Git 2.19.1
[git/git.git] / commit.c
CommitLineData
8f1d2e6f 1#include "cache.h"
961784ee 2#include "tag.h"
175785e5 3#include "commit.h"
177722b3 4#include "commit-graph.h"
6a1a79fd 5#include "repository.h"
cbd53a21 6#include "object-store.h"
ed09aef0 7#include "pkt-line.h"
52883fbd 8#include "utf8.h"
199c45bf
JH
9#include "diff.h"
10#include "revision.h"
a97a7468 11#include "notes.h"
14ba97f8 12#include "alloc.h"
ba3c69a9 13#include "gpg-interface.h"
46905893 14#include "mergesort.h"
a84b794a 15#include "commit-slab.h"
da24b104 16#include "prio-queue.h"
0a9136f3 17#include "sha1-lookup.h"
d76650b8 18#include "wt-status.h"
f9f99b3f 19#include "advice.h"
175785e5 20
82a75299
JH
21static struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len, const char **);
22
60ab26de
LT
23int save_commit_buffer = 1;
24
175785e5
DB
25const char *commit_type = "commit";
26
d9a05e74 27struct commit *lookup_commit_reference_gently(struct repository *r,
21e1ee8f 28 const struct object_id *oid, int quiet)
961784ee 29{
d9a05e74
SB
30 struct object *obj = deref_tag(r,
31 parse_object(r, oid),
109cd76d 32 NULL, 0);
961784ee
LT
33
34 if (!obj)
35 return NULL;
d9a05e74 36 return object_as_type(r, obj, OBJ_COMMIT, quiet);
f76412ed
JH
37}
38
1f6c72fe 39struct commit *lookup_commit_reference(struct repository *r, const struct object_id *oid)
f76412ed 40{
1f6c72fe 41 return lookup_commit_reference_gently(r, oid, 0);
961784ee
LT
42}
43
bc83266a 44struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref_name)
baf18fc2 45{
2122f675 46 struct commit *c = lookup_commit_reference(the_repository, oid);
baf18fc2
NTND
47 if (!c)
48 die(_("could not parse %s"), ref_name);
bc83266a 49 if (oidcmp(oid, &c->object.oid)) {
baf18fc2 50 warning(_("%s %s is not a commit!"),
bc83266a 51 ref_name, oid_to_hex(oid));
baf18fc2
NTND
52 }
53 return c;
54}
55
bacf1687 56struct commit *lookup_commit(struct repository *r, const struct object_id *oid)
175785e5 57{
bacf1687 58 struct object *obj = lookup_object(r, oid->hash);
d36f51c1 59 if (!obj)
bacf1687
SB
60 return create_object(r, oid->hash,
61 alloc_commit_node(r));
62 return object_as_type(r, obj, OBJ_COMMIT, 0);
175785e5
DB
63}
64
a6fa5992
PN
65struct commit *lookup_commit_reference_by_name(const char *name)
66{
7683e2e6 67 struct object_id oid;
a6fa5992
PN
68 struct commit *commit;
69
e82caf38 70 if (get_oid_committish(name, &oid))
a6fa5992 71 return NULL;
2122f675 72 commit = lookup_commit_reference(the_repository, &oid);
5e7d4d3e 73 if (parse_commit(commit))
a6fa5992
PN
74 return NULL;
75 return commit;
76}
77
dddbad72 78static timestamp_t parse_commit_date(const char *buf, const char *tail)
175785e5 79{
0a617799 80 const char *dateptr;
175785e5 81
0a617799
MK
82 if (buf + 6 >= tail)
83 return 0;
175785e5
DB
84 if (memcmp(buf, "author", 6))
85 return 0;
0a617799 86 while (buf < tail && *buf++ != '\n')
175785e5 87 /* nada */;
0a617799
MK
88 if (buf + 9 >= tail)
89 return 0;
175785e5
DB
90 if (memcmp(buf, "committer", 9))
91 return 0;
0a617799 92 while (buf < tail && *buf++ != '>')
175785e5 93 /* nada */;
0a617799
MK
94 if (buf >= tail)
95 return 0;
96 dateptr = buf;
97 while (buf < tail && *buf++ != '\n')
98 /* nada */;
99 if (buf >= tail)
100 return 0;
1aeb7e75
JS
101 /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
102 return parse_timestamp(dateptr, NULL, 10);
175785e5
DB
103}
104
0a9136f3
DD
105static const unsigned char *commit_graft_sha1_access(size_t index, void *table)
106{
107 struct commit_graft **commit_graft_table = table;
7683e2e6 108 return commit_graft_table[index]->oid.hash;
0a9136f3
DD
109}
110
e808656c 111static int commit_graft_pos(struct repository *r, const unsigned char *sha1)
5da5c8f4 112{
e808656c
BW
113 return sha1_pos(sha1, r->parsed_objects->grafts,
114 r->parsed_objects->grafts_nr,
0a9136f3 115 commit_graft_sha1_access);
5da5c8f4
JH
116}
117
a3b78e83
BW
118int register_commit_graft(struct repository *r, struct commit_graft *graft,
119 int ignore_dups)
5040f17e 120{
a3b78e83 121 int pos = commit_graft_pos(r, graft->oid.hash);
a6080a0a 122
5040f17e
JH
123 if (0 <= pos) {
124 if (ignore_dups)
125 free(graft);
126 else {
a3b78e83
BW
127 free(r->parsed_objects->grafts[pos]);
128 r->parsed_objects->grafts[pos] = graft;
5040f17e
JH
129 }
130 return 1;
131 }
132 pos = -pos - 1;
a3b78e83
BW
133 ALLOC_GROW(r->parsed_objects->grafts,
134 r->parsed_objects->grafts_nr + 1,
135 r->parsed_objects->grafts_alloc);
136 r->parsed_objects->grafts_nr++;
137 if (pos < r->parsed_objects->grafts_nr)
138 memmove(r->parsed_objects->grafts + pos + 1,
139 r->parsed_objects->grafts + pos,
140 (r->parsed_objects->grafts_nr - pos - 1) *
141 sizeof(*r->parsed_objects->grafts));
142 r->parsed_objects->grafts[pos] = graft;
5040f17e
JH
143 return 0;
144}
145
9a934032 146struct commit_graft *read_graft_line(struct strbuf *line)
5040f17e
JH
147{
148 /* The format is just "Commit Parent1 Parent2 ...\n" */
cfa5bf16
PO
149 int i, phase;
150 const char *tail = NULL;
5040f17e 151 struct commit_graft *graft = NULL;
cfa5bf16 152 struct object_id dummy_oid, *oid;
5040f17e 153
9a934032
PO
154 strbuf_rtrim(line);
155 if (!line->len || line->buf[0] == '#')
5bc4ce58 156 return NULL;
cfa5bf16
PO
157 /*
158 * phase 0 verifies line, counts hashes in line and allocates graft
159 * phase 1 fills graft
160 */
161 for (phase = 0; phase < 2; phase++) {
162 oid = graft ? &graft->oid : &dummy_oid;
163 if (parse_oid_hex(line->buf, oid, &tail))
5040f17e 164 goto bad_graft_data;
cfa5bf16
PO
165 for (i = 0; *tail != '\0'; i++) {
166 oid = graft ? &graft->parent[i] : &dummy_oid;
167 if (!isspace(*tail++) || parse_oid_hex(tail, oid, &tail))
168 goto bad_graft_data;
169 }
170 if (!graft) {
171 graft = xmalloc(st_add(sizeof(*graft),
172 st_mult(sizeof(struct object_id), i)));
173 graft->nr_parent = i;
174 }
5040f17e
JH
175 }
176 return graft;
df5d43be
RT
177
178bad_graft_data:
9a934032 179 error("bad graft data: %s", line->buf);
cfa5bf16 180 assert(!graft);
df5d43be 181 return NULL;
5040f17e
JH
182}
183
d0e5dd0e 184static int read_graft_file(struct repository *r, const char *graft_file)
5da5c8f4 185{
e9d983f1 186 FILE *fp = fopen_or_warn(graft_file, "r");
e228c173 187 struct strbuf buf = STRBUF_INIT;
5040f17e
JH
188 if (!fp)
189 return -1;
f9f99b3f
JS
190 if (advice_graft_file_deprecated)
191 advise(_("Support for <GIT_DIR>/info/grafts is deprecated\n"
192 "and will be removed in a future Git version.\n"
193 "\n"
194 "Please use \"git replace --convert-graft-file\"\n"
195 "to convert the grafts into replace refs.\n"
196 "\n"
197 "Turn this message off by running\n"
198 "\"git config advice.graftFileDeprecated false\""));
e228c173 199 while (!strbuf_getwholeline(&buf, fp, '\n')) {
5da5c8f4 200 /* The format is just "Commit Parent1 Parent2 ...\n" */
9a934032 201 struct commit_graft *graft = read_graft_line(&buf);
5bc4ce58
JH
202 if (!graft)
203 continue;
d0e5dd0e 204 if (register_commit_graft(r, graft, 1))
e228c173 205 error("duplicate graft data: %s", buf.buf);
5da5c8f4
JH
206 }
207 fclose(fp);
e228c173 208 strbuf_release(&buf);
5040f17e
JH
209 return 0;
210}
211
2f6c767f 212static void prepare_commit_graft(struct repository *r)
5040f17e 213{
