

		if (unread_command_buf) {
			unread_command_buf = 0;
		} else {
			struct recent_command *rc;

			strbuf_detach(&command_buf, NULL);
			stdin_eof = strbuf_getline_lf(&command_buf, stdin);
			if (stdin_eof)
				return EOF;

			if (!seen_data_command
				&& !starts_with(command_buf.buf, "feature ")
				&& !starts_with(command_buf.buf, "option ")) {
				parse_argv();
			}

			rc = rc_free;
			if (rc)
				rc_free = rc->next;
			else {
				rc = cmd_hist.next;
				cmd_hist.next = rc->next;
				cmd_hist.next->prev = &cmd_hist;
				free(rc->buf);
			}

			rc->buf = command_buf.buf;
			rc->prev = cmd_tail;
			rc->next = cmd_hist.prev;
			rc->prev->next = rc;
			cmd_tail = rc;
		}
		if (skip_prefix(command_buf.buf, "get-mark ", &p)) {
			parse_get_mark(p);
			continue;
		}
		if (skip_prefix(command_buf.buf, "cat-blob ", &p)) {
			parse_cat_blob(p);
			continue;
		}
		if (command_buf.buf[0] == '#')
			continue;
		return 0;
	}
}

static void skip_optional_lf(void)
{
	int term_char = fgetc(stdin);
	if (term_char != '\n' && term_char != EOF)
		ungetc(term_char, stdin);
}

static void parse_mark(void)
{
	const char *v;
	if (skip_prefix(command_buf.buf, "mark :", &v)) {
		next_mark = strtoumax(v, NULL, 10);
		read_next_command();
	}
	else
		next_mark = 0;
}

static int parse_data(struct strbuf *sb, uintmax_t limit, uintmax_t *len_res)
{
	const char *data;
	strbuf_reset(sb);

	if (!skip_prefix(command_buf.buf, "data ", &data))
		die("Expected 'data n' command, found: %s", command_buf.buf);

	if (skip_prefix(data, "<<", &data)) {
		char *term = xstrdup(data);
		size_t term_len = command_buf.len - (data - command_buf.buf);

		strbuf_detach(&command_buf, NULL);
		for (;;) {
			if (strbuf_getline_lf(&command_buf, stdin) == EOF)
				die("EOF in data (terminator '%s' not found)", term);
			if (term_len == command_buf.len
				&& !strcmp(term, command_buf.buf))
				break;
			strbuf_addbuf(sb, &command_buf);
			strbuf_addch(sb, '\n');
		}
		free(term);
	}
	else {
		uintmax_t len = strtoumax(data, NULL, 10);
		size_t n = 0, length = (size_t)len;

		if (limit && limit < len) {
			*len_res = len;
			return 0;
		}
		if (length < len)
			die("data is too large to use in this context");

		while (n < length) {
			size_t s = strbuf_fread(sb, length - n, stdin);
			if (!s && feof(stdin))
				die("EOF in data (%lu bytes remaining)",
					(unsigned long)(length - n));
			n += s;
		}
	}

	skip_optional_lf();
	return 1;
}

static int validate_raw_date(const char *src, struct strbuf *result)
{
	const char *orig_src = src;
	char *endp;
	unsigned long num;

	errno = 0;

	num = strtoul(src, &endp, 10);
	/* NEEDSWORK: perhaps check for reasonable values? */
	if (errno || endp == src || *endp != ' ')
		return -1;

	src = endp + 1;
	if (*src != '-' && *src != '+')
		return -1;

	num = strtoul(src + 1, &endp, 10);
	if (errno || endp == src + 1 || *endp || 1400 < num)
		return -1;

	strbuf_addstr(result, orig_src);
	return 0;
}

static char *parse_ident(const char *buf)
{
	const char *ltgt;
	size_t name_len;
	struct strbuf ident = STRBUF_INIT;

	/* ensure there is a space delimiter even if there is no name */
	if (*buf == '<')
		--buf;

	ltgt = buf + strcspn(buf, "<>");
	if (*ltgt != '<')
		die("Missing < in ident string: %s", buf);
	if (ltgt != buf && ltgt[-1] != ' ')
		die("Missing space before < in ident string: %s", buf);
	ltgt = ltgt + 1 + strcspn(ltgt + 1, "<>");
	if (*ltgt != '>')
		die("Missing > in ident string: %s", buf);
	ltgt++;
	if (*ltgt != ' ')
		die("Missing space after > in ident string: %s", buf);
	ltgt++;
	name_len = ltgt - buf;
	strbuf_add(&ident, buf, name_len);

	switch (whenspec) {
	case WHENSPEC_RAW:
		if (validate_raw_date(ltgt, &ident) < 0)
			die("Invalid raw date \"%s\" in ident: %s", ltgt, buf);
		break;
	case WHENSPEC_RFC2822:
		if (parse_date(ltgt, &ident) < 0)
			die("Invalid rfc2822 date \"%s\" in ident: %s", ltgt, buf);
		break;
	case WHENSPEC_NOW:
		if (strcmp("now", ltgt))
			die("Date in ident must be 'now': %s", buf);
		datestamp(&ident);
		break;
	}

	return strbuf_detach(&ident, NULL);
}

static void parse_and_store_blob(
	struct last_object *last,
	struct object_id *oidout,
	uintmax_t mark)
{
	static struct strbuf buf = STRBUF_INIT;
	uintmax_t len;

	if (parse_data(&buf, big_file_threshold, &len))
		store_object(OBJ_BLOB, &buf, last, oidout, mark);
	else {
		if (last) {
			strbuf_release(&last->data);
			last->offset = 0;
			last->depth = 0;
		}
		stream_blob(len, oidout, mark);
		skip_optional_lf();
	}
}

static void parse_new_blob(void)
{
	read_next_command();
	parse_mark();
	parse_and_store_blob(&last_blob, NULL, next_mark);
}

static void unload_one_branch(void)
{
	while (cur_active_branches
		&& cur_active_branches >= max_active_branches) {
		uintmax_t min_commit = ULONG_MAX;
		struct branch *e, *l = NULL, *p = NULL;

		for (e = active_branches; e; e = e->active_next_branch) {
			if (e->last_commit < min_commit) {
				p = l;
				min_commit = e->last_commit;
			}
			l = e;
		}

		if (p) {
			e = p->active_next_branch;
			p->active_next_branch = e->active_next_branch;
		} else {
			e = active_branches;
			active_branches = e->active_next_branch;
		}
		e->active = 0;
		e->active_next_branch = NULL;
		if (e->branch_tree.tree) {
			release_tree_content_recursive(e->branch_tree.tree);
			e->branch_tree.tree = NULL;
		}
		cur_active_branches--;
	}
}

