Merge branch 'ma/reduce-heads-leakfix'
[git/git.git] / builtin / fmt-merge-msg.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "config.h"
4 #include "refs.h"
5 #include "commit.h"
6 #include "diff.h"
7 #include "revision.h"
8 #include "tag.h"
9 #include "string-list.h"
10 #include "branch.h"
11 #include "fmt-merge-msg.h"
12 #include "gpg-interface.h"
13
14 static const char * const fmt_merge_msg_usage[] = {
15 N_("git fmt-merge-msg [-m <message>] [--log[=<n>] | --no-log] [--file <file>]"),
16 NULL
17 };
18
19 static int use_branch_desc;
20
21 int fmt_merge_msg_config(const char *key, const char *value, void *cb)
22 {
23 if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
24 int is_bool;
25 merge_log_config = git_config_bool_or_int(key, value, &is_bool);
26 if (!is_bool && merge_log_config < 0)
27 return error("%s: negative length %s", key, value);
28 if (is_bool && merge_log_config)
29 merge_log_config = DEFAULT_MERGE_LOG_LEN;
30 } else if (!strcmp(key, "merge.branchdesc")) {
31 use_branch_desc = git_config_bool(key, value);
32 } else {
33 return git_default_config(key, value, cb);
34 }
35 return 0;
36 }
37
38 /* merge data per repository where the merged tips came from */
39 struct src_data {
40 struct string_list branch, tag, r_branch, generic;
41 int head_status;
42 };
43
44 struct origin_data {
45 struct object_id oid;
46 unsigned is_local_branch:1;
47 };
48
49 static void init_src_data(struct src_data *data)
50 {
51 data->branch.strdup_strings = 1;
52 data->tag.strdup_strings = 1;
53 data->r_branch.strdup_strings = 1;
54 data->generic.strdup_strings = 1;
55 }
56
57 static struct string_list srcs = STRING_LIST_INIT_DUP;
58 static struct string_list origins = STRING_LIST_INIT_DUP;
59
60 struct merge_parents {
61 int alloc, nr;
62 struct merge_parent {
63 struct object_id given;
64 struct object_id commit;
65 unsigned char used;
66 } *item;
67 };
68
69 /*
70 * I know, I know, this is inefficient, but you won't be pulling and merging
71 * hundreds of heads at a time anyway.
72 */
73 static struct merge_parent *find_merge_parent(struct merge_parents *table,
74 struct object_id *given,
75 struct object_id *commit)
76 {
77 int i;
78 for (i = 0; i < table->nr; i++) {
79 if (given && oidcmp(&table->item[i].given, given))
80 continue;
81 if (commit && oidcmp(&table->item[i].commit, commit))
82 continue;
83 return &table->item[i];
84 }
85 return NULL;
86 }
87
88 static void add_merge_parent(struct merge_parents *table,
89 struct object_id *given,
90 struct object_id *commit)
91 {
92 if (table->nr && find_merge_parent(table, given, commit))
93 return;
94 ALLOC_GROW(table->item, table->nr + 1, table->alloc);
95 oidcpy(&table->item[table->nr].given, given);
96 oidcpy(&table->item[table->nr].commit, commit);
97 table->item[table->nr].used = 0;
98 table->nr++;
99 }
100
101 static int handle_line(char *line, struct merge_parents *merge_parents)
102 {
103 int i, len = strlen(line);
104 struct origin_data *origin_data;
105 char *src;
106 const char *origin;
107 struct src_data *src_data;
108 struct string_list_item *item;
109 int pulling_head = 0;
110 struct object_id oid;
111
112 if (len < GIT_SHA1_HEXSZ + 3 || line[GIT_SHA1_HEXSZ] != '\t')
113 return 1;
114
115 if (starts_with(line + GIT_SHA1_HEXSZ + 1, "not-for-merge"))
116 return 0;
117
118 if (line[GIT_SHA1_HEXSZ + 1] != '\t')
119 return 2;
120
121 i = get_oid_hex(line, &oid);
122 if (i)
123 return 3;
124
125 if (!find_merge_parent(merge_parents, &oid, NULL))
126 return 0; /* subsumed by other parents */
127
128 origin_data = xcalloc(1, sizeof(struct origin_data));
129 oidcpy(&origin_data->oid, &oid);
130
131 if (line[len - 1] == '\n')
132 line[len - 1] = 0;
133 line += GIT_SHA1_HEXSZ + 2;
134
135 /*
136 * At this point, line points at the beginning of comment e.g.
