summaryrefslogtreecommitdiff
path: root/src/transports/local.c
blob: f859f0b7080725e7104e86c9ae87c9622681a932 (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
/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
#include "common.h"
#include "git2/types.h"
#include "git2/net.h"
#include "git2/repository.h"
#include "git2/object.h"
#include "git2/tag.h"
#include "git2/transport.h"
#include "git2/revwalk.h"
#include "git2/odb_backend.h"
#include "git2/pack.h"
#include "git2/commit.h"
#include "git2/revparse.h"
#include "git2/push.h"
#include "pack-objects.h"
#include "refs.h"
#include "posix.h"
#include "path.h"
#include "buffer.h"
#include "repository.h"
#include "odb.h"
#include "push.h"
#include "remote.h"

typedef struct {
	git_transport parent;
	git_remote *owner;
	char *url;
	int direction;
	int flags;
	git_atomic cancelled;
	git_repository *repo;
	git_vector refs;
	unsigned connected : 1,
		have_refs : 1;
} transport_local;

static void free_head(git_remote_head *head)
{
	git__free(head->name);
	git__free(head->symref_target);
	git__free(head);
}

static int add_ref(transport_local *t, const char *name)
{
	const char peeled[] = "^{}";
	git_reference *ref, *resolved;
	git_remote_head *head;
	git_oid obj_id;
	git_object *obj = NULL, *target = NULL;
	git_buf buf = GIT_BUF_INIT;
	int error;

	if ((error = git_reference_lookup(&ref, t->repo, name)) < 0)
		return error;

	error = git_reference_resolve(&resolved, ref);
	if (error < 0) {
		git_reference_free(ref);
		if (!strcmp(name, GIT_HEAD_FILE) && error == GIT_ENOTFOUND) {
			/* This is actually okay.  Empty repos often have a HEAD that
			 * points to a nonexistent "refs/heads/master". */
			giterr_clear();
			return 0;
		}
		return error;
	}

	git_oid_cpy(&obj_id, git_reference_target(resolved));
	git_reference_free(resolved);

	head = git__calloc(1, sizeof(git_remote_head));
	GITERR_CHECK_ALLOC(head);

	head->name = git__strdup(name);
	GITERR_CHECK_ALLOC(head->name);

	git_oid_cpy(&head->oid, &obj_id);

	if (git_reference_type(ref) == GIT_REF_SYMBOLIC) {
		head->symref_target = git__strdup(git_reference_symbolic_target(ref));
		GITERR_CHECK_ALLOC(head->symref_target);
	}
	git_reference_free(ref);

	if ((error = git_vector_insert(&t->refs, head)) < 0) {
		free_head(head);
		return error;
	}

	/* If it's not a tag, we don't need to try to peel it */
	if (git__prefixcmp(name, GIT_REFS_TAGS_DIR))
		return 0;

	if ((error = git_object_lookup(&obj, t->repo, &head->oid, GIT_OBJ_ANY)) < 0)
		return error;

	head = NULL;

	/* If it's not an annotated tag, or if we're mocking
	 * git-receive-pack, just get out */
	if (git_object_type(obj) != GIT_OBJ_TAG ||
		t->direction != GIT_DIRECTION_FETCH) {
		git_object_free(obj);
		return 0;
	}

	/* And if it's a tag, peel it, and add it to the list */
	head = git__calloc(1, sizeof(git_remote_head));
	GITERR_CHECK_ALLOC(head);

	if (git_buf_join(&buf, 0, name, peeled) < 0)
		return -1;
	head->name = git_buf_detach(&buf);

	if (!(error = git_tag_peel(&target, (git_tag *)obj))) {
		git_oid_cpy(&head->oid, git_object_id(target));

		if ((error = git_vector_insert(&t->refs, head)) < 0) {
			free_head(head);
		}
	}

	git_object_free(obj);
	git_object_free(target);

	return error;
}

static int store_refs(transport_local *t)
{
	size_t i;
	git_remote_head *head;
	git_strarray ref_names = {0};

	assert(t);

	if (git_reference_list(&ref_names, t->repo) < 0)
		goto on_error;

	/* Clear all heads we might have fetched in a previous connect */
	git_vector_foreach(&t->refs, i, head) {
		git__free(head->name);
		git__free(head);
	}

	/* Clear the vector so we can reuse it */
	git_vector_clear(&t->refs);

	/* Sort the references first */
	git__tsort((void **)ref_names.strings, ref_names.count, &git__strcmp_cb);