static void load_branch(struct branch *b)
{
	load_tree(&b->branch_tree);
	if (!b->active) {
		b->active = 1;
		b->active_next_branch = active_branches;
		active_branches = b;
		cur_active_branches++;
		branch_load_count++;
	}
}

static unsigned char convert_num_notes_to_fanout(uintmax_t num_notes)
{
	unsigned char fanout = 0;
	while ((num_notes >>= 8))
		fanout++;
	return fanout;
}

static void construct_path_with_fanout(const char *hex_sha1,
		unsigned char fanout, char *path)
{
	unsigned int i = 0, j = 0;
	if (fanout >= the_hash_algo->rawsz)
		die("Too large fanout (%u)", fanout);
	while (fanout) {
		path[i++] = hex_sha1[j++];
		path[i++] = hex_sha1[j++];
		path[i++] = '/';
		fanout--;
	}
	memcpy(path + i, hex_sha1 + j, the_hash_algo->hexsz - j);
	path[i + the_hash_algo->hexsz - j] = '\0';
}

static uintmax_t do_change_note_fanout(
		struct tree_entry *orig_root, struct tree_entry *root,
		char *hex_oid, unsigned int hex_oid_len,
		char *fullpath, unsigned int fullpath_len,
		unsigned char fanout)
{
	struct tree_content *t;
	struct tree_entry *e, leaf;
	unsigned int i, tmp_hex_oid_len, tmp_fullpath_len;
	uintmax_t num_notes = 0;
	struct object_id oid;
	char realpath[60];

	if (!root->tree)
		load_tree(root);
	t = root->tree;

	for (i = 0; t && i < t->entry_count; i++) {
		e = t->entries[i];
		tmp_hex_oid_len = hex_oid_len + e->name->str_len;
		tmp_fullpath_len = fullpath_len;

		/*
		 * We're interested in EITHER existing note entries (entries
		 * with exactly 40 hex chars in path, not including directory
		 * separators), OR directory entries that may contain note
		 * entries (with < 40 hex chars in path).
		 * Also, each path component in a note entry must be a multiple
		 * of 2 chars.
		 */
		if (!e->versions[1].mode ||
		    tmp_hex_oid_len > GIT_SHA1_HEXSZ ||
		    e->name->str_len % 2)
			continue;

		/* This _may_ be a note entry, or a subdir containing notes */
		memcpy(hex_oid + hex_oid_len, e->name->str_dat,
		       e->name->str_len);
		if (tmp_fullpath_len)
			fullpath[tmp_fullpath_len++] = '/';
		memcpy(fullpath + tmp_fullpath_len, e->name->str_dat,
		       e->name->str_len);
		tmp_fullpath_len += e->name->str_len;
		fullpath[tmp_fullpath_len] = '\0';

		if (tmp_hex_oid_len == GIT_SHA1_HEXSZ && !get_oid_hex(hex_oid, &oid)) {
			/* This is a note entry */
			if (fanout == 0xff) {
				/* Counting mode, no rename */
				num_notes++;
				continue;
			}
			construct_path_with_fanout(hex_oid, fanout, realpath);
			if (!strcmp(fullpath, realpath)) {
				/* Note entry is in correct location */
				num_notes++;
				continue;
			}

			/* Rename fullpath to realpath */
			if (!tree_content_remove(orig_root, fullpath, &leaf, 0))
				die("Failed to remove path %s", fullpath);
			tree_content_set(orig_root, realpath,
				&leaf.versions[1].oid,
				leaf.versions[1].mode,
				leaf.tree);
		} else if (S_ISDIR(e->versions[1].mode)) {
			/* This is a subdir that may contain note entries */
			num_notes += do_change_note_fanout(orig_root, e,
				hex_oid, tmp_hex_oid_len,
				fullpath, tmp_fullpath_len, fanout);
		}

		/* The above may have reallocated the current tree_content */
		t = root->tree;
	}
	return num_notes;
}

static uintmax_t change_note_fanout(struct tree_entry *root,
		unsigned char fanout)
{
	/*
	 * The size of path is due to one slash between every two hex digits,
	 * plus the terminating NUL.  Note that there is no slash at the end, so
	 * the number of slashes is one less than half the number of hex
	 * characters.
	 */
	char hex_oid[GIT_MAX_HEXSZ], path[GIT_MAX_HEXSZ + (GIT_MAX_HEXSZ / 2) - 1 + 1];
	return do_change_note_fanout(root, root, hex_oid, 0, path, 0, fanout);
}

/*
 * Given a pointer into a string, parse a mark reference:
 *
 *   idnum ::= ':' bigint;
 *
 * Return the first character after the value in *endptr.
 *
 * Complain if the following character is not what is expected,
 * either a space or end of the string.
 */
static uintmax_t parse_mark_ref(const char *p, char **endptr)
{
	uintmax_t mark;

	assert(*p == ':');
	p++;
	mark = strtoumax(p, endptr, 10);
	if (*endptr == p)
		die("No value after ':' in mark: %s", command_buf.buf);
	return mark;
}

/*
 * Parse the mark reference, and complain if this is not the end of
 * the string.
 */
static uintmax_t parse_mark_ref_eol(const char *p)
{
	char *end;
	uintmax_t mark;

	mark = parse_mark_ref(p, &end);
	if (*end != '\0')
		die("Garbage after mark: %s", command_buf.buf);
	return mark;
}

/*
 * Parse the mark reference, demanding a trailing space.  Return a
 * pointer to the space.
 */
static uintmax_t parse_mark_ref_space(const char **p)
{
	uintmax_t mark;
	char *end;

	mark = parse_mark_ref(*p, &end);
	if (*end++ != ' ')
		die("Missing space after mark: %s", command_buf.buf);
	*p = end;
	return mark;
}

static void file_change_m(const char *p, struct branch *b)
{
	static struct strbuf uq = STRBUF_INIT;
	const char *endp;
	struct object_entry *oe;
	struct object_id oid;
	uint16_t mode, inline_data = 0;

	p = get_mode(p, &mode);
	if (!p)
		die("Corrupt mode: %s", command_buf.buf);
	switch (mode) {
	case 0644:
	case 0755:
		mode |= S_IFREG;
	case S_IFREG | 0644:
	case S_IFREG | 0755:
	case S_IFLNK:
	case S_IFDIR:
	case S_IFGITLINK:
		/* ok */
		break;
	default:
		die("Corrupt mode: %s", command_buf.buf);
	}

	if (*p == ':') {
		oe = find_mark(parse_mark_ref_space(&p));
		oidcpy(&oid, &oe->idx.oid);
	} else if (skip_prefix(p, "inline ", &p)) {
		inline_data = 1;
		oe = NULL; /* not used with inline_data, but makes gcc happy */
	} else {
		if (parse_oid_hex(p, &oid, &p))
			die("Invalid dataref: %s", command_buf.buf);
		oe = find_object(&oid);
		if (*p++ != ' ')
			die("Missing space after SHA1: %s", command_buf.buf);
	}

	strbuf_reset(&uq);
	if (!unquote_c_style(&uq, p, &endp)) {
		if (*endp)
			die("Garbage after path in: %s", command_buf.buf);
		p = uq.buf;
	}

