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chromium / external / github.com / git / git / refs/tags/v1.6.1 / . / commit.c
blob: c99db162a48e0a47e73e6bfc2ae5fd4b7c9dfa1a [file] [log] [blame]
Junio C Hamano8f1d2e62006-01-07 09:33:54[diff] [blame]1#include "cache.h"
Linus Torvalds961784e2005-05-18 23:14:22[diff] [blame]2#include "tag.h"
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]3#include "commit.h"
Johannes Schindelined09aef2006-10-30 19:09:06[diff] [blame]4#include "pkt-line.h"
Junio C Hamano52883fb2006-12-25 19:48:35[diff] [blame]5#include "utf8.h"
Junio C Hamano199c45b2007-04-09 09:34:05[diff] [blame]6#include "diff.h"
7#include "revision.h"
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]8
Linus Torvalds60ab26d2005-09-15 21:43:17[diff] [blame]9int save_commit_buffer = 1;
10
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]11const char *commit_type = "commit";
12
Junio C Hamanof76412e2005-08-21 09:51:10[diff] [blame]13static struct commit *check_commit(struct object *obj,
14 const unsigned char *sha1,
15 int quiet)
Linus Torvalds961784e2005-05-18 23:14:22[diff] [blame]16{
Linus Torvalds19746322006-07-12 03:45:31[diff] [blame]17 if (obj->type != OBJ_COMMIT) {
Junio C Hamanof76412e2005-08-21 09:51:10[diff] [blame]18 if (!quiet)
19 error("Object %s is a %s, not a commit",
Linus Torvalds885a86a2006-06-14 23:45:13[diff] [blame]20 sha1_to_hex(sha1), typename(obj->type));
Linus Torvalds961784e2005-05-18 23:14:22[diff] [blame]21 return NULL;
22 }
23 return (struct commit *) obj;
24}
25
Junio C Hamanof76412e2005-08-21 09:51:10[diff] [blame]26struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
27 int quiet)
Linus Torvalds961784e2005-05-18 23:14:22[diff] [blame]28{
Junio C Hamano9534f402005-11-02 23:19:13[diff] [blame]29 struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
Linus Torvalds961784e2005-05-18 23:14:22[diff] [blame]30
31 if (!obj)
32 return NULL;
Junio C Hamanof76412e2005-08-21 09:51:10[diff] [blame]33 return check_commit(obj, sha1, quiet);
34}
35
36struct commit *lookup_commit_reference(const unsigned char *sha1)
37{
38 return lookup_commit_reference_gently(sha1, 0);
Linus Torvalds961784e2005-05-18 23:14:22[diff] [blame]39}
40
Jason McMullan5d6ccf52005-06-03 15:05:39[diff] [blame]41struct commit *lookup_commit(const unsigned char *sha1)
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]42{
43 struct object *obj = lookup_object(sha1);
Linus Torvalds100c5f32007-04-17 05:11:43[diff] [blame]44 if (!obj)
45 return create_object(sha1, OBJ_COMMIT, alloc_commit_node());
Nicolas Pitred1af0022005-05-20 20:59:17[diff] [blame]46 if (!obj->type)
Linus Torvalds19746322006-07-12 03:45:31[diff] [blame]47 obj->type = OBJ_COMMIT;
Junio C Hamanof76412e2005-08-21 09:51:10[diff] [blame]48 return check_commit(obj, sha1, 0);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]49}
50
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]51static unsigned long parse_commit_date(const char *buf, const char *tail)
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]52{
53 unsigned long date;
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]54 const char *dateptr;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]55
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]56 if (buf + 6 >= tail)
57 return 0;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]58 if (memcmp(buf, "author", 6))
59 return 0;
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]60 while (buf < tail && *buf++ != '\n')
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]61 /* nada */;
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]62 if (buf + 9 >= tail)
63 return 0;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]64 if (memcmp(buf, "committer", 9))
65 return 0;
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]66 while (buf < tail && *buf++ != '>')
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]67 /* nada */;
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]68 if (buf >= tail)
69 return 0;
70 dateptr = buf;
71 while (buf < tail && *buf++ != '\n')
72 /* nada */;
73 if (buf >= tail)
