grep.c: remove implicit dependency on the_index
[git/git.git] / notes-merge.c
CommitLineData
75ef3f4a
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1#include "cache.h"
2#include "commit.h"
3#include "refs.h"
cbd53a21 4#include "object-store.h"
2122f675 5#include "repository.h"
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6#include "diff.h"
7#include "diffcore.h"
809f38c8
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8#include "xdiff-interface.h"
9#include "ll-merge.h"
10#include "dir.h"
56881843 11#include "notes.h"
75ef3f4a 12#include "notes-merge.h"
443259cf 13#include "strbuf.h"
bf9a05ba 14#include "notes-utils.h"
75ef3f4a 15
2085b16a 16struct notes_merge_pair {
e910bb1e 17 struct object_id obj, base, local, remote;
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18};
19
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20void init_notes_merge_options(struct notes_merge_options *o)
21{
22 memset(o, 0, sizeof(struct notes_merge_options));
443259cf 23 strbuf_init(&(o->commit_msg), 0);
75ef3f4a
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24 o->verbosity = NOTES_MERGE_VERBOSITY_DEFAULT;
25}
26
4d77896e 27static int path_to_oid(const char *path, struct object_id *oid)
2085b16a 28{
4d77896e 29 char hex_oid[GIT_SHA1_HEXSZ];
2085b16a 30 int i = 0;
4d77896e 31 while (*path && i < GIT_SHA1_HEXSZ) {
2085b16a 32 if (*path != '/')
4d77896e 33 hex_oid[i++] = *path;
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34 path++;
35 }
4d77896e 36 if (*path || i != GIT_SHA1_HEXSZ)
2085b16a 37 return -1;
4d77896e 38 return get_oid_hex(hex_oid, oid);
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39}
40
4d77896e 41static int verify_notes_filepair(struct diff_filepair *p, struct object_id *oid)
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42{
43 switch (p->status) {
44 case DIFF_STATUS_MODIFIED:
45 assert(p->one->mode == p->two->mode);
a0d12c44 46 assert(!is_null_oid(&p->one->oid));
47 assert(!is_null_oid(&p->two->oid));
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48 break;
49 case DIFF_STATUS_ADDED:
a0d12c44 50 assert(is_null_oid(&p->one->oid));
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51 break;
52 case DIFF_STATUS_DELETED:
a0d12c44 53 assert(is_null_oid(&p->two->oid));
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54 break;
55 default:
56 return -1;
57 }
58 assert(!strcmp(p->one->path, p->two->path));
4d77896e 59 return path_to_oid(p->one->path, oid);
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60}
61
62static struct notes_merge_pair *find_notes_merge_pair_pos(
d7a7c708 63 struct notes_merge_pair *list, int len, struct object_id *obj,
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64 int insert_new, int *occupied)
65{
66 /*
67 * Both diff_tree_remote() and diff_tree_local() tend to process
68 * merge_pairs in ascending order. Therefore, cache last returned
69 * index, and search sequentially from there until the appropriate
70 * position is found.
71 *
72 * Since inserts only happen from diff_tree_remote() (which mainly
73 * _appends_), we don't care that inserting into the middle of the
74 * list is expensive (using memmove()).