	/* Add HEAD iff direction is fetch */
	if (t->direction == GIT_DIRECTION_FETCH && add_ref(t, GIT_HEAD_FILE) < 0)
		goto on_error;

	for (i = 0; i < ref_names.count; ++i) {
		if (add_ref(t, ref_names.strings[i]) < 0)
			goto on_error;
	}

	t->have_refs = 1;
	git_strarray_free(&ref_names);
	return 0;

on_error:
	git_vector_free(&t->refs);
	git_strarray_free(&ref_names);
	return -1;
}

/*
 * Try to open the url as a git directory. The direction doesn't
 * matter in this case because we're calculating the heads ourselves.
 */
static int local_connect(
	git_transport *transport,
	const char *url,
	git_cred_acquire_cb cred_acquire_cb,
	void *cred_acquire_payload,
	int direction, int flags)
{
	git_repository *repo;
	int error;
	transport_local *t = (transport_local *) transport;
	const char *path;
	git_buf buf = GIT_BUF_INIT;

	GIT_UNUSED(cred_acquire_cb);
	GIT_UNUSED(cred_acquire_payload);

	if (t->connected)
		return 0;

	t->url = git__strdup(url);
	GITERR_CHECK_ALLOC(t->url);
	t->direction = direction;
	t->flags = flags;

	/* 'url' may be a url or path; convert to a path */
	if ((error = git_path_from_url_or_path(&buf, url)) < 0) {
		git_buf_free(&buf);
		return error;
	}
	path = git_buf_cstr(&buf);

	error = git_repository_open(&repo, path);

	git_buf_free(&buf);

	if (error < 0)
		return -1;

	t->repo = repo;

	if (store_refs(t) < 0)
		return -1;

	t->connected = 1;

	return 0;
}

static int local_ls(const git_remote_head ***out, size_t *size, git_transport *transport)
{
	transport_local *t = (transport_local *)transport;

	if (!t->have_refs) {
		giterr_set(GITERR_NET, "The transport has not yet loaded the refs");
		return -1;
	}

	*out = (const git_remote_head **)t->refs.contents;
	*size = t->refs.length;

	return 0;
}

static int local_negotiate_fetch(
	git_transport *transport,
	git_repository *repo,
	const git_remote_head * const *refs,
	size_t count)
{
	transport_local *t = (transport_local*)transport;
	git_remote_head *rhead;
	unsigned int i;

	GIT_UNUSED(refs);
	GIT_UNUSED(count);

	/* Fill in the loids */
	git_vector_foreach(&t->refs, i, rhead) {
		git_object *obj;

		int error = git_revparse_single(&obj, repo, rhead->name);
		if (!error)
			git_oid_cpy(&rhead->loid, git_object_id(obj));
		else if (error != GIT_ENOTFOUND)
			return error;
		else
			giterr_clear();
		git_object_free(obj);
	}

	return 0;
}

static int local_push_copy_object(
	git_odb *local_odb,
	git_odb *remote_odb,
	git_pobject *obj)
{
	int error = 0;
	git_odb_object *odb_obj = NULL;
	git_odb_stream *odb_stream;
	size_t odb_obj_size;
	git_otype odb_obj_type;
	git_oid remote_odb_obj_oid;

	/* Object already exists in the remote ODB; do nothing and return 0*/
	if (git_odb_exists(remote_odb, &obj->id))
		return 0;

	if ((error = git_odb_read(&odb_obj, local_odb, &obj->id)) < 0)
		return error;

	odb_obj_size = git_odb_object_size(odb_obj);
	odb_obj_type = git_odb_object_type(odb_obj);

	if ((error = git_odb_open_wstream(&odb_stream, remote_odb,
		odb_obj_size, odb_obj_type)) < 0)
		goto on_error;

	if (git_odb_stream_write(odb_stream, (char *)git_odb_object_data(odb_obj),
		odb_obj_size) < 0 ||
		git_odb_stream_finalize_write(&remote_odb_obj_oid, odb_stream) < 0) {
		error = -1;
	} else if (git_oid__cmp(&obj->id, &remote_odb_obj_oid) != 0) {
		giterr_set(GITERR_ODB, "Error when writing object to remote odb "
			"during local push operation. Remote odb object oid does not "
			"match local oid.");
		error = -1;
	}

	git_odb_stream_free(odb_stream);

on_error:
	git_odb_object_free(odb_obj);
	return error;
}

static int local_push_update_remote_ref(
	git_repository *remote_repo,
	const char *lref,
	const char *rref,
	git_oid *loid,
	git_oid *roid)
{
	int error;
	git_reference *remote_ref = NULL;