	/* Git does not track empty, non-toplevel directories. */
	if (S_ISDIR(mode) && is_empty_tree_oid(&oid) && *p) {
		tree_content_remove(&b->branch_tree, p, NULL, 0);
		return;
	}

	if (S_ISGITLINK(mode)) {
		if (inline_data)
			die("Git links cannot be specified 'inline': %s",
				command_buf.buf);
		else if (oe) {
			if (oe->type != OBJ_COMMIT)
				die("Not a commit (actually a %s): %s",
					type_name(oe->type), command_buf.buf);
		}
		/*
		 * Accept the sha1 without checking; it expected to be in
		 * another repository.
		 */
	} else if (inline_data) {
		if (S_ISDIR(mode))
			die("Directories cannot be specified 'inline': %s",
				command_buf.buf);
		if (p != uq.buf) {
			strbuf_addstr(&uq, p);
			p = uq.buf;
		}
		read_next_command();
		parse_and_store_blob(&last_blob, &oid, 0);
	} else {
		enum object_type expected = S_ISDIR(mode) ?
						OBJ_TREE: OBJ_BLOB;
		enum object_type type = oe ? oe->type :
					oid_object_info(the_repository, &oid,
							NULL);
		if (type < 0)
			die("%s not found: %s",
					S_ISDIR(mode) ?  "Tree" : "Blob",
					command_buf.buf);
		if (type != expected)
			die("Not a %s (actually a %s): %s",
				type_name(expected), type_name(type),
				command_buf.buf);
	}

	if (!*p) {
		tree_content_replace(&b->branch_tree, &oid, mode, NULL);
		return;
	}
	tree_content_set(&b->branch_tree, p, &oid, mode, NULL);
}

static void file_change_d(const char *p, struct branch *b)
{
	static struct strbuf uq = STRBUF_INIT;
	const char *endp;

	strbuf_reset(&uq);
	if (!unquote_c_style(&uq, p, &endp)) {
		if (*endp)
			die("Garbage after path in: %s", command_buf.buf);
		p = uq.buf;
	}
	tree_content_remove(&b->branch_tree, p, NULL, 1);
}

static void file_change_cr(const char *s, struct branch *b, int rename)
{
	const char *d;
	static struct strbuf s_uq = STRBUF_INIT;
	static struct strbuf d_uq = STRBUF_INIT;
	const char *endp;
	struct tree_entry leaf;

	strbuf_reset(&s_uq);
	if (!unquote_c_style(&s_uq, s, &endp)) {
		if (*endp != ' ')
			die("Missing space after source: %s", command_buf.buf);
	} else {
		endp = strchr(s, ' ');
		if (!endp)
			die("Missing space after source: %s", command_buf.buf);
		strbuf_add(&s_uq, s, endp - s);
	}
	s = s_uq.buf;

	endp++;
	if (!*endp)
		die("Missing dest: %s", command_buf.buf);

	d = endp;
	strbuf_reset(&d_uq);
	if (!unquote_c_style(&d_uq, d, &endp)) {
		if (*endp)
			die("Garbage after dest in: %s", command_buf.buf);
		d = d_uq.buf;
	}

	memset(&leaf, 0, sizeof(leaf));
	if (rename)
		tree_content_remove(&b->branch_tree, s, &leaf, 1);
	else
		tree_content_get(&b->branch_tree, s, &leaf, 1);
	if (!leaf.versions[1].mode)
		die("Path %s not in branch", s);
	if (!*d) {	/* C "path/to/subdir" "" */
		tree_content_replace(&b->branch_tree,
			&leaf.versions[1].oid,
			leaf.versions[1].mode,
			leaf.tree);
		return;
	}
	tree_content_set(&b->branch_tree, d,
		&leaf.versions[1].oid,
		leaf.versions[1].mode,
		leaf.tree);
}

static void note_change_n(const char *p, struct branch *b, unsigned char *old_fanout)
{
	static struct strbuf uq = STRBUF_INIT;
	struct object_entry *oe;
	struct branch *s;
	struct object_id oid, commit_oid;
	char path[60];
	uint16_t inline_data = 0;
	unsigned char new_fanout;

	/*
	 * When loading a branch, we don't traverse its tree to count the real
	 * number of notes (too expensive to do this for all non-note refs).
	 * This means that recently loaded notes refs might incorrectly have
	 * b->num_notes == 0, and consequently, old_fanout might be wrong.
	 *
	 * Fix this by traversing the tree and counting the number of notes
	 * when b->num_notes == 0. If the notes tree is truly empty, the
	 * calculation should not take long.
	 */
	if (b->num_notes == 0 && *old_fanout == 0) {
		/* Invoke change_note_fanout() in "counting mode". */
		b->num_notes = change_note_fanout(&b->branch_tree, 0xff);
		*old_fanout = convert_num_notes_to_fanout(b->num_notes);
	}

	/* Now parse the notemodify command. */
	/* <dataref> or 'inline' */
	if (*p == ':') {
		oe = find_mark(parse_mark_ref_space(&p));
		oidcpy(&oid, &oe->idx.oid);
	} else if (skip_prefix(p, "inline ", &p)) {
		inline_data = 1;
		oe = NULL; /* not used with inline_data, but makes gcc happy */
	} else {
		if (parse_oid_hex(p, &oid, &p))
			die("Invalid dataref: %s", command_buf.buf);
		oe = find_object(&oid);
		if (*p++ != ' ')
			die("Missing space after SHA1: %s", command_buf.buf);
	}