5040f17e
JH
214 char *graft_file;
215
2f6c767f 216 if (r->parsed_objects->commit_graft_prepared)
5040f17e 217 return;
14a9bd28
JK
218 if (!startup_info->have_repository)
219 return;
220
2f6c767f
SB
221 graft_file = get_graft_file(r);
222 read_graft_file(r, graft_file);
ed09aef0 223 /* make sure shallows are read */
2f6c767f
SB
224 is_repository_shallow(r);
225 r->parsed_objects->commit_graft_prepared = 1;
5da5c8f4
JH
226}
227
b9dbddf6 228struct commit_graft *lookup_commit_graft(struct repository *r, const struct object_id *oid)
5da5c8f4
JH
229{
230 int pos;
b9dbddf6
SB
231 prepare_commit_graft(r);
232 pos = commit_graft_pos(r, oid->hash);
5da5c8f4
JH
233 if (pos < 0)
234 return NULL;
b9dbddf6 235 return r->parsed_objects->grafts[pos];
5da5c8f4
JH
236}
237
09d46644 238int for_each_commit_graft(each_commit_graft_fn fn, void *cb_data)
ed09aef0 239{
09d46644 240 int i, ret;
6a1a79fd
JN
241 for (i = ret = 0; i < the_repository->parsed_objects->grafts_nr && !ret; i++)
242 ret = fn(the_repository->parsed_objects->grafts[i], cb_data);
09d46644 243 return ret;
ed09aef0
JS
244}
245
e92b848c 246int unregister_shallow(const struct object_id *oid)
f53514bc 247{
be479e80 248 int pos = commit_graft_pos(the_repository, oid->hash);
f53514bc
JS
249 if (pos < 0)
250 return -1;
6a1a79fd
JN
251 if (pos + 1 < the_repository->parsed_objects->grafts_nr)
252 MOVE_ARRAY(the_repository->parsed_objects->grafts + pos,
253 the_repository->parsed_objects->grafts + pos + 1,
254 the_repository->parsed_objects->grafts_nr - pos - 1);
255 the_repository->parsed_objects->grafts_nr--;
f53514bc
JS
256 return 0;
257}
258
8597ea3a
JK
259struct commit_buffer {
260 void *buffer;
261 unsigned long size;
262};
263define_commit_slab(buffer_slab, struct commit_buffer);
c1b3c71f 264
65ea9d4b 265struct buffer_slab *allocate_commit_buffer_slab(void)
66c2827e 266{
65ea9d4b
SB
267 struct buffer_slab *bs = xmalloc(sizeof(*bs));
268 init_buffer_slab(bs);
269 return bs;
270}
271
272void free_commit_buffer_slab(struct buffer_slab *bs)
273{
274 clear_buffer_slab(bs);
275 free(bs);
276}
c1b3c71f 277
1a40fc45 278void set_commit_buffer(struct repository *r, struct commit *commit, void *buffer, unsigned long size)
66c2827e 279{
65ea9d4b 280 struct commit_buffer *v = buffer_slab_at(
1a40fc45 281 r->parsed_objects->buffer_slab, commit);
8597ea3a
JK
282 v->buffer = buffer;
283 v->size = size;
66c2827e
JK
284}
285
4ff7e5c9 286const void *get_cached_commit_buffer(struct repository *r, const struct commit *commit, unsigned long *sizep)
152ff1cc 287{
65ea9d4b 288 struct commit_buffer *v = buffer_slab_peek(
4ff7e5c9 289 r->parsed_objects->buffer_slab, commit);
862e730e
JH
290 if (!v) {
291 if (sizep)
292 *sizep = 0;
293 return NULL;
294 }
8597ea3a
JK
295 if (sizep)
296 *sizep = v->size;
297 return v->buffer;
152ff1cc
JK
298}
299
8597ea3a 300const void *get_commit_buffer(const struct commit *commit, unsigned long *sizep)
152ff1cc 301{
3ce85f7e 302 const void *ret = get_cached_commit_buffer(the_repository, commit, sizep);
152ff1cc
JK
303 if (!ret) {
304 enum object_type type;
305 unsigned long size;
b4f5aca4 306 ret = read_object_file(&commit->object.oid, &type, &size);
152ff1cc
JK
307 if (!ret)
308 die("cannot read commit object %s",
f2fd0760 309 oid_to_hex(&commit->object.oid));
152ff1cc
JK
310 if (type != OBJ_COMMIT)
311 die("expected commit for %s, got %s",
debca9d2 312 oid_to_hex(&commit->object.oid), type_name(type));
8597ea3a
JK
313 if (sizep)
314 *sizep = size;
152ff1cc
JK
315 }
316 return ret;
317}
318
319void unuse_commit_buffer(const struct commit *commit, const void *buffer)
320{
65ea9d4b
SB
321 struct commit_buffer *v = buffer_slab_peek(
322 the_repository->parsed_objects->buffer_slab, commit);
862e730e 323 if (!(v && v->buffer == buffer))
152ff1cc
JK
324 free((void *)buffer);
325}
326
0fb370da
JK
327void free_commit_buffer(struct commit *commit)
328{
65ea9d4b
SB
329 struct commit_buffer *v = buffer_slab_peek(
330 the_repository->parsed_objects->buffer_slab, commit);
862e730e 331 if (v) {
6a83d902 332 FREE_AND_NULL(v->buffer);
862e730e
JH
333 v->size = 0;
334 }
0fb370da
JK
335}
336
5bb03de1
DS
337struct tree *get_commit_tree(const struct commit *commit)
338{
7b8a21db
DS
339 if (commit->maybe_tree || !commit->object.parsed)
340 return commit->maybe_tree;
341
342 if (commit->graph_pos == COMMIT_NOT_FROM_GRAPH)
343 BUG("commit has NULL tree, but was not loaded from commit-graph");
344
dade47c0 345 return get_commit_tree_in_graph(the_repository, commit);
5bb03de1
DS
346}
347
348struct object_id *get_commit_tree_oid(const struct commit *commit)
349{
350 return &get_commit_tree(commit)->object.oid;
351}
352
14ba97f8
SB
353void release_commit_memory(struct commit *c)
354{
11024058 355 c->maybe_tree = NULL;
14ba97f8
SB
356 c->index = 0;
357 free_commit_buffer(c);
358 free_commit_list(c->parents);
359 /* TODO: what about commit->util? */
360
361 c->object.parsed = 0;
362}
363
8597ea3a 364const void *detach_commit_buffer(struct commit *commit, unsigned long *sizep)
0fb370da 365{
65ea9d4b
SB
366 struct commit_buffer *v = buffer_slab_peek(
367 the_repository->parsed_objects->buffer_slab, commit);
8597ea3a
JK
368 void *ret;
369
862e730e
JH
370 if (!v) {
371 if (sizep)
372 *sizep = 0;
373 return NULL;
374 }
8597ea3a
JK
375 ret = v->buffer;
376 if (sizep)
377 *sizep = v->size;
378
379 v->buffer = NULL;
380 v->size = 0;
0fb370da
JK
381 return ret;
382}
383
fd8030c7 384int parse_commit_buffer(struct repository *r, struct commit *item, const void *buffer, unsigned long size, int check_graph)
175785e5 385{
cf7b1cad
NTND
386 const char *tail = buffer;
387 const char *bufptr = buffer;
7683e2e6 388 struct object_id parent;
6c88be16 389 struct commit_list **pptr;
5da5c8f4 390 struct commit_graft *graft;
2770ccbd 391 const int tree_entry_len = the_hash_algo->hexsz + 5;
392 const int parent_entry_len = the_hash_algo->hexsz + 7;
bd2c39f5 393
175785e5
DB
394 if (item->object.parsed)
395 return 0;
396 item->object.parsed = 1;
3b44f15a 397 tail += size;
7683e2e6 398 if (tail <= bufptr + tree_entry_len + 1 || memcmp(bufptr, "tree ", 5) ||
399 bufptr[tree_entry_len] != '\n')
f2fd0760 400 return error("bogus commit object %s", oid_to_hex(&item->object.oid));
26ea3e7d 401 if (get_oid_hex(bufptr + 5, &parent) < 0)
bd2afde8 402 return error("bad tree pointer in commit %s",
f2fd0760 403 oid_to_hex(&item->object.oid));
fd8030c7 404 item->maybe_tree = lookup_tree(r, &parent);
7683e2e6 405 bufptr += tree_entry_len + 1; /* "tree " + "hex sha1" + "\n" */
6c88be16 406 pptr = &item->parents;
5da5c8f4 407
fd8030c7 408 graft = lookup_commit_graft(r, &item->object.oid);
7683e2e6 409 while (bufptr + parent_entry_len < tail && !memcmp(bufptr, "parent ", 7)) {
f7cc77d7
LT
410 struct commit *new_parent;
411
7683e2e6 412 if (tail <= bufptr + parent_entry_len + 1 ||
26ea3e7d 413 get_oid_hex(bufptr + 7, &parent) ||
7683e2e6 414 bufptr[parent_entry_len] != '\n')
f2fd0760 415 return error("bad parents in commit %s", oid_to_hex(&item->object.oid));
7683e2e6 416 bufptr += parent_entry_len + 1;
7f3140cd
JS
417 /*
418 * The clone is shallow if nr_parent < 0, and we must
419 * not traverse its real parents even when we unhide them.
