local.c 15.4 KB
Newer Older
Vicent Marti committed
1
/*
Edward Thomson committed
2
 * Copyright (C) the libgit2 contributors. All rights reserved.
Vicent Marti committed
3 4 5 6
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
7 8 9 10
#include "common.h"
#include "git2/types.h"
#include "git2/net.h"
#include "git2/repository.h"
11 12
#include "git2/object.h"
#include "git2/tag.h"
13
#include "git2/transport.h"
14 15 16 17 18
#include "git2/revwalk.h"
#include "git2/odb_backend.h"
#include "git2/pack.h"
#include "git2/commit.h"
#include "git2/revparse.h"
19
#include "git2/push.h"
20 21
#include "pack-objects.h"
#include "refs.h"
22
#include "posix.h"
23 24
#include "path.h"
#include "buffer.h"
25 26
#include "repository.h"
#include "odb.h"
27 28
#include "push.h"
#include "remote.h"
29

30
typedef struct {
31
	git_transport parent;
32
	git_remote *owner;
33 34 35 36
	char *url;
	int direction;
	int flags;
	git_atomic cancelled;
37
	git_repository *repo;
38
	git_vector refs;
39 40
	unsigned connected : 1,
		have_refs : 1;
41
} transport_local;
42

43
static int add_ref(transport_local *t, const char *name)
44 45
{
	const char peeled[] = "^{}";
46
	git_oid head_oid;
47
	git_remote_head *head;
48 49
	git_object *obj = NULL, *target = NULL;
	git_buf buf = GIT_BUF_INIT;
50
	int error;
51

52
	error = git_reference_name_to_id(&head_oid, t->repo, name);
53
	if (error < 0) {
54
		if (!strcmp(name, GIT_HEAD_FILE) && error == GIT_ENOTFOUND) {
55 56
			/* This is actually okay.  Empty repos often have a HEAD that
			 * points to a nonexistent "refs/heads/master". */
57 58 59 60
			giterr_clear();
			return 0;
		}
		return error;
61 62
	}

63 64 65 66 67 68 69 70 71
	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, &head_oid);

	if ((error = git_vector_insert(&t->refs, head)) < 0) {
72 73
		git__free(head->name);
		git__free(head);
74
		return error;
75
	}
76 77 78

	/* If it's not a tag, we don't need to try to peel it */
	if (git__prefixcmp(name, GIT_REFS_TAGS_DIR))
79
		return 0;
80

81 82
	if ((error = git_object_lookup(&obj, t->repo, &head->oid, GIT_OBJ_ANY)) < 0)
		return error;
83

84 85
	head = NULL;

86 87 88 89
	/* 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) {
90 91 92
		git_object_free(obj);
		return 0;
	}
93 94

	/* And if it's a tag, peel it, and add it to the list */
95
	head = git__calloc(1, sizeof(git_remote_head));
96
	GITERR_CHECK_ALLOC(head);
97

98 99 100
	if (git_buf_join(&buf, 0, name, peeled) < 0)
		return -1;
	head->name = git_buf_detach(&buf);
101

102 103
	if (!(error = git_tag_peel(&target, (git_tag *)obj))) {
		git_oid_cpy(&head->oid, git_object_id(target));
104

105 106 107 108 109
		if ((error = git_vector_insert(&t->refs, head)) < 0) {
			git__free(head->name);
			git__free(head);
		}
	}
110

111
	git_object_free(obj);
112
	git_object_free(target);
113 114

	return error;
115 116
}

117
static int store_refs(transport_local *t)
118
{
119 120
	size_t i;
	git_remote_head *head;
121
	git_strarray ref_names = {0};
122

123
	assert(t);
124

125
	if (git_reference_list(&ref_names, t->repo) < 0)
126
		goto on_error;
127

128 129 130 131 132 133 134 135 136
	/* 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);

137
	/* Sort the references first */
138
	git__tsort((void **)ref_names.strings, ref_names.count, &git__strcmp_cb);
139

140 141
	/* Add HEAD iff direction is fetch */
	if (t->direction == GIT_DIRECTION_FETCH && add_ref(t, GIT_HEAD_FILE) < 0)
142
		goto on_error;
143

144
	for (i = 0; i < ref_names.count; ++i) {
145 146
		if (add_ref(t, ref_names.strings[i]) < 0)
			goto on_error;
147
	}
148