	/* <commit-ish> */
	s = lookup_branch(p);
	if (s) {
		if (is_null_oid(&s->oid))
			die("Can't add a note on empty branch.");
		oidcpy(&commit_oid, &s->oid);
	} else if (*p == ':') {
		uintmax_t commit_mark = parse_mark_ref_eol(p);
		struct object_entry *commit_oe = find_mark(commit_mark);
		if (commit_oe->type != OBJ_COMMIT)
			die("Mark :%" PRIuMAX " not a commit", commit_mark);
		oidcpy(&commit_oid, &commit_oe->idx.oid);
	} else if (!get_oid(p, &commit_oid)) {
		unsigned long size;
		char *buf = read_object_with_reference(&commit_oid,
						       commit_type, &size,
						       &commit_oid);
		if (!buf || size < 46)
			die("Not a valid commit: %s", p);
		free(buf);
	} else
		die("Invalid ref name or SHA1 expression: %s", p);

	if (inline_data) {
		if (p != uq.buf) {
			strbuf_addstr(&uq, p);
			p = uq.buf;
		}
		read_next_command();
		parse_and_store_blob(&last_blob, &oid, 0);
	} else if (oe) {
		if (oe->type != OBJ_BLOB)
			die("Not a blob (actually a %s): %s",
				type_name(oe->type), command_buf.buf);
	} else if (!is_null_oid(&oid)) {
		enum object_type type = oid_object_info(the_repository, &oid,
							NULL);
		if (type < 0)
			die("Blob not found: %s", command_buf.buf);
		if (type != OBJ_BLOB)
			die("Not a blob (actually a %s): %s",
			    type_name(type), command_buf.buf);
	}

	construct_path_with_fanout(oid_to_hex(&commit_oid), *old_fanout, path);
	if (tree_content_remove(&b->branch_tree, path, NULL, 0))
		b->num_notes--;

	if (is_null_oid(&oid))
		return; /* nothing to insert */

	b->num_notes++;
	new_fanout = convert_num_notes_to_fanout(b->num_notes);
	construct_path_with_fanout(oid_to_hex(&commit_oid), new_fanout, path);
	tree_content_set(&b->branch_tree, path, &oid, S_IFREG | 0644, NULL);
}

static void file_change_deleteall(struct branch *b)
{
	release_tree_content_recursive(b->branch_tree.tree);
	oidclr(&b->branch_tree.versions[0].oid);
	oidclr(&b->branch_tree.versions[1].oid);
	load_tree(&b->branch_tree);
	b->num_notes = 0;
}

static void parse_from_commit(struct branch *b, char *buf, unsigned long size)
{
	if (!buf || size < GIT_SHA1_HEXSZ + 6)
		die("Not a valid commit: %s", oid_to_hex(&b->oid));
	if (memcmp("tree ", buf, 5)
		|| get_oid_hex(buf + 5, &b->branch_tree.versions[1].oid))
		die("The commit %s is corrupt", oid_to_hex(&b->oid));
	oidcpy(&b->branch_tree.versions[0].oid,
	       &b->branch_tree.versions[1].oid);
}

static void parse_from_existing(struct branch *b)
{
	if (is_null_oid(&b->oid)) {
		oidclr(&b->branch_tree.versions[0].oid);
		oidclr(&b->branch_tree.versions[1].oid);
	} else {
		unsigned long size;
		char *buf;

		buf = read_object_with_reference(&b->oid, commit_type, &size,
						 &b->oid);
		parse_from_commit(b, buf, size);
		free(buf);
	}
}

static int parse_from(struct branch *b)
{
	const char *from;
	struct branch *s;
	struct object_id oid;

	if (!skip_prefix(command_buf.buf, "from ", &from))
		return 0;

	oidcpy(&oid, &b->branch_tree.versions[1].oid);

	s = lookup_branch(from);
	if (b == s)
		die("Can't create a branch from itself: %s", b->name);
	else if (s) {
		struct object_id *t = &s->branch_tree.versions[1].oid;
		oidcpy(&b->oid, &s->oid);
		oidcpy(&b->branch_tree.versions[0].oid, t);
		oidcpy(&b->branch_tree.versions[1].oid, t);
	} else if (*from == ':') {
		uintmax_t idnum = parse_mark_ref_eol(from);
		struct object_entry *oe = find_mark(idnum);
		if (oe->type != OBJ_COMMIT)
			die("Mark :%" PRIuMAX " not a commit", idnum);
		if (!oideq(&b->oid, &oe->idx.oid)) {
			oidcpy(&b->oid, &oe->idx.oid);
			if (oe->pack_id != MAX_PACK_ID) {
				unsigned long size;
				char *buf = gfi_unpack_entry(oe, &size);
				parse_from_commit(b, buf, size);
				free(buf);
			} else
				parse_from_existing(b);
		}
	} else if (!get_oid(from, &b->oid)) {
		parse_from_existing(b);
		if (is_null_oid(&b->oid))
			b->delete = 1;
	}
	else
		die("Invalid ref name or SHA1 expression: %s", from);

	if (b->branch_tree.tree && !oideq(&oid, &b->branch_tree.versions[1].oid)) {
		release_tree_content_recursive(b->branch_tree.tree);
		b->branch_tree.tree = NULL;
	}

	read_next_command();
	return 1;
}

static struct hash_list *parse_merge(unsigned int *count)
{
	struct hash_list *list = NULL, **tail = &list, *n;
	const char *from;
	struct branch *s;

	*count = 0;
	while (skip_prefix(command_buf.buf, "merge ", &from)) {
		n = xmalloc(sizeof(*n));
		s = lookup_branch(from);
		if (s)
			oidcpy(&n->oid, &s->oid);
		else if (*from == ':') {
			uintmax_t idnum = parse_mark_ref_eol(from);
			struct object_entry *oe = find_mark(idnum);
			if (oe->type != OBJ_COMMIT)
				die("Mark :%" PRIuMAX " not a commit", idnum);
			oidcpy(&n->oid, &oe->idx.oid);
		} else if (!get_oid(from, &n->oid)) {
			unsigned long size;
			char *buf = read_object_with_reference(&n->oid,
							       commit_type,
							       &size, &n->oid);
			if (!buf || size < 46)
				die("Not a valid commit: %s", from);
			free(buf);
		} else
			die("Invalid ref name or SHA1 expression: %s", from);

		n->next = NULL;
		*tail = n;
		tail = &n->next;

		(*count)++;
		read_next_command();
	}
	return list;
}

static void parse_new_commit(const char *arg)
{
	static struct strbuf msg = STRBUF_INIT;
	struct branch *b;
	char *author = NULL;
	char *committer = NULL;
	struct hash_list *merge_list = NULL;
	unsigned int merge_count;
	unsigned char prev_fanout, new_fanout;
	const char *v;

	b = lookup_branch(arg);
	if (!b)
		b = new_branch(arg);

	read_next_command();
	parse_mark();
	if (skip_prefix(command_buf.buf, "author ", &v)) {
		author = parse_ident(v);
		read_next_command();
	}
	if (skip_prefix(command_buf.buf, "committer ", &v)) {
		committer = parse_ident(v);
		read_next_command();
	}
	if (!committer)
		die("Expected committer but didn't get one");
	parse_data(&msg, 0, NULL);
	read_next_command();
	parse_from(b);
	merge_list = parse_merge(&merge_count);