420 */
421 if (graft && (graft->nr_parent < 0 || grafts_replace_parents))
5da5c8f4 422 continue;
fd8030c7 423 new_parent = lookup_commit(r, &parent);
39468def 424 if (new_parent)
6c88be16 425 pptr = &commit_list_insert(new_parent, pptr)->next;
5da5c8f4
JH
426 }
427 if (graft) {
428 int i;
429 struct commit *new_parent;
430 for (i = 0; i < graft->nr_parent; i++) {
fd8030c7 431 new_parent = lookup_commit(r,
c1f5eb49 432 &graft->parent[i]);
5da5c8f4
JH
433 if (!new_parent)
434 continue;
435 pptr = &commit_list_insert(new_parent, pptr)->next;
5da5c8f4 436 }
175785e5 437 }
0a617799 438 item->date = parse_commit_date(bufptr, tail);
27dedf0c 439
e2838d85 440 if (check_graph)
dade47c0 441 load_commit_graph_info(the_repository, item);
e2838d85 442
175785e5
DB
443 return 0;
444}
445
9b19adac 446int parse_commit_internal(struct commit *item, int quiet_on_missing, int use_commit_graph)
bd2c39f5 447{
21666f1a 448 enum object_type type;
bd2c39f5
NP
449 void *buffer;
450 unsigned long size;
451 int ret;
452
9786f68b
MK
453 if (!item)
454 return -1;
bd2c39f5
NP
455 if (item->object.parsed)
456 return 0;
dade47c0 457 if (use_commit_graph && parse_commit_in_graph(the_repository, item))
177722b3 458 return 0;
b4f5aca4 459 buffer = read_object_file(&item->object.oid, &type, &size);
bd2c39f5 460 if (!buffer)
9cc2b07a
JK
461 return quiet_on_missing ? -1 :
462 error("Could not read %s",
f2fd0760 463 oid_to_hex(&item->object.oid));
21666f1a 464 if (type != OBJ_COMMIT) {
bd2c39f5
NP
465 free(buffer);
466 return error("Object %s not a commit",
f2fd0760 467 oid_to_hex(&item->object.oid));
bd2c39f5 468 }
9b19adac 469
08f4f445 470 ret = parse_commit_buffer(the_repository, item, buffer, size, 0);
60ab26de 471 if (save_commit_buffer && !ret) {
5e0c6360 472 set_commit_buffer(the_repository, item, buffer, size);
3ff1fbbb
LT
473 return 0;
474 }
bd2c39f5
NP
475 free(buffer);
476 return ret;
477}
478
9b19adac
DS
479int parse_commit_gently(struct commit *item, int quiet_on_missing)
480{
481 return parse_commit_internal(item, quiet_on_missing, 1);
482}
483
7059dccc
JK
484void parse_commit_or_die(struct commit *item)
485{
486 if (parse_commit(item))
487 die("unable to parse commit %s",
f2fd0760 488 item ? oid_to_hex(&item->object.oid) : "(null)");
7059dccc
JK
489}
490
11af2aae
CC
491int find_commit_subject(const char *commit_buffer, const char **subject)
492{
493 const char *eol;
494 const char *p = commit_buffer;
495
496 while (*p && (*p != '\n' || p[1] != '\n'))
497 p++;
498 if (*p) {
4e1b06da 499 p = skip_blank_lines(p + 2);
9c9b03b1 500 eol = strchrnul(p, '\n');
11af2aae
CC
501 } else
502 eol = p;
503
504 *subject = p;
505
506 return eol - p;
507}
508
ac5155ef 509struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
dd97f850 510{
812666c8 511 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
dd97f850
DB
512 new_list->item = item;
513 new_list->next = *list_p;
514 *list_p = new_list;
ac5155ef 515 return new_list;
dd97f850
DB
516}
517
65319475
MV
518unsigned commit_list_count(const struct commit_list *l)
519{
520 unsigned c = 0;
521 for (; l; l = l->next )
522 c++;
523 return c;
524}
525
53d00b39
TR
526struct commit_list *copy_commit_list(struct commit_list *list)
527{
528 struct commit_list *head = NULL;
529 struct commit_list **pp = &head;
530 while (list) {
cb979dbd 531 pp = commit_list_append(list->item, pp);
53d00b39
TR
532 list = list->next;
533 }
534 return head;
535}
536
175785e5
DB
537void free_commit_list(struct commit_list *list)
538{
e510ab89
RS
539 while (list)
540 pop_commit(&list);
175785e5 541}
dd97f850 542
47e44ed1 543struct commit_list * commit_list_insert_by_date(struct commit *item, struct commit_list **list)
dd97f850
DB
544{
545 struct commit_list **pp = list;
546 struct commit_list *p;
547 while ((p = *pp) != NULL) {
548 if (p->item->date < item->date) {
549 break;
550 }
551 pp = &p->next;
552 }
f755494c 553 return commit_list_insert(item, pp);
dd97f850
DB
554}
555
46905893
RS
556static int commit_list_compare_by_date(const void *a, const void *b)
557{
dddbad72
JS
558 timestamp_t a_date = ((const struct commit_list *)a)->item->date;
559 timestamp_t b_date = ((const struct commit_list *)b)->item->date;
46905893
RS
560 if (a_date < b_date)
561 return 1;
562 if (a_date > b_date)
563 return -1;
564 return 0;
565}
566
567static void *commit_list_get_next(const void *a)
568{
569 return ((const struct commit_list *)a)->next;
570}
571
572static void commit_list_set_next(void *a, void *next)
573{
574 ((struct commit_list *)a)->next = next;
575}
a6080a0a 576
47e44ed1 577void commit_list_sort_by_date(struct commit_list **list)
dd97f850 578{
7365c95d
JH
579 *list = llist_mergesort(*list, commit_list_get_next, commit_list_set_next,
580 commit_list_compare_by_date);
dd97f850
DB
581}
582
58e28af6
DB
583struct commit *pop_most_recent_commit(struct commit_list **list,
584 unsigned int mark)
dd97f850 585{
e510ab89 586 struct commit *ret = pop_commit(list);
dd97f850 587 struct commit_list *parents = ret->parents;
dd97f850
DB
588
589 while (parents) {
4056c091 590 struct commit *commit = parents->item;
dec38c81 591 if (!parse_commit(commit) && !(commit->object.flags & mark)) {
58e28af6 592 commit->object.flags |= mark;
47e44ed1 593 commit_list_insert_by_date(commit, list);
4056c091 594 }
dd97f850
DB
595 parents = parents->next;
596 }
597 return ret;
598}
e3bc7a3b 599
941ba8db
NTND
600static void clear_commit_marks_1(struct commit_list **plist,
601 struct commit *commit, unsigned int mark)
f8f9c73c 602{
60fcc2e6
JS
603 while (commit) {
604 struct commit_list *parents;
f8f9c73c 605
60fcc2e6
JS
606 if (!(mark & commit->object.flags))
607 return;
58ecf5c1 608
60fcc2e6
JS
609 commit->object.flags &= ~mark;
610
611 parents = commit->parents;
612 if (!parents)
613 return;
614
615 while ((parents = parents->next))
941ba8db 616 commit_list_insert(parents->item, plist);
60fcc2e6
JS
617
618 commit = commit->parents->item;
f8f9c73c
JH
619 }
620}
621
e895cb51 622void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark)
941ba8db
NTND
623{
624 struct commit_list *list = NULL;
e895cb51
JH
625
626 while (nr--) {
07f7d55a 627 clear_commit_marks_1(&list, *commit, mark);
e895cb51
JH
628 commit++;
629 }
941ba8db
NTND
630 while (list)
631 clear_commit_marks_1(&list, pop_commit(&list), mark);
632}
633
e895cb51
JH
634void clear_commit_marks(struct commit *commit, unsigned int mark)
635{
636 clear_commit_marks_many(1, &commit, mark);
637}
638
a3437b8c
JS
639struct commit *pop_commit(struct commit_list **stack)
640{
641 struct commit_list *top = *stack;
642 struct commit *item = top ? top->item : NULL;
643
644 if (top) {
645 *stack = top->next;
646 free(top);
647 }
648 return item;
649}
650
a84b794a
JH
651/*
652 * Topological sort support
653 */
96c4f4a3 654
a84b794a
JH
655/* count number of children that have not been emitted */
656define_commit_slab(indegree_slab, int);
96c4f4a3 657
81c6b38b 658/* record author-date for each commit object */
18207030 659define_commit_slab(author_date_slab, timestamp_t);
81c6b38b
JH
660
661static void record_author_date(struct author_date_slab *author_date,
662 struct commit *commit)
663{
8597ea3a 664 const char *buffer = get_commit_buffer(commit, NULL);
81c6b38b 665 struct ident_split ident;
ea5517f0
JK
666 const char *ident_line;
667 size_t ident_len;
81c6b38b 668 char *date_end;
dddbad72 669 timestamp_t date;
81c6b38b 670
ea5517f0
JK
671 ident_line = find_commit_header(buffer, "author", &ident_len);
672 if (!ident_line)
673 goto fail_exit; /* no author line */
674 if (split_ident_line(&ident, ident_line, ident_len) ||
675 !ident.date_begin || !ident.date_end)
676 goto fail_exit; /* malformed "author" line */
81c6b38b 677
1aeb7e75 678 date = parse_timestamp(ident.date_begin, &date_end, 10);
81c6b38b
JH
679 if (date_end != ident.date_end)
680 goto fail_exit; /* malformed date */
681 *(author_date_slab_at(author_date, commit)) = date;
682
683fail_exit:
ba41c1c9 684 unuse_commit_buffer(commit, buffer);
81c6b38b
JH
685}
686
687static int compare_commits_by_author_date(const void *a_, const void *b_,
688 void *cb_data)
689{
690 const struct commit *a = a_, *b = b_;
691 struct author_date_slab *author_date = cb_data;
dddbad72
JS
692 timestamp_t a_date = *(author_date_slab_at(author_date, a));
693 timestamp_t b_date = *(author_date_slab_at(author_date, b));
81c6b38b
JH
694
695 /* newer commits with larger date first */
696 if (a_date < b_date)
697 return 1;
698 else if (a_date > b_date)
699 return -1;
700 return 0;
701}
702
3afc679b
DS
703int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, void *unused)
704{
705 const struct commit *a = a_, *b = b_;
706
707 /* newer commits first */
708 if (a->generation < b->generation)
709 return 1;
710 else if (a->generation > b->generation)
711 return -1;
712
713 /* use date as a heuristic when generations are equal */
714 if (a->date < b->date)
715 return 1;
716 else if (a->date > b->date)
717 return -1;
718 return 0;
719}
720
727377ff 721int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused)
da24b104
JH
722{
723 const struct commit *a = a_, *b = b_;
724 /* newer commits with larger date first */
725 if (a->date < b->date)
726 return 1;
727 else if (a->date > b->date)
728 return -1;
729 return 0;
730}
731
ab580ace
JS
732/*
733 * Performs an in-place topological sort on the list supplied.