149
	t->have_refs = 1;
150
	git_strarray_free(&ref_names);
151 152 153
	return 0;

on_error:
154
	git_vector_free(&t->refs);
155
	git_strarray_free(&ref_names);
156
	return -1;
157
}
158

159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176
static int path_from_url_or_path(git_buf *local_path_out, const char *url_or_path)
{
	int error;

	/* If url_or_path begins with file:// treat it as a URL */
	if (!git__prefixcmp(url_or_path, "file://")) {
		if ((error = git_path_fromurl(local_path_out, url_or_path)) < 0) {
			return error;
		}
	} else { /* We assume url_or_path is already a path */
		if ((error = git_buf_sets(local_path_out, url_or_path)) < 0) {
			return error;
		}
	}

	return 0;
}

177 178 179 180
/*
 * Try to open the url as a git directory. The direction doesn't
 * matter in this case because we're calulating the heads ourselves.
 */
181 182 183 184
static int local_connect(
	git_transport *transport,
	const char *url,
	git_cred_acquire_cb cred_acquire_cb,
185
	void *cred_acquire_payload,
186
	int direction, int flags)
187 188 189 190 191
{
	git_repository *repo;
	int error;
	transport_local *t = (transport_local *) transport;
	const char *path;
192 193
	git_buf buf = GIT_BUF_INIT;

194
	GIT_UNUSED(cred_acquire_cb);
195
	GIT_UNUSED(cred_acquire_payload);
196

197 198 199 200
	t->url = git__strdup(url);
	GITERR_CHECK_ALLOC(t->url);
	t->direction = direction;
	t->flags = flags;
201

202 203 204 205
	/* 'url' may be a url or path; convert to a path */
	if ((error = path_from_url_or_path(&buf, url)) < 0) {
		git_buf_free(&buf);
		return error;
206
	}
207
	path = git_buf_cstr(&buf);
208 209

	error = git_repository_open(&repo, path);
210 211 212

	git_buf_free(&buf);

213 214
	if (error < 0)
		return -1;
215

216 217
	t->repo = repo;

218 219
	if (store_refs(t) < 0)
		return -1;
220

221 222 223 224 225
	t->connected = 1;

	return 0;
}

226
static int local_ls(const git_remote_head ***out, size_t *size, git_transport *transport)
227 228 229
{
	transport_local *t = (transport_local *)transport;

230 231
	if (!t->have_refs) {
		giterr_set(GITERR_NET, "The transport has not yet loaded the refs");
232 233 234
		return -1;
	}

235
	*out = (const git_remote_head **)t->refs.contents;
236
	*size = t->refs.length;
237

238
	return 0;
239 240
}

241 242 243
static int local_negotiate_fetch(
	git_transport *transport,
	git_repository *repo,
244 245
	const git_remote_head * const *refs,
	size_t count)
246
{
247 248 249 250
	transport_local *t = (transport_local*)transport;
	git_remote_head *rhead;
	unsigned int i;

251 252
	GIT_UNUSED(refs);
	GIT_UNUSED(count);
253

254 255 256 257 258 259 260 261 262
	/* 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;
263 264
		else
			giterr_clear();
nulltoken committed
265
		git_object_free(obj);
266 267 268 269 270
	}

	return 0;
}

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
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;

297
	if (git_odb_stream_write(odb_stream, (char *)git_odb_object_data(odb_obj),
298
		odb_obj_size) < 0 ||
299
		git_odb_stream_finalize_write(&remote_odb_obj_oid, odb_stream) < 0) {
300
		error = -1;
301
	} else if (git_oid__cmp(&obj->id, &remote_odb_obj_oid) != 0) {
302 303 304 305 306 307
		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;
	}

308
	git_odb_stream_free(odb_stream);
309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330

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,
331
				!git_oid_iszero(roid), NULL, NULL)) < 0)
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
			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;
360 361
	const char *path;
	git_buf buf = GIT_BUF_INIT;
362 363 364 365
	int error;
	unsigned int i;
	size_t j;

366 367 368 369
	/* 'push->remote->url' may be a url or path; convert to a path */
	if ((error = path_from_url_or_path(&buf, push->remote->url)) < 0) {
		git_buf_free(&buf);
		return error;
370
	}
371
	path = git_buf_cstr(&buf);
372 373 374 375 376 377

	error = git_repository_open(&remote_repo, path);

	git_buf_free(&buf);

	if (error < 0)
378 379
		return error;

nulltoken committed
380
	/* We don't currently support pushing locally to non-bare repos. Proper
381 382 383
	   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) {
384 385
		error = GIT_EBAREREPO;
		giterr_set(GITERR_INVALID, "Local push doesn't (yet) support pushing to non-bare repos.");
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
		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,
457
			push->remote->callbacks.credentials, NULL, GIT_DIRECTION_PUSH, flags))
458 459 460 461 462 463 464 465 466 467 468 469
			goto on_error;
	}

	error = 0;

