about summary refs log blame commit diff
path: root/third_party/git/archive.c
blob: a8da0fcc4f0cc47e585b3b378109fbd84496ed15 (plain) (tree)
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






































































































































































































































































































































































































































































































































































































                                                                                            
#include "cache.h"
#include "config.h"
#include "refs.h"
#include "object-store.h"
#include "commit.h"
#include "tree-walk.h"
#include "attr.h"
#include "archive.h"
#include "parse-options.h"
#include "unpack-trees.h"
#include "dir.h"

static char const * const archive_usage[] = {
	N_("git archive [<options>] <tree-ish> [<path>...]"),
	N_("git archive --list"),
	N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
	N_("git archive --remote <repo> [--exec <cmd>] --list"),
	NULL
};

static const struct archiver **archivers;
static int nr_archivers;
static int alloc_archivers;
static int remote_allow_unreachable;

void register_archiver(struct archiver *ar)
{
	ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
	archivers[nr_archivers++] = ar;
}

void init_archivers(void)
{
	init_tar_archiver();
	init_zip_archiver();
}

static void format_subst(const struct commit *commit,
			 const char *src, size_t len,
			 struct strbuf *buf)
{
	char *to_free = NULL;
	struct strbuf fmt = STRBUF_INIT;
	struct pretty_print_context ctx = {0};
	ctx.date_mode.type = DATE_NORMAL;
	ctx.abbrev = DEFAULT_ABBREV;

	if (src == buf->buf)
		to_free = strbuf_detach(buf, NULL);
	for (;;) {
		const char *b, *c;

		b = memmem(src, len, "$Format:", 8);
		if (!b)
			break;
		c = memchr(b + 8, '$', (src + len) - b - 8);
		if (!c)
			break;

		strbuf_reset(&fmt);
		strbuf_add(&fmt, b + 8, c - b - 8);

		strbuf_add(buf, src, b - src);
		format_commit_message(commit, fmt.buf, buf, &ctx);
		len -= c + 1 - src;
		src  = c + 1;
	}
	strbuf_add(buf, src, len);
	strbuf_release(&fmt);
	free(to_free);
}

void *object_file_to_archive(const struct archiver_args *args,
			     const char *path, const struct object_id *oid,
			     unsigned int mode, enum object_type *type,
			     unsigned long *sizep)
{
	void *buffer;
	const struct commit *commit = args->convert ? args->commit : NULL;

	path += args->baselen;
	buffer = read_object_file(oid, type, sizep);
	if (buffer && S_ISREG(mode)) {
		struct strbuf buf = STRBUF_INIT;
		size_t size = 0;

		strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
		convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf);
		if (commit)
			format_subst(commit, buf.buf, buf.len, &buf);
		buffer = strbuf_detach(&buf, &size);
		*sizep = size;
	}

	return buffer;
}

struct directory {
	struct directory *up;
	struct object_id oid;
	int baselen, len;
	unsigned mode;
	int stage;
	char path[FLEX_ARRAY];
};

struct archiver_context {
	struct archiver_args *args;
	write_archive_entry_fn_t write_entry;
	struct directory *bottom;
};

static const struct attr_check *get_archive_attrs(struct index_state *istate,
						  const char *path)
{
	static struct attr_check *check;
	if (!check)
		check = attr_check_initl("export-ignore", "export-subst", NULL);
	git_check_attr(istate, path, check);
	return check;
}

static int check_attr_export_ignore(const struct attr_check *check)
{
	return check && ATTR_TRUE(check->items[0].value);
}

static int check_attr_export_subst(const struct attr_check *check)
{
	return check && ATTR_TRUE(check->items[1].value);
}

static int write_archive_entry(const struct object_id *oid, const char *base,
		int baselen, const char *filename, unsigned mode, int stage,
		void *context)
{
	static struct strbuf path = STRBUF_INIT;
	struct archiver_context *c = context;
	struct archiver_args *args = c->args;
	write_archive_entry_fn_t write_entry = c->write_entry;
	int err;
	const char *path_without_prefix;

	args->convert = 0;
	strbuf_reset(&path);
	strbuf_grow(&path, PATH_MAX);
	strbuf_add(&path, args->base, args->baselen);
	strbuf_add(&path, base, baselen);
	strbuf_addstr(&path, filename);
	if (S_ISDIR(mode) || S_ISGITLINK(mode))
		strbuf_addch(&path, '/');
	path_without_prefix = path.buf + args->baselen;

	if (!S_ISDIR(mode)) {
		const struct attr_check *check;
		check = get_archive_attrs(args->repo->index, path_without_prefix);
		if (check_attr_export_ignore(check))
			return 0;
		args->convert = check_attr_export_subst(check);
	}