734 */
da24b104 735void sort_in_topological_order(struct commit_list **list, enum rev_sort_order sort_order)
6b6dcfc2 736{
23c17d4a 737 struct commit_list *next, *orig = *list;
23c17d4a 738 struct commit_list **pptr;
a84b794a 739 struct indegree_slab indegree;
da24b104
JH
740 struct prio_queue queue;
741 struct commit *commit;
81c6b38b 742 struct author_date_slab author_date;
a6080a0a 743
23c17d4a 744 if (!orig)
7d6fb370 745 return;
23c17d4a
LT
746 *list = NULL;
747
a84b794a 748 init_indegree_slab(&indegree);
da24b104 749 memset(&queue, '\0', sizeof(queue));
81c6b38b 750
da24b104
JH
751 switch (sort_order) {
752 default: /* REV_SORT_IN_GRAPH_ORDER */
753 queue.compare = NULL;
754 break;
755 case REV_SORT_BY_COMMIT_DATE:
756 queue.compare = compare_commits_by_commit_date;
757 break;
81c6b38b
JH
758 case REV_SORT_BY_AUTHOR_DATE:
759 init_author_date_slab(&author_date);
760 queue.compare = compare_commits_by_author_date;
761 queue.cb_data = &author_date;
762 break;
da24b104 763 }
96c4f4a3 764
23c17d4a
LT
765 /* Mark them and clear the indegree */
766 for (next = orig; next; next = next->next) {
767 struct commit *commit = next->item;
a84b794a 768 *(indegree_slab_at(&indegree, commit)) = 1;
81c6b38b
JH
769 /* also record the author dates, if needed */
770 if (sort_order == REV_SORT_BY_AUTHOR_DATE)
771 record_author_date(&author_date, commit);
ab580ace 772 }
23c17d4a 773
ab580ace 774 /* update the indegree */
23c17d4a 775 for (next = orig; next; next = next->next) {
da24b104 776 struct commit_list *parents = next->item->parents;
ab580ace 777 while (parents) {
23c17d4a 778 struct commit *parent = parents->item;
a84b794a 779 int *pi = indegree_slab_at(&indegree, parent);
6b6dcfc2 780
96c4f4a3
JK
781 if (*pi)
782 (*pi)++;
23c17d4a 783 parents = parents->next;
ab580ace 784 }
ab580ace 785 }
23c17d4a 786
a6080a0a 787 /*
674d1727
PH
788 * find the tips
789 *
790 * tips are nodes not reachable from any other node in the list
791 *
792 * the tips serve as a starting set for the work queue.
793 */
23c17d4a
LT
794 for (next = orig; next; next = next->next) {
795 struct commit *commit = next->item;
ab580ace 796
a84b794a 797 if (*(indegree_slab_at(&indegree, commit)) == 1)
da24b104 798 prio_queue_put(&queue, commit);
ab580ace 799 }
4c8725f1 800
da24b104
JH
801 /*
802 * This is unfortunate; the initial tips need to be shown
803 * in the order given from the revision traversal machinery.
804 */
805 if (sort_order == REV_SORT_IN_GRAPH_ORDER)
806 prio_queue_reverse(&queue);
807
808 /* We no longer need the commit list */
809 free_commit_list(orig);
23c17d4a
LT
810
811 pptr = list;
812 *list = NULL;
da24b104
JH
813 while ((commit = prio_queue_get(&queue)) != NULL) {
814 struct commit_list *parents;
23c17d4a 815
23c17d4a 816 for (parents = commit->parents; parents ; parents = parents->next) {
cd2b8ae9 817 struct commit *parent = parents->item;
a84b794a 818 int *pi = indegree_slab_at(&indegree, parent);
23c17d4a 819
96c4f4a3 820 if (!*pi)
23c17d4a
LT
821 continue;
822
823 /*
824 * parents are only enqueued for emission
825 * when all their children have been emitted thereby
826 * guaranteeing topological order.
827 */
da24b104
JH
828 if (--(*pi) == 1)
829 prio_queue_put(&queue, parent);
ab580ace
JS
830 }
831 /*
da24b104
JH
832 * all children of commit have already been
833 * emitted. we can emit it now.
674d1727 834 */
a84b794a 835 *(indegree_slab_at(&indegree, commit)) = 0;
da24b104
JH
836
837 pptr = &commit_list_insert(commit, pptr)->next;
ab580ace 838 }
96c4f4a3 839
a84b794a 840 clear_indegree_slab(&indegree);
da24b104 841 clear_prio_queue(&queue);
81c6b38b
JH
842 if (sort_order == REV_SORT_BY_AUTHOR_DATE)
843 clear_author_date_slab(&author_date);
ab580ace 844}
7c6f8aaf 845
1295228d 846/* merge-base stuff */
7c6f8aaf 847
208acbfb 848/* Remember to update object flag allocation in object.h */
577ed5c2
JH
849#define PARENT1 (1u<<16)
850#define PARENT2 (1u<<17)
851#define STALE (1u<<18)
852#define RESULT (1u<<19)
7c6f8aaf 853
1295228d
JH
854static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
855
73f43f22 856static int queue_has_nonstale(struct prio_queue *queue)
7c6f8aaf 857{
73f43f22
JK
858 int i;
859 for (i = 0; i < queue->nr; i++) {
860 struct commit *commit = queue->array[i].data;
861 if (!(commit->object.flags & STALE))
862 return 1;
7c6f8aaf 863 }
73f43f22 864 return 0;
7c6f8aaf
JS
865}
866
d866924a 867/* all input commits in one and twos[] must have been parsed! */
d7c1ec3e
DS
868static struct commit_list *paint_down_to_common(struct commit *one, int n,
869 struct commit **twos,
870 int min_generation)
7c6f8aaf 871{
3afc679b 872 struct prio_queue queue = { compare_commits_by_gen_then_commit_date };
7c6f8aaf 873 struct commit_list *result = NULL;
6a938648 874 int i;
d7c1ec3e 875 uint32_t last_gen = GENERATION_NUMBER_INFINITY;
7c6f8aaf 876
091f4cf3
DS
877 if (!min_generation)
878 queue.compare = compare_commits_by_commit_date;
879
f3249438 880 one->object.flags |= PARENT1;
73f43f22
JK
881 if (!n) {
882 commit_list_append(one, &result);
883 return result;
884 }
885 prio_queue_put(&queue, one);
886
6a938648
JH
887 for (i = 0; i < n; i++) {
888 twos[i]->object.flags |= PARENT2;
73f43f22 889 prio_queue_put(&queue, twos[i]);
6a938648 890 }
7c6f8aaf 891
73f43f22
JK
892 while (queue_has_nonstale(&queue)) {
893 struct commit *commit = prio_queue_get(&queue);
7c6f8aaf 894 struct commit_list *parents;
f3249438 895 int flags;
7c6f8aaf 896
091f4cf3 897 if (min_generation && commit->generation > last_gen)
d7c1ec3e
DS
898 BUG("bad generation skip %8x > %8x at %s",
899 commit->generation, last_gen,
900 oid_to_hex(&commit->object.oid));
901 last_gen = commit->generation;
902
903 if (commit->generation < min_generation)
904 break;
905
f3249438
JH
906 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
907 if (flags == (PARENT1 | PARENT2)) {
908 if (!(commit->object.flags & RESULT)) {
909 commit->object.flags |= RESULT;
47e44ed1 910 commit_list_insert_by_date(commit, &result);
f3249438 911 }
542ccefe
JH
912 /* Mark parents of a found merge stale */
913 flags |= STALE;
7c6f8aaf
JS
914 }
915 parents = commit->parents;
916 while (parents) {
917 struct commit *p = parents->item;
918 parents = parents->next;
919 if ((p->object.flags & flags) == flags)
920 continue;
172947e6
MK
921 if (parse_commit(p))
922 return NULL;
7c6f8aaf 923 p->object.flags |= flags;
73f43f22 924 prio_queue_put(&queue, p);
7c6f8aaf
JS
925 }
926 }
927
73f43f22 928 clear_prio_queue(&queue);
da1f5156
JH
929 return result;
930}
931
932static struct commit_list *merge_bases_many(struct commit *one, int n, struct commit **twos)
933{
934 struct commit_list *list = NULL;
935 struct commit_list *result = NULL;
936 int i;
937
938 for (i = 0; i < n; i++) {
939 if (one == twos[i])
940 /*
941 * We do not mark this even with RESULT so we do not
942 * have to clean it up.