74 return 0;
75 /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
76 date = strtoul(dateptr, NULL, 10);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]77 if (date == ULONG_MAX)
78 date = 0;
79 return date;
80}
81
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]82static struct commit_graft **commit_graft;
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]83static int commit_graft_alloc, commit_graft_nr;
84
85static int commit_graft_pos(const unsigned char *sha1)
86{
87 int lo, hi;
88 lo = 0;
89 hi = commit_graft_nr;
90 while (lo < hi) {
91 int mi = (lo + hi) / 2;
92 struct commit_graft *graft = commit_graft[mi];
David Rientjesa89fccd2006-08-17 18:54:57[diff] [blame]93 int cmp = hashcmp(sha1, graft->sha1);
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]94 if (!cmp)
95 return mi;
96 if (cmp < 0)
97 hi = mi;
98 else
99 lo = mi + 1;
100 }
101 return -lo - 1;
102}
103
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]104int register_commit_graft(struct commit_graft *graft, int ignore_dups)
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]105{
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]106 int pos = commit_graft_pos(graft->sha1);
Junio C Hamanoa6080a02007-06-07 07:04:01[diff] [blame]107
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]108 if (0 <= pos) {
109 if (ignore_dups)
110 free(graft);
111 else {
112 free(commit_graft[pos]);
113 commit_graft[pos] = graft;
114 }
115 return 1;
116 }
117 pos = -pos - 1;
118 if (commit_graft_alloc <= ++commit_graft_nr) {
119 commit_graft_alloc = alloc_nr(commit_graft_alloc);
120 commit_graft = xrealloc(commit_graft,
121 sizeof(*commit_graft) *
122 commit_graft_alloc);
123 }
124 if (pos < commit_graft_nr)
125 memmove(commit_graft + pos + 1,
126 commit_graft + pos,
127 (commit_graft_nr - pos - 1) *
128 sizeof(*commit_graft));
129 commit_graft[pos] = graft;
130 return 0;
131}
132
133struct commit_graft *read_graft_line(char *buf, int len)
134{
135 /* The format is just "Commit Parent1 Parent2 ...\n" */
136 int i;
137 struct commit_graft *graft = NULL;
138
139 if (buf[len-1] == '\n')
140 buf[--len] = 0;
Yann Dirson360204c2006-04-17 11:41:49[diff] [blame]141 if (buf[0] == '#' || buf[0] == '\0')
Junio C Hamano5bc4ce52006-04-16 21:24:56[diff] [blame]142 return NULL;
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]143 if ((len + 1) % 41) {
144 bad_graft_data:
145 error("bad graft data: %s", buf);
146 free(graft);
147 return NULL;
148 }
149 i = (len + 1) / 41 - 1;
150 graft = xmalloc(sizeof(*graft) + 20 * i);
151 graft->nr_parent = i;
152 if (get_sha1_hex(buf, graft->sha1))
153 goto bad_graft_data;
154 for (i = 40; i < len; i += 41) {
155 if (buf[i] != ' ')
156 goto bad_graft_data;
157 if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
158 goto bad_graft_data;
159 }
160 return graft;
161}
162
Nanako Shiraishic5ae6432008-10-02 10:14:30[diff] [blame]163static int read_graft_file(const char *graft_file)
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]164{
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]165 FILE *fp = fopen(graft_file, "r");
166 char buf[1024];
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]167 if (!fp)
168 return -1;
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]169 while (fgets(buf, sizeof(buf), fp)) {
170 /* The format is just "Commit Parent1 Parent2 ...\n" */
171 int len = strlen(buf);
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]172 struct commit_graft *graft = read_graft_line(buf, len);
Junio C Hamano5bc4ce52006-04-16 21:24:56[diff] [blame]173 if (!graft)
174 continue;
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]175 if (register_commit_graft(graft, 1))
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]176 error("duplicate graft data: %s", buf);
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]177 }
178 fclose(fp);
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]179 return 0;
180}
181
182static void prepare_commit_graft(void)
183{
184 static int commit_graft_prepared;
185 char *graft_file;
186
187 if (commit_graft_prepared)
188 return;
189 graft_file = get_graft_file();