	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
		if (args->verbose)
			fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
		err = write_entry(args, oid, path.buf, path.len, mode);
		if (err)
			return err;
		return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
	}

	if (args->verbose)
		fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
	return write_entry(args, oid, path.buf, path.len, mode);
}

static void queue_directory(const unsigned char *sha1,
		struct strbuf *base, const char *filename,
		unsigned mode, int stage, struct archiver_context *c)
{
	struct directory *d;
	size_t len = st_add4(base->len, 1, strlen(filename), 1);
	d = xmalloc(st_add(sizeof(*d), len));
	d->up	   = c->bottom;
	d->baselen = base->len;
	d->mode	   = mode;
	d->stage   = stage;
	c->bottom  = d;
	d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
	hashcpy(d->oid.hash, sha1);
}

static int write_directory(struct archiver_context *c)
{
	struct directory *d = c->bottom;
	int ret;

	if (!d)
		return 0;
	c->bottom = d->up;
	d->path[d->len - 1] = '\0'; /* no trailing slash */
	ret =
		write_directory(c) ||
		write_archive_entry(&d->oid, d->path, d->baselen,
				    d->path + d->baselen, d->mode,
				    d->stage, c) != READ_TREE_RECURSIVE;
	free(d);
	return ret ? -1 : 0;
}

static int queue_or_write_archive_entry(const struct object_id *oid,
		struct strbuf *base, const char *filename,
		unsigned mode, int stage, void *context)
{
	struct archiver_context *c = context;

	while (c->bottom &&
	       !(base->len >= c->bottom->len &&
		 !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
		struct directory *next = c->bottom->up;
		free(c->bottom);
		c->bottom = next;
	}

	if (S_ISDIR(mode)) {
		size_t baselen = base->len;
		const struct attr_check *check;

		/* Borrow base, but restore its original value when done. */
		strbuf_addstr(base, filename);
		strbuf_addch(base, '/');
		check = get_archive_attrs(c->args->repo->index, base->buf);
		strbuf_setlen(base, baselen);

		if (check_attr_export_ignore(check))
			return 0;
		queue_directory(oid->hash, base, filename,
				mode, stage, c);
		return READ_TREE_RECURSIVE;
	}

	if (write_directory(c))
		return -1;
	return write_archive_entry(oid, base->buf, base->len, filename, mode,
				   stage, context);
}

int write_archive_entries(struct archiver_args *args,
		write_archive_entry_fn_t write_entry)
{
	struct archiver_context context;
	struct unpack_trees_options opts;
	struct tree_desc t;
	int err;

	if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
		size_t len = args->baselen;

		while (len > 1 && args->base[len - 2] == '/')
			len--;
		if (args->verbose)
			fprintf(stderr, "%.*s\n", (int)len, args->base);
		err = write_entry(args, &args->tree->object.oid, args->base,
				  len, 040777);
		if (err)
			return err;
	}

	memset(&context, 0, sizeof(context));
	context.args = args;
	context.write_entry = write_entry;

	/*
	 * Setup index and instruct attr to read index only
	 */
	if (!args->worktree_attributes) {
		memset(&opts, 0, sizeof(opts));
		opts.index_only = 1;
		opts.head_idx = -1;
		opts.src_index = args->repo->index;
		opts.dst_index = args->repo->index;
		opts.fn = oneway_merge;
		init_tree_desc(&t, args->tree->buffer, args->tree->size);
		if (unpack_trees(1, &t, &opts))
			return -1;
		git_attr_set_direction(GIT_ATTR_INDEX);
	}

	err = read_tree_recursive(args->repo, args->tree, "",
				  0, 0, &args->pathspec,
				  queue_or_write_archive_entry,
				  &context);
	if (err == READ_TREE_RECURSIVE)
		err = 0;
	while (context.bottom) {
		struct directory *next = context.bottom->up;
		free(context.bottom);
		context.bottom = next;
	}
	return err;
}