943 */
944 return commit_list_insert(one, &result);
945 }
946
947 if (parse_commit(one))
948 return NULL;
949 for (i = 0; i < n; i++) {
950 if (parse_commit(twos[i]))
951 return NULL;
952 }
953
d7c1ec3e 954 list = paint_down_to_common(one, n, twos, 0);
da1f5156 955
f3249438 956 while (list) {
e510ab89
RS
957 struct commit *commit = pop_commit(&list);
958 if (!(commit->object.flags & STALE))
959 commit_list_insert_by_date(commit, &result);
f3249438
JH
960 }
961 return result;
962}
7c6f8aaf 963
5240c9d7
MV
964struct commit_list *get_octopus_merge_bases(struct commit_list *in)
965{
966 struct commit_list *i, *j, *k, *ret = NULL;
5240c9d7 967
6bc76725
VM
968 if (!in)
969 return ret;
970
971 commit_list_insert(in->item, &ret);
972
973 for (i = in->next; i; i = i->next) {
258c03eb 974 struct commit_list *new_commits = NULL, *end = NULL;
6bc76725
VM
975
976 for (j = ret; j; j = j->next) {
977 struct commit_list *bases;
2ce406cc 978 bases = get_merge_bases(i->item, j->item);
258c03eb
BW
979 if (!new_commits)
980 new_commits = bases;
6bc76725
VM
981 else
982 end->next = bases;
983 for (k = bases; k; k = k->next)
984 end = k;
5240c9d7 985 }
258c03eb 986 ret = new_commits;
5240c9d7
MV
987 }
988 return ret;
989}
990
94f0ced0
JH
991static int remove_redundant(struct commit **array, int cnt)
992{
993 /*
994 * Some commit in the array may be an ancestor of
995 * another commit. Move such commit to the end of
996 * the array, and return the number of commits that
997 * are independent from each other.
998 */
999 struct commit **work;
1000 unsigned char *redundant;
1001 int *filled_index;
1002 int i, j, filled;
1003
1004 work = xcalloc(cnt, sizeof(*work));
1005 redundant = xcalloc(cnt, 1);
b32fa95f 1006 ALLOC_ARRAY(filled_index, cnt - 1);
94f0ced0 1007
d866924a
JH
1008 for (i = 0; i < cnt; i++)
1009 parse_commit(array[i]);
94f0ced0
JH
1010 for (i = 0; i < cnt; i++) {
1011 struct commit_list *common;
04bc8d1e 1012 uint32_t min_generation = array[i]->generation;
94f0ced0
JH
1013
1014 if (redundant[i])
1015 continue;
1016 for (j = filled = 0; j < cnt; j++) {
1017 if (i == j || redundant[j])
1018 continue;
1019 filled_index[filled] = j;
1020 work[filled++] = array[j];
04bc8d1e
DS
1021
1022 if (array[j]->generation < min_generation)
1023 min_generation = array[j]->generation;
94f0ced0 1024 }
04bc8d1e
DS
1025 common = paint_down_to_common(array[i], filled, work,
1026 min_generation);
94f0ced0
JH
1027 if (array[i]->object.flags & PARENT2)
1028 redundant[i] = 1;
1029 for (j = 0; j < filled; j++)
1030 if (work[j]->object.flags & PARENT1)
1031 redundant[filled_index[j]] = 1;
1032 clear_commit_marks(array[i], all_flags);
abc03512 1033 clear_commit_marks_many(filled, work, all_flags);
94f0ced0
JH
1034 free_commit_list(common);
1035 }
1036
1037 /* Now collect the result */
45ccef87 1038 COPY_ARRAY(work, array, cnt);
94f0ced0
JH
1039 for (i = filled = 0; i < cnt; i++)
1040 if (!redundant[i])
1041 array[filled++] = work[i];
1042 for (j = filled, i = 0; i < cnt; i++)
1043 if (redundant[i])
1044 array[j++] = work[i];
1045 free(work);
1046 free(redundant);
1047 free(filled_index);
1048 return filled;
1049}
1050
2ce406cc
JH
1051static struct commit_list *get_merge_bases_many_0(struct commit *one,
1052 int n,
1053 struct commit **twos,
1054 int cleanup)
f3249438 1055{
f3249438
JH
1056 struct commit_list *list;
1057 struct commit **rslt;
1058 struct commit_list *result;
94f0ced0 1059 int cnt, i;
f3249438 1060
6a938648
JH
1061 result = merge_bases_many(one, n, twos);
1062 for (i = 0; i < n; i++) {
1063 if (one == twos[i])
1064 return result;
1065 }
f3249438
JH
1066 if (!result || !result->next) {
1067 if (cleanup) {
1068 clear_commit_marks(one, all_flags);
e895cb51 1069 clear_commit_marks_many(n, twos, all_flags);
7c6f8aaf 1070 }
f3249438 1071 return result;
7c6f8aaf
JS
1072 }
1073
f3249438 1074 /* There are more than one */
4bbaa1eb 1075 cnt = commit_list_count(result);
f3249438
JH
1076 rslt = xcalloc(cnt, sizeof(*rslt));
1077 for (list = result, i = 0; list; list = list->next)
1078 rslt[i++] = list->item;
1079 free_commit_list(result);
1080
1081 clear_commit_marks(one, all_flags);
e895cb51 1082 clear_commit_marks_many(n, twos, all_flags);
7c6f8aaf 1083
94f0ced0 1084 cnt = remove_redundant(rslt, cnt);
f3249438 1085 result = NULL;
94f0ced0
JH
1086 for (i = 0; i < cnt; i++)
1087 commit_list_insert_by_date(rslt[i], &result);
f3249438 1088 free(rslt);
7c6f8aaf
JS
1089 return result;
1090}
2ecd2bbc 1091
2ce406cc
JH
1092struct commit_list *get_merge_bases_many(struct commit *one,
1093 int n,
1094 struct commit **twos)
1095{
1096 return get_merge_bases_many_0(one, n, twos, 1);
1097}
1098
1099struct commit_list *get_merge_bases_many_dirty(struct commit *one,
1100 int n,
1101 struct commit **twos)
1102{
1103 return get_merge_bases_many_0(one, n, twos, 0);
1104}
1105
1106struct commit_list *get_merge_bases(struct commit *one, struct commit *two)
6a938648 1107{
2ce406cc 1108 return get_merge_bases_many_0(one, 1, &two, 1);
6a938648
JH
1109}
1110
a20efee9 1111/*
41ccfdd9 1112 * Is "commit" a descendant of one of the elements on the "with_commit" list?
a20efee9 1113 */
7fcdb36e
JG
1114int is_descendant_of(struct commit *commit, struct commit_list *with_commit)
1115{
1116 if (!with_commit)
1117 return 1;
1118 while (with_commit) {
1119 struct commit *other;
1120
1121 other = with_commit->item;
1122 with_commit = with_commit->next;
a20efee9 1123 if (in_merge_bases(other, commit))
7fcdb36e
JG
1124 return 1;
1125 }
1126 return 0;
1127}
1128
a20efee9 1129/*
4c4b27e8 1130 * Is "commit" an ancestor of one of the "references"?
a20efee9 1131 */
4c4b27e8 1132int in_merge_bases_many(struct commit *commit, int nr_reference, struct commit **reference)
2ecd2bbc 1133{
6440fdba 1134 struct commit_list *bases;
4c4b27e8 1135 int ret = 0, i;
f9b8908b 1136 uint32_t min_generation = GENERATION_NUMBER_INFINITY;
2ecd2bbc 1137
4c4b27e8 1138 if (parse_commit(commit))
6440fdba 1139 return ret;
f9b8908b 1140 for (i = 0; i < nr_reference; i++) {
4c4b27e8
JH
1141 if (parse_commit(reference[i]))
1142 return ret;
f9b8908b
DS
1143 if (reference[i]->generation < min_generation)
1144 min_generation = reference[i]->generation;
1145 }
1146
1147 if (commit->generation > min_generation)
1148 return ret;
2ecd2bbc 1149
d7c1ec3e 1150 bases = paint_down_to_common(commit, nr_reference, reference, commit->generation);
6440fdba
JH
1151 if (commit->object.flags & PARENT2)
1152 ret = 1;
b0f9e9ee 1153 clear_commit_marks(commit, all_flags);
557899ff 1154 clear_commit_marks_many(nr_reference, reference, all_flags);
2ecd2bbc
JH
1155 free_commit_list(bases);
1156 return ret;
1157}
98cf9c3b 1158
4c4b27e8
JH
1159/*
1160 * Is "commit" an ancestor of (i.e. reachable from) the "reference"?