190 read_graft_file(graft_file);
Johannes Schindelined09aef2006-10-30 19:09:06[diff] [blame]191 /* make sure shallows are read */
192 is_repository_shallow();
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]193 commit_graft_prepared = 1;
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]194}
195
Martin Koegler45163382008-02-25 21:46:07[diff] [blame]196struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]197{
198 int pos;
Junio C Hamano5040f172006-04-07 06:58:51[diff] [blame]199 prepare_commit_graft();
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]200 pos = commit_graft_pos(sha1);
201 if (pos < 0)
202 return NULL;
203 return commit_graft[pos];
204}
205
Johannes Schindelined09aef2006-10-30 19:09:06[diff] [blame]206int write_shallow_commits(int fd, int use_pack_protocol)
207{
208 int i, count = 0;
209 for (i = 0; i < commit_graft_nr; i++)
210 if (commit_graft[i]->nr_parent < 0) {
211 const char *hex =
212 sha1_to_hex(commit_graft[i]->sha1);
213 count++;
214 if (use_pack_protocol)
215 packet_write(fd, "shallow %s", hex);
216 else {
Andy Whitcroft93822c22007-01-08 15:58:23[diff] [blame]217 if (write_in_full(fd, hex, 40) != 40)
218 break;
219 if (write_in_full(fd, "\n", 1) != 1)
220 break;
Johannes Schindelined09aef2006-10-30 19:09:06[diff] [blame]221 }
222 }
223 return count;
224}
225
Johannes Schindelinf53514b2006-10-30 19:09:53[diff] [blame]226int unregister_shallow(const unsigned char *sha1)
227{
228 int pos = commit_graft_pos(sha1);
229 if (pos < 0)
230 return -1;
231 if (pos + 1 < commit_graft_nr)
232 memcpy(commit_graft + pos, commit_graft + pos + 1,
233 sizeof(struct commit_graft *)
234 * (commit_graft_nr - pos - 1));
235 commit_graft_nr--;
236 return 0;
237}
238
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]239int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]240{
Junio C Hamano3b44f152006-06-28 10:51:00[diff] [blame]241 char *tail = buffer;
Linus Torvaldsf7cc77d2005-07-27 22:12:48[diff] [blame]242 char *bufptr = buffer;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]243 unsigned char parent[20];
Linus Torvalds6c88be12005-06-21 03:26:03[diff] [blame]244 struct commit_list **pptr;
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]245 struct commit_graft *graft;
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]246
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]247 if (item->object.parsed)
248 return 0;
249 item->object.parsed = 1;
Junio C Hamano3b44f152006-06-28 10:51:00[diff] [blame]250 tail += size;
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]251 if (tail <= bufptr + 46 || memcmp(bufptr, "tree ", 5) || bufptr[45] != '\n')
Linus Torvaldsf7cc77d2005-07-27 22:12:48[diff] [blame]252 return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]253 if (get_sha1_hex(bufptr + 5, parent) < 0)
Junio C Hamanobd2afde2006-02-23 01:47:10[diff] [blame]254 return error("bad tree pointer in commit %s",
255 sha1_to_hex(item->object.sha1));
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]256 item->tree = lookup_tree(parent);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]257 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
Linus Torvalds6c88be12005-06-21 03:26:03[diff] [blame]258 pptr = &item->parents;
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]259
260 graft = lookup_commit_graft(item->object.sha1);
Junio C Hamano3b44f152006-06-28 10:51:00[diff] [blame]261 while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
Linus Torvaldsf7cc77d2005-07-27 22:12:48[diff] [blame]262 struct commit *new_parent;
263
Junio C Hamano3b44f152006-06-28 10:51:00[diff] [blame]264 if (tail <= bufptr + 48 ||
265 get_sha1_hex(bufptr + 7, parent) ||
266 bufptr[47] != '\n')
Linus Torvaldsf7cc77d2005-07-27 22:12:48[diff] [blame]267 return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]268 bufptr += 48;
269 if (graft)
270 continue;
Linus Torvaldsf7cc77d2005-07-27 22:12:48[diff] [blame]271 new_parent = lookup_commit(parent);
Miklos Vajna39468de2008-06-07 20:38:37[diff] [blame]272 if (new_parent)
Linus Torvalds6c88be12005-06-21 03:26:03[diff] [blame]273 pptr = &commit_list_insert(new_parent, pptr)->next;