	/* ensure the branch is active/loaded */
	if (!b->branch_tree.tree || !max_active_branches) {
		unload_one_branch();
		load_branch(b);
	}

	prev_fanout = convert_num_notes_to_fanout(b->num_notes);

	/* file_change* */
	while (command_buf.len > 0) {
		if (skip_prefix(command_buf.buf, "M ", &v))
			file_change_m(v, b);
		else if (skip_prefix(command_buf.buf, "D ", &v))
			file_change_d(v, b);
		else if (skip_prefix(command_buf.buf, "R ", &v))
			file_change_cr(v, b, 1);
		else if (skip_prefix(command_buf.buf, "C ", &v))
			file_change_cr(v, b, 0);
		else if (skip_prefix(command_buf.buf, "N ", &v))
			note_change_n(v, b, &prev_fanout);
		else if (!strcmp("deleteall", command_buf.buf))
			file_change_deleteall(b);
		else if (skip_prefix(command_buf.buf, "ls ", &v))
			parse_ls(v, b);
		else {
			unread_command_buf = 1;
			break;
		}
		if (read_next_command() == EOF)
			break;
	}

	new_fanout = convert_num_notes_to_fanout(b->num_notes);
	if (new_fanout != prev_fanout)
		b->num_notes = change_note_fanout(&b->branch_tree, new_fanout);

	/* build the tree and the commit */
	store_tree(&b->branch_tree);
	oidcpy(&b->branch_tree.versions[0].oid,
	       &b->branch_tree.versions[1].oid);

	strbuf_reset(&new_data);
	strbuf_addf(&new_data, "tree %s\n",
		oid_to_hex(&b->branch_tree.versions[1].oid));
	if (!is_null_oid(&b->oid))
		strbuf_addf(&new_data, "parent %s\n",
			    oid_to_hex(&b->oid));
	while (merge_list) {
		struct hash_list *next = merge_list->next;
		strbuf_addf(&new_data, "parent %s\n",
			    oid_to_hex(&merge_list->oid));
		free(merge_list);
		merge_list = next;
	}
	strbuf_addf(&new_data,
		"author %s\n"
		"committer %s\n"
		"\n",
		author ? author : committer, committer);
	strbuf_addbuf(&new_data, &msg);
	free(author);
	free(committer);

	if (!store_object(OBJ_COMMIT, &new_data, NULL, &b->oid, next_mark))
		b->pack_id = pack_id;
	b->last_commit = object_count_by_type[OBJ_COMMIT];
}

static void parse_new_tag(const char *arg)
{
	static struct strbuf msg = STRBUF_INIT;
	const char *from;
	char *tagger;
	struct branch *s;
	struct tag *t;
	uintmax_t from_mark = 0;
	struct object_id oid;
	enum object_type type;
	const char *v;

	t = mem_pool_alloc(&fi_mem_pool, sizeof(struct tag));
	memset(t, 0, sizeof(struct tag));
	t->name = pool_strdup(arg);
	if (last_tag)
		last_tag->next_tag = t;
	else
		first_tag = t;
	last_tag = t;
	read_next_command();

	/* from ... */
	if (!skip_prefix(command_buf.buf, "from ", &from))
		die("Expected from command, got %s", command_buf.buf);
	s = lookup_branch(from);
	if (s) {
		if (is_null_oid(&s->oid))
			die("Can't tag an empty branch.");
		oidcpy(&oid, &s->oid);
		type = OBJ_COMMIT;
	} else if (*from == ':') {
		struct object_entry *oe;
		from_mark = parse_mark_ref_eol(from);
		oe = find_mark(from_mark);
		type = oe->type;
		oidcpy(&oid, &oe->idx.oid);
	} else if (!get_oid(from, &oid)) {
		struct object_entry *oe = find_object(&oid);
		if (!oe) {
			type = oid_object_info(the_repository, &oid, NULL);
			if (type < 0)
				die("Not a valid object: %s", from);
		} else
			type = oe->type;
	} else
		die("Invalid ref name or SHA1 expression: %s", from);
	read_next_command();

	/* tagger ... */
	if (skip_prefix(command_buf.buf, "tagger ", &v)) {
		tagger = parse_ident(v);
		read_next_command();
	} else
		tagger = NULL;

	/* tag payload/message */
	parse_data(&msg, 0, NULL);

	/* build the tag object */
	strbuf_reset(&new_data);

	strbuf_addf(&new_data,
		    "object %s\n"
		    "type %s\n"
		    "tag %s\n",
		    oid_to_hex(&oid), type_name(type), t->name);
	if (tagger)
		strbuf_addf(&new_data,
			    "tagger %s\n", tagger);
	strbuf_addch(&new_data, '\n');
	strbuf_addbuf(&new_data, &msg);
	free(tagger);

	if (store_object(OBJ_TAG, &new_data, NULL, &t->oid, 0))
		t->pack_id = MAX_PACK_ID;
	else
		t->pack_id = pack_id;
}

static void parse_reset_branch(const char *arg)
{
	struct branch *b;

	b = lookup_branch(arg);
	if (b) {
		oidclr(&b->oid);
		oidclr(&b->branch_tree.versions[0].oid);
		oidclr(&b->branch_tree.versions[1].oid);
		if (b->branch_tree.tree) {
			release_tree_content_recursive(b->branch_tree.tree);
			b->branch_tree.tree = NULL;
		}
	}
	else
		b = new_branch(arg);
	read_next_command();
	parse_from(b);
	if (command_buf.len > 0)
		unread_command_buf = 1;
}

static void cat_blob_write(const char *buf, unsigned long size)
{
	if (write_in_full(cat_blob_fd, buf, size) < 0)
		die_errno("Write to frontend failed");
}

static void cat_blob(struct object_entry *oe, struct object_id *oid)
{
	struct strbuf line = STRBUF_INIT;
	unsigned long size;
	enum object_type type = 0;
	char *buf;

	if (!oe || oe->pack_id == MAX_PACK_ID) {
		buf = read_object_file(oid, &type, &size);
	} else {
		type = oe->type;
		buf = gfi_unpack_entry(oe, &size);
	}

	/*
	 * Output based on batch_one_object() from cat-file.c.
	 */
	if (type <= 0) {
		strbuf_reset(&line);
		strbuf_addf(&line, "%s missing\n", oid_to_hex(oid));
		cat_blob_write(line.buf, line.len);
		strbuf_release(&line);
		free(buf);
		return;
	}
	if (!buf)
		die("Can't read object %s", oid_to_hex(oid));
	if (type != OBJ_BLOB)
		die("Object %s is a %s but a blob was expected.",
		    oid_to_hex(oid), type_name(type));
	strbuf_reset(&line);
	strbuf_addf(&line, "%s %s %"PRIuMAX"\n", oid_to_hex(oid),
		    type_name(type), (uintmax_t)size);
	cat_blob_write(line.buf, line.len);
	strbuf_release(&line);
	cat_blob_write(buf, size);
	cat_blob_write("\n", 1);
	if (oe && oe->pack_id == pack_id) {
		last_blob.offset = oe->idx.offset;
		strbuf_attach(&last_blob.data, buf, size, size);
		last_blob.depth = oe->depth;
	} else
		free(buf);
}

static void parse_get_mark(const char *p)
{
	struct object_entry *oe;
	char output[GIT_MAX_HEXSZ + 2];

