Merge branch 'jk/in-pack-size-measurement'
[git] / builtin / tag.c
1 /*
2  * Builtin "git tag"
3  *
4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
5  *                    Carlos Rica <jasampler@gmail.com>
6  * Based on git-tag.sh and mktag.c by Linus Torvalds.
7  */
8
9 #include "cache.h"
10 #include "builtin.h"
11 #include "refs.h"
12 #include "tag.h"
13 #include "run-command.h"
14 #include "parse-options.h"
15 #include "diff.h"
16 #include "revision.h"
17 #include "gpg-interface.h"
18 #include "sha1-array.h"
19 #include "column.h"
20
21 static const char * const git_tag_usage[] = {
22         N_("git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]"),
23         N_("git tag -d <tagname>..."),
24         N_("git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>] "
25                 "\n\t\t[<pattern>...]"),
26         N_("git tag -v <tagname>..."),
27         NULL
28 };
29
30 struct tag_filter {
31         const char **patterns;
32         int lines;
33         struct commit_list *with_commit;
34 };
35
36 static struct sha1_array points_at;
37 static unsigned int colopts;
38
39 static int match_pattern(const char **patterns, const char *ref)
40 {
41         /* no pattern means match everything */
42         if (!*patterns)
43                 return 1;
44         for (; *patterns; patterns++)
45                 if (!fnmatch(*patterns, ref, 0))
46                         return 1;
47         return 0;
48 }
49
50 static const unsigned char *match_points_at(const char *refname,
51                                             const unsigned char *sha1)
52 {
53         const unsigned char *tagged_sha1 = NULL;
54         struct object *obj;
55
56         if (sha1_array_lookup(&points_at, sha1) >= 0)
57                 return sha1;
58         obj = parse_object(sha1);
59         if (!obj)
60                 die(_("malformed object at '%s'"), refname);
61         if (obj->type == OBJ_TAG)
62                 tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
63         if (tagged_sha1 && sha1_array_lookup(&points_at, tagged_sha1) >= 0)
64                 return tagged_sha1;
65         return NULL;
66 }
67
68 static int in_commit_list(const struct commit_list *want, struct commit *c)
69 {
70         for (; want; want = want->next)
71                 if (!hashcmp(want->item->object.sha1, c->object.sha1))
72                         return 1;
73         return 0;
74 }
75
76 static int contains_recurse(struct commit *candidate,
77                             const struct commit_list *want)
78 {
79         struct commit_list *p;
80
81         /* was it previously marked as containing a want commit? */
82         if (candidate->object.flags & TMP_MARK)
83                 return 1;
84         /* or marked as not possibly containing a want commit? */
85         if (candidate->object.flags & UNINTERESTING)
86                 return 0;
87         /* or are we it? */
88         if (in_commit_list(want, candidate))
89                 return 1;
90
91         if (parse_commit(candidate) < 0)
92                 return 0;
93
94         /* Otherwise recurse and mark ourselves for future traversals. */
95         for (p = candidate->parents; p; p = p->next) {
96                 if (contains_recurse(p->item, want)) {
97                         candidate->object.flags |= TMP_MARK;
98                         return 1;
99                 }
100         }
101         candidate->object.flags |= UNINTERESTING;
102         return 0;
103 }
104
105 static int contains(struct commit *candidate, const struct commit_list *want)
106 {
107         return contains_recurse(candidate, want);
108 }
109
110 static void show_tag_lines(const unsigned char *sha1, int lines)
111 {
112         int i;
113         unsigned long size;
114         enum object_type type;
115         char *buf, *sp, *eol;
116         size_t len;
117
118         buf = read_sha1_file(sha1, &type, &size);
119         if (!buf)
120                 die_errno("unable to read object %s", sha1_to_hex(sha1));
121         if (type != OBJ_COMMIT && type != OBJ_TAG)
122                 goto free_return;
123         if (!size)
124                 die("an empty %s object %s?",
125                     typename(type), sha1_to_hex(sha1));
126
127         /* skip header */
128         sp = strstr(buf, "\n\n");
129         if (!sp)
130                 goto free_return;
131
132         /* only take up to "lines" lines, and strip the signature from a tag */
133         if (type == OBJ_TAG)
134                 size = parse_signature(buf, size);
135         for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
136                 if (i)
137                         printf("\n    ");
138                 eol = memchr(sp, '\n', size - (sp - buf));
139                 len = eol ? eol - sp : size - (sp - buf);
140                 fwrite(sp, len, 1, stdout);
141                 if (!eol)
142                         break;
143                 sp = eol + 1;
144         }
145 free_return:
146         free(buf);
147 }
148
149 static int show_reference(const char *refname, const unsigned char *sha1,
150                           int flag, void *cb_data)
151 {
152         struct tag_filter *filter = cb_data;
153
154         if (match_pattern(filter->patterns, refname)) {
155                 if (filter->with_commit) {
156                         struct commit *commit;
157
158                         commit = lookup_commit_reference_gently(sha1, 1);
159                         if (!commit)
160                                 return 0;
