summaryrefslogtreecommitdiff
path: root/builtin-fetch.c
blob: de9947e7ac2cc1236909fab813198b3df93bd39e (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
/*
 * "git fetch"
 */
#include "cache.h"
#include "refs.h"
#include "commit.h"
#include "builtin.h"
#include "path-list.h"
#include "remote.h"
#include "transport.h"
#include "run-command.h"

static const char fetch_usage[] = "git-fetch [-a | --append] [--upload-pack <upload-pack>] [-f | --force] [--no-tags] [-t | --tags] [-k | --keep] [-u | --update-head-ok] [--depth <depth>] [-v | --verbose] [<repository> <refspec>...]";

static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
static const char *depth;
static char *default_rla = NULL;
static struct transport *transport;

static void unlock_pack(void)
{
	if (transport)
		transport_unlock_pack(transport);
}

static void unlock_pack_on_signal(int signo)
{
	unlock_pack();
	signal(SIGINT, SIG_DFL);
	raise(signo);
}

static void add_merge_config(struct ref **head,
			   const struct ref *remote_refs,
		           struct branch *branch,
		           struct ref ***tail)
{
	int i;

	for (i = 0; i < branch->merge_nr; i++) {
		struct ref *rm, **old_tail = *tail;
		struct refspec refspec;

		for (rm = *head; rm; rm = rm->next) {
			if (branch_merge_matches(branch, i, rm->name)) {
				rm->merge = 1;
				break;
			}
		}
		if (rm)
			continue;

		/*
		 * Not fetched to a tracking branch?  We need to fetch
		 * it anyway to allow this branch's "branch.$name.merge"
		 * to be honored by git-pull, but we do not have to
		 * fail if branch.$name.merge is misconfigured to point
		 * at a nonexisting branch.  If we were indeed called by
		 * git-pull, it will notice the misconfiguration because
		 * there is no entry in the resulting FETCH_HEAD marked
		 * for merging.
		 */
		refspec.src = branch->merge[i]->src;
		refspec.dst = NULL;
		refspec.pattern = 0;
		refspec.force = 0;
		get_fetch_map(remote_refs, &refspec, tail, 1);
		for (rm = *old_tail; rm; rm = rm->next)
			rm->merge = 1;
	}
}

static struct ref *get_ref_map(struct transport *transport,
			       struct refspec *refs, int ref_count, int tags,
			       int *autotags)
{
	int i;
	struct ref *rm;
	struct ref *ref_map = NULL;
	struct ref **tail = &ref_map;

	const struct ref *remote_refs = transport_get_remote_refs(transport);

	if (ref_count || tags) {
		for (i = 0; i < ref_count; i++) {
			get_fetch_map(remote_refs, &refs[i], &tail, 0);
			if (refs[i].dst && refs[i].dst[0])
				*autotags = 1;
		}
		/* Merge everything on the command line, but not --tags */
		for (rm = ref_map; rm; rm = rm->next)
			rm->merge = 1;
		if (tags) {
			struct refspec refspec;
			refspec.src = "refs/tags/";
			refspec.dst = "refs/tags/";
			refspec.pattern = 1;
			refspec.force = 0;
			get_fetch_map(remote_refs, &refspec, &tail, 0);
		}
	} else {
		/* Use the defaults */
		struct remote *remote = transport->remote;
		struct branch *branch = branch_get(NULL);
		int has_merge = branch_has_merge_config(branch);
		if (remote && (remote->fetch_refspec_nr || has_merge)) {
			for (i = 0; i < remote->fetch_refspec_nr; i++) {
				get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
				if (remote->fetch[i].dst &&
				    remote->fetch[i].dst[0])
					*autotags = 1;
				if (!i && !has_merge && ref_map &&
				    !remote->fetch[0].pattern)
					ref_map->merge = 1;
			}
			/*
			 * if the remote we're fetching from is the same
			 * as given in branch.<name>.remote, we add the
			 * ref given in branch.<name>.merge, too.
			 */
			if (has_merge &&
			    !strcmp(branch->remote_name, remote->name))
				add_merge_config(&ref_map, remote_refs, branch, &tail);
		} else {
			ref_map = get_remote_ref(remote_refs, "HEAD");
			if (!ref_map)
				die("Couldn't find remote ref HEAD");
			ref_map->merge = 1;
		}
	}
	ref_remove_duplicates(ref_map);

	return ref_map;
}

static int s_update_ref(const char *action,
			struct ref *ref,
			int check_old)
{
	char msg[1024];
	char *rla = getenv("GIT_REFLOG_ACTION");
	static struct ref_lock *lock;

	if (!rla)
		rla = default_rla;
	snprintf(msg, sizeof(msg), "%s: %s", rla, action);
	lock = lock_any_ref_for_update(ref->name,
				       check_old ? ref->old_sha1 : NULL, 0);
	if (!lock)
		return 1;
	if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
		return 1;
	return 0;
}