75 */
76 static int last_index;
77 int i = last_index < len ? last_index : len - 1;
78 int prev_cmp = 0, cmp = -1;
79 while (i >= 0 && i < len) {
d7a7c708 80 cmp = oidcmp(obj, &list[i].obj);
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81 if (!cmp) /* obj belongs @ i */
82 break;
83 else if (cmp < 0 && prev_cmp <= 0) /* obj belongs < i */
84 i--;
85 else if (cmp < 0) /* obj belongs between i-1 and i */
86 break;
87 else if (cmp > 0 && prev_cmp >= 0) /* obj belongs > i */
88 i++;
89 else /* if (cmp > 0) */ { /* obj belongs between i and i+1 */
90 i++;
91 break;
92 }
93 prev_cmp = cmp;
94 }
95 if (i < 0)
96 i = 0;
97 /* obj belongs at, or immediately preceding, index i (0 <= i <= len) */
98
99 if (!cmp)
100 *occupied = 1;
101 else {
102 *occupied = 0;
103 if (insert_new && i < len) {
f331ab9d 104 MOVE_ARRAY(list + i + 1, list + i, len - i);
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105 memset(list + i, 0, sizeof(struct notes_merge_pair));
106 }
107 }
108 last_index = i;
109 return list + i;
110}
111
e910bb1e 112static struct object_id uninitialized = {
2085b16a 113 "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" \
e910bb1e 114 "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
115};
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116
117static struct notes_merge_pair *diff_tree_remote(struct notes_merge_options *o,
9d6babb2
BW
118 const struct object_id *base,
119 const struct object_id *remote,
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120 int *num_changes)
121{
122 struct diff_options opt;
123 struct notes_merge_pair *changes;
124 int i, len = 0;
125
126 trace_printf("\tdiff_tree_remote(base = %.7s, remote = %.7s)\n",
9d6babb2 127 oid_to_hex(base), oid_to_hex(remote));
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128
129 diff_setup(&opt);
0d1e0e78 130 opt.flags.recursive = 1;
2085b16a 131 opt.output_format = DIFF_FORMAT_NO_OUTPUT;
28452655 132 diff_setup_done(&opt);
66f414f8 133 diff_tree_oid(base, remote, "", &opt);
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134 diffcore_std(&opt);
135
136 changes = xcalloc(diff_queued_diff.nr, sizeof(struct notes_merge_pair));
137
138 for (i = 0; i < diff_queued_diff.nr; i++) {
139 struct diff_filepair *p = diff_queued_diff.queue[i];
140 struct notes_merge_pair *mp;
141 int occupied;
d7a7c708 142 struct object_id obj;
2085b16a 143
4d77896e 144 if (verify_notes_filepair(p, &obj)) {
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145 trace_printf("\t\tCannot merge entry '%s' (%c): "
146 "%.7s -> %.7s. Skipping!\n", p->one->path,
a0d12c44 147 p->status, oid_to_hex(&p->one->oid),
148 oid_to_hex(&p->two->oid));
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149 continue;
150 }
d7a7c708 151 mp = find_notes_merge_pair_pos(changes, len, &obj, 1, &occupied);
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152 if (occupied) {
153 /* We've found an addition/deletion pair */
d7a7c708 154 assert(!oidcmp(&mp->obj, &obj));
a0d12c44 155 if (is_null_oid(&p->one->oid)) { /* addition */
e910bb1e 156 assert(is_null_oid(&mp->remote));
157 oidcpy(&mp->remote, &p->two->oid);
a0d12c44 158 } else if (is_null_oid(&p->two->oid)) { /* deletion */
e910bb1e 159 assert(is_null_oid(&mp->base));
160 oidcpy(&mp->base, &p->one->oid);
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161 } else
162 assert(!"Invalid existing change recorded");
163 } else {
d7a7c708 164 oidcpy(&mp->obj, &obj);
e910bb1e 165 oidcpy(&mp->base, &p->one->oid);
166 oidcpy(&mp->local, &uninitialized);
167 oidcpy(&mp->remote, &p->two->oid);
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168 len++;
169 }
170 trace_printf("\t\tStored remote change for %s: %.7s -> %.7s\n",
e910bb1e 171 oid_to_hex(&mp->obj), oid_to_hex(&mp->base),
172 oid_to_hex(&mp->remote));
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173 }
174 diff_flush(&opt);
ed6e8038 175 clear_pathspec(&opt.pathspec);
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176
177 *num_changes = len;