161                         if (!contains(commit, filter->with_commit))
162                                 return 0;
163                 }
164
165                 if (points_at.nr && !match_points_at(refname, sha1))
166                         return 0;
167
168                 if (!filter->lines) {
169                         printf("%s\n", refname);
170                         return 0;
171                 }
172                 printf("%-15s ", refname);
173                 show_tag_lines(sha1, filter->lines);
174                 putchar('\n');
175         }
176
177         return 0;
178 }
179
180 static int list_tags(const char **patterns, int lines,
181                         struct commit_list *with_commit)
182 {
183         struct tag_filter filter;
184
185         filter.patterns = patterns;
186         filter.lines = lines;
187         filter.with_commit = with_commit;
188
189         for_each_tag_ref(show_reference, (void *) &filter);
190
191         return 0;
192 }
193
194 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
195                                 const unsigned char *sha1);
196
197 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
198 {
199         const char **p;
200         char ref[PATH_MAX];
201         int had_error = 0;
202         unsigned char sha1[20];
203
204         for (p = argv; *p; p++) {
205                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
206                                         >= sizeof(ref)) {
207                         error(_("tag name too long: %.*s..."), 50, *p);
208                         had_error = 1;
209                         continue;
210                 }
211                 if (read_ref(ref, sha1)) {
212                         error(_("tag '%s' not found."), *p);
213                         had_error = 1;
214                         continue;
215                 }
216                 if (fn(*p, ref, sha1))
217                         had_error = 1;
218         }
219         return had_error;
220 }
221
222 static int delete_tag(const char *name, const char *ref,
223                                 const unsigned char *sha1)
224 {
225         if (delete_ref(ref, sha1, 0))
226                 return 1;
227         printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
228         return 0;
229 }
230
231 static int verify_tag(const char *name, const char *ref,
232                                 const unsigned char *sha1)
233 {
234         const char *argv_verify_tag[] = {"verify-tag",
235                                         "-v", "SHA1_HEX", NULL};
236         argv_verify_tag[2] = sha1_to_hex(sha1);
237
238         if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
239                 return error(_("could not verify the tag '%s'"), name);
240         return 0;
241 }
242
243 static int do_sign(struct strbuf *buffer)
244 {
245         return sign_buffer(buffer, buffer, get_signing_key());
246 }
247
248 static const char tag_template[] =
249         N_("\nWrite a tag message\n"
250         "Lines starting with '%c' will be ignored.\n");
251
252 static const char tag_template_nocleanup[] =
253         N_("\nWrite a tag message\n"
254         "Lines starting with '%c' will be kept; you may remove them"
255         " yourself if you want to.\n");
256
257 static int git_tag_config(const char *var, const char *value, void *cb)
258 {
259         int status = git_gpg_config(var, value, cb);
260         if (status)
261                 return status;
262         if (!prefixcmp(var, "column."))
263                 return git_column_config(var, value, "tag", &colopts);
264         return git_default_config(var, value, cb);
265 }
266
267 static void write_tag_body(int fd, const unsigned char *sha1)
268 {
269         unsigned long size;
270         enum object_type type;
271         char *buf, *sp;
272
273         buf = read_sha1_file(sha1, &type, &size);
274         if (!buf)
275                 return;
276         /* skip header */
277         sp = strstr(buf, "\n\n");
278
279         if (!sp || !size || type != OBJ_TAG) {
280                 free(buf);
281                 return;
282         }
283         sp += 2; /* skip the 2 LFs */
284         write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
285
286         free(buf);
287 }
288
289 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
290 {
291         if (sign && do_sign(buf) < 0)
292                 return error(_("unable to sign the tag"));
293         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
294                 return error(_("unable to write tag file"));
295         return 0;
296 }
297
298 struct create_tag_options {
299         unsigned int message_given:1;
300         unsigned int sign;
301         enum {
302                 CLEANUP_NONE,
303                 CLEANUP_SPACE,
304                 CLEANUP_ALL
305         } cleanup_mode;
306 };
307
308 static void create_tag(const unsigned char *object, const char *tag,
309                        struct strbuf *buf, struct create_tag_options *opt,
310                        unsigned char *prev, unsigned char *result)
311 {
312         enum object_type type;
313         char header_buf[1024];
314         int header_len;
315         char *path = NULL;
316
317         type = sha1_object_info(object, NULL);
318         if (type <= OBJ_NONE)
319             die(_("bad object type."));
320
321         header_len = snprintf(header_buf, sizeof(header_buf),
322                           "object %s\n"
323                           "type %s\n"