	/* get-mark SP <object> LF */
	if (*p != ':')
		die("Not a mark: %s", p);

	oe = find_mark(parse_mark_ref_eol(p));
	if (!oe)
		die("Unknown mark: %s", command_buf.buf);

	xsnprintf(output, sizeof(output), "%s\n", oid_to_hex(&oe->idx.oid));
	cat_blob_write(output, GIT_SHA1_HEXSZ + 1);
}

static void parse_cat_blob(const char *p)
{
	struct object_entry *oe;
	struct object_id oid;

	/* cat-blob SP <object> LF */
	if (*p == ':') {
		oe = find_mark(parse_mark_ref_eol(p));
		if (!oe)
			die("Unknown mark: %s", command_buf.buf);
		oidcpy(&oid, &oe->idx.oid);
	} else {
		if (parse_oid_hex(p, &oid, &p))
			die("Invalid dataref: %s", command_buf.buf);
		if (*p)
			die("Garbage after SHA1: %s", command_buf.buf);
		oe = find_object(&oid);
	}

	cat_blob(oe, &oid);
}

static struct object_entry *dereference(struct object_entry *oe,
					struct object_id *oid)
{
	unsigned long size;
	char *buf = NULL;
	if (!oe) {
		enum object_type type = oid_object_info(the_repository, oid,
							NULL);
		if (type < 0)
			die("object not found: %s", oid_to_hex(oid));
		/* cache it! */
		oe = insert_object(oid);
		oe->type = type;
		oe->pack_id = MAX_PACK_ID;
		oe->idx.offset = 1;
	}
	switch (oe->type) {
	case OBJ_TREE:	/* easy case. */
		return oe;
	case OBJ_COMMIT:
	case OBJ_TAG:
		break;
	default:
		die("Not a tree-ish: %s", command_buf.buf);
	}

	if (oe->pack_id != MAX_PACK_ID) {	/* in a pack being written */
		buf = gfi_unpack_entry(oe, &size);
	} else {
		enum object_type unused;
		buf = read_object_file(oid, &unused, &size);
	}
	if (!buf)
		die("Can't load object %s", oid_to_hex(oid));

	/* Peel one layer. */
	switch (oe->type) {
	case OBJ_TAG:
		if (size < GIT_SHA1_HEXSZ + strlen("object ") ||
		    get_oid_hex(buf + strlen("object "), oid))
			die("Invalid SHA1 in tag: %s", command_buf.buf);
		break;
	case OBJ_COMMIT:
		if (size < GIT_SHA1_HEXSZ + strlen("tree ") ||
		    get_oid_hex(buf + strlen("tree "), oid))
			die("Invalid SHA1 in commit: %s", command_buf.buf);
	}

	free(buf);
	return find_object(oid);
}

static struct object_entry *parse_treeish_dataref(const char **p)
{
	struct object_id oid;
	struct object_entry *e;

	if (**p == ':') {	/* <mark> */
		e = find_mark(parse_mark_ref_space(p));
		if (!e)
			die("Unknown mark: %s", command_buf.buf);
		oidcpy(&oid, &e->idx.oid);
	} else {	/* <sha1> */
		if (parse_oid_hex(*p, &oid, p))
			die("Invalid dataref: %s", command_buf.buf);
		e = find_object(&oid);
		if (*(*p)++ != ' ')
			die("Missing space after tree-ish: %s", command_buf.buf);
	}

	while (!e || e->type != OBJ_TREE)
		e = dereference(e, &oid);
	return e;
}

static void print_ls(int mode, const unsigned char *sha1, const char *path)
{
	static struct strbuf line = STRBUF_INIT;

	/* See show_tree(). */
	const char *type =
		S_ISGITLINK(mode) ? commit_type :
		S_ISDIR(mode) ? tree_type :
		blob_type;

	if (!mode) {
		/* missing SP path LF */
		strbuf_reset(&line);
		strbuf_addstr(&line, "missing ");
		quote_c_style(path, &line, NULL, 0);
		strbuf_addch(&line, '\n');
	} else {
		/* mode SP type SP object_name TAB path LF */
		strbuf_reset(&line);
		strbuf_addf(&line, "%06o %s %s\t",
				mode & ~NO_DELTA, type, sha1_to_hex(sha1));
		quote_c_style(path, &line, NULL, 0);
		strbuf_addch(&line, '\n');
	}
	cat_blob_write(line.buf, line.len);
}

static void parse_ls(const char *p, struct branch *b)
{
	struct tree_entry *root = NULL;
	struct tree_entry leaf = {NULL};

	/* ls SP (<tree-ish> SP)? <path> */
	if (*p == '"') {
		if (!b)
			die("Not in a commit: %s", command_buf.buf);
		root = &b->branch_tree;
	} else {
		struct object_entry *e = parse_treeish_dataref(&p);
		root = new_tree_entry();
		oidcpy(&root->versions[1].oid, &e->idx.oid);
		if (!is_null_oid(&root->versions[1].oid))
			root->versions[1].mode = S_IFDIR;
		load_tree(root);
	}
	if (*p == '"') {
		static struct strbuf uq = STRBUF_INIT;
		const char *endp;
		strbuf_reset(&uq);
		if (unquote_c_style(&uq, p, &endp))
			die("Invalid path: %s", command_buf.buf);
		if (*endp)
			die("Garbage after path in: %s", command_buf.buf);
		p = uq.buf;
	}
	tree_content_get(root, p, &leaf, 1);
	/*
	 * A directory in preparation would have a sha1 of zero
	 * until it is saved.  Save, for simplicity.
	 */
	if (S_ISDIR(leaf.versions[1].mode))
		store_tree(&leaf);

	print_ls(leaf.versions[1].mode, leaf.versions[1].oid.hash, p);
	if (leaf.tree)
		release_tree_content_recursive(leaf.tree);
	if (!b || root != &b->branch_tree)
		release_tree_entry(root);
}

static void checkpoint(void)
{
	checkpoint_requested = 0;
	if (object_count) {
		cycle_packfile();
	}
	dump_branches();
	dump_tags();
	dump_marks();
}

static void parse_checkpoint(void)
{
	checkpoint_requested = 1;
	skip_optional_lf();
}

static void parse_progress(void)
{
	fwrite(command_buf.buf, 1, command_buf.len, stdout);
	fputc('\n', stdout);
	fflush(stdout);
	skip_optional_lf();
}

static char* make_fast_import_path(const char *path)
{
	if (!relative_marks_paths || is_absolute_path(path))
		return xstrdup(path);
	return git_pathdup("info/fast-import/%s", path);
}

static void option_import_marks(const char *marks,
					int from_stream, int ignore_missing)
{
	if (import_marks_file) {
		if (from_stream)
			die("Only one import-marks command allowed per stream");