137 * "branch 'frotz' of git://that/repository.git".
138 * Find the repository name and point it with src.
139 */
140 src = strstr(line, " of ");
141 if (src) {
142 *src = 0;
143 src += 4;
144 pulling_head = 0;
145 } else {
146 src = line;
147 pulling_head = 1;
148 }
149
150 item = unsorted_string_list_lookup(&srcs, src);
151 if (!item) {
152 item = string_list_append(&srcs, src);
153 item->util = xcalloc(1, sizeof(struct src_data));
154 init_src_data(item->util);
155 }
156 src_data = item->util;
157
158 if (pulling_head) {
159 origin = src;
160 src_data->head_status |= 1;
161 } else if (starts_with(line, "branch ")) {
162 origin_data->is_local_branch = 1;
163 origin = line + 7;
164 string_list_append(&src_data->branch, origin);
165 src_data->head_status |= 2;
166 } else if (starts_with(line, "tag ")) {
167 origin = line;
168 string_list_append(&src_data->tag, origin + 4);
169 src_data->head_status |= 2;
170 } else if (skip_prefix(line, "remote-tracking branch ", &origin)) {
171 string_list_append(&src_data->r_branch, origin);
172 src_data->head_status |= 2;
173 } else {
174 origin = src;
175 string_list_append(&src_data->generic, line);
176 src_data->head_status |= 2;
177 }
178
179 if (!strcmp(".", src) || !strcmp(src, origin)) {
180 int len = strlen(origin);
181 if (origin[0] == '\'' && origin[len - 1] == '\'')
182 origin = xmemdupz(origin + 1, len - 2);
183 } else
184 origin = xstrfmt("%s of %s", origin, src);
185 if (strcmp(".", src))
186 origin_data->is_local_branch = 0;
187 string_list_append(&origins, origin)->util = origin_data;
188 return 0;
189 }
190
191 static void print_joined(const char *singular, const char *plural,
192 struct string_list *list, struct strbuf *out)
193 {
194 if (list->nr == 0)
195 return;
196 if (list->nr == 1) {
197 strbuf_addf(out, "%s%s", singular, list->items[0].string);
198 } else {
199 int i;
200 strbuf_addstr(out, plural);
201 for (i = 0; i < list->nr - 1; i++)
202 strbuf_addf(out, "%s%s", i > 0 ? ", " : "",
203 list->items[i].string);
204 strbuf_addf(out, " and %s", list->items[list->nr - 1].string);
205 }
206 }
207
208 static void add_branch_desc(struct strbuf *out, const char *name)
209 {
210 struct strbuf desc = STRBUF_INIT;
211
212 if (!read_branch_desc(&desc, name)) {
213 const char *bp = desc.buf;
214 while (*bp) {
215 const char *ep = strchrnul(bp, '\n');
216 if (*ep)
217 ep++;
218 strbuf_addf(out, " : %.*s", (int)(ep - bp), bp);
219 bp = ep;
220 }
221 strbuf_complete_line(out);
222 }
223 strbuf_release(&desc);
224 }
225
226 #define util_as_integral(elem) ((intptr_t)((elem)->util))
227
228 static void record_person_from_buf(int which, struct string_list *people,
229 const char *buffer)
230 {
231 char *name_buf, *name, *name_end;
232 struct string_list_item *elem;
233 const char *field;
234
235 field = (which == 'a') ? "\nauthor " : "\ncommitter ";
236 name = strstr(buffer, field);
237 if (!name)
238 return;
239 name += strlen(field);
240 name_end = strchrnul(name, '<');
241 if (*name_end)
242 name_end--;