#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
#define REFCOL_WIDTH  10

static int update_local_ref(struct ref *ref,
			    const char *remote,
			    int verbose,
			    char *display)
{
	struct commit *current = NULL, *updated;
	enum object_type type;
	struct branch *current_branch = branch_get(NULL);
	const char *pretty_ref = ref->name + (
		!prefixcmp(ref->name, "refs/heads/") ? 11 :
		!prefixcmp(ref->name, "refs/tags/") ? 10 :
		!prefixcmp(ref->name, "refs/remotes/") ? 13 :
		0);

	*display = 0;
	type = sha1_object_info(ref->new_sha1, NULL);
	if (type < 0)
		die("object %s not found", sha1_to_hex(ref->new_sha1));

	if (!*ref->name) {
		/* Not storing */
		if (verbose)
			sprintf(display, "* branch %s -> FETCH_HEAD", remote);
		return 0;
	}

	if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
		if (verbose)
			sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
				"[up to date]", REFCOL_WIDTH, remote,
				pretty_ref);
		return 0;
	}

	if (current_branch &&
	    !strcmp(ref->name, current_branch->name) &&
	    !(update_head_ok || is_bare_repository()) &&
	    !is_null_sha1(ref->old_sha1)) {
		/*
		 * If this is the head, and it's not okay to update
		 * the head, and the old value of the head isn't empty...
		 */
		sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
			SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
			pretty_ref);
		return 1;
	}

	if (!is_null_sha1(ref->old_sha1) &&
	    !prefixcmp(ref->name, "refs/tags/")) {
		sprintf(display, "- %-*s %-*s -> %s",
			SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
			pretty_ref);
		return s_update_ref("updating tag", ref, 0);
	}

	current = lookup_commit_reference_gently(ref->old_sha1, 1);
	updated = lookup_commit_reference_gently(ref->new_sha1, 1);
	if (!current || !updated) {
		const char *msg;
		const char *what;
		if (!strncmp(ref->name, "refs/tags/", 10)) {
			msg = "storing tag";
			what = "[new tag]";
		}
		else {
			msg = "storing head";
			what = "[new branch]";
		}

		sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
			REFCOL_WIDTH, remote, pretty_ref);
		return s_update_ref(msg, ref, 0);
	}

	if (in_merge_bases(current, &updated, 1)) {
		char quickref[83];
		strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
		strcat(quickref, "..");
		strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
		sprintf(display, "  %-*s %-*s -> %s", SUMMARY_WIDTH, quickref,
			REFCOL_WIDTH, remote, pretty_ref);
		return s_update_ref("fast forward", ref, 1);
	} else if (force || ref->force) {
		char quickref[84];
		strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
		strcat(quickref, "...");
		strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
		sprintf(display, "+ %-*s %-*s -> %s  (forced update)",
			SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote, pretty_ref);
		return s_update_ref("forced-update", ref, 1);
	} else {
		sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
			SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
			pretty_ref);
		return 1;
	}
}

static int store_updated_refs(const char *url, struct ref *ref_map)
{
	FILE *fp;
	struct commit *commit;
	int url_len, i, note_len, shown_url = 0;
	char note[1024];
	const char *what, *kind;
	struct ref *rm;
	char *filename = git_path("FETCH_HEAD");

	fp = fopen(filename, "a");
	if (!fp)
		return error("cannot open %s: %s\n", filename, strerror(errno));
	for (rm = ref_map; rm; rm = rm->next) {
		struct ref *ref = NULL;

		if (rm->peer_ref) {
			ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
			strcpy(ref->name, rm->peer_ref->name);
			hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
			hashcpy(ref->new_sha1, rm->old_sha1);
			ref->force = rm->peer_ref->force;
		}

		commit = lookup_commit_reference_gently(rm->old_sha1, 1);
		if (!commit)
			rm->merge = 0;

		if (!strcmp(rm->name, "HEAD")) {
			kind = "";
			what = "";
		}
		else if (!prefixcmp(rm->name, "refs/heads/")) {
			kind = "branch";
			what = rm->name + 11;
		}
		else if (!prefixcmp(rm->name, "refs/tags/")) {
			kind = "tag";
			what = rm->name + 10;
		}
		else if (!prefixcmp(rm->name, "refs/remotes/")) {
			kind = "remote branch";
			what = rm->name + 13;
		}
		else {
			kind = "";
			what = rm->name;
		}

		url_len = strlen(url);
		for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
			;
		url_len = i + 1;
		if (4 < i && !strncmp(".git", url + i - 3, 4))
			url_len = i - 3;

		note_len = 0;
		if (*what) {
			if (*kind)
				note_len += sprintf(note + note_len, "%s ",
						    kind);
			note_len += sprintf(note + note_len, "'%s' of ", what);
		}
		note_len += sprintf(note + note_len, "%.*s", url_len, url);
		fprintf(fp, "%s\t%s\t%s\n",
			sha1_to_hex(commit ? commit->object.sha1 :
				    rm->old_sha1),
			rm->merge ? "" : "not-for-merge",
			note);

		if (ref) {
			update_local_ref(ref, what, verbose, note);
			if (*note) {
				if (!shown_url) {
					fprintf(stderr, "From %.*s\n",
							url_len, url);
					shown_url = 1;
				}
				fprintf(stderr, " %s\n", note);
			}
		}
	}
	fclose(fp);
	return 0;
}