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]274 }
275 if (graft) {
276 int i;
277 struct commit *new_parent;
278 for (i = 0; i < graft->nr_parent; i++) {
279 new_parent = lookup_commit(graft->parent[i]);
280 if (!new_parent)
281 continue;
282 pptr = &commit_list_insert(new_parent, pptr)->next;
Junio C Hamano5da5c8f2005-07-30 07:58:28[diff] [blame]283 }
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]284 }
Martin Koegler0a617792008-01-19 17:35:23[diff] [blame]285 item->date = parse_commit_date(bufptr, tail);
Junio C Hamano27dedf02005-11-17 05:32:44[diff] [blame]286
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]287 return 0;
288}
289
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]290int parse_commit(struct commit *item)
291{
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]292 enum object_type type;
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]293 void *buffer;
294 unsigned long size;
295 int ret;
296
Martin Koegler9786f682008-02-18 20:48:02[diff] [blame]297 if (!item)
298 return -1;
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]299 if (item->object.parsed)
300 return 0;
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]301 buffer = read_sha1_file(item->object.sha1, &type, &size);
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]302 if (!buffer)
303 return error("Could not read %s",
304 sha1_to_hex(item->object.sha1));
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]305 if (type != OBJ_COMMIT) {
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]306 free(buffer);
307 return error("Object %s not a commit",
308 sha1_to_hex(item->object.sha1));
309 }
310 ret = parse_commit_buffer(item, buffer, size);
Linus Torvalds60ab26d2005-09-15 21:43:17[diff] [blame]311 if (save_commit_buffer && !ret) {
Linus Torvalds3ff1fbb2005-05-26 01:27:14[diff] [blame]312 item->buffer = buffer;
313 return 0;
314 }
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]315 free(buffer);
316 return ret;
317}
318
Linus Torvaldsac5155e2005-05-31 01:44:02[diff] [blame]319struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]320{
Christopher Li812666c2005-04-26 19:00:58[diff] [blame]321 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]322 new_list->item = item;
323 new_list->next = *list_p;
324 *list_p = new_list;
Linus Torvaldsac5155e2005-05-31 01:44:02[diff] [blame]325 return new_list;
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]326}
327
Miklos Vajna65319472008-06-27 16:21:55[diff] [blame]328unsigned commit_list_count(const struct commit_list *l)
329{
330 unsigned c = 0;
331 for (; l; l = l->next )
332 c++;
333 return c;
334}
335
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]336void free_commit_list(struct commit_list *list)
337{
338 while (list) {
339 struct commit_list *temp = list;
340 list = temp->next;
341 free(temp);
342 }
343}
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]344
Linus Torvaldsf7554942005-07-06 16:31:17[diff] [blame]345struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]346{
347 struct commit_list **pp = list;
348 struct commit_list *p;
349 while ((p = *pp) != NULL) {
350 if (p->item->date < item->date) {
351 break;
352 }
353 pp = &p->next;
354 }
Linus Torvaldsf7554942005-07-06 16:31:17[diff] [blame]355 return commit_list_insert(item, pp);
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]356}
357
Junio C Hamanoa6080a02007-06-07 07:04:01[diff] [blame]358
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]359void sort_by_date(struct commit_list **list)
360{
361 struct commit_list *ret = NULL;
362 while (*list) {
Linus Torvaldsf7554942005-07-06 16:31:17[diff] [blame]363 insert_by_date((*list)->item, &ret);
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]364 *list = (*list)->next;
365 }
366 *list = ret;
367}
368
Daniel Barkalow58e28af2005-04-24 03:29:22[diff] [blame]369struct commit *pop_most_recent_commit(struct commit_list **list,
370 unsigned int mark)
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]371{
372 struct commit *ret = (*list)->item;