243 while (isspace(*name_end) && name <= name_end)
244 name_end--;
245 if (name_end < name)
246 return;
247 name_buf = xmemdupz(name, name_end - name + 1);
248
249 elem = string_list_lookup(people, name_buf);
250 if (!elem) {
251 elem = string_list_insert(people, name_buf);
252 elem->util = (void *)0;
253 }
254 elem->util = (void*)(util_as_integral(elem) + 1);
255 free(name_buf);
256 }
257
258
259 static void record_person(int which, struct string_list *people,
260 struct commit *commit)
261 {
262 const char *buffer = get_commit_buffer(commit, NULL);
263 record_person_from_buf(which, people, buffer);
264 unuse_commit_buffer(commit, buffer);
265 }
266
267 static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
268 {
269 const struct string_list_item *a = a_, *b = b_;
270 return util_as_integral(b) - util_as_integral(a);
271 }
272
273 static void add_people_count(struct strbuf *out, struct string_list *people)
274 {
275 if (people->nr == 1)
276 strbuf_addstr(out, people->items[0].string);
277 else if (people->nr == 2)
278 strbuf_addf(out, "%s (%d) and %s (%d)",
279 people->items[0].string,
280 (int)util_as_integral(&people->items[0]),
281 people->items[1].string,
282 (int)util_as_integral(&people->items[1]));
283 else if (people->nr)
284 strbuf_addf(out, "%s (%d) and others",
285 people->items[0].string,
286 (int)util_as_integral(&people->items[0]));
287 }
288
289 static void credit_people(struct strbuf *out,
290 struct string_list *them,
291 int kind)
292 {
293 const char *label;
294 const char *me;
295
296 if (kind == 'a') {
297 label = "By";
298 me = git_author_info(IDENT_NO_DATE);
299 } else {
300 label = "Via";
301 me = git_committer_info(IDENT_NO_DATE);
302 }
303
304 if (!them->nr ||
305 (them->nr == 1 &&
306 me &&
307 skip_prefix(me, them->items->string, &me) &&
308 starts_with(me, " <")))
309 return;
310 strbuf_addf(out, "\n%c %s ", comment_line_char, label);
311 add_people_count(out, them);
312 }
313
314 static void add_people_info(struct strbuf *out,
315 struct string_list *authors,
316 struct string_list *committers)
317 {
318 QSORT(authors->items, authors->nr,
319 cmp_string_list_util_as_integral);
320 QSORT(committers->items, committers->nr,
321 cmp_string_list_util_as_integral);
322
323 credit_people(out, authors, 'a');
324 credit_people(out, committers, 'c');
325 }
326
327 static void shortlog(const char *name,
328 struct origin_data *origin_data,
329 struct commit *head,
330 struct rev_info *rev,
331 struct fmt_merge_msg_opts *opts,
332 struct strbuf *out)
333 {
334 int i, count = 0;
335 struct commit *commit;
336 struct object *branch;
337 struct string_list subjects = STRING_LIST_INIT_DUP;
338 struct string_list authors = STRING_LIST_INIT_DUP;
339 struct string_list committers = STRING_LIST_INIT_DUP;
340 int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
341 struct strbuf sb = STRBUF_INIT;
342 const struct object_id *oid = &origin_data->oid;
343 int limit = opts->shortlog_len;
344
345 branch = deref_tag(parse_object(oid), oid_to_hex(oid), GIT_SHA1_HEXSZ);