/*
 * We would want to bypass the object transfer altogether if
 * everything we are going to fetch already exists and connected
 * locally.
 *
 * The refs we are going to fetch are in to_fetch (nr_heads in
 * total).  If running
 *
 *  $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
 *
 * does not error out, that means everything reachable from the
 * refs we are going to fetch exists and is connected to some of
 * our existing refs.
 */
static int quickfetch(struct ref *ref_map)
{
	struct child_process revlist;
	struct ref *ref;
	char **argv;
	int i, err;

	/*
	 * If we are deepening a shallow clone we already have these
	 * objects reachable.  Running rev-list here will return with
	 * a good (0) exit status and we'll bypass the fetch that we
	 * really need to perform.  Claiming failure now will ensure
	 * we perform the network exchange to deepen our history.
	 */
	if (depth)
		return -1;

	for (i = 0, ref = ref_map; ref; ref = ref->next)
		i++;
	if (!i)
		return 0;

	argv = xmalloc(sizeof(*argv) * (i + 6));
	i = 0;
	argv[i++] = xstrdup("rev-list");
	argv[i++] = xstrdup("--quiet");
	argv[i++] = xstrdup("--objects");
	for (ref = ref_map; ref; ref = ref->next)
		argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
	argv[i++] = xstrdup("--not");
	argv[i++] = xstrdup("--all");
	argv[i++] = NULL;

	memset(&revlist, 0, sizeof(revlist));
	revlist.argv = (const char**)argv;
	revlist.git_cmd = 1;
	revlist.no_stdin = 1;
	revlist.no_stdout = 1;
	revlist.no_stderr = 1;
	err = run_command(&revlist);

	for (i = 0; argv[i]; i++)
		free(argv[i]);
	free(argv);
	return err;
}

static int fetch_refs(struct transport *transport, struct ref *ref_map)
{
	int ret = quickfetch(ref_map);
	if (ret)
		ret = transport_fetch_refs(transport, ref_map);
	if (!ret)
		ret |= store_updated_refs(transport->url, ref_map);
	transport_unlock_pack(transport);
	return ret;
}

static int add_existing(const char *refname, const unsigned char *sha1,
			int flag, void *cbdata)
{
	struct path_list *list = (struct path_list *)cbdata;
	path_list_insert(refname, list);
	return 0;
}

static struct ref *find_non_local_tags(struct transport *transport,
				       struct ref *fetch_map)
{
	static struct path_list existing_refs = { NULL, 0, 0, 0 };
	struct path_list new_refs = { NULL, 0, 0, 1 };
	char *ref_name;
	int ref_name_len;
	const unsigned char *ref_sha1;
	const struct ref *tag_ref;
	struct ref *rm = NULL;
	struct ref *ref_map = NULL;
	struct ref **tail = &ref_map;
	const struct ref *ref;

	for_each_ref(add_existing, &existing_refs);
	for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
		if (prefixcmp(ref->name, "refs/tags"))
			continue;

		ref_name = xstrdup(ref->name);
		ref_name_len = strlen(ref_name);
		ref_sha1 = ref->old_sha1;

		if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
			ref_name[ref_name_len - 3] = 0;
			tag_ref = transport_get_remote_refs(transport);
			while (tag_ref) {
				if (!strcmp(tag_ref->name, ref_name)) {
					ref_sha1 = tag_ref->old_sha1;
					break;
				}
				tag_ref = tag_ref->next;
			}
		}

		if (!path_list_has_path(&existing_refs, ref_name) &&
		    !path_list_has_path(&new_refs, ref_name) &&
		    has_sha1_file(ref->old_sha1)) {
			path_list_insert(ref_name, &new_refs);

			rm = alloc_ref(strlen(ref_name) + 1);
			strcpy(rm->name, ref_name);
			rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
			strcpy(rm->peer_ref->name, ref_name);
			hashcpy(rm->old_sha1, ref_sha1);