	/* rref will be NULL if it is implicit in the pushspec (e.g. 'b1:') */
	rref = rref ? rref : lref;

	if (lref) {
		/* Create or update a ref */
		if ((error = git_reference_create(NULL, remote_repo, rref, loid,
				!git_oid_iszero(roid), NULL, NULL)) < 0)
			return error;
	} else {
		/* Delete a ref */
		if ((error = git_reference_lookup(&remote_ref, remote_repo, rref)) < 0) {
			if (error == GIT_ENOTFOUND)
				error = 0;
			return error;
		}

		if ((error = git_reference_delete(remote_ref)) < 0)
			return error;

		git_reference_free(remote_ref);
	}

	return 0;
}

static int local_push(
	git_transport *transport,
	git_push *push)
{
	transport_local *t = (transport_local *)transport;
	git_odb *remote_odb = NULL;
	git_odb *local_odb = NULL;
	git_repository *remote_repo = NULL;
	push_spec *spec;
	char *url = NULL;
	const char *path;
	git_buf buf = GIT_BUF_INIT;
	int error;
	unsigned int i;
	size_t j;

	/* 'push->remote->url' may be a url or path; convert to a path */
	if ((error = git_path_from_url_or_path(&buf, push->remote->url)) < 0) {
		git_buf_free(&buf);
		return error;
	}
	path = git_buf_cstr(&buf);

	error = git_repository_open(&remote_repo, path);

	git_buf_free(&buf);

	if (error < 0)
		return error;

	/* We don't currently support pushing locally to non-bare repos. Proper
	   non-bare repo push support would require checking configs to see if
	   we should override the default 'don't let this happen' behavior */
	if (!remote_repo->is_bare) {
		error = GIT_EBAREREPO;
		giterr_set(GITERR_INVALID, "Local push doesn't (yet) support pushing to non-bare repos.");
		goto on_error;
	}

	if ((error = git_repository_odb__weakptr(&remote_odb, remote_repo)) < 0 ||
		(error = git_repository_odb__weakptr(&local_odb, push->repo)) < 0)
		goto on_error;

	for (i = 0; i < push->pb->nr_objects; i++) {
		if ((error = local_push_copy_object(local_odb, remote_odb,
			&push->pb->object_list[i])) < 0)
			goto on_error;
	}

	push->unpack_ok = 1;

	git_vector_foreach(&push->specs, j, spec) {
		push_status *status;
		const git_error *last;
		char *ref = spec->rref ? spec->rref : spec->lref;

		status = git__calloc(sizeof(push_status), 1);
		if (!status)
			goto on_error;

		status->ref = git__strdup(ref);
		if (!status->ref) {
			git_push_status_free(status);
			goto on_error;
		}

		error = local_push_update_remote_ref(remote_repo, spec->lref, spec->rref,
			&spec->loid, &spec->roid);

		switch (error) {
			case GIT_OK:
				break;
			case GIT_EINVALIDSPEC:
				status->msg = git__strdup("funny refname");
				break;
			case GIT_ENOTFOUND:
				status->msg = git__strdup("Remote branch not found to delete");
				break;
			default:
				last = giterr_last();

				if (last && last->message)
					status->msg = git__strdup(last->message);
				else
					status->msg = git__strdup("Unspecified error encountered");
				break;
		}

		/* failed to allocate memory for a status message */
		if (error < 0 && !status->msg) {
			git_push_status_free(status);
			goto on_error;
		}

		/* failed to insert the ref update status */
		if ((error = git_vector_insert(&push->status, status)) < 0) {
			git_push_status_free(status);
			goto on_error;
		}
	}

	if (push->specs.length) {
		int flags = t->flags;
		url = git__strdup(t->url);

		if (!url || t->parent.close(&t->parent) < 0 ||
			t->parent.connect(&t->parent, url,
			push->remote->callbacks.credentials, NULL, GIT_DIRECTION_PUSH, flags))
			goto on_error;
	}

	error = 0;

on_error:
	git_repository_free(remote_repo);
	git__free(url);

	return error;
}

typedef struct foreach_data {
	git_transfer_progress *stats;
	git_transfer_progress_cb progress_cb;
	void *progress_payload;
	git_odb_writepack *writepack;
} foreach_data;

static int foreach_cb(void *buf, size_t len, void *payload)
{
	foreach_data *data = (foreach_data*)payload;

	data->stats->received_bytes += len;
	return data->writepack->append(data->writepack, buf, len, data->stats);
}

static int local_download_pack(
		git_transport *transport,
		git_repository *repo,
		git_transfer_progress *stats,
		git_transfer_progress_cb progress_cb,
		void *progress_payload)
{
	transport_local *t = (transport_local*)transport;
	git_revwalk *walk = NULL;
	git_remote_head *rhead;
	unsigned int i;
	int error = -1;
	git_oid oid;
	git_packbuilder *pack = NULL;
	git_odb_writepack *writepack = NULL;
	git_odb *odb = NULL;