346 if (!branch || branch->type != OBJ_COMMIT)
347 return;
348
349 setup_revisions(0, NULL, rev, NULL);
350 add_pending_object(rev, branch, name);
351 add_pending_object(rev, &head->object, "^HEAD");
352 head->object.flags |= UNINTERESTING;
353 if (prepare_revision_walk(rev))
354 die("revision walk setup failed");
355 while ((commit = get_revision(rev)) != NULL) {
356 struct pretty_print_context ctx = {0};
357
358 if (commit->parents && commit->parents->next) {
359 /* do not list a merge but count committer */
360 if (opts->credit_people)
361 record_person('c', &committers, commit);
362 continue;
363 }
364 if (!count && opts->credit_people)
365 /* the 'tip' committer */
366 record_person('c', &committers, commit);
367 if (opts->credit_people)
368 record_person('a', &authors, commit);
369 count++;
370 if (subjects.nr > limit)
371 continue;
372
373 format_commit_message(commit, "%s", &sb, &ctx);
374 strbuf_ltrim(&sb);
375
376 if (!sb.len)
377 string_list_append(&subjects,
378 oid_to_hex(&commit->object.oid));
379 else
380 string_list_append(&subjects, strbuf_detach(&sb, NULL));
381 }
382
383 if (opts->credit_people)
384 add_people_info(out, &authors, &committers);
385 if (count > limit)
386 strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
387 else
388 strbuf_addf(out, "\n* %s:\n", name);
389
390 if (origin_data->is_local_branch && use_branch_desc)
391 add_branch_desc(out, name);
392
393 for (i = 0; i < subjects.nr; i++)
394 if (i >= limit)
395 strbuf_addstr(out, " ...\n");
396 else
397 strbuf_addf(out, " %s\n", subjects.items[i].string);
398
399 clear_commit_marks((struct commit *)branch, flags);
400 clear_commit_marks(head, flags);
401 free_commit_list(rev->commits);
402 rev->commits = NULL;
403 rev->pending.nr = 0;
404
405 string_list_clear(&authors, 0);
406 string_list_clear(&committers, 0);
407 string_list_clear(&subjects, 0);
408 }
409
410 static void fmt_merge_msg_title(struct strbuf *out,
411 const char *current_branch)
412 {
413 int i = 0;
414 char *sep = "";
415
416 strbuf_addstr(out, "Merge ");
417 for (i = 0; i < srcs.nr; i++) {
418 struct src_data *src_data = srcs.items[i].util;
419 const char *subsep = "";
420
421 strbuf_addstr(out, sep);
422 sep = "; ";
423
424 if (src_data->head_status == 1) {
425 strbuf_addstr(out, srcs.items[i].string);
426 continue;
427 }
428 if (src_data->head_status == 3) {
429 subsep = ", ";
430 strbuf_addstr(out, "HEAD");
431 }
432 if (src_data->branch.nr) {
433 strbuf_addstr(out, subsep);
434 subsep = ", ";
435 print_joined("branch ", "branches ", &src_data->branch,
436 out);
437 }
438 if (src_data->r_branch.nr) {
439 strbuf_addstr(out, subsep);
440 subsep = ", ";
441 print_joined("remote-tracking branch ", "remote-tracking branches ",
442 &src_data->r_branch, out);
443 }
444 if (src_data->tag.nr) {
445 strbuf_addstr(out, subsep);
446 subsep = ", ";
447 print_joined("tag ", "tags ", &src_data->tag, out);
448 }
449 if (src_data->generic.nr) {
450 strbuf_addstr(out, subsep);
451 print_joined("commit ", "commits ", &src_data->generic,
