transport-helper: drop read/write errno checks
[git.git] / archive.c
blobfd556c28e420732bbe625b68663f9099a5316f96
1 #include "cache.h"
2 #include "config.h"
3 #include "refs.h"
4 #include "object-store.h"
5 #include "commit.h"
6 #include "tree-walk.h"
7 #include "attr.h"
8 #include "archive.h"
9 #include "parse-options.h"
10 #include "unpack-trees.h"
11 #include "dir.h"
13 static char const * const archive_usage[] = {
14 N_("git archive [<options>] <tree-ish> [<path>...]"),
15 N_("git archive --list"),
16 N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
17 N_("git archive --remote <repo> [--exec <cmd>] --list"),
18 NULL
21 static const struct archiver **archivers;
22 static int nr_archivers;
23 static int alloc_archivers;
24 static int remote_allow_unreachable;
26 void register_archiver(struct archiver *ar)
28 ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
29 archivers[nr_archivers++] = ar;
32 void init_archivers(void)
34 init_tar_archiver();
35 init_zip_archiver();
38 static void format_subst(const struct commit *commit,
39 const char *src, size_t len,
40 struct strbuf *buf)
42 char *to_free = NULL;
43 struct strbuf fmt = STRBUF_INIT;
44 struct pretty_print_context ctx = {0};
45 ctx.date_mode.type = DATE_NORMAL;
46 ctx.abbrev = DEFAULT_ABBREV;
48 if (src == buf->buf)
49 to_free = strbuf_detach(buf, NULL);
50 for (;;) {
51 const char *b, *c;
53 b = memmem(src, len, "$Format:", 8);
54 if (!b)
55 break;
56 c = memchr(b + 8, '$', (src + len) - b - 8);
57 if (!c)
58 break;
60 strbuf_reset(&fmt);
61 strbuf_add(&fmt, b + 8, c - b - 8);
63 strbuf_add(buf, src, b - src);
64 format_commit_message(commit, fmt.buf, buf, &ctx);
65 len -= c + 1 - src;
66 src = c + 1;
68 strbuf_add(buf, src, len);
69 strbuf_release(&fmt);
70 free(to_free);
73 void *object_file_to_archive(const struct archiver_args *args,
74 const char *path, const struct object_id *oid,
75 unsigned int mode, enum object_type *type,
76 unsigned long *sizep)
78 void *buffer;
79 const struct commit *commit = args->convert ? args->commit : NULL;
81 path += args->baselen;
82 buffer = read_object_file(oid, type, sizep);
83 if (buffer && S_ISREG(mode)) {
84 struct strbuf buf = STRBUF_INIT;
85 size_t size = 0;
87 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
88 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf);
89 if (commit)
90 format_subst(commit, buf.buf, buf.len, &buf);
91 buffer = strbuf_detach(&buf, &size);
92 *sizep = size;
95 return buffer;
98 struct directory {
99 struct directory *up;
100 struct object_id oid;
101 int baselen, len;
102 unsigned mode;
103 int stage;
104 char path[FLEX_ARRAY];
107 struct archiver_context {
108 struct archiver_args *args;
109 write_archive_entry_fn_t write_entry;
110 struct directory *bottom;
113 static const struct attr_check *get_archive_attrs(struct index_state *istate,
114 const char *path)
116 static struct attr_check *check;
117 if (!check)
118 check = attr_check_initl("export-ignore", "export-subst", NULL);
119 git_check_attr(istate, path, check);
120 return check;
123 static int check_attr_export_ignore(const struct attr_check *check)
125 return check && ATTR_TRUE(check->items[0].value);
128 static int check_attr_export_subst(const struct attr_check *check)
130 return check && ATTR_TRUE(check->items[1].value);
133 static int write_archive_entry(const struct object_id *oid, const char *base,
134 int baselen, const char *filename, unsigned mode, int stage,
135 void *context)
137 static struct strbuf path = STRBUF_INIT;
138 struct archiver_context *c = context;
139 struct archiver_args *args = c->args;
140 write_archive_entry_fn_t write_entry = c->write_entry;
141 int err;
142 const char *path_without_prefix;
144 args->convert = 0;
145 strbuf_reset(&path);
146 strbuf_grow(&path, PATH_MAX);
147 strbuf_add(&path, args->base, args->baselen);
148 strbuf_add(&path, base, baselen);
149 strbuf_addstr(&path, filename);
150 if (S_ISDIR(mode) || S_ISGITLINK(mode))
151 strbuf_addch(&path, '/');