		/* read previous mark file */
		if(!import_marks_file_from_stream)
			read_marks();
	}

	import_marks_file = make_fast_import_path(marks);
	import_marks_file_from_stream = from_stream;
	import_marks_file_ignore_missing = ignore_missing;
}

static void option_date_format(const char *fmt)
{
	if (!strcmp(fmt, "raw"))
		whenspec = WHENSPEC_RAW;
	else if (!strcmp(fmt, "rfc2822"))
		whenspec = WHENSPEC_RFC2822;
	else if (!strcmp(fmt, "now"))
		whenspec = WHENSPEC_NOW;
	else
		die("unknown --date-format argument %s", fmt);
}

static unsigned long ulong_arg(const char *option, const char *arg)
{
	char *endptr;
	unsigned long rv = strtoul(arg, &endptr, 0);
	if (strchr(arg, '-') || endptr == arg || *endptr)
		die("%s: argument must be a non-negative integer", option);
	return rv;
}

static void option_depth(const char *depth)
{
	max_depth = ulong_arg("--depth", depth);
	if (max_depth > MAX_DEPTH)
		die("--depth cannot exceed %u", MAX_DEPTH);
}

static void option_active_branches(const char *branches)
{
	max_active_branches = ulong_arg("--active-branches", branches);
}

static void option_export_marks(const char *marks)
{
	export_marks_file = make_fast_import_path(marks);
}

static void option_cat_blob_fd(const char *fd)
{
	unsigned long n = ulong_arg("--cat-blob-fd", fd);
	if (n > (unsigned long) INT_MAX)
		die("--cat-blob-fd cannot exceed %d", INT_MAX);
	cat_blob_fd = (int) n;
}

static void option_export_pack_edges(const char *edges)
{
	if (pack_edges)
		fclose(pack_edges);
	pack_edges = xfopen(edges, "a");
}

static int parse_one_option(const char *option)
{
	if (skip_prefix(option, "max-pack-size=", &option)) {
		unsigned long v;
		if (!git_parse_ulong(option, &v))
			return 0;
		if (v < 8192) {
			warning("max-pack-size is now in bytes, assuming --max-pack-size=%lum", v);
			v *= 1024 * 1024;
		} else if (v < 1024 * 1024) {
			warning("minimum max-pack-size is 1 MiB");
			v = 1024 * 1024;
		}
		max_packsize = v;
	} else if (skip_prefix(option, "big-file-threshold=", &option)) {
		unsigned long v;
		if (!git_parse_ulong(option, &v))
			return 0;
		big_file_threshold = v;
	} else if (skip_prefix(option, "depth=", &option)) {
		option_depth(option);
	} else if (skip_prefix(option, "active-branches=", &option)) {
		option_active_branches(option);
	} else if (skip_prefix(option, "export-pack-edges=", &option)) {
		option_export_pack_edges(option);
	} else if (!strcmp(option, "quiet")) {
		show_stats = 0;
	} else if (!strcmp(option, "stats")) {
		show_stats = 1;
	} else if (!strcmp(option, "allow-unsafe-features")) {
		; /* already handled during early option parsing */
	} else {
		return 0;
	}

	return 1;
}

static void check_unsafe_feature(const char *feature, int from_stream)
{
	if (from_stream && !allow_unsafe_features)
		die(_("feature '%s' forbidden in input without --allow-unsafe-features"),
		    feature);
}

static int parse_one_feature(const char *feature, int from_stream)
{
	const char *arg;

	if (skip_prefix(feature, "date-format=", &arg)) {
		option_date_format(arg);
	} else if (skip_prefix(feature, "import-marks=", &arg)) {
		check_unsafe_feature("import-marks", from_stream);
		option_import_marks(arg, from_stream, 0);
	} else if (skip_prefix(feature, "import-marks-if-exists=", &arg)) {
		check_unsafe_feature("import-marks-if-exists", from_stream);
		option_import_marks(arg, from_stream, 1);
	} else if (skip_prefix(feature, "export-marks=", &arg)) {
		check_unsafe_feature(feature, from_stream);
		option_export_marks(arg);
	} else if (!strcmp(feature, "get-mark")) {
		; /* Don't die - this feature is supported */
	} else if (!strcmp(feature, "cat-blob")) {
		; /* Don't die - this feature is supported */
	} else if (!strcmp(feature, "relative-marks")) {
		relative_marks_paths = 1;
	} else if (!strcmp(feature, "no-relative-marks")) {
		relative_marks_paths = 0;
	} else if (!strcmp(feature, "done")) {
		require_explicit_termination = 1;
	} else if (!strcmp(feature, "force")) {
		force_update = 1;
	} else if (!strcmp(feature, "notes") || !strcmp(feature, "ls")) {
		; /* do nothing; we have the feature */
	} else {
		return 0;
	}

	return 1;
}

static void parse_feature(const char *feature)
{
	if (seen_data_command)
		die("Got feature command '%s' after data command", feature);

	if (parse_one_feature(feature, 1))
		return;

	die("This version of fast-import does not support feature %s.", feature);
}

static void parse_option(const char *option)
{
	if (seen_data_command)
		die("Got option command '%s' after data command", option);

	if (parse_one_option(option))
		return;

	die("This version of fast-import does not support option: %s", option);
}

static void git_pack_config(void)
{
	int indexversion_value;
	int limit;
	unsigned long packsizelimit_value;

	if (!git_config_get_ulong("pack.depth", &max_depth)) {
		if (max_depth > MAX_DEPTH)
			max_depth = MAX_DEPTH;
	}
	if (!git_config_get_int("pack.indexversion", &indexversion_value)) {
		pack_idx_opts.version = indexversion_value;
		if (pack_idx_opts.version > 2)
			git_die_config("pack.indexversion",
					"bad pack.indexversion=%"PRIu32, pack_idx_opts.version);
	}
	if (!git_config_get_ulong("pack.packsizelimit", &packsizelimit_value))
		max_packsize = packsizelimit_value;

	if (!git_config_get_int("fastimport.unpacklimit", &limit))
		unpack_limit = limit;
	else if (!git_config_get_int("transfer.unpacklimit", &limit))
		unpack_limit = limit;