1161 */
1162int in_merge_bases(struct commit *commit, struct commit *reference)
1163{
1164 return in_merge_bases_many(commit, 1, &reference);
1165}
1166
98cf9c3b
JH
1167struct commit_list *reduce_heads(struct commit_list *heads)
1168{
1169 struct commit_list *p;
1170 struct commit_list *result = NULL, **tail = &result;
f37d3c75
JH
1171 struct commit **array;
1172 int num_head, i;
98cf9c3b
JH
1173
1174 if (!heads)
1175 return NULL;
1176
f37d3c75
JH
1177 /* Uniquify */
1178 for (p = heads; p; p = p->next)
1179 p->item->object.flags &= ~STALE;
1180 for (p = heads, num_head = 0; p; p = p->next) {
1181 if (p->item->object.flags & STALE)
711f6b29 1182 continue;
f37d3c75
JH
1183 p->item->object.flags |= STALE;
1184 num_head++;
1185 }
c4a7b009 1186 array = xcalloc(num_head, sizeof(*array));
f37d3c75
JH
1187 for (p = heads, i = 0; p; p = p->next) {
1188 if (p->item->object.flags & STALE) {
1189 array[i++] = p->item;
1190 p->item->object.flags &= ~STALE;
98cf9c3b 1191 }
98cf9c3b 1192 }
f37d3c75
JH
1193 num_head = remove_redundant(array, num_head);
1194 for (i = 0; i < num_head; i++)
1195 tail = &commit_list_insert(array[i], tail)->next;
cb7b29eb 1196 free(array);
98cf9c3b
JH
1197 return result;
1198}
40d52ff7 1199
4da72644
1200void reduce_heads_replace(struct commit_list **heads)
1201{
1202 struct commit_list *result = reduce_heads(*heads);
1203 free_commit_list(*heads);
1204 *heads = result;
1205}
1206
ba3c69a9
JH
1207static const char gpg_sig_header[] = "gpgsig";
1208static const int gpg_sig_header_len = sizeof(gpg_sig_header) - 1;
1209
1210static int do_sign_commit(struct strbuf *buf, const char *keyid)
1211{
1212 struct strbuf sig = STRBUF_INIT;
1213 int inspos, copypos;
3324dd8f 1214 const char *eoh;
ba3c69a9
JH
1215
1216 /* find the end of the header */
3324dd8f
JS
1217 eoh = strstr(buf->buf, "\n\n");
1218 if (!eoh)
1219 inspos = buf->len;
1220 else
1221 inspos = eoh - buf->buf + 1;
ba3c69a9
JH
1222
1223 if (!keyid || !*keyid)
1224 keyid = get_signing_key();
1225 if (sign_buffer(buf, &sig, keyid)) {
1226 strbuf_release(&sig);
1227 return -1;
1228 }
1229
1230 for (copypos = 0; sig.buf[copypos]; ) {
1231 const char *bol = sig.buf + copypos;
1232 const char *eol = strchrnul(bol, '\n');
1233 int len = (eol - bol) + !!*eol;
1234
1235 if (!copypos) {
1236 strbuf_insert(buf, inspos, gpg_sig_header, gpg_sig_header_len);
1237 inspos += gpg_sig_header_len;
1238 }
1239 strbuf_insert(buf, inspos++, " ", 1);
1240 strbuf_insert(buf, inspos, bol, len);
1241 inspos += len;
1242 copypos += len;
1243 }
1244 strbuf_release(&sig);
1245 return 0;
1246}
1247
218aa3a6 1248int parse_signed_commit(const struct commit *commit,
0c37f1fc
JH
1249 struct strbuf *payload, struct strbuf *signature)
1250{
218aa3a6 1251
0c37f1fc 1252 unsigned long size;
218aa3a6 1253 const char *buffer = get_commit_buffer(commit, &size);
0c37f1fc 1254 int in_signature, saw_signature = -1;
218aa3a6 1255 const char *line, *tail;
0c37f1fc
JH
1256
1257 line = buffer;
1258 tail = buffer + size;
1259 in_signature = 0;
1260 saw_signature = 0;
1261 while (line < tail) {
1262 const char *sig = NULL;
218aa3a6 1263 const char *next = memchr(line, '\n', tail - line);
0c37f1fc
JH
1264
1265 next = next ? next + 1 : tail;
1266 if (in_signature && line[0] == ' ')
1267 sig = line + 1;
59556548 1268 else if (starts_with(line, gpg_sig_header) &&
0c37f1fc
JH
1269 line[gpg_sig_header_len] == ' ')
1270 sig = line + gpg_sig_header_len + 1;
1271 if (sig) {
1272 strbuf_add(signature, sig, next - sig);
1273 saw_signature = 1;
1274 in_signature = 1;
1275 } else {
1276 if (*line == '\n')
1277 /* dump the whole remainder of the buffer */
1278 next = tail;
1279 strbuf_add(payload, line, next - line);
1280 in_signature = 0;
1281 }
1282 line = next;
1283 }
218aa3a6 1284 unuse_commit_buffer(commit, buffer);
0c37f1fc
JH
1285 return saw_signature;
1286}
1287
0b05ab6f
CC
1288int remove_signature(struct strbuf *buf)
1289{
1290 const char *line = buf->buf;
1291 const char *tail = buf->buf + buf->len;
1292 int in_signature = 0;
1293 const char *sig_start = NULL;
1294 const char *sig_end = NULL;
1295
1296 while (line < tail) {
1297 const char *next = memchr(line, '\n', tail - line);
1298 next = next ? next + 1 : tail;
1299
1300 if (in_signature && line[0] == ' ')
1301 sig_end = next;
1302 else if (starts_with(line, gpg_sig_header) &&
1303 line[gpg_sig_header_len] == ' ') {
1304 sig_start = line;
1305 sig_end = next;
1306 in_signature = 1;
1307 } else {
1308 if (*line == '\n')
1309 /* dump the whole remainder of the buffer */
1310 next = tail;
1311 in_signature = 0;
1312 }
1313 line = next;
1314 }
1315
1316 if (sig_start)
1317 strbuf_remove(buf, sig_start - buf->buf, sig_end - sig_start);
1318
1319 return sig_start != NULL;
1320}
1321
5231c633
JH
1322static void handle_signed_tag(struct commit *parent, struct commit_extra_header ***tail)
1323{
1324 struct merge_remote_desc *desc;
1325 struct commit_extra_header *mergetag;
1326 char *buf;
1327 unsigned long size, len;
1328 enum object_type type;
1329
1330 desc = merge_remote_util(parent);
1331 if (!desc || !desc->obj)
1332 return;
b4f5aca4 1333 buf = read_object_file(&desc->obj->oid, &type, &size);
5231c633
JH
1334 if (!buf || type != OBJ_TAG)
1335 goto free_return;
1336 len = parse_signature(buf, size);
1337 if (size == len)
1338 goto free_return;
1339 /*
1340 * We could verify this signature and either omit the tag when
1341 * it does not validate, but the integrator may not have the
1342 * public key of the signer of the tag he is merging, while a
1343 * later auditor may have it while auditing, so let's not run
1344 * verify-signed-buffer here for now...
1345 *
1346 * if (verify_signed_buffer(buf, len, buf + len, size - len, ...))