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

	return error;
}

470 471 472 473 474 475 476 477 478 479 480 481
typedef struct foreach_data {
	git_transfer_progress *stats;
	git_transfer_progress_callback 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;
482
	return data->writepack->append(data->writepack, buf, len, data->stats);
483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499
}

static int local_download_pack(
		git_transport *transport,
		git_repository *repo,
		git_transfer_progress *stats,
		git_transfer_progress_callback 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;
500
	git_odb *odb = NULL;
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

	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);
		}
Linquize committed
528
		git_object_free(obj);
529 530 531
	}

	/* Walk the objects, building a packfile */
532 533
	if ((error = git_repository_odb__weakptr(&odb, repo)) < 0)
		goto cleanup;
534 535 536 537

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

538 539 540
		/* Skip commits we already have */
		if (git_odb_exists(odb, &oid)) continue;

541
		if (!git_object_lookup((git_object**)&commit, t->repo, &oid, GIT_OBJ_COMMIT)) {
Vicent Marti committed
542
			const git_oid *tree_oid = git_commit_tree_id(commit);
543 544 545

			/* Add the commit and its tree */
			if ((error = git_packbuilder_insert(pack, &oid, NULL)) < 0 ||
546 547
				 (error = git_packbuilder_insert_tree(pack, tree_oid)) < 0) {
				git_commit_free(commit);
548
				goto cleanup;
549 550 551
			}

			git_commit_free(commit);
552 553 554
		}
	}

555
	if ((error = git_odb_write_pack(&writepack, odb, progress_cb, progress_payload)) != 0)
556
		goto cleanup;
557 558 559 560 561 562 563 564 565

	/* 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;

566
		if ((error = git_packbuilder_foreach(pack, foreach_cb, &data)) != 0)
567 568 569 570 571 572 573 574 575
			goto cleanup;
	}
	error = writepack->commit(writepack, stats);

cleanup:
	if (writepack) writepack->free(writepack);
	git_packbuilder_free(pack);
	git_revwalk_free(walk);
	return error;
576 577
}

578
static int local_is_connected(git_transport *transport)
579 580 581
{
	transport_local *t = (transport_local *)transport;

582
	return t->connected;
583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600
}

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);
}

601
static int local_close(git_transport *transport)
602
{
603 604
	transport_local *t = (transport_local *)transport;

605
	t->connected = 0;
606 607 608 609 610 611 612 613 614 615

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

	if (t->url) {
		git__free(t->url);
		t->url = NULL;
	}
616

617
	return 0;
618 619
}

620 621
static void local_free(git_transport *transport)
{
622
	transport_local *t = (transport_local *)transport;
623 624 625 626 627 628 629
	size_t i;
	git_remote_head *head;

	git_vector_foreach(&t->refs, i, head) {
		git__free(head->name);
		git__free(head);
	}
630

631 632
	git_vector_free(&t->refs);

633 634
	/* Close the transport, if it's still open. */
	local_close(transport);
635

636
	/* Free the transport */
637
	git__free(t);
638 639
}

640 641 642 643
/**************
 * Public API *
 **************/

644
int git_transport_local(git_transport **out, git_remote *owner, void *param)
645
{
646 647
	transport_local *t;

648 649
	GIT_UNUSED(param);

650
	t = git__calloc(1, sizeof(transport_local));
651
	GITERR_CHECK_ALLOC(t);
652

653
	t->parent.version = GIT_TRANSPORT_VERSION;
654
	t->parent.connect = local_connect;
655
	t->parent.negotiate_fetch = local_negotiate_fetch;
656
	t->parent.download_pack = local_download_pack;
657
	t->parent.push = local_push;
658 659
	t->parent.close = local_close;
	t->parent.free = local_free;
660 661 662 663
	t->parent.ls = local_ls;
	t->parent.is_connected = local_is_connected;
	t->parent.read_flags = local_read_flags;
	t->parent.cancel = local_cancel;
664

665
	git_vector_init(&t->refs, 0, NULL);
666 667
	t->owner = owner;

668
	*out = (git_transport *) t;
669

670
	return 0;
671
}