152 path_without_prefix = path.buf + args->baselen;
154 if (!S_ISDIR(mode)) {
155 const struct attr_check *check;
156 check = get_archive_attrs(args->repo->index, path_without_prefix);
157 if (check_attr_export_ignore(check))
158 return 0;
159 args->convert = check_attr_export_subst(check);
162 if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
163 if (args->verbose)
164 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
165 err = write_entry(args, oid, path.buf, path.len, mode);
166 if (err)
167 return err;
168 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
171 if (args->verbose)
172 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
173 return write_entry(args, oid, path.buf, path.len, mode);
176 static void queue_directory(const unsigned char *sha1,
177 struct strbuf *base, const char *filename,
178 unsigned mode, int stage, struct archiver_context *c)
180 struct directory *d;
181 size_t len = st_add4(base->len, 1, strlen(filename), 1);
182 d = xmalloc(st_add(sizeof(*d), len));
183 d->up = c->bottom;
184 d->baselen = base->len;
185 d->mode = mode;
186 d->stage = stage;
187 c->bottom = d;
188 d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
189 hashcpy(d->oid.hash, sha1);
192 static int write_directory(struct archiver_context *c)
194 struct directory *d = c->bottom;
195 int ret;
197 if (!d)
198 return 0;
199 c->bottom = d->up;
200 d->path[d->len - 1] = '\0'; /* no trailing slash */
201 ret =
202 write_directory(c) ||
203 write_archive_entry(&d->oid, d->path, d->baselen,
204 d->path + d->baselen, d->mode,
205 d->stage, c) != READ_TREE_RECURSIVE;
206 free(d);
207 return ret ? -1 : 0;
210 static int queue_or_write_archive_entry(const struct object_id *oid,
211 struct strbuf *base, const char *filename,
212 unsigned mode, int stage, void *context)
214 struct archiver_context *c = context;
216 while (c->bottom &&
217 !(base->len >= c->bottom->len &&
218 !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
219 struct directory *next = c->bottom->up;
220 free(c->bottom);
221 c->bottom = next;
224 if (S_ISDIR(mode)) {
225 size_t baselen = base->len;
226 const struct attr_check *check;
228 /* Borrow base, but restore its original value when done. */
229 strbuf_addstr(base, filename);
230 strbuf_addch(base, '/');
231 check = get_archive_attrs(c->args->repo->index, base->buf);
232 strbuf_setlen(base, baselen);
234 if (check_attr_export_ignore(check))
235 return 0;
236 queue_directory(oid->hash, base, filename,
237 mode, stage, c);
238 return READ_TREE_RECURSIVE;
241 if (write_directory(c))
242 return -1;
243 return write_archive_entry(oid, base->buf, base->len, filename, mode,
244 stage, context);
247 int write_archive_entries(struct archiver_args *args,
248 write_archive_entry_fn_t write_entry)
250 struct archiver_context context;
251 struct unpack_trees_options opts;
252 struct tree_desc t;
253 int err;
255 if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
256 size_t len = args->baselen;
258 while (len > 1 && args->base[len - 2] == '/')
259 len--;
260 if (args->verbose)
261 fprintf(stderr, "%.*s\n", (int)len, args->base);
262 err = write_entry(args, &args->tree->object.oid, args->base,
263 len, 040777);
264 if (err)
265 return err;
268 memset(&context, 0, sizeof(context));
269 context.args = args;
270 context.write_entry = write_entry;
273 * Setup index and instruct attr to read index only
275 if (!args->worktree_attributes) {
276 memset(&opts, 0, sizeof(opts));
277 opts.index_only = 1;
278 opts.head_idx = -1;
279 opts.src_index = args->repo->index;
280 opts.dst_index = args->repo->index;
281 opts.fn = oneway_merge;
282 init_tree_desc(&t, args->tree->buffer, args->tree->size);
283 if (unpack_trees(1, &t, &opts))
284 return -1;
285 git_attr_set_direction(GIT_ATTR_INDEX);
288 err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
289 queue_or_write_archive_entry,
290 &context);
291 if (err == READ_TREE_RECURSIVE)
292 err = 0;
293 while (context.bottom) {
294 struct directory *next = context.bottom->up;
