Merge branch 'sb/line-log-plug-pairdiff-leak'
[git] / archive.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "tree-walk.h"
4 #include "attr.h"
5 #include "archive.h"
6 #include "parse-options.h"
7 #include "unpack-trees.h"
8 #include "dir.h"
9
10 static char const * const archive_usage[] = {
11         N_("git archive [<options>] <tree-ish> [<path>...]"),
12         N_("git archive --list"),
13         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
14         N_("git archive --remote <repo> [--exec <cmd>] --list"),
15         NULL
16 };
17
18 static const struct archiver **archivers;
19 static int nr_archivers;
20 static int alloc_archivers;
21 static int remote_allow_unreachable;
22
23 void register_archiver(struct archiver *ar)
24 {
25         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
26         archivers[nr_archivers++] = ar;
27 }
28
29 static void format_subst(const struct commit *commit,
30                          const char *src, size_t len,
31                          struct strbuf *buf)
32 {
33         char *to_free = NULL;
34         struct strbuf fmt = STRBUF_INIT;
35         struct pretty_print_context ctx = {0};
36         ctx.date_mode = DATE_NORMAL;
37         ctx.abbrev = DEFAULT_ABBREV;
38
39         if (src == buf->buf)
40                 to_free = strbuf_detach(buf, NULL);
41         for (;;) {
42                 const char *b, *c;
43
44                 b = memmem(src, len, "$Format:", 8);
45                 if (!b)
46                         break;
47                 c = memchr(b + 8, '$', (src + len) - b - 8);
48                 if (!c)
49                         break;
50
51                 strbuf_reset(&fmt);
52                 strbuf_add(&fmt, b + 8, c - b - 8);
53
54                 strbuf_add(buf, src, b - src);
55                 format_commit_message(commit, fmt.buf, buf, &ctx);
56                 len -= c + 1 - src;
57                 src  = c + 1;
58         }
59         strbuf_add(buf, src, len);
60         strbuf_release(&fmt);
61         free(to_free);
62 }
63
64 void *sha1_file_to_archive(const struct archiver_args *args,
65                            const char *path, const unsigned char *sha1,
66                            unsigned int mode, enum object_type *type,
67                            unsigned long *sizep)
68 {
69         void *buffer;
70         const struct commit *commit = args->convert ? args->commit : NULL;
71
72         path += args->baselen;
73         buffer = read_sha1_file(sha1, type, sizep);
74         if (buffer && S_ISREG(mode)) {
75                 struct strbuf buf = STRBUF_INIT;
76                 size_t size = 0;
77
78                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
79                 convert_to_working_tree(path, buf.buf, buf.len, &buf);
80                 if (commit)
81                         format_subst(commit, buf.buf, buf.len, &buf);
82                 buffer = strbuf_detach(&buf, &size);
83                 *sizep = size;
84         }
85
86         return buffer;
87 }
88
89 static void setup_archive_check(struct git_attr_check *check)
90 {
91         static struct git_attr *attr_export_ignore;
92         static struct git_attr *attr_export_subst;
93
94         if (!attr_export_ignore) {
95                 attr_export_ignore = git_attr("export-ignore");
96                 attr_export_subst = git_attr("export-subst");
97         }
98         check[0].attr = attr_export_ignore;
99         check[1].attr = attr_export_subst;
100 }
101
102 struct directory {
103         struct directory *up;
104         struct object_id oid;
105         int baselen, len;
106         unsigned mode;
107         int stage;
108         char path[FLEX_ARRAY];
109 };
110
111 struct archiver_context {
112         struct archiver_args *args;
113         write_archive_entry_fn_t write_entry;
114         struct directory *bottom;
115 };
116
117 static int write_archive_entry(const unsigned char *sha1, const char *base,
118                 int baselen, const char *filename, unsigned mode, int stage,
119                 void *context)
120 {
121         static struct strbuf path = STRBUF_INIT;
122         struct archiver_context *c = context;
123         struct archiver_args *args = c->args;
124         write_archive_entry_fn_t write_entry = c->write_entry;
125         struct git_attr_check check[2];
126         const char *path_without_prefix;
127         int err;
128
129         args->convert = 0;
130         strbuf_reset(&path);
131         strbuf_grow(&path, PATH_MAX);
132         strbuf_add(&path, args->base, args->baselen);
133         strbuf_add(&path, base, baselen);
134         strbuf_addstr(&path, filename);
135         if (S_ISDIR(mode) || S_ISGITLINK(mode))
136                 strbuf_addch(&path, '/');
137         path_without_prefix = path.buf + args->baselen;
138
139         setup_archive_check(check);
140         if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
141                 if (ATTR_TRUE(check[0].value))
142                         return 0;