452 out);
453 }
454 if (strcmp(".", srcs.items[i].string))
455 strbuf_addf(out, " of %s", srcs.items[i].string);
456 }
457
458 if (!strcmp("master", current_branch))
459 strbuf_addch(out, '\n');
460 else
461 strbuf_addf(out, " into %s\n", current_branch);
462 }
463
464 static void fmt_tag_signature(struct strbuf *tagbuf,
465 struct strbuf *sig,
466 const char *buf,
467 unsigned long len)
468 {
469 const char *tag_body = strstr(buf, "\n\n");
470 if (tag_body) {
471 tag_body += 2;
472 strbuf_add(tagbuf, tag_body, buf + len - tag_body);
473 }
474 strbuf_complete_line(tagbuf);
475 if (sig->len) {
476 strbuf_addch(tagbuf, '\n');
477 strbuf_add_commented_lines(tagbuf, sig->buf, sig->len);
478 }
479 }
480
481 static void fmt_merge_msg_sigs(struct strbuf *out)
482 {
483 int i, tag_number = 0, first_tag = 0;
484 struct strbuf tagbuf = STRBUF_INIT;
485
486 for (i = 0; i < origins.nr; i++) {
487 unsigned char *sha1 = origins.items[i].util;
488 enum object_type type;
489 unsigned long size, len;
490 char *buf = read_sha1_file(sha1, &type, &size);
491 struct strbuf sig = STRBUF_INIT;
492
493 if (!buf || type != OBJ_TAG)
494 goto next;
495 len = parse_signature(buf, size);
496
497 if (size == len)
498 ; /* merely annotated */
499 else if (verify_signed_buffer(buf, len, buf + len, size - len, &sig, NULL)) {
500 if (!sig.len)
501 strbuf_addstr(&sig, "gpg verification failed.\n");
502 }
503
504 if (!tag_number++) {
505 fmt_tag_signature(&tagbuf, &sig, buf, len);
506 first_tag = i;
507 } else {
508 if (tag_number == 2) {
509 struct strbuf tagline = STRBUF_INIT;
510 strbuf_addch(&tagline, '\n');
511 strbuf_add_commented_lines(&tagline,
512 origins.items[first_tag].string,
513 strlen(origins.items[first_tag].string));
514 strbuf_insert(&tagbuf, 0, tagline.buf,
515 tagline.len);
516 strbuf_release(&tagline);
517 }
518 strbuf_addch(&tagbuf, '\n');
519 strbuf_add_commented_lines(&tagbuf,
520 origins.items[i].string,
521 strlen(origins.items[i].string));
522 fmt_tag_signature(&tagbuf, &sig, buf, len);
523 }
524 strbuf_release(&sig);
525 next:
526 free(buf);
527 }
528 if (tagbuf.len) {
529 strbuf_addch(out, '\n');
530 strbuf_addbuf(out, &tagbuf);
531 }
532 strbuf_release(&tagbuf);
533 }
534
535 static void find_merge_parents(struct merge_parents *result,
536 struct strbuf *in, struct object_id *head)
537 {
538 struct commit_list *parents;
539 struct commit *head_commit;
540 int pos = 0, i, j;
541
542 parents = NULL;
543 while (pos < in->len) {
544 int len;
545 char *p = in->buf + pos;
546 char *newline = strchr(p, '\n');
547 struct object_id oid;
548 struct commit *parent;
549 struct object *obj;
550
551 len = newline ? newline - p : strlen(p);
552 pos += len + !!newline;
553
554 if (len < GIT_SHA1_HEXSZ + 3 ||
555 get_oid_hex(p, &oid) ||
556 p[GIT_SHA1_HEXSZ] != '\t' ||
557 p[GIT_SHA1_HEXSZ + 1] != '\t')
558 continue; /* skip not-for-merge */
559 /*
560 * Do not use get_merge_parent() here; we do not have
561 * "name" here and we do not want to contaminate its
562 * util field yet.