static const struct archiver *lookup_archiver(const char *name)
{
	int i;

	if (!name)
		return NULL;

	for (i = 0; i < nr_archivers; i++) {
		if (!strcmp(name, archivers[i]->name))
			return archivers[i];
	}
	return NULL;
}

struct path_exists_context {
	struct pathspec pathspec;
	struct archiver_args *args;
};

static int reject_entry(const struct object_id *oid, struct strbuf *base,
			const char *filename, unsigned mode,
			int stage, void *context)
{
	int ret = -1;
	struct path_exists_context *ctx = context;

	if (S_ISDIR(mode)) {
		struct strbuf sb = STRBUF_INIT;
		strbuf_addbuf(&sb, base);
		strbuf_addstr(&sb, filename);
		if (!match_pathspec(ctx->args->repo->index,
				    &ctx->pathspec,
				    sb.buf, sb.len, 0, NULL, 1))
			ret = READ_TREE_RECURSIVE;
		strbuf_release(&sb);
	}
	return ret;
}

static int path_exists(struct archiver_args *args, const char *path)
{
	const char *paths[] = { path, NULL };
	struct path_exists_context ctx;
	int ret;

	ctx.args = args;
	parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
	ctx.pathspec.recursive = 1;
	ret = read_tree_recursive(args->repo, args->tree, "",
				  0, 0, &ctx.pathspec,
				  reject_entry, &ctx);
	clear_pathspec(&ctx.pathspec);
	return ret != 0;
}

static void parse_pathspec_arg(const char **pathspec,
		struct archiver_args *ar_args)
{
	/*
	 * must be consistent with parse_pathspec in path_exists()
	 * Also if pathspec patterns are dependent, we're in big
	 * trouble as we test each one separately
	 */
	parse_pathspec(&ar_args->pathspec, 0,
		       PATHSPEC_PREFER_FULL,
		       "", pathspec);
	ar_args->pathspec.recursive = 1;
	if (pathspec) {
		while (*pathspec) {
			if (**pathspec && !path_exists(ar_args, *pathspec))
				die(_("pathspec '%s' did not match any files"), *pathspec);
			pathspec++;
		}
	}
}

static void parse_treeish_arg(const char **argv,
		struct archiver_args *ar_args, const char *prefix,
		int remote)
{
	const char *name = argv[0];
	const struct object_id *commit_oid;
	time_t archive_time;
	struct tree *tree;
	const struct commit *commit;
	struct object_id oid;

	/* Remotes are only allowed to fetch actual refs */
	if (remote && !remote_allow_unreachable) {
		char *ref = NULL;
		const char *colon = strchrnul(name, ':');
		int refnamelen = colon - name;

		if (!dwim_ref(name, refnamelen, &oid, &ref))
			die(_("no such ref: %.*s"), refnamelen, name);
		free(ref);
	}

	if (get_oid(name, &oid))
		die(_("not a valid object name: %s"), name);

	commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
	if (commit) {
		commit_oid = &commit->object.oid;
		archive_time = commit->date;
	} else {
		commit_oid = NULL;
		archive_time = time(NULL);
	}

	tree = parse_tree_indirect(&oid);
	if (tree == NULL)
		die(_("not a tree object: %s"), oid_to_hex(&oid));

	if (prefix) {
		struct object_id tree_oid;
		unsigned short mode;
		int err;

		err = get_tree_entry(ar_args->repo,
				     &tree->object.oid,
				     prefix, &tree_oid,
				     &mode);
		if (err || !S_ISDIR(mode))
			die(_("current working directory is untracked"));

		tree = parse_tree_indirect(&tree_oid);
	}
	ar_args->tree = tree;
	ar_args->commit_oid = commit_oid;
	ar_args->commit = commit;
	ar_args->time = archive_time;
}