143                 args->convert = ATTR_TRUE(check[1].value);
144         }
145
146         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
147                 if (args->verbose)
148                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
149                 err = write_entry(args, sha1, path.buf, path.len, mode);
150                 if (err)
151                         return err;
152                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
153         }
154
155         if (args->verbose)
156                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
157         return write_entry(args, sha1, path.buf, path.len, mode);
158 }
159
160 static int write_archive_entry_buf(const unsigned char *sha1, struct strbuf *base,
161                 const char *filename, unsigned mode, int stage,
162                 void *context)
163 {
164         return write_archive_entry(sha1, base->buf, base->len,
165                                      filename, mode, stage, context);
166 }
167
168 static void queue_directory(const unsigned char *sha1,
169                 struct strbuf *base, const char *filename,
170                 unsigned mode, int stage, struct archiver_context *c)
171 {
172         struct directory *d;
173         d = xmallocz(sizeof(*d) + base->len + 1 + strlen(filename));
174         d->up      = c->bottom;
175         d->baselen = base->len;
176         d->mode    = mode;
177         d->stage   = stage;
178         c->bottom  = d;
179         d->len = sprintf(d->path, "%.*s%s/", (int)base->len, base->buf, filename);
180         hashcpy(d->oid.hash, sha1);
181 }
182
183 static int write_directory(struct archiver_context *c)
184 {
185         struct directory *d = c->bottom;
186         int ret;
187
188         if (!d)
189                 return 0;
190         c->bottom = d->up;
191         d->path[d->len - 1] = '\0'; /* no trailing slash */
192         ret =
193                 write_directory(c) ||
194                 write_archive_entry(d->oid.hash, d->path, d->baselen,
195                                     d->path + d->baselen, d->mode,
196                                     d->stage, c) != READ_TREE_RECURSIVE;
197         free(d);
198         return ret ? -1 : 0;
199 }
200
201 static int queue_or_write_archive_entry(const unsigned char *sha1,
202                 struct strbuf *base, const char *filename,
203                 unsigned mode, int stage, void *context)
204 {
205         struct archiver_context *c = context;
206
207         while (c->bottom &&
208                !(base->len >= c->bottom->len &&
209                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
210                 struct directory *next = c->bottom->up;
211                 free(c->bottom);
212                 c->bottom = next;
213         }
214
215         if (S_ISDIR(mode)) {
216                 queue_directory(sha1, base, filename,
217                                 mode, stage, c);
218                 return READ_TREE_RECURSIVE;
219         }
220
221         if (write_directory(c))
222                 return -1;
223         return write_archive_entry(sha1, base->buf, base->len, filename, mode,
224                                    stage, context);
225 }
226
227 int write_archive_entries(struct archiver_args *args,
228                 write_archive_entry_fn_t write_entry)
229 {
230         struct archiver_context context;
231         struct unpack_trees_options opts;
232         struct tree_desc t;
233         int err;
234
235         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
236                 size_t len = args->baselen;
237
238                 while (len > 1 && args->base[len - 2] == '/')
239                         len--;
240                 if (args->verbose)
241                         fprintf(stderr, "%.*s\n", (int)len, args->base);
242                 err = write_entry(args, args->tree->object.sha1, args->base,
243                                   len, 040777);
244                 if (err)
245                         return err;
246         }
247
248         memset(&context, 0, sizeof(context));
249         context.args = args;
250         context.write_entry = write_entry;
251
252         /*
253          * Setup index and instruct attr to read index only
254          */
255         if (!args->worktree_attributes) {
256                 memset(&opts, 0, sizeof(opts));
257                 opts.index_only = 1;
258                 opts.head_idx = -1;
259                 opts.src_index = &the_index;
260                 opts.dst_index = &the_index;
261                 opts.fn = oneway_merge;
262                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
263                 if (unpack_trees(1, &t, &opts))
264                         return -1;
265                 git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
266         }
267
268         err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
269                                   args->pathspec.has_wildcard ?