295 free(context.bottom);
296 context.bottom = next;
298 return err;
301 static const struct archiver *lookup_archiver(const char *name)
303 int i;
305 if (!name)
306 return NULL;
308 for (i = 0; i < nr_archivers; i++) {
309 if (!strcmp(name, archivers[i]->name))
310 return archivers[i];
312 return NULL;
315 struct path_exists_context {
316 struct pathspec pathspec;
317 struct archiver_args *args;
320 static int reject_entry(const struct object_id *oid, struct strbuf *base,
321 const char *filename, unsigned mode,
322 int stage, void *context)
324 int ret = -1;
325 struct path_exists_context *ctx = context;
327 if (S_ISDIR(mode)) {
328 struct strbuf sb = STRBUF_INIT;
329 strbuf_addbuf(&sb, base);
330 strbuf_addstr(&sb, filename);
331 if (!match_pathspec(ctx->args->repo->index,
332 &ctx->pathspec,
333 sb.buf, sb.len, 0, NULL, 1))
334 ret = READ_TREE_RECURSIVE;
335 strbuf_release(&sb);
337 return ret;
340 static int path_exists(struct archiver_args *args, const char *path)
342 const char *paths[] = { path, NULL };
343 struct path_exists_context ctx;
344 int ret;
346 ctx.args = args;
347 parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
348 ctx.pathspec.recursive = 1;
349 ret = read_tree_recursive(args->tree, "", 0, 0, &ctx.pathspec,
350 reject_entry, &ctx);
351 clear_pathspec(&ctx.pathspec);
352 return ret != 0;
355 static void parse_pathspec_arg(const char **pathspec,
356 struct archiver_args *ar_args)
359 * must be consistent with parse_pathspec in path_exists()
360 * Also if pathspec patterns are dependent, we're in big
361 * trouble as we test each one separately
363 parse_pathspec(&ar_args->pathspec, 0,
364 PATHSPEC_PREFER_FULL,
365 "", pathspec);
366 ar_args->pathspec.recursive = 1;
367 if (pathspec) {
368 while (*pathspec) {
369 if (**pathspec && !path_exists(ar_args, *pathspec))
370 die(_("pathspec '%s' did not match any files"), *pathspec);
371 pathspec++;
376 static void parse_treeish_arg(const char **argv,
377 struct archiver_args *ar_args, const char *prefix,
378 int remote)
380 const char *name = argv[0];
381 const unsigned char *commit_sha1;
382 time_t archive_time;
383 struct tree *tree;
384 const struct commit *commit;
385 struct object_id oid;
387 /* Remotes are only allowed to fetch actual refs */
388 if (remote && !remote_allow_unreachable) {
389 char *ref = NULL;
390 const char *colon = strchrnul(name, ':');
391 int refnamelen = colon - name;
393 if (!dwim_ref(name, refnamelen, &oid, &ref))
394 die("no such ref: %.*s", refnamelen, name);
395 free(ref);
398 if (get_oid(name, &oid))
399 die("Not a valid object name");
401 commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
402 if (commit) {
403 commit_sha1 = commit->object.oid.hash;
404 archive_time = commit->date;
405 } else {
406 commit_sha1 = NULL;
407 archive_time = time(NULL);
410 tree = parse_tree_indirect(&oid);
411 if (tree == NULL)
412 die("not a tree object");
414 if (prefix) {
415 struct object_id tree_oid;
416 unsigned int mode;
417 int err;
419 err = get_tree_entry(&tree->object.oid, prefix, &tree_oid,
420 &mode);
421 if (err || !S_ISDIR(mode))
422 die("current working directory is untracked");
424 tree = parse_tree_indirect(&tree_oid);
426 ar_args->tree = tree;
427 ar_args->commit_sha1 = commit_sha1;
428 ar_args->commit = commit;
429 ar_args->time = archive_time;
432 #define OPT__COMPR(s, v, h, p) \
433 OPT_SET_INT_F(s, NULL, v, h, p, PARSE_OPT_NONEG)
434 #define OPT__COMPR_HIDDEN(s, v, p) \
435 OPT_SET_INT_F(s, NULL, v, "", p, PARSE_OPT_NONEG | PARSE_OPT_HIDDEN)
437 static int parse_archive_args(int argc, const char **argv,
438 const struct archiver **ar, struct archiver_args *args,
439 const char *name_hint, int is_remote)
441 const char *format = NULL;
442 const char *base = NULL;
443 const char *remote = NULL;
444 const char *exec = NULL;
445 const char *output = NULL;
446 int compression_level = -1;
447 int verbose = 0;
448 int i;
449 int list = 0;
450 int worktree_attributes = 0;
451 struct option opts[] = {
452 OPT_GROUP(""),