373 struct commit_list *parents = ret->parents;
374 struct commit_list *old = *list;
375
376 *list = (*list)->next;
377 free(old);
378
379 while (parents) {
Linus Torvalds4056c092005-04-24 02:21:28[diff] [blame]380 struct commit *commit = parents->item;
Martin Koeglerdec38c82008-02-18 20:48:03[diff] [blame]381 if (!parse_commit(commit) && !(commit->object.flags & mark)) {
Daniel Barkalow58e28af2005-04-24 03:29:22[diff] [blame]382 commit->object.flags |= mark;
Linus Torvaldsf7554942005-07-06 16:31:17[diff] [blame]383 insert_by_date(commit, list);
Linus Torvalds4056c092005-04-24 02:21:28[diff] [blame]384 }
Daniel Barkalowdd97f852005-04-24 01:47:23[diff] [blame]385 parents = parents->next;
386 }
387 return ret;
388}
Linus Torvaldse3bc7a32005-06-01 15:34:23[diff] [blame]389
Junio C Hamanof8f9c732006-01-08 02:52:42[diff] [blame]390void clear_commit_marks(struct commit *commit, unsigned int mark)
391{
Johannes Schindelin60fcc2e2007-10-10 22:14:35[diff] [blame]392 while (commit) {
393 struct commit_list *parents;
Junio C Hamanof8f9c732006-01-08 02:52:42[diff] [blame]394
Johannes Schindelin60fcc2e2007-10-10 22:14:35[diff] [blame]395 if (!(mark & commit->object.flags))
396 return;
Junio C Hamano58ecf5c2006-07-05 00:45:22[diff] [blame]397
Johannes Schindelin60fcc2e2007-10-10 22:14:35[diff] [blame]398 commit->object.flags &= ~mark;
399
400 parents = commit->parents;
401 if (!parents)
402 return;
403
404 while ((parents = parents->next))
405 clear_commit_marks(parents->item, mark);
406
407 commit = commit->parents->item;
Junio C Hamanof8f9c732006-01-08 02:52:42[diff] [blame]408 }
409}
410
jon@blackcubes.dyndns.orga3437b82005-06-06 15:39:40[diff] [blame]411struct commit *pop_commit(struct commit_list **stack)
412{
413 struct commit_list *top = *stack;
414 struct commit *item = top ? top->item : NULL;
415
416 if (top) {
417 *stack = top->next;
418 free(top);
419 }
420 return item;
421}
422
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]423/*
424 * Performs an in-place topological sort on the list supplied.
425 */
Junio C Hamano4c8725f2006-02-16 06:05:33[diff] [blame]426void sort_in_topological_order(struct commit_list ** list, int lifo)
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]427{
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]428 struct commit_list *next, *orig = *list;
429 struct commit_list *work, **insert;
430 struct commit_list **pptr;
Fredrik Kuivinen6b6dcfc2006-03-10 09:21:37[diff] [blame]431
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]432 if (!orig)
Eric Wong7d6fb372005-12-24 12:12:43[diff] [blame]433 return;
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]434 *list = NULL;
435
436 /* Mark them and clear the indegree */
437 for (next = orig; next; next = next->next) {
438 struct commit *commit = next->item;
Johannes Schindeline358f3c2008-07-23 00:51:36[diff] [blame]439 commit->indegree = 1;
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]440 }
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]441
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]442 /* update the indegree */
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]443 for (next = orig; next; next = next->next) {
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]444 struct commit_list * parents = next->item->parents;
445 while (parents) {
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]446 struct commit *parent = parents->item;
Fredrik Kuivinen6b6dcfc2006-03-10 09:21:37[diff] [blame]447
Johannes Schindeline358f3c2008-07-23 00:51:36[diff] [blame]448 if (parent->indegree)
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]449 parent->indegree++;
450 parents = parents->next;
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]451 }
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]452 }
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]453
Junio C Hamanoa6080a02007-06-07 07:04:01[diff] [blame]454 /*
Pierre Habouzit674d1722007-09-10 10:35:06[diff] [blame]455 * find the tips
456 *
457 * tips are nodes not reachable from any other node in the list
458 *
459 * the tips serve as a starting set for the work queue.