270                                   queue_or_write_archive_entry :
271                                   write_archive_entry_buf,
272                                   &context);
273         if (err == READ_TREE_RECURSIVE)
274                 err = 0;
275         while (context.bottom) {
276                 struct directory *next = context.bottom->up;
277                 free(context.bottom);
278                 context.bottom = next;
279         }
280         return err;
281 }
282
283 static const struct archiver *lookup_archiver(const char *name)
284 {
285         int i;
286
287         if (!name)
288                 return NULL;
289
290         for (i = 0; i < nr_archivers; i++) {
291                 if (!strcmp(name, archivers[i]->name))
292                         return archivers[i];
293         }
294         return NULL;
295 }
296
297 static int reject_entry(const unsigned char *sha1, struct strbuf *base,
298                         const char *filename, unsigned mode,
299                         int stage, void *context)
300 {
301         int ret = -1;
302         if (S_ISDIR(mode)) {
303                 struct strbuf sb = STRBUF_INIT;
304                 strbuf_addbuf(&sb, base);
305                 strbuf_addstr(&sb, filename);
306                 if (!match_pathspec(context, sb.buf, sb.len, 0, NULL, 1))
307                         ret = READ_TREE_RECURSIVE;
308                 strbuf_release(&sb);
309         }
310         return ret;
311 }
312
313 static int path_exists(struct tree *tree, const char *path)
314 {
315         const char *paths[] = { path, NULL };
316         struct pathspec pathspec;
317         int ret;
318
319         parse_pathspec(&pathspec, 0, 0, "", paths);
320         pathspec.recursive = 1;
321         ret = read_tree_recursive(tree, "", 0, 0, &pathspec,
322                                   reject_entry, &pathspec);
323         free_pathspec(&pathspec);
324         return ret != 0;
325 }
326
327 static void parse_pathspec_arg(const char **pathspec,
328                 struct archiver_args *ar_args)
329 {
330         /*
331          * must be consistent with parse_pathspec in path_exists()
332          * Also if pathspec patterns are dependent, we're in big
333          * trouble as we test each one separately
334          */
335         parse_pathspec(&ar_args->pathspec, 0,
336                        PATHSPEC_PREFER_FULL,
337                        "", pathspec);
338         ar_args->pathspec.recursive = 1;
339         if (pathspec) {
340                 while (*pathspec) {
341                         if (**pathspec && !path_exists(ar_args->tree, *pathspec))
342                                 die(_("pathspec '%s' did not match any files"), *pathspec);
343                         pathspec++;
344                 }
345         }
346 }
347
348 static void parse_treeish_arg(const char **argv,
349                 struct archiver_args *ar_args, const char *prefix,
350                 int remote)
351 {
352         const char *name = argv[0];
353         const unsigned char *commit_sha1;
354         time_t archive_time;
355         struct tree *tree;
356         const struct commit *commit;
357         struct object_id oid;
358
359         /* Remotes are only allowed to fetch actual refs */
360         if (remote && !remote_allow_unreachable) {
361                 char *ref = NULL;
362                 const char *colon = strchrnul(name, ':');
363                 int refnamelen = colon - name;
364
365                 if (!dwim_ref(name, refnamelen, oid.hash, &ref))
366                         die("no such ref: %.*s", refnamelen, name);
367                 free(ref);
368         }
369
370         if (get_sha1(name, oid.hash))
371                 die("Not a valid object name");
372
373         commit = lookup_commit_reference_gently(oid.hash, 1);
374         if (commit) {
375                 commit_sha1 = commit->object.sha1;
376                 archive_time = commit->date;
377         } else {
378                 commit_sha1 = NULL;
379                 archive_time = time(NULL);
380         }
381
382         tree = parse_tree_indirect(oid.hash);
383         if (tree == NULL)
384                 die("not a tree object");
385
386         if (prefix) {
387                 struct object_id tree_oid;
388                 unsigned int mode;
389                 int err;
390
391                 err = get_tree_entry(tree->object.sha1, prefix,
392                                      tree_oid.hash, &mode);
393                 if (err || !S_ISDIR(mode))
394                         die("current working directory is untracked");
395
396                 tree = parse_tree_indirect(tree_oid.hash);
397         }
398         ar_args->tree = tree;
399         ar_args->commit_sha1 = commit_sha1;
400         ar_args->commit = commit;
401         ar_args->time = archive_time;
402 }
403
404 #define OPT__COMPR(s, v, h, p) \
405         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
406           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
407 #define OPT__COMPR_HIDDEN(s, v, p) \
408         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
409           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
410
411 static int parse_archive_args(int argc, const char **argv,
412                 const struct archiver **ar, struct archiver_args *args,
413                 const char *name_hint, int is_remote)
414 {
415         const char *format = NULL;
416         const char *base = NULL;
417         const char *remote = NULL;
418         const char *exec = NULL;
419         const char *output = NULL;
420         int compression_level = -1;
421         int verbose = 0;
422         int i;
423         int list = 0;
424         int worktree_attributes = 0;