178 return changes;
179}
180
181static void diff_tree_local(struct notes_merge_options *o,
182 struct notes_merge_pair *changes, int len,
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BW
183 const struct object_id *base,
184 const struct object_id *local)
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185{
186 struct diff_options opt;
187 int i;
188
189 trace_printf("\tdiff_tree_local(len = %i, base = %.7s, local = %.7s)\n",
9d6babb2 190 len, oid_to_hex(base), oid_to_hex(local));
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191
192 diff_setup(&opt);
0d1e0e78 193 opt.flags.recursive = 1;
2085b16a 194 opt.output_format = DIFF_FORMAT_NO_OUTPUT;
28452655 195 diff_setup_done(&opt);
66f414f8 196 diff_tree_oid(base, local, "", &opt);
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197 diffcore_std(&opt);
198
199 for (i = 0; i < diff_queued_diff.nr; i++) {
200 struct diff_filepair *p = diff_queued_diff.queue[i];
201 struct notes_merge_pair *mp;
202 int match;
d7a7c708 203 struct object_id obj;
2085b16a 204
4d77896e 205 if (verify_notes_filepair(p, &obj)) {
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206 trace_printf("\t\tCannot merge entry '%s' (%c): "
207 "%.7s -> %.7s. Skipping!\n", p->one->path,
a0d12c44 208 p->status, oid_to_hex(&p->one->oid),
209 oid_to_hex(&p->two->oid));
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210 continue;
211 }
d7a7c708 212 mp = find_notes_merge_pair_pos(changes, len, &obj, 0, &match);
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213 if (!match) {
214 trace_printf("\t\tIgnoring local-only change for %s: "
d7a7c708 215 "%.7s -> %.7s\n", oid_to_hex(&obj),
a0d12c44 216 oid_to_hex(&p->one->oid),
217 oid_to_hex(&p->two->oid));
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218 continue;
219 }
220
d7a7c708 221 assert(!oidcmp(&mp->obj, &obj));
a0d12c44 222 if (is_null_oid(&p->two->oid)) { /* deletion */
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223 /*
224 * Either this is a true deletion (1), or it is part
225 * of an A/D pair (2), or D/A pair (3):
226 *
227 * (1) mp->local is uninitialized; set it to null_sha1
228 * (2) mp->local is not uninitialized; don't touch it
229 * (3) mp->local is uninitialized; set it to null_sha1
230 * (will be overwritten by following addition)
231 */
e910bb1e 232 if (!oidcmp(&mp->local, &uninitialized))
233 oidclr(&mp->local);
a0d12c44 234 } else if (is_null_oid(&p->one->oid)) { /* addition */
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235 /*
236 * Either this is a true addition (1), or it is part
237 * of an A/D pair (2), or D/A pair (3):
238 *
239 * (1) mp->local is uninitialized; set to p->two->sha1
240 * (2) mp->local is uninitialized; set to p->two->sha1
241 * (3) mp->local is null_sha1; set to p->two->sha1
242 */
e910bb1e 243 assert(is_null_oid(&mp->local) ||
244 !oidcmp(&mp->local, &uninitialized));
245 oidcpy(&mp->local, &p->two->oid);
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246 } else { /* modification */
247 /*
248 * This is a true modification. p->one->sha1 shall
249 * match mp->base, and mp->local shall be uninitialized.
250 * Set mp->local to p->two->sha1.
251 */
e910bb1e 252 assert(!oidcmp(&p->one->oid, &mp->base));
253 assert(!oidcmp(&mp->local, &uninitialized));
254 oidcpy(&mp->local, &p->two->oid);
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255 }
256 trace_printf("\t\tStored local change for %s: %.7s -> %.7s\n",
e910bb1e 257 oid_to_hex(&mp->obj), oid_to_hex(&mp->base),
258 oid_to_hex(&mp->local));
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259 }
260 diff_flush(&opt);
ed6e8038 261 clear_pathspec(&opt.pathspec);
2085b16a
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262}
263
809f38c8
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264static void check_notes_merge_worktree(struct notes_merge_options *o)
265{
266 if (!o->has_worktree) {
267 /*
268 * Must establish NOTES_MERGE_WORKTREE.
269 * Abort if NOTES_MERGE_WORKTREE already exists