324                           "tag %s\n"
325                           "tagger %s\n\n",
326                           sha1_to_hex(object),
327                           typename(type),
328                           tag,
329                           git_committer_info(IDENT_STRICT));
330
331         if (header_len > sizeof(header_buf) - 1)
332                 die(_("tag header too big."));
333
334         if (!opt->message_given) {
335                 int fd;
336
337                 /* write the template message before editing: */
338                 path = git_pathdup("TAG_EDITMSG");
339                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
340                 if (fd < 0)
341                         die_errno(_("could not create file '%s'"), path);
342
343                 if (!is_null_sha1(prev)) {
344                         write_tag_body(fd, prev);
345                 } else {
346                         struct strbuf buf = STRBUF_INIT;
347                         strbuf_addch(&buf, '\n');
348                         if (opt->cleanup_mode == CLEANUP_ALL)
349                                 strbuf_commented_addf(&buf, _(tag_template), comment_line_char);
350                         else
351                                 strbuf_commented_addf(&buf, _(tag_template_nocleanup), comment_line_char);
352                         write_or_die(fd, buf.buf, buf.len);
353                         strbuf_release(&buf);
354                 }
355                 close(fd);
356
357                 if (launch_editor(path, buf, NULL)) {
358                         fprintf(stderr,
359                         _("Please supply the message using either -m or -F option.\n"));
360                         exit(1);
361                 }
362         }
363
364         if (opt->cleanup_mode != CLEANUP_NONE)
365                 stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
366
367         if (!opt->message_given && !buf->len)
368                 die(_("no tag message?"));
369
370         strbuf_insert(buf, 0, header_buf, header_len);
371
372         if (build_tag_object(buf, opt->sign, result) < 0) {
373                 if (path)
374                         fprintf(stderr, _("The tag message has been left in %s\n"),
375                                 path);
376                 exit(128);
377         }
378         if (path) {
379                 unlink_or_warn(path);
380                 free(path);
381         }
382 }
383
384 struct msg_arg {
385         int given;
386         struct strbuf buf;
387 };
388
389 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
390 {
391         struct msg_arg *msg = opt->value;
392
393         if (!arg)
394                 return -1;
395         if (msg->buf.len)
396                 strbuf_addstr(&(msg->buf), "\n\n");
397         strbuf_addstr(&(msg->buf), arg);
398         msg->given = 1;
399         return 0;
400 }
401
402 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
403 {
404         if (name[0] == '-')
405                 return -1;
406
407         strbuf_reset(sb);
408         strbuf_addf(sb, "refs/tags/%s", name);
409
410         return check_refname_format(sb->buf, 0);
411 }
412
413 static int parse_opt_points_at(const struct option *opt __attribute__((unused)),
414                         const char *arg, int unset)
415 {
416         unsigned char sha1[20];
417
418         if (unset) {
419                 sha1_array_clear(&points_at);
420                 return 0;
421         }
422         if (!arg)
423                 return error(_("switch 'points-at' requires an object"));
424         if (get_sha1(arg, sha1))
425                 return error(_("malformed object name '%s'"), arg);
426         sha1_array_append(&points_at, sha1);
427         return 0;
428 }
429
430 int cmd_tag(int argc, const char **argv, const char *prefix)
431 {
432         struct strbuf buf = STRBUF_INIT;
433         struct strbuf ref = STRBUF_INIT;
434         unsigned char object[20], prev[20];
435         const char *object_ref, *tag;
436         struct ref_lock *lock;
437         struct create_tag_options opt;
438         char *cleanup_arg = NULL;
439         int annotate = 0, force = 0, lines = -1, list = 0,
440                 delete = 0, verify = 0;
441         const char *msgfile = NULL, *keyid = NULL;
442         struct msg_arg msg = { 0, STRBUF_INIT };
443         struct commit_list *with_commit = NULL;
444         struct option options[] = {
445                 OPT_BOOLEAN('l', "list", &list, N_("list tag names")),
446                 { OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
447                                 N_("print <n> lines of each tag message"),
448                                 PARSE_OPT_OPTARG, NULL, 1 },
449                 OPT_BOOLEAN('d', "delete", &delete, N_("delete tags")),
450                 OPT_BOOLEAN('v', "verify", &verify, N_("verify tags")),
451
452                 OPT_GROUP(N_("Tag creation options")),
453                 OPT_BOOLEAN('a', "annotate", &annotate,
454                                         N_("annotated tag, needs a message")),
455                 OPT_CALLBACK('m', "message", &msg, N_("message"),
456                              N_("tag message"), parse_msg_arg),
457                 OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
458                 OPT_BOOLEAN('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
459                 OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
460                         N_("how to strip spaces and #comments from message")),