425         struct option opts[] = {
426                 OPT_GROUP(""),
427                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
428                 OPT_STRING(0, "prefix", &base, N_("prefix"),
429                         N_("prepend prefix to each pathname in the archive")),
430                 OPT_STRING('o', "output", &output, N_("file"),
431                         N_("write the archive to this file")),
432                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
433                         N_("read .gitattributes in working directory")),
434                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
435                 OPT__COMPR('0', &compression_level, N_("store only"), 0),
436                 OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
437                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
438                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
439                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
440                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
441                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
442                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
443                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
444                 OPT__COMPR('9', &compression_level, N_("compress better"), 9),
445                 OPT_GROUP(""),
446                 OPT_BOOL('l', "list", &list,
447                         N_("list supported archive formats")),
448                 OPT_GROUP(""),
449                 OPT_STRING(0, "remote", &remote, N_("repo"),
450                         N_("retrieve the archive from remote repository <repo>")),
451                 OPT_STRING(0, "exec", &exec, N_("command"),
452                         N_("path to the remote git-upload-archive command")),
453                 OPT_END()
454         };
455
456         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
457
458         if (remote)
459                 die("Unexpected option --remote");
460         if (exec)
461                 die("Option --exec can only be used together with --remote");
462         if (output)
463                 die("Unexpected option --output");
464
465         if (!base)
466                 base = "";
467
468         if (list) {
469                 for (i = 0; i < nr_archivers; i++)
470                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
471                                 printf("%s\n", archivers[i]->name);
472                 exit(0);
473         }
474
475         if (!format && name_hint)
476                 format = archive_format_from_filename(name_hint);
477         if (!format)
478                 format = "tar";
479
480         /* We need at least one parameter -- tree-ish */
481         if (argc < 1)
482                 usage_with_options(archive_usage, opts);
483         *ar = lookup_archiver(format);
484         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
485                 die("Unknown archive format '%s'", format);
486
487         args->compression_level = Z_DEFAULT_COMPRESSION;
488         if (compression_level != -1) {
489                 if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
490                         args->compression_level = compression_level;
491                 else {
492                         die("Argument not supported for format '%s': -%d",
493                                         format, compression_level);
494                 }
495         }
496         args->verbose = verbose;
497         args->base = base;
498         args->baselen = strlen(base);
499         args->worktree_attributes = worktree_attributes;
500
501         return argc;
502 }
503
504 int write_archive(int argc, const char **argv, const char *prefix,
505                   int setup_prefix, const char *name_hint, int remote)
506 {
507         int nongit = 0;
508         const struct archiver *ar = NULL;
509         struct archiver_args args;
510
511         if (setup_prefix && prefix == NULL)
512                 prefix = setup_git_directory_gently(&nongit);
513
514         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
515         git_config(git_default_config, NULL);
516
517         init_tar_archiver();
518         init_zip_archiver();
519
520         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
521         if (nongit) {
522                 /*
523                  * We know this will die() with an error, so we could just
524                  * die ourselves; but its error message will be more specific
525                  * than what we could write here.
526                  */
527                 setup_git_directory();
528         }
529
530         parse_treeish_arg(argv, &args, prefix, remote);
531         parse_pathspec_arg(argv + 1, &args);
532
533         return ar->write_archive(ar, &args);
534 }
535
536 static int match_extension(const char *filename, const char *ext)
537 {
538         int prefixlen = strlen(filename) - strlen(ext);
539
540         /*
541          * We need 1 character for the '.', and 1 character to ensure that the
542          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
543          * filename).
544          */
545         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
546                 return 0;
547         return !strcmp(filename + prefixlen, ext);
548 }
549
550 const char *archive_format_from_filename(const char *filename)
551 {
552         int i;
553
554         for (i = 0; i < nr_archivers; i++)
555                 if (match_extension(filename, archivers[i]->name))
556                         return archivers[i]->name;
557         return NULL;
558 }