#define OPT__COMPR(s, v, h, p) \
	OPT_SET_INT_F(s, NULL, v, h, p, PARSE_OPT_NONEG)
#define OPT__COMPR_HIDDEN(s, v, p) \
	OPT_SET_INT_F(s, NULL, v, "", p, PARSE_OPT_NONEG | PARSE_OPT_HIDDEN)

static int parse_archive_args(int argc, const char **argv,
		const struct archiver **ar, struct archiver_args *args,
		const char *name_hint, int is_remote)
{
	const char *format = NULL;
	const char *base = NULL;
	const char *remote = NULL;
	const char *exec = NULL;
	const char *output = NULL;
	int compression_level = -1;
	int verbose = 0;
	int i;
	int list = 0;
	int worktree_attributes = 0;
	struct option opts[] = {
		OPT_GROUP(""),
		OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
		OPT_STRING(0, "prefix", &base, N_("prefix"),
			N_("prepend prefix to each pathname in the archive")),
		OPT_STRING('o', "output", &output, N_("file"),
			N_("write the archive to this file")),
		OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
			N_("read .gitattributes in working directory")),
		OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
		OPT__COMPR('0', &compression_level, N_("store only"), 0),
		OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
		OPT__COMPR_HIDDEN('2', &compression_level, 2),
		OPT__COMPR_HIDDEN('3', &compression_level, 3),
		OPT__COMPR_HIDDEN('4', &compression_level, 4),
		OPT__COMPR_HIDDEN('5', &compression_level, 5),
		OPT__COMPR_HIDDEN('6', &compression_level, 6),
		OPT__COMPR_HIDDEN('7', &compression_level, 7),
		OPT__COMPR_HIDDEN('8', &compression_level, 8),
		OPT__COMPR('9', &compression_level, N_("compress better"), 9),
		OPT_GROUP(""),
		OPT_BOOL('l', "list", &list,
			N_("list supported archive formats")),
		OPT_GROUP(""),
		OPT_STRING(0, "remote", &remote, N_("repo"),
			N_("retrieve the archive from remote repository <repo>")),
		OPT_STRING(0, "exec", &exec, N_("command"),
			N_("path to the remote git-upload-archive command")),
		OPT_END()
	};

	argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);

	if (remote)
		die(_("Unexpected option --remote"));
	if (exec)
		die(_("Option --exec can only be used together with --remote"));
	if (output)
		die(_("Unexpected option --output"));

	if (!base)
		base = "";

	if (list) {
		for (i = 0; i < nr_archivers; i++)
			if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
				printf("%s\n", archivers[i]->name);
		exit(0);
	}

	if (!format && name_hint)
		format = archive_format_from_filename(name_hint);
	if (!format)
		format = "tar";

	/* We need at least one parameter -- tree-ish */
	if (argc < 1)
		usage_with_options(archive_usage, opts);
	*ar = lookup_archiver(format);
	if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
		die(_("Unknown archive format '%s'"), format);

	args->compression_level = Z_DEFAULT_COMPRESSION;
	if (compression_level != -1) {
		if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
			args->compression_level = compression_level;
		else {
			die(_("Argument not supported for format '%s': -%d"),
					format, compression_level);
		}
	}
	args->verbose = verbose;
	args->base = base;
	args->baselen = strlen(base);
	args->worktree_attributes = worktree_attributes;

	return argc;
}

int write_archive(int argc, const char **argv, const char *prefix,
		  struct repository *repo,
		  const char *name_hint, int remote)
{
	const struct archiver *ar = NULL;
	struct archiver_args args;

	git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
	git_config(git_default_config, NULL);

	args.repo = repo;
	argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
	if (!startup_info->have_repository) {
		/*
		 * We know this will die() with an error, so we could just
		 * die ourselves; but its error message will be more specific
		 * than what we could write here.
		 */
		setup_git_directory();
	}

	parse_treeish_arg(argv, &args, prefix, remote);
	parse_pathspec_arg(argv + 1, &args);

	return ar->write_archive(ar, &args);
}

static int match_extension(const char *filename, const char *ext)
{
	int prefixlen = strlen(filename) - strlen(ext);

	/*
	 * We need 1 character for the '.', and 1 character to ensure that the
	 * prefix is non-empty (k.e., we don't match .tar.gz with no actual
	 * filename).
	 */
	if (prefixlen < 2 || filename[prefixlen - 1] != '.')
		return 0;
	return !strcmp(filename + prefixlen, ext);
}

const char *archive_format_from_filename(const char *filename)
{
	int i;

	for (i = 0; i < nr_archivers; i++)
		if (match_extension(filename, archivers[i]->name))
			return archivers[i]->name;
	return NULL;
}