	git_config(git_default_config, NULL);
}

static const char fast_import_usage[] =
"git fast-import [--date-format=<f>] [--max-pack-size=<n>] [--big-file-threshold=<n>] [--depth=<n>] [--active-branches=<n>] [--export-marks=<marks.file>]";

static void parse_argv(void)
{
	unsigned int i;

	for (i = 1; i < global_argc; i++) {
		const char *a = global_argv[i];

		if (*a != '-' || !strcmp(a, "--"))
			break;

		if (!skip_prefix(a, "--", &a))
			die("unknown option %s", a);

		if (parse_one_option(a))
			continue;

		if (parse_one_feature(a, 0))
			continue;

		if (skip_prefix(a, "cat-blob-fd=", &a)) {
			option_cat_blob_fd(a);
			continue;
		}

		die("unknown option --%s", a);
	}
	if (i != global_argc)
		usage(fast_import_usage);

	seen_data_command = 1;
	if (import_marks_file)
		read_marks();
}

int cmd_main(int argc, const char **argv)
{
	unsigned int i;

	if (argc == 2 && !strcmp(argv[1], "-h"))
		usage(fast_import_usage);

	setup_git_directory();
	reset_pack_idx_option(&pack_idx_opts);
	git_pack_config();

	alloc_objects(object_entry_alloc);
	strbuf_init(&command_buf, 0);
	atom_table = xcalloc(atom_table_sz, sizeof(struct atom_str*));
	branch_table = xcalloc(branch_table_sz, sizeof(struct branch*));
	avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
	marks = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct mark_set));

	/*
	 * We don't parse most options until after we've seen the set of
	 * "feature" lines at the start of the stream (which allows the command
	 * line to override stream data). But we must do an early parse of any
	 * command-line options that impact how we interpret the feature lines.
	 */
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (*arg != '-' || !strcmp(arg, "--"))
			break;
		if (!strcmp(arg, "--allow-unsafe-features"))
			allow_unsafe_features = 1;
	}

	global_argc = argc;
	global_argv = argv;

	rc_free = mem_pool_alloc(&fi_mem_pool, cmd_save * sizeof(*rc_free));
	for (i = 0; i < (cmd_save - 1); i++)
		rc_free[i].next = &rc_free[i + 1];
	rc_free[cmd_save - 1].next = NULL;

	start_packfile();
	set_die_routine(die_nicely);
	set_checkpoint_signal();
	while (read_next_command() != EOF) {
		const char *v;
		if (!strcmp("blob", command_buf.buf))
			parse_new_blob();
		else if (skip_prefix(command_buf.buf, "ls ", &v))
			parse_ls(v, NULL);
		else if (skip_prefix(command_buf.buf, "commit ", &v))
			parse_new_commit(v);
		else if (skip_prefix(command_buf.buf, "tag ", &v))
			parse_new_tag(v);
		else if (skip_prefix(command_buf.buf, "reset ", &v))
			parse_reset_branch(v);
		else if (!strcmp("checkpoint", command_buf.buf))
			parse_checkpoint();
		else if (!strcmp("done", command_buf.buf))
			break;
		else if (starts_with(command_buf.buf, "progress "))
			parse_progress();
		else if (skip_prefix(command_buf.buf, "feature ", &v))
			parse_feature(v);
		else if (skip_prefix(command_buf.buf, "option git ", &v))
			parse_option(v);
		else if (starts_with(command_buf.buf, "option "))
			/* ignore non-git options*/;
		else
			die("Unsupported command: %s", command_buf.buf);

		if (checkpoint_requested)
			checkpoint();
	}

	/* argv hasn't been parsed yet, do so */
	if (!seen_data_command)
		parse_argv();

	if (require_explicit_termination && feof(stdin))
		die("stream ends early");

	end_packfile();

	dump_branches();
	dump_tags();
	unkeep_all_packs();
	dump_marks();

	if (pack_edges)
		fclose(pack_edges);

	if (show_stats) {
		uintmax_t total_count = 0, duplicate_count = 0;
		for (i = 0; i < ARRAY_SIZE(object_count_by_type); i++)
			total_count += object_count_by_type[i];
		for (i = 0; i < ARRAY_SIZE(duplicate_count_by_type); i++)
			duplicate_count += duplicate_count_by_type[i];

		fprintf(stderr, "%s statistics:\n", argv[0]);
		fprintf(stderr, "---------------------------------------------------------------------\n");
		fprintf(stderr, "Alloc'd objects: %10" PRIuMAX "\n", alloc_count);
		fprintf(stderr, "Total objects:   %10" PRIuMAX " (%10" PRIuMAX " duplicates                  )\n", total_count, duplicate_count);
		fprintf(stderr, "      blobs  :   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_BLOB], duplicate_count_by_type[OBJ_BLOB], delta_count_by_type[OBJ_BLOB], delta_count_attempts_by_type[OBJ_BLOB]);
		fprintf(stderr, "      trees  :   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_TREE], duplicate_count_by_type[OBJ_TREE], delta_count_by_type[OBJ_TREE], delta_count_attempts_by_type[OBJ_TREE]);
		fprintf(stderr, "      commits:   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_COMMIT], duplicate_count_by_type[OBJ_COMMIT], delta_count_by_type[OBJ_COMMIT], delta_count_attempts_by_type[OBJ_COMMIT]);
		fprintf(stderr, "      tags   :   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_TAG], duplicate_count_by_type[OBJ_TAG], delta_count_by_type[OBJ_TAG], delta_count_attempts_by_type[OBJ_TAG]);
		fprintf(stderr, "Total branches:  %10lu (%10lu loads     )\n", branch_count, branch_load_count);
		fprintf(stderr, "      marks:     %10" PRIuMAX " (%10" PRIuMAX " unique    )\n", (((uintmax_t)1) << marks->shift) * 1024, marks_set_count);
		fprintf(stderr, "      atoms:     %10u\n", atom_cnt);
		fprintf(stderr, "Memory total:    %10" PRIuMAX " KiB\n", (tree_entry_allocd + fi_mem_pool.pool_alloc + alloc_count*sizeof(struct object_entry))/1024);
		fprintf(stderr, "       pools:    %10lu KiB\n", (unsigned long)((tree_entry_allocd + fi_mem_pool.pool_alloc) /1024));
		fprintf(stderr, "     objects:    %10" PRIuMAX " KiB\n", (alloc_count*sizeof(struct object_entry))/1024);
		fprintf(stderr, "---------------------------------------------------------------------\n");
		pack_report();
		fprintf(stderr, "---------------------------------------------------------------------\n");
		fprintf(stderr, "\n");
	}

	return failure ? 1 : 0;
}