563 */
564 obj = parse_object(&oid);
565 parent = (struct commit *)peel_to_type(NULL, 0, obj, OBJ_COMMIT);
566 if (!parent)
567 continue;
568 commit_list_insert(parent, &parents);
569 add_merge_parent(result, &obj->oid, &parent->object.oid);
570 }
571 head_commit = lookup_commit(head);
572 if (head_commit)
573 commit_list_insert(head_commit, &parents);
574 reduce_heads_replace(&parents);
575
576 while (parents) {
577 struct commit *cmit = pop_commit(&parents);
578 for (i = 0; i < result->nr; i++)
579 if (!oidcmp(&result->item[i].commit, &cmit->object.oid))
580 result->item[i].used = 1;
581 }
582
583 for (i = j = 0; i < result->nr; i++) {
584 if (result->item[i].used) {
585 if (i != j)
586 result->item[j] = result->item[i];
587 j++;
588 }
589 }
590 result->nr = j;
591 }
592
593 int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
594 struct fmt_merge_msg_opts *opts)
595 {
596 int i = 0, pos = 0;
597 struct object_id head_oid;
598 const char *current_branch;
599 void *current_branch_to_free;
600 struct merge_parents merge_parents;
601
602 memset(&merge_parents, 0, sizeof(merge_parents));
603
604 /* get current branch */
605 current_branch = current_branch_to_free =
606 resolve_refdup("HEAD", RESOLVE_REF_READING, &head_oid, NULL);
607 if (!current_branch)
608 die("No current branch");
609 if (starts_with(current_branch, "refs/heads/"))
610 current_branch += 11;
611
612 find_merge_parents(&merge_parents, in, &head_oid);
613
614 /* get a line */
615 while (pos < in->len) {
616 int len;
617 char *newline, *p = in->buf + pos;
618
619 newline = strchr(p, '\n');
620 len = newline ? newline - p : strlen(p);
621 pos += len + !!newline;
622 i++;
623 p[len] = 0;
624 if (handle_line(p, &merge_parents))
625 die ("Error in line %d: %.*s", i, len, p);
626 }
627
628 if (opts->add_title && srcs.nr)
629 fmt_merge_msg_title(out, current_branch);
630
631 if (origins.nr)
632 fmt_merge_msg_sigs(out);
633
634 if (opts->shortlog_len) {
635 struct commit *head;
636 struct rev_info rev;
637
638 head = lookup_commit_or_die(&head_oid, "HEAD");
639 init_revisions(&rev, NULL);
640 rev.commit_format = CMIT_FMT_ONELINE;
641 rev.ignore_merges = 1;
642 rev.limited = 1;
643
644 strbuf_complete_line(out);
645
646 for (i = 0; i < origins.nr; i++)
647 shortlog(origins.items[i].string,
648 origins.items[i].util,
649 head, &rev, opts, out);
650 }
651
652 strbuf_complete_line(out);
653 free(current_branch_to_free);
654 free(merge_parents.item);
655 return 0;
656 }
657
658 int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
659 {
660 const char *inpath = NULL;
661 const char *message = NULL;
662 int shortlog_len = -1;
663 struct option options[] = {
664 { OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
665 N_("populate log with at most <n> entries from shortlog"),
666 PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
667 { OPTION_INTEGER, 0, "summary", &shortlog_len, N_("n"),
668 N_("alias for --log (deprecated)"),
669 PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, NULL,
670 DEFAULT_MERGE_LOG_LEN },
671 OPT_STRING('m', "message", &message, N_("text"),
672 N_("use <text> as start of message")),
673 OPT_FILENAME('F', "file", &inpath, N_("file to read from")),
674 OPT_END()
675 };
676
677 FILE *in = stdin;
678 struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
679 int ret;
680 struct fmt_merge_msg_opts opts;
681
682 git_config(fmt_merge_msg_config, NULL);
683 argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
684 0);
685 if (argc > 0)
686 usage_with_options(fmt_merge_msg_usage, options);
687 if (shortlog_len < 0)
688 shortlog_len = (merge_log_config > 0) ? merge_log_config : 0;
689
690 if (inpath && strcmp(inpath, "-")) {
691 in = fopen(inpath, "r");
692 if (!in)
693 die_errno("cannot open '%s'", inpath);
694 }
695
696 if (strbuf_read(&input, fileno(in), 0) < 0)
697 die_errno("could not read input file");
698
699 if (message)
700 strbuf_addstr(&output, message);
701
702 memset(&opts, 0, sizeof(opts));
703 opts.add_title = !message;
704 opts.credit_people = 1;
705 opts.shortlog_len = shortlog_len;
706
707 ret = fmt_merge_msg(&input, &output, &opts);
708 if (ret)
709 return ret;
710 write_in_full(STDOUT_FILENO, output.buf, output.len);
711 return 0;
712 }