460 */
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]461 work = NULL;
Linus Torvalds2ed02882005-11-14 18:01:26[diff] [blame]462 insert = &work;
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]463 for (next = orig; next; next = next->next) {
464 struct commit *commit = next->item;
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]465
Johannes Schindeline358f3c2008-07-23 00:51:36[diff] [blame]466 if (commit->indegree == 1)
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]467 insert = &commit_list_insert(commit, insert)->next;
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]468 }
Junio C Hamano4c8725f2006-02-16 06:05:33[diff] [blame]469
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]470 /* process the list in topological order */
Junio C Hamano4c8725f2006-02-16 06:05:33[diff] [blame]471 if (!lifo)
472 sort_by_date(&work);
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]473
474 pptr = list;
475 *list = NULL;
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]476 while (work) {
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]477 struct commit *commit;
478 struct commit_list *parents, *work_item;
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]479
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]480 work_item = work;
481 work = work_item->next;
482 work_item->next = NULL;
Fredrik Kuivinen6b6dcfc2006-03-10 09:21:37[diff] [blame]483
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]484 commit = work_item->item;
485 for (parents = commit->parents; parents ; parents = parents->next) {
486 struct commit *parent=parents->item;
487
Johannes Schindeline358f3c2008-07-23 00:51:36[diff] [blame]488 if (!parent->indegree)
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]489 continue;
490
491 /*
492 * parents are only enqueued for emission
493 * when all their children have been emitted thereby
494 * guaranteeing topological order.
495 */
Johannes Schindeline358f3c2008-07-23 00:51:36[diff] [blame]496 if (--parent->indegree == 1) {
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]497 if (!lifo)
498 insert_by_date(parent, &work);
499 else
500 commit_list_insert(parent, &work);
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]501 }
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]502 }
503 /*
Pierre Habouzit674d1722007-09-10 10:35:06[diff] [blame]504 * work_item is a commit all of whose children
505 * have already been emitted. we can emit it now.
506 */
Johannes Schindeline358f3c2008-07-23 00:51:36[diff] [blame]507 commit->indegree = 0;
Linus Torvalds23c17d42007-11-02 20:32:58[diff] [blame]508 *pptr = work_item;
509 pptr = &work_item->next;
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]510 }
Jon Seymourab580ac2005-07-06 16:39:34[diff] [blame]511}
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]512
Junio C Hamano12952282007-01-09 07:10:49[diff] [blame]513/* merge-base stuff */
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]514
Junio C Hamano577ed5c2006-10-23 00:32:47[diff] [blame]515/* bits #0..15 in revision.h */
516#define PARENT1 (1u<<16)
517#define PARENT2 (1u<<17)
518#define STALE (1u<<18)
519#define RESULT (1u<<19)
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]520
Junio C Hamano12952282007-01-09 07:10:49[diff] [blame]521static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
522
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]523static struct commit *interesting(struct commit_list *list)
524{
525 while (list) {
526 struct commit *commit = list->item;
527 list = list->next;
Junio C Hamano542ccef2006-07-02 18:34:17[diff] [blame]528 if (commit->object.flags & STALE)
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]529 continue;
530 return commit;
531 }
532 return NULL;
533}
534
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]535static struct commit_list *merge_bases_many(struct commit *one, int n, struct commit **twos)
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]536{
537 struct commit_list *list = NULL;
538 struct commit_list *result = NULL;
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]539 int i;
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]540
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]541 for (i = 0; i < n; i++) {
542 if (one == twos[i])
543 /*
544 * We do not mark this even with RESULT so we do not
545 * have to clean it up.