1347 * warn("warning: signed tag unverified.");
1348 */
1349 mergetag = xcalloc(1, sizeof(*mergetag));
1350 mergetag->key = xstrdup("mergetag");
1351 mergetag->value = buf;
1352 mergetag->len = size;
1353
1354 **tail = mergetag;
1355 *tail = &mergetag->next;
1356 return;
1357
1358free_return:
1359 free(buf);
1360}
1361
434060ec 1362int check_commit_signature(const struct commit *commit, struct signature_check *sigc)
ffb6d7d5
SG
1363{
1364 struct strbuf payload = STRBUF_INIT;
1365 struct strbuf signature = STRBUF_INIT;
434060ec 1366 int ret = 1;
ffb6d7d5
SG
1367
1368 sigc->result = 'N';
1369
218aa3a6 1370 if (parse_signed_commit(commit, &payload, &signature) <= 0)
ffb6d7d5 1371 goto out;
434060ec 1372 ret = check_signature(payload.buf, payload.len, signature.buf,
1373 signature.len, sigc);
ffb6d7d5
SG
1374
1375 out:
ffb6d7d5
SG
1376 strbuf_release(&payload);
1377 strbuf_release(&signature);
434060ec 1378
1379 return ret;
ffb6d7d5
SG
1380}
1381
1382
1383
5231c633
JH
1384void append_merge_tag_headers(struct commit_list *parents,
1385 struct commit_extra_header ***tail)
1386{
1387 while (parents) {
1388 struct commit *parent = parents->item;
1389 handle_signed_tag(parent, tail);
1390 parents = parents->next;
1391 }
1392}
1393
1394static void add_extra_header(struct strbuf *buffer,
1395 struct commit_extra_header *extra)
1396{
1397 strbuf_addstr(buffer, extra->key);
ed7a42a0
JH
1398 if (extra->len)
1399 strbuf_add_lines(buffer, " ", extra->value, extra->len);
1400 else
1401 strbuf_addch(buffer, '\n');
1402}
1403
c871a1d1
JH
1404struct commit_extra_header *read_commit_extra_headers(struct commit *commit,
1405 const char **exclude)
ed7a42a0
JH
1406{
1407 struct commit_extra_header *extra = NULL;
1408 unsigned long size;
218aa3a6
JK
1409 const char *buffer = get_commit_buffer(commit, &size);
1410 extra = read_commit_extra_header_lines(buffer, size, exclude);
1411 unuse_commit_buffer(commit, buffer);
ed7a42a0
JH
1412 return extra;
1413}
1414
fef461ea 1415int for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data)
063da62b
CC
1416{
1417 struct commit_extra_header *extra, *to_free;
fef461ea 1418 int res = 0;
063da62b
CC
1419
1420 to_free = read_commit_extra_headers(commit, NULL);
fef461ea 1421 for (extra = to_free; !res && extra; extra = extra->next) {
063da62b
CC
1422 if (strcmp(extra->key, "mergetag"))
1423 continue; /* not a merge tag */
fef461ea 1424 res = fn(commit, extra, data);
063da62b
CC
1425 }
1426 free_commit_extra_headers(to_free);
fef461ea 1427 return res;
063da62b
CC
1428}
1429
ed7a42a0
JH
1430static inline int standard_header_field(const char *field, size_t len)
1431{
b072504c
RS
1432 return ((len == 4 && !memcmp(field, "tree", 4)) ||
1433 (len == 6 && !memcmp(field, "parent", 6)) ||
1434 (len == 6 && !memcmp(field, "author", 6)) ||
1435 (len == 9 && !memcmp(field, "committer", 9)) ||
1436 (len == 8 && !memcmp(field, "encoding", 8)));
ed7a42a0
JH
1437}
1438
c871a1d1
JH
1439static int excluded_header_field(const char *field, size_t len, const char **exclude)
1440{
1441 if (!exclude)
1442 return 0;
1443
1444 while (*exclude) {
1445 size_t xlen = strlen(*exclude);
b072504c 1446 if (len == xlen && !memcmp(field, *exclude, xlen))
c871a1d1
JH
1447 return 1;
1448 exclude++;
1449 }
1450 return 0;
1451}
1452
82a75299
JH
1453static struct commit_extra_header *read_commit_extra_header_lines(
1454 const char *buffer, size_t size,
1455 const char **exclude)
ed7a42a0
JH
1456{
1457 struct commit_extra_header *extra = NULL, **tail = &extra, *it = NULL;
1458 const char *line, *next, *eof, *eob;
1459 struct strbuf buf = STRBUF_INIT;
1460
1461 for (line = buffer, eob = line + size;
1462 line < eob && *line != '\n';
1463 line = next) {
1464 next = memchr(line, '\n', eob - line);
1465 next = next ? next + 1 : eob;
1466 if (*line == ' ') {
1467 /* continuation */
1468 if (it)
1469 strbuf_add(&buf, line + 1, next - (line + 1));
1470 continue;
1471 }
1472 if (it)
1473 it->value = strbuf_detach(&buf, &it->len);
1474 strbuf_reset(&buf);
1475 it = NULL;
1476
50a01cc4
RS
1477 eof = memchr(line, ' ', next - line);
1478 if (!eof)
ed7a42a0 1479 eof = next;
b072504c
RS
1480 else if (standard_header_field(line, eof - line) ||
1481 excluded_header_field(line, eof - line, exclude))
ed7a42a0
JH
1482 continue;
1483
1484 it = xcalloc(1, sizeof(*it));
1485 it->key = xmemdupz(line, eof-line);
1486 *tail = it;
1487 tail = &it->next;
1488 if (eof + 1 < next)
1489 strbuf_add(&buf, eof + 1, next - (eof + 1));
1490 }
1491 if (it)
1492 it->value = strbuf_detach(&buf, &it->len);
1493 return extra;
5231c633
JH
1494}
1495
1496void free_commit_extra_headers(struct commit_extra_header *extra)
1497{
1498 while (extra) {
1499 struct commit_extra_header *next = extra->next;
1500 free(extra->key);
1501 free(extra->value);
1502 free(extra);
1503 extra = next;
1504 }
1505}
1506
5078f344
PO
1507int commit_tree(const char *msg, size_t msg_len, const struct object_id *tree,
1508 struct commit_list *parents, struct object_id *ret,
ba3c69a9 1509 const char *author, const char *sign_commit)
5231c633
JH
1510{
1511 struct commit_extra_header *extra = NULL, **tail = &extra;
1512 int result;
1513
1514 append_merge_tag_headers(parents, &tail);
3ffefb54 1515 result = commit_tree_extended(msg, msg_len, tree, parents, ret,
ba3c69a9 1516 author, sign_commit, extra);
5231c633
JH
1517 free_commit_extra_headers(extra);
1518 return result;
1519}
1520
08a94a14
LT
1521static int find_invalid_utf8(const char *buf, int len)
1522{
1523 int offset = 0;
e82bd6cc 1524 static const unsigned int max_codepoint[] = {
1525 0x7f, 0x7ff, 0xffff, 0x10ffff
1526 };
08a94a14
LT
1527
1528 while (len) {
1529 unsigned char c = *buf++;
1530 int bytes, bad_offset;
28110d4b 1531 unsigned int codepoint;
e82bd6cc 1532 unsigned int min_val, max_val;
08a94a14
LT
1533
1534 len--;
1535 offset++;
1536
1537 /* Simple US-ASCII? No worries. */
1538 if (c < 0x80)
1539 continue;
1540
1541 bad_offset = offset-1;
1542
1543 /*
1544 * Count how many more high bits set: that's how
1545 * many more bytes this sequence should have.
1546 */
1547 bytes = 0;
1548 while (c & 0x40) {
1549 c <<= 1;
1550 bytes++;
1551 }
1552
28110d4b 1553 /*
1554 * Must be between 1 and 3 more bytes. Longer sequences result in
1555 * codepoints beyond U+10FFFF, which are guaranteed never to exist.
1556 */
1557 if (bytes < 1 || 3 < bytes)
08a94a14
LT
1558 return bad_offset;
1559
1560 /* Do we *have* that many bytes? */
1561 if (len < bytes)
1562 return bad_offset;
1563
e82bd6cc 1564 /*
1565 * Place the encoded bits at the bottom of the value and compute the
1566 * valid range.
1567 */
28110d4b 1568 codepoint = (c & 0x7f) >> bytes;
e82bd6cc 1569 min_val = max_codepoint[bytes-1] + 1;
1570 max_val = max_codepoint[bytes];
28110d4b 1571
08a94a14
LT
1572 offset += bytes;
1573 len -= bytes;
1574
1575 /* And verify that they are good continuation bytes */
1576 do {
28110d4b 1577 codepoint <<= 6;
1578 codepoint |= *buf & 0x3f;
08a94a14
LT
1579 if ((*buf++ & 0xc0) != 0x80)
1580 return bad_offset;
1581 } while (--bytes);
1582
e82bd6cc 1583 /* Reject codepoints that are out of range for the sequence length. */
1584 if (codepoint < min_val || codepoint > max_val)
28110d4b 1585 return bad_offset;
1586 /* Surrogates are only for UTF-16 and cannot be encoded in UTF-8. */
1587 if ((codepoint & 0x1ff800) == 0xd800)
1588 return bad_offset;
81050ac6 1589 /* U+xxFFFE and U+xxFFFF are guaranteed non-characters. */
dc773a67 1590 if ((codepoint & 0xfffe) == 0xfffe)
81050ac6
PK
1591 return bad_offset;
1592 /* So are anything in the range U+FDD0..U+FDEF. */
1593 if (codepoint >= 0xfdd0 && codepoint <= 0xfdef)
28110d4b 1594 return bad_offset;
08a94a14
LT
1595 }
1596 return -1;
1597}
1598
1599/*
1600 * This verifies that the buffer is in proper utf8 format.
1601 *
1602 * If it isn't, it assumes any non-utf8 characters are Latin1,
1603 * and does the conversion.