270 */
dabba590
JH
271 if (file_exists(git_path(NOTES_MERGE_WORKTREE)) &&
272 !is_empty_dir(git_path(NOTES_MERGE_WORKTREE))) {
809f38c8 273 if (advice_resolve_conflict)
c041c6d0 274 die(_("You have not concluded your previous "
809f38c8
JH
275 "notes merge (%s exists).\nPlease, use "
276 "'git notes merge --commit' or 'git notes "
6abb3655 277 "merge --abort' to commit/abort the "
809f38c8 278 "previous merge before you start a new "
c041c6d0 279 "notes merge."), git_path("NOTES_MERGE_*"));
809f38c8 280 else
c041c6d0
VA
281 die(_("You have not concluded your notes merge "
282 "(%s exists)."), git_path("NOTES_MERGE_*"));
809f38c8
JH
283 }
284
dcf69262 285 if (safe_create_leading_directories_const(git_path(
809f38c8
JH
286 NOTES_MERGE_WORKTREE "/.test")))
287 die_errno("unable to create directory %s",
288 git_path(NOTES_MERGE_WORKTREE));
289 o->has_worktree = 1;
290 } else if (!file_exists(git_path(NOTES_MERGE_WORKTREE)))
291 /* NOTES_MERGE_WORKTREE should already be established */
292 die("missing '%s'. This should not happen",
293 git_path(NOTES_MERGE_WORKTREE));
294}
295
9e5e0c28 296static void write_buf_to_worktree(const struct object_id *obj,
809f38c8
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297 const char *buf, unsigned long size)
298{
299 int fd;
9e5e0c28 300 char *path = git_pathdup(NOTES_MERGE_WORKTREE "/%s", oid_to_hex(obj));
dcf69262 301 if (safe_create_leading_directories_const(path))
809f38c8 302 die_errno("unable to create directory for '%s'", path);
809f38c8 303
deb9c157 304 fd = xopen(path, O_WRONLY | O_EXCL | O_CREAT, 0666);
809f38c8
JH
305
306 while (size > 0) {
634eb82b 307 ssize_t ret = write_in_full(fd, buf, size);
809f38c8
JH
308 if (ret < 0) {
309 /* Ignore epipe */
310 if (errno == EPIPE)
311 break;
312 die_errno("notes-merge");
809f38c8
JH
313 }
314 size -= ret;
315 buf += ret;
316 }
317
318 close(fd);
fcd12db6 319 free(path);
809f38c8
JH
320}
321
9e5e0c28
BW
322static void write_note_to_worktree(const struct object_id *obj,
323 const struct object_id *note)
809f38c8
JH
324{
325 enum object_type type;
326 unsigned long size;
b4f5aca4 327 void *buf = read_object_file(note, &type, &size);
809f38c8
JH
328
329 if (!buf)
330 die("cannot read note %s for object %s",
9e5e0c28 331 oid_to_hex(note), oid_to_hex(obj));
809f38c8
JH
332 if (type != OBJ_BLOB)
333 die("blob expected in note %s for object %s",
9e5e0c28 334 oid_to_hex(note), oid_to_hex(obj));
809f38c8
JH
335 write_buf_to_worktree(obj, buf, size);
336 free(buf);
337}
338
339static int ll_merge_in_worktree(struct notes_merge_options *o,
340 struct notes_merge_pair *p)
341{
342 mmbuffer_t result_buf;
343 mmfile_t base, local, remote;
344 int status;
345
d449347d 346 read_mmblob(&base, &p->base);
347 read_mmblob(&local, &p->local);
348 read_mmblob(&remote, &p->remote);
809f38c8 349
e910bb1e 350 status = ll_merge(&result_buf, oid_to_hex(&p->obj), &base, NULL,
c2e86add 351 &local, o->local_ref, &remote, o->remote_ref, NULL);
809f38c8
JH
352
353 free(base.ptr);
354 free(local.ptr);
355 free(remote.ptr);
356
357 if ((status < 0) || !result_buf.ptr)
358 die("Failed to execute internal merge");
359
9e5e0c28 360 write_buf_to_worktree(&p->obj, result_buf.ptr, result_buf.size);
809f38c8
JH
361 free(result_buf.ptr);
362
363 return status;
364}
365
366static int merge_one_change_manual(struct notes_merge_options *o,
367 struct notes_merge_pair *p,
368 struct notes_tree *t)
369{
370 const char *lref = o->local_ref ? o->local_ref : "local version";
371 const char *rref = o->remote_ref ? o->remote_ref : "remote version";
372
373 trace_printf("\t\t\tmerge_one_change_manual(obj = %.7s, base = %.7s, "
374 "local = %.7s, remote = %.7s)\n",
e910bb1e 375 oid_to_hex(&p->obj), oid_to_hex(&p->base),
376 oid_to_hex(&p->local), oid_to_hex(&p->remote));
809f38c8 377
443259cf
JH
378 /* add "Conflicts:" section to commit message first time through */
379 if (!o->has_worktree)
380 strbuf_addstr(&(o->commit_msg), "\n\nConflicts:\n");
381