546 */
547 return commit_list_insert(one, &result);
548 }
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]549
Martin Koegler172947e2008-02-18 20:47:57[diff] [blame]550 if (parse_commit(one))
551 return NULL;
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]552 for (i = 0; i < n; i++) {
553 if (parse_commit(twos[i]))
554 return NULL;
555 }
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]556
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]557 one->object.flags |= PARENT1;
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]558 insert_by_date(one, &list);
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]559 for (i = 0; i < n; i++) {
560 twos[i]->object.flags |= PARENT2;
561 insert_by_date(twos[i], &list);
562 }
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]563
564 while (interesting(list)) {
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]565 struct commit *commit;
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]566 struct commit_list *parents;
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]567 struct commit_list *n;
568 int flags;
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]569
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]570 commit = list->item;
571 n = list->next;
572 free(list);
573 list = n;
574
575 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]576 if (flags == (PARENT1 | PARENT2)) {
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]577 if (!(commit->object.flags & RESULT)) {
578 commit->object.flags |= RESULT;
579 insert_by_date(commit, &result);
580 }
Junio C Hamano542ccef2006-07-02 18:34:17[diff] [blame]581 /* Mark parents of a found merge stale */
582 flags |= STALE;
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]583 }
584 parents = commit->parents;
585 while (parents) {
586 struct commit *p = parents->item;
587 parents = parents->next;
588 if ((p->object.flags & flags) == flags)
589 continue;
Martin Koegler172947e2008-02-18 20:47:57[diff] [blame]590 if (parse_commit(p))
591 return NULL;
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]592 p->object.flags |= flags;
593 insert_by_date(p, &list);
594 }
595 }
596
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]597 /* Clean up the result to remove stale ones */
Junio C Hamano12952282007-01-09 07:10:49[diff] [blame]598 free_commit_list(list);
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]599 list = result; result = NULL;
600 while (list) {
601 struct commit_list *n = list->next;
602 if (!(list->item->object.flags & STALE))
603 insert_by_date(list->item, &result);
604 free(list);
605 list = n;
606 }
607 return result;
608}
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]609
Miklos Vajna5240c9d2008-06-27 16:22:00[diff] [blame]610struct commit_list *get_octopus_merge_bases(struct commit_list *in)
611{
612 struct commit_list *i, *j, *k, *ret = NULL;
613 struct commit_list **pptr = &ret;
614
615 for (i = in; i; i = i->next) {
616 if (!ret)
617 pptr = &commit_list_insert(i->item, pptr)->next;
618 else {
619 struct commit_list *new = NULL, *end = NULL;
620
621 for (j = ret; j; j = j->next) {
622 struct commit_list *bases;
623 bases = get_merge_bases(i->item, j->item, 1);
624 if (!new)
625 new = bases;
626 else
627 end->next = bases;
628 for (k = bases; k; k = k->next)
629 end = k;
630 }
631 ret = new;
632 }
633 }
634 return ret;
635}
636
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]637struct commit_list *get_merge_bases_many(struct commit *one,
638 int n,
639 struct commit **twos,
640 int cleanup)
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]641{
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]642 struct commit_list *list;
643 struct commit **rslt;
644 struct commit_list *result;
645 int cnt, i, j;
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]646
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]647 result = merge_bases_many(one, n, twos);
648 for (i = 0; i < n; i++) {
649 if (one == twos[i])
650 return result;
651 }
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]652 if (!result || !result->next) {
653 if (cleanup) {
654 clear_commit_marks(one, all_flags);
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]655 for (i = 0; i < n; i++)
656 clear_commit_marks(twos[i], all_flags);
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]657 }
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]658 return result;
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]659 }
660