08a94a14
LT
1604 */
1605static int verify_utf8(struct strbuf *buf)
1606{
1607 int ok = 1;
1608 long pos = 0;
1609
1610 for (;;) {
1611 int bad;
1612 unsigned char c;
1613 unsigned char replace[2];
1614
1615 bad = find_invalid_utf8(buf->buf + pos, buf->len - pos);
1616 if (bad < 0)
1617 return ok;
1618 pos += bad;
1619 ok = 0;
1620 c = buf->buf[pos];
1621 strbuf_remove(buf, pos, 1);
1622
1623 /* We know 'c' must be in the range 128-255 */
1624 replace[0] = 0xc0 + (c >> 6);
1625 replace[1] = 0x80 + (c & 0x3f);
1626 strbuf_insert(buf, pos, replace, 2);
1627 pos += 2;
1628 }
1629}
1630
40d52ff7 1631static const char commit_utf8_warn[] =
4fa4b315
VA
1632N_("Warning: commit message did not conform to UTF-8.\n"
1633 "You may want to amend it after fixing the message, or set the config\n"
1634 "variable i18n.commitencoding to the encoding your project uses.\n");
40d52ff7 1635
3ffefb54 1636int commit_tree_extended(const char *msg, size_t msg_len,
5078f344
PO
1637 const struct object_id *tree,
1638 struct commit_list *parents, struct object_id *ret,
ba3c69a9
JH
1639 const char *author, const char *sign_commit,
1640 struct commit_extra_header *extra)
40d52ff7
JK
1641{
1642 int result;
1643 int encoding_is_utf8;
1644 struct strbuf buffer;
1645
e816caa0 1646 assert_oid_type(tree, OBJ_TREE);
40d52ff7 1647
3ffefb54 1648 if (memchr(msg, '\0', msg_len))
37576c14
NTND
1649 return error("a NUL byte in commit log message not allowed.");
1650
40d52ff7
JK
1651 /* Not having i18n.commitencoding is the same as having utf-8 */
1652 encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
1653
1654 strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */
5078f344 1655 strbuf_addf(&buffer, "tree %s\n", oid_to_hex(tree));
40d52ff7
JK
1656
1657 /*
1658 * NOTE! This ordering means that the same exact tree merged with a
1659 * different order of parents will be a _different_ changeset even
1660 * if everything else stays the same.
1661 */
1662 while (parents) {
e510ab89 1663 struct commit *parent = pop_commit(&parents);
40d52ff7 1664 strbuf_addf(&buffer, "parent %s\n",
f2fd0760 1665 oid_to_hex(&parent->object.oid));
40d52ff7
JK
1666 }
1667
1668 /* Person/date information */
1669 if (!author)
f9bc573f 1670 author = git_author_info(IDENT_STRICT);
40d52ff7 1671 strbuf_addf(&buffer, "author %s\n", author);
f9bc573f 1672 strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_STRICT));
40d52ff7
JK
1673 if (!encoding_is_utf8)
1674 strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
5231c633
JH
1675
1676 while (extra) {
1677 add_extra_header(&buffer, extra);
1678 extra = extra->next;
1679 }
40d52ff7
JK
1680 strbuf_addch(&buffer, '\n');
1681
1682 /* And add the comment */
3ffefb54 1683 strbuf_add(&buffer, msg, msg_len);
40d52ff7
JK
1684
1685 /* And check the encoding */
08a94a14 1686 if (encoding_is_utf8 && !verify_utf8(&buffer))
4fa4b315 1687 fprintf(stderr, _(commit_utf8_warn));
40d52ff7 1688
e505146d
RS
1689 if (sign_commit && do_sign_commit(&buffer, sign_commit)) {
1690 result = -1;
1691 goto out;
1692 }
ba3c69a9 1693
a09c985e 1694 result = write_object_file(buffer.buf, buffer.len, commit_type, ret);
e505146d 1695out:
40d52ff7
JK
1696 strbuf_release(&buffer);
1697 return result;
1698}
ae8e4c9c 1699
e2e5ac23
NTND
1700define_commit_slab(merge_desc_slab, struct merge_remote_desc *);
1701static struct merge_desc_slab merge_desc_slab = COMMIT_SLAB_INIT(1, merge_desc_slab);
1702
1703struct merge_remote_desc *merge_remote_util(struct commit *commit)
1704{
1705 return *merge_desc_slab_at(&merge_desc_slab, commit);
1706}
1707
beb518c9
RS
1708void set_merge_remote_desc(struct commit *commit,
1709 const char *name, struct object *obj)
1710{
1711 struct merge_remote_desc *desc;
5447a76a 1712 FLEX_ALLOC_STR(desc, name, name);
beb518c9 1713 desc->obj = obj;
e2e5ac23 1714 *merge_desc_slab_at(&merge_desc_slab, commit) = desc;
beb518c9
RS
1715}
1716
ae8e4c9c
JH
1717struct commit *get_merge_parent(const char *name)
1718{
1719 struct object *obj;
1720 struct commit *commit;
7683e2e6 1721 struct object_id oid;
e82caf38 1722 if (get_oid(name, &oid))
ae8e4c9c 1723 return NULL;
109cd76d 1724 obj = parse_object(the_repository, &oid);
ae8e4c9c 1725 commit = (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
e2e5ac23 1726 if (commit && !merge_remote_util(commit))
beb518c9 1727 set_merge_remote_desc(commit, name, obj);
ae8e4c9c
JH
1728 return commit;
1729}
89b5f1d9
RS
1730
1731/*
1732 * Append a commit to the end of the commit_list.
1733 *
1734 * next starts by pointing to the variable that holds the head of an
1735 * empty commit_list, and is updated to point to the "next" field of
1736 * the last item on the list as new commits are appended.
1737 *
1738 * Usage example:
1739 *
1740 * struct commit_list *list;
1741 * struct commit_list **next = &list;
1742 *
1743 * next = commit_list_append(c1, next);
1744 * next = commit_list_append(c2, next);
1745 * assert(commit_list_count(list) == 2);
1746 * return list;
1747 */
1748struct commit_list **commit_list_append(struct commit *commit,
1749 struct commit_list **next)
1750{
258c03eb
BW
1751 struct commit_list *new_commit = xmalloc(sizeof(struct commit_list));
1752 new_commit->item = commit;
1753 *next = new_commit;
1754 new_commit->next = NULL;
1755 return &new_commit->next;
89b5f1d9 1756}
efc7df45 1757
fe6eb7f2
JK
1758const char *find_commit_header(const char *msg, const char *key, size_t *out_len)
1759{
1760 int key_len = strlen(key);
1761 const char *line = msg;
1762
1763 while (line) {
1764 const char *eol = strchrnul(line, '\n');
1765
1766 if (line == eol)
1767 return NULL;
1768
1769 if (eol - line > key_len &&
1770 !strncmp(line, key, key_len) &&
1771 line[key_len] == ' ') {
1772 *out_len = eol - line - key_len - 1;
1773 return line + key_len + 1;
1774 }
1775 line = *eol ? eol + 1 : NULL;
1776 }
1777 return NULL;
1778}
0ed8a4e1 1779
8c384589 1780/*
710714aa 1781 * Inspect the given string and determine the true "end" of the log message, in
8c384589 1782 * order to find where to put a new Signed-off-by: line. Ignored are
d76650b8
BM
1783 * trailing comment lines and blank lines. To support "git commit -s
1784 * --amend" on an existing commit, we also ignore "Conflicts:". To
1785 * support "git commit -v", we truncate at cut lines.
8c384589
CC
1786 *
1787 * Returns the number of bytes from the tail to ignore, to be fed as
1788 * the second parameter to append_signoff().
1789 */
710714aa 1790int ignore_non_trailer(const char *buf, size_t len)
8c384589
CC
1791{
1792 int boc = 0;
1793 int bol = 0;
1794 int in_old_conflicts_block = 0;
d76650b8 1795 size_t cutoff = wt_status_locate_end(buf, len);
8c384589 1796
d76650b8 1797 while (bol < cutoff) {
710714aa 1798 const char *next_line = memchr(buf + bol, '\n', len - bol);
8c384589 1799
710714aa
JT
1800 if (!next_line)
1801 next_line = buf + len;
8c384589
CC
1802 else
1803 next_line++;
1804
710714aa 1805 if (buf[bol] == comment_line_char || buf[bol] == '\n') {
8c384589
CC
1806 /* is this the first of the run of comments? */
1807 if (!boc)
1808 boc = bol;
1809 /* otherwise, it is just continuing */
710714aa 1810 } else if (starts_with(buf + bol, "Conflicts:\n")) {
8c384589
CC
1811 in_old_conflicts_block = 1;
1812 if (!boc)
1813 boc = bol;
710714aa 1814 } else if (in_old_conflicts_block && buf[bol] == '\t') {
8c384589
CC
1815 ; /* a pathname in the conflicts block */
1816 } else if (boc) {
1817 /* the previous was not trailing comment */
1818 boc = 0;
1819 in_old_conflicts_block = 0;
1820 }
710714aa 1821 bol = next_line - buf;
8c384589 1822 }
d76650b8 1823 return boc ? len - boc : len - cutoff;
8c384589 1824}