453 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
454 OPT_STRING(0, "prefix", &base, N_("prefix"),
455 N_("prepend prefix to each pathname in the archive")),
456 OPT_STRING('o', "output", &output, N_("file"),
457 N_("write the archive to this file")),
458 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
459 N_("read .gitattributes in working directory")),
460 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
461 OPT__COMPR('0', &compression_level, N_("store only"), 0),
462 OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
463 OPT__COMPR_HIDDEN('2', &compression_level, 2),
464 OPT__COMPR_HIDDEN('3', &compression_level, 3),
465 OPT__COMPR_HIDDEN('4', &compression_level, 4),
466 OPT__COMPR_HIDDEN('5', &compression_level, 5),
467 OPT__COMPR_HIDDEN('6', &compression_level, 6),
468 OPT__COMPR_HIDDEN('7', &compression_level, 7),
469 OPT__COMPR_HIDDEN('8', &compression_level, 8),
470 OPT__COMPR('9', &compression_level, N_("compress better"), 9),
471 OPT_GROUP(""),
472 OPT_BOOL('l', "list", &list,
473 N_("list supported archive formats")),
474 OPT_GROUP(""),
475 OPT_STRING(0, "remote", &remote, N_("repo"),
476 N_("retrieve the archive from remote repository <repo>")),
477 OPT_STRING(0, "exec", &exec, N_("command"),
478 N_("path to the remote git-upload-archive command")),
479 OPT_END()
482 argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
484 if (remote)
485 die(_("Unexpected option --remote"));
486 if (exec)
487 die(_("Option --exec can only be used together with --remote"));
488 if (output)
489 die(_("Unexpected option --output"));
491 if (!base)
492 base = "";
494 if (list) {
495 for (i = 0; i < nr_archivers; i++)
496 if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
497 printf("%s\n", archivers[i]->name);
498 exit(0);
501 if (!format && name_hint)
502 format = archive_format_from_filename(name_hint);
503 if (!format)
504 format = "tar";
506 /* We need at least one parameter -- tree-ish */
507 if (argc < 1)
508 usage_with_options(archive_usage, opts);
509 *ar = lookup_archiver(format);
510 if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
511 die(_("Unknown archive format '%s'"), format);
513 args->compression_level = Z_DEFAULT_COMPRESSION;
514 if (compression_level != -1) {
515 if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
516 args->compression_level = compression_level;
517 else {
518 die(_("Argument not supported for format '%s': -%d"),
519 format, compression_level);
522 args->verbose = verbose;
523 args->base = base;
524 args->baselen = strlen(base);
525 args->worktree_attributes = worktree_attributes;
527 return argc;
530 int write_archive(int argc, const char **argv, const char *prefix,
531 struct repository *repo,
532 const char *name_hint, int remote)
534 const struct archiver *ar = NULL;
535 struct archiver_args args;
537 git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
538 git_config(git_default_config, NULL);
540 args.repo = repo;
541 argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
542 if (!startup_info->have_repository) {
544 * We know this will die() with an error, so we could just
545 * die ourselves; but its error message will be more specific
546 * than what we could write here.
548 setup_git_directory();
551 parse_treeish_arg(argv, &args, prefix, remote);
552 parse_pathspec_arg(argv + 1, &args);
554 return ar->write_archive(ar, &args);
557 static int match_extension(const char *filename, const char *ext)
559 int prefixlen = strlen(filename) - strlen(ext);
562 * We need 1 character for the '.', and 1 character to ensure that the
563 * prefix is non-empty (k.e., we don't match .tar.gz with no actual
564 * filename).
566 if (prefixlen < 2 || filename[prefixlen - 1] != '.')
567 return 0;
568 return !strcmp(filename + prefixlen, ext);
571 const char *archive_format_from_filename(const char *filename)
573 int i;
575 for (i = 0; i < nr_archivers; i++)
576 if (match_extension(filename, archivers[i]->name))
577 return archivers[i]->name;
578 return NULL;