			*tail = rm;
			tail = &rm->next;
		}
		free(ref_name);
	}

	return ref_map;
}

static int do_fetch(struct transport *transport,
		    struct refspec *refs, int ref_count)
{
	struct ref *ref_map, *fetch_map;
	struct ref *rm;
	int autotags = (transport->remote->fetch_tags == 1);
	if (transport->remote->fetch_tags == 2 && !no_tags)
		tags = 1;
	if (transport->remote->fetch_tags == -1)
		no_tags = 1;

	if (!transport->get_refs_list || !transport->fetch)
		die("Don't know how to fetch from %s", transport->url);

	/* if not appending, truncate FETCH_HEAD */
	if (!append) {
		char *filename = git_path("FETCH_HEAD");
		FILE *fp = fopen(filename, "w");
		if (!fp)
			return error("cannot open %s: %s\n", filename, strerror(errno));
		fclose(fp);
	}

	ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);

	for (rm = ref_map; rm; rm = rm->next) {
		if (rm->peer_ref)
			read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
	}

	if (fetch_refs(transport, ref_map)) {
		free_refs(ref_map);
		return 1;
	}

	fetch_map = ref_map;

	/* if neither --no-tags nor --tags was specified, do automated tag
	 * following ... */
	if (!(tags || no_tags) && autotags) {
		ref_map = find_non_local_tags(transport, fetch_map);
		if (ref_map) {
			transport_set_option(transport, TRANS_OPT_DEPTH, "0");
			fetch_refs(transport, ref_map);
		}
		free_refs(ref_map);
	}

	free_refs(fetch_map);

	return 0;
}

static void set_option(const char *name, const char *value)
{
	int r = transport_set_option(transport, name, value);
	if (r < 0)
		die("Option \"%s\" value \"%s\" is not valid for %s\n",
			name, value, transport->url);
	if (r > 0)
		warning("Option \"%s\" is ignored for %s\n",
			name, transport->url);
}

int cmd_fetch(int argc, const char **argv, const char *prefix)
{
	struct remote *remote;
	int i, j, rla_offset;
	static const char **refs = NULL;
	int ref_nr = 0;
	int cmd_len = 0;
	const char *upload_pack = NULL;
	int keep = 0;

	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		cmd_len += strlen(arg);

		if (arg[0] != '-')
			break;
		if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
			append = 1;
			continue;
		}
		if (!prefixcmp(arg, "--upload-pack=")) {
			upload_pack = arg + 14;
			continue;
		}
		if (!strcmp(arg, "--upload-pack")) {
			i++;
			if (i == argc)
				usage(fetch_usage);
			upload_pack = argv[i];
			continue;
		}
		if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
			force = 1;
			continue;
		}
		if (!strcmp(arg, "--no-tags")) {
			no_tags = 1;
			continue;
		}
		if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
			tags = 1;
			continue;
		}
		if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
			keep = 1;
			continue;
		}
		if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
			update_head_ok = 1;
			continue;
		}
		if (!prefixcmp(arg, "--depth=")) {
			depth = arg + 8;
			continue;
		}
		if (!strcmp(arg, "--depth")) {
			i++;
			if (i == argc)
				usage(fetch_usage);
			depth = argv[i];
			continue;
		}
		if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
			quiet = 1;
			continue;
		}
		if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
			verbose++;
			continue;
		}
		usage(fetch_usage);
	}

	for (j = i; j < argc; j++)
		cmd_len += strlen(argv[j]);

	default_rla = xmalloc(cmd_len + 5 + argc + 1);
	sprintf(default_rla, "fetch");
	rla_offset = strlen(default_rla);
	for (j = 1; j < argc; j++) {
		sprintf(default_rla + rla_offset, " %s", argv[j]);
		rla_offset += strlen(argv[j]) + 1;
	}

	if (i == argc)
		remote = remote_get(NULL);
	else
		remote = remote_get(argv[i++]);

	transport = transport_get(remote, remote->url[0]);
	if (verbose >= 2)
		transport->verbose = 1;
	if (quiet)
		transport->verbose = -1;
	if (upload_pack)
		set_option(TRANS_OPT_UPLOADPACK, upload_pack);
	if (keep)
		set_option(TRANS_OPT_KEEP, "yes");
	if (depth)
		set_option(TRANS_OPT_DEPTH, depth);

	if (!transport->url)
		die("Where do you want to fetch from today?");

	if (i < argc) {
		int j = 0;
		refs = xcalloc(argc - i + 1, sizeof(const char *));
		while (i < argc) {
			if (!strcmp(argv[i], "tag")) {
				char *ref;
				i++;
				ref = xmalloc(strlen(argv[i]) * 2 + 22);
				strcpy(ref, "refs/tags/");
				strcat(ref, argv[i]);
				strcat(ref, ":refs/tags/");
				strcat(ref, argv[i]);
				refs[j++] = ref;
			} else
				refs[j++] = argv[i];
			i++;
		}
		refs[j] = NULL;
		ref_nr = j;
	}

	signal(SIGINT, unlock_pack_on_signal);
	atexit(unlock_pack);
	return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
}