e910bb1e 382 strbuf_addf(&(o->commit_msg), "\t%s\n", oid_to_hex(&p->obj));
443259cf 383
5f9f8d15 384 if (o->verbosity >= 2)
e910bb1e 385 printf("Auto-merging notes for %s\n", oid_to_hex(&p->obj));
809f38c8 386 check_notes_merge_worktree(o);
e910bb1e 387 if (is_null_oid(&p->local)) {
809f38c8 388 /* D/F conflict, checkout p->remote */
e910bb1e 389 assert(!is_null_oid(&p->remote));
5f9f8d15
JN
390 if (o->verbosity >= 1)
391 printf("CONFLICT (delete/modify): Notes for object %s "
392 "deleted in %s and modified in %s. Version from %s "
393 "left in tree.\n",
e910bb1e 394 oid_to_hex(&p->obj), lref, rref, rref);
9e5e0c28 395 write_note_to_worktree(&p->obj, &p->remote);
e910bb1e 396 } else if (is_null_oid(&p->remote)) {
809f38c8 397 /* D/F conflict, checkout p->local */
e910bb1e 398 assert(!is_null_oid(&p->local));
5f9f8d15
JN
399 if (o->verbosity >= 1)
400 printf("CONFLICT (delete/modify): Notes for object %s "
401 "deleted in %s and modified in %s. Version from %s "
402 "left in tree.\n",
e910bb1e 403 oid_to_hex(&p->obj), rref, lref, lref);
9e5e0c28 404 write_note_to_worktree(&p->obj, &p->local);
809f38c8
JH
405 } else {
406 /* "regular" conflict, checkout result of ll_merge() */
407 const char *reason = "content";
e910bb1e 408 if (is_null_oid(&p->base))
809f38c8 409 reason = "add/add";
e910bb1e 410 assert(!is_null_oid(&p->local));
411 assert(!is_null_oid(&p->remote));
5f9f8d15
JN
412 if (o->verbosity >= 1)
413 printf("CONFLICT (%s): Merge conflict in notes for "
e910bb1e 414 "object %s\n", reason,
415 oid_to_hex(&p->obj));
809f38c8
JH
416 ll_merge_in_worktree(o, p);
417 }
418
419 trace_printf("\t\t\tremoving from partial merge result\n");
e910bb1e 420 remove_note(t, p->obj.hash);
809f38c8
JH
421
422 return 1;
423}
424
3228e671
JH
425static int merge_one_change(struct notes_merge_options *o,
426 struct notes_merge_pair *p, struct notes_tree *t)
427{
428 /*
809f38c8
JH
429 * Return 0 if change is successfully resolved (stored in notes_tree).
430 * Return 1 is change results in a conflict (NOT stored in notes_tree,
431 * but instead written to NOTES_MERGE_WORKTREE with conflict markers).
3228e671
JH
432 */
433 switch (o->strategy) {
434 case NOTES_MERGE_RESOLVE_MANUAL:
809f38c8 435 return merge_one_change_manual(o, p, t);
3228e671 436 case NOTES_MERGE_RESOLVE_OURS:
5f9f8d15
JN
437 if (o->verbosity >= 2)
438 printf("Using local notes for %s\n",
e910bb1e 439 oid_to_hex(&p->obj));
3228e671
JH
440 /* nothing to do */
441 return 0;
442 case NOTES_MERGE_RESOLVE_THEIRS:
5f9f8d15
JN
443 if (o->verbosity >= 2)
444 printf("Using remote notes for %s\n",
e910bb1e 445 oid_to_hex(&p->obj));
5ee8a954 446 if (add_note(t, &p->obj, &p->remote, combine_notes_overwrite))
033abf97 447 BUG("combine_notes_overwrite failed");
3228e671
JH
448 return 0;
449 case NOTES_MERGE_RESOLVE_UNION:
5f9f8d15
JN
450 if (o->verbosity >= 2)
451 printf("Concatenating local and remote notes for %s\n",
e910bb1e 452 oid_to_hex(&p->obj));
5ee8a954 453 if (add_note(t, &p->obj, &p->remote, combine_notes_concatenate))
3228e671
JH
454 die("failed to concatenate notes "
455 "(combine_notes_concatenate)");
456 return 0;
a6a09095 457 case NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ:
5f9f8d15
JN
458 if (o->verbosity >= 2)
459 printf("Concatenating unique lines in local and remote "
e910bb1e 460 "notes for %s\n", oid_to_hex(&p->obj));
5ee8a954 461 if (add_note(t, &p->obj, &p->remote, combine_notes_cat_sort_uniq))
a6a09095
JH
462 die("failed to concatenate notes "
463 "(combine_notes_cat_sort_uniq)");
464 return 0;
3228e671
JH
465 }
466 die("Unknown strategy (%i).", o->strategy);
467}
468
2085b16a
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469static int merge_changes(struct notes_merge_options *o,
470 struct notes_merge_pair *changes, int *num_changes,
471 struct notes_tree *t)
472{
473 int i, conflicts = 0;
474
475 trace_printf("\tmerge_changes(num_changes = %i)\n", *num_changes);
476 for (i = 0; i < *num_changes; i++) {
477 struct notes_merge_pair *p = changes + i;
478 trace_printf("