461                 OPT_STRING('u', "local-user", &keyid, N_("key id"),
462                                         N_("use another key to sign the tag")),
463                 OPT__FORCE(&force, N_("replace the tag if exists")),
464                 OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
465
466                 OPT_GROUP(N_("Tag listing options")),
467                 {
468                         OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
469                         N_("print only tags that contain the commit"),
470                         PARSE_OPT_LASTARG_DEFAULT,
471                         parse_opt_with_commit, (intptr_t)"HEAD",
472                 },
473                 {
474                         OPTION_CALLBACK, 0, "points-at", NULL, N_("object"),
475                         N_("print only tags of the object"), 0, parse_opt_points_at
476                 },
477                 OPT_END()
478         };
479
480         git_config(git_tag_config, NULL);
481
482         memset(&opt, 0, sizeof(opt));
483
484         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
485
486         if (keyid) {
487                 opt.sign = 1;
488                 set_signing_key(keyid);
489         }
490         if (opt.sign)
491                 annotate = 1;
492         if (argc == 0 && !(delete || verify))
493                 list = 1;
494
495         if ((annotate || msg.given || msgfile || force) &&
496             (list || delete || verify))
497                 usage_with_options(git_tag_usage, options);
498
499         if (list + delete + verify > 1)
500                 usage_with_options(git_tag_usage, options);
501         finalize_colopts(&colopts, -1);
502         if (list && lines != -1) {
503                 if (explicitly_enable_column(colopts))
504                         die(_("--column and -n are incompatible"));
505                 colopts = 0;
506         }
507         if (list) {
508                 int ret;
509                 if (column_active(colopts)) {
510                         struct column_options copts;
511                         memset(&copts, 0, sizeof(copts));
512                         copts.padding = 2;
513                         run_column_filter(colopts, &copts);
514                 }
515                 ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit);
516                 if (column_active(colopts))
517                         stop_column_filter();
518                 return ret;
519         }
520         if (lines != -1)
521                 die(_("-n option is only allowed with -l."));
522         if (with_commit)
523                 die(_("--contains option is only allowed with -l."));
524         if (points_at.nr)
525                 die(_("--points-at option is only allowed with -l."));
526         if (delete)
527                 return for_each_tag_name(argv, delete_tag);
528         if (verify)
529                 return for_each_tag_name(argv, verify_tag);
530
531         if (msg.given || msgfile) {
532                 if (msg.given && msgfile)
533                         die(_("only one -F or -m option is allowed."));
534                 annotate = 1;
535                 if (msg.given)
536                         strbuf_addbuf(&buf, &(msg.buf));
537                 else {
538                         if (!strcmp(msgfile, "-")) {
539                                 if (strbuf_read(&buf, 0, 1024) < 0)
540                                         die_errno(_("cannot read '%s'"), msgfile);
541                         } else {
542                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
543                                         die_errno(_("could not open or read '%s'"),
544                                                 msgfile);
545                         }
546                 }
547         }
548
549         tag = argv[0];
550
551         object_ref = argc == 2 ? argv[1] : "HEAD";
552         if (argc > 2)
553                 die(_("too many params"));
554
555         if (get_sha1(object_ref, object))
556                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
557
558         if (strbuf_check_tag_ref(&ref, tag))
559                 die(_("'%s' is not a valid tag name."), tag);
560
561         if (read_ref(ref.buf, prev))
562                 hashclr(prev);
563         else if (!force)
564                 die(_("tag '%s' already exists"), tag);
565
566         opt.message_given = msg.given || msgfile;
567
568         if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
569                 opt.cleanup_mode = CLEANUP_ALL;
570         else if (!strcmp(cleanup_arg, "verbatim"))
571                 opt.cleanup_mode = CLEANUP_NONE;
572         else if (!strcmp(cleanup_arg, "whitespace"))
573                 opt.cleanup_mode = CLEANUP_SPACE;
574         else
575                 die(_("Invalid cleanup mode %s"), cleanup_arg);
576
577         if (annotate)
578                 create_tag(object, tag, &buf, &opt, prev, object);
579
580         lock = lock_any_ref_for_update(ref.buf, prev, 0);
581         if (!lock)
582                 die(_("%s: cannot lock the ref"), ref.buf);
583         if (write_ref_sha1(lock, object, NULL) < 0)
584                 die(_("%s: cannot update the ref"), ref.buf);
585         if (force && !is_null_sha1(prev) && hashcmp(prev, object))
586                 printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
587
588         strbuf_release(&buf);
589         strbuf_release(&ref);
590         return 0;
591 }