	if ((error = git_revwalk_new(&walk, t->repo)) < 0)
		goto cleanup;
	git_revwalk_sorting(walk, GIT_SORT_TIME);

	if ((error = git_packbuilder_new(&pack, t->repo)) < 0)
		goto cleanup;

	stats->total_objects = 0;
	stats->indexed_objects = 0;
	stats->received_objects = 0;
	stats->received_bytes = 0;

	git_vector_foreach(&t->refs, i, rhead) {
		git_object *obj;
		if ((error = git_object_lookup(&obj, t->repo, &rhead->oid, GIT_OBJ_ANY)) < 0)
			goto cleanup;

		if (git_object_type(obj) == GIT_OBJ_COMMIT) {
			/* Revwalker includes only wanted commits */
			error = git_revwalk_push(walk, &rhead->oid);
			if (!git_oid_iszero(&rhead->loid))
				error = git_revwalk_hide(walk, &rhead->loid);
		} else {
			/* Tag or some other wanted object. Add it on its own */
			error = git_packbuilder_insert(pack, &rhead->oid, rhead->name);
		}
		git_object_free(obj);
	}

	/* Walk the objects, building a packfile */
	if ((error = git_repository_odb__weakptr(&odb, repo)) < 0)
		goto cleanup;

	while ((error = git_revwalk_next(&oid, walk)) == 0) {
		git_commit *commit;

		/* Skip commits we already have */
		if (git_odb_exists(odb, &oid)) continue;

		if (!git_object_lookup((git_object**)&commit, t->repo, &oid, GIT_OBJ_COMMIT)) {
			const git_oid *tree_oid = git_commit_tree_id(commit);

			/* Add the commit and its tree */
			if ((error = git_packbuilder_insert(pack, &oid, NULL)) < 0 ||
				 (error = git_packbuilder_insert_tree(pack, tree_oid)) < 0) {
				git_commit_free(commit);
				goto cleanup;
			}

			git_commit_free(commit);
		}
	}

	if ((error = git_odb_write_pack(&writepack, odb, progress_cb, progress_payload)) != 0)
		goto cleanup;

	/* Write the data to the ODB */
	{
		foreach_data data = {0};
		data.stats = stats;
		data.progress_cb = progress_cb;
		data.progress_payload = progress_payload;
		data.writepack = writepack;

		if ((error = git_packbuilder_foreach(pack, foreach_cb, &data)) != 0)
			goto cleanup;
	}
	error = writepack->commit(writepack, stats);

cleanup:
	if (writepack) writepack->free(writepack);
	git_packbuilder_free(pack);
	git_revwalk_free(walk);
	return error;
}

static int local_is_connected(git_transport *transport)
{
	transport_local *t = (transport_local *)transport;

	return t->connected;
}

static int local_read_flags(git_transport *transport, int *flags)
{
	transport_local *t = (transport_local *)transport;

	*flags = t->flags;

	return 0;
}

static void local_cancel(git_transport *transport)
{
	transport_local *t = (transport_local *)transport;

	git_atomic_set(&t->cancelled, 1);
}

static int local_close(git_transport *transport)
{
	transport_local *t = (transport_local *)transport;

	t->connected = 0;

	if (t->repo) {
		git_repository_free(t->repo);
		t->repo = NULL;
	}

	if (t->url) {
		git__free(t->url);
		t->url = NULL;
	}

	return 0;
}

static void local_free(git_transport *transport)
{
	transport_local *t = (transport_local *)transport;
	size_t i;
	git_remote_head *head;

	git_vector_foreach(&t->refs, i, head)
		free_head(head);

	git_vector_free(&t->refs);

	/* Close the transport, if it's still open. */
	local_close(transport);

	/* Free the transport */
	git__free(t);
}

/**************
 * Public API *
 **************/

int git_transport_local(git_transport **out, git_remote *owner, void *param)
{
	transport_local *t;

	GIT_UNUSED(param);

	t = git__calloc(1, sizeof(transport_local));
	GITERR_CHECK_ALLOC(t);

	t->parent.version = GIT_TRANSPORT_VERSION;
	t->parent.connect = local_connect;
	t->parent.negotiate_fetch = local_negotiate_fetch;
	t->parent.download_pack = local_download_pack;
	t->parent.push = local_push;
	t->parent.close = local_close;
	t->parent.free = local_free;
	t->parent.ls = local_ls;
	t->parent.is_connected = local_is_connected;
	t->parent.read_flags = local_read_flags;
	t->parent.cancel = local_cancel;

	git_vector_init(&t->refs, 0, NULL);
	t->owner = owner;

	*out = (git_transport *) t;

	return 0;
}