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]661 /* There are more than one */
662 cnt = 0;
663 list = result;
664 while (list) {
665 list = list->next;
666 cnt++;
667 }
668 rslt = xcalloc(cnt, sizeof(*rslt));
669 for (list = result, i = 0; list; list = list->next)
670 rslt[i++] = list->item;
671 free_commit_list(result);
672
673 clear_commit_marks(one, all_flags);
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]674 for (i = 0; i < n; i++)
675 clear_commit_marks(twos[i], all_flags);
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]676 for (i = 0; i < cnt - 1; i++) {
677 for (j = i+1; j < cnt; j++) {
678 if (!rslt[i] || !rslt[j])
679 continue;
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]680 result = merge_bases_many(rslt[i], 1, &rslt[j]);
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]681 clear_commit_marks(rslt[i], all_flags);
682 clear_commit_marks(rslt[j], all_flags);
683 for (list = result; list; list = list->next) {
684 if (rslt[i] == list->item)
685 rslt[i] = NULL;
686 if (rslt[j] == list->item)
687 rslt[j] = NULL;
688 }
689 }
Junio C Hamano58ecf5c2006-07-05 00:45:22[diff] [blame]690 }
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]691
Junio C Hamanof3249432006-07-05 01:46:42[diff] [blame]692 /* Surviving ones in rslt[] are the independent results */
693 result = NULL;
694 for (i = 0; i < cnt; i++) {
695 if (rslt[i])
696 insert_by_date(rslt[i], &result);
697 }
698 free(rslt);
Johannes Schindelin7c6f8aa2006-06-29 13:17:32[diff] [blame]699 return result;
700}
Junio C Hamano2ecd2bb2006-12-19 08:14:04[diff] [blame]701
Junio C Hamano6a938642008-06-27 16:22:02[diff] [blame]702struct commit_list *get_merge_bases(struct commit *one, struct commit *two,
703 int cleanup)
704{
705 return get_merge_bases_many(one, 1, &two, cleanup);
706}
707
Junio C Hamano03840fc2007-01-09 07:22:31[diff] [blame]708int in_merge_bases(struct commit *commit, struct commit **reference, int num)
Junio C Hamano2ecd2bb2006-12-19 08:14:04[diff] [blame]709{
710 struct commit_list *bases, *b;
711 int ret = 0;
712
Junio C Hamano03840fc2007-01-09 07:22:31[diff] [blame]713 if (num == 1)
714 bases = get_merge_bases(commit, *reference, 1);
715 else
716 die("not yet");
Junio C Hamano2ecd2bb2006-12-19 08:14:04[diff] [blame]717 for (b = bases; b; b = b->next) {
Junio C Hamano03840fc2007-01-09 07:22:31[diff] [blame]718 if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
Junio C Hamano2ecd2bb2006-12-19 08:14:04[diff] [blame]719 ret = 1;
720 break;
721 }
722 }
723
724 free_commit_list(bases);
725 return ret;
726}
Junio C Hamano98cf9c32008-06-27 16:22:03[diff] [blame]727
728struct commit_list *reduce_heads(struct commit_list *heads)
729{
730 struct commit_list *p;
731 struct commit_list *result = NULL, **tail = &result;
732 struct commit **other;
733 size_t num_head, num_other;
734
735 if (!heads)
736 return NULL;
737
738 /* Avoid unnecessary reallocations */
739 for (p = heads, num_head = 0; p; p = p->next)
740 num_head++;
741 other = xcalloc(sizeof(*other), num_head);
742
743 /* For each commit, see if it can be reached by others */
744 for (p = heads; p; p = p->next) {
745 struct commit_list *q, *base;
746
Junio C Hamano711f6b22008-07-14 07:09:41[diff] [blame]747 /* Do we already have this in the result? */
748 for (q = result; q; q = q->next)
749 if (p->item == q->item)
750 break;
751 if (q)
752 continue;
753
Junio C Hamano98cf9c32008-06-27 16:22:03[diff] [blame]754 num_other = 0;
755 for (q = heads; q; q = q->next) {
Sverre Hvammen Johansen3d1dd472008-07-13 08:13:55[diff] [blame]756 if (p->item == q->item)
Junio C Hamano98cf9c32008-06-27 16:22:03[diff] [blame]757 continue;
758 other[num_other++] = q->item;
759 }
Junio C Hamano711f6b22008-07-14 07:09:41[diff] [blame]760 if (num_other)
Junio C Hamano98cf9c32008-06-27 16:22:03[diff] [blame]761 base = get_merge_bases_many(p->item, num_other, other, 1);
Junio C Hamano711f6b22008-07-14 07:09:41[diff] [blame]762 else
Junio C Hamano98cf9c32008-06-27 16:22:03[diff] [blame]763 base = NULL;
764 /*
765 * If p->item does not have anything common with other
766 * commits, there won't be any merge base. If it is
767 * reachable from some of the others, p->item will be
768 * the merge base. If its history is connected with
769 * others, but p->item is not reachable by others, we
770 * will get something other than p->item back.
771 */
772 if (!base || (base->item != p->item))
773 tail = &(commit_list_insert(p->item, tail)->next);
774 free_commit_list(base);
775 }
776 free(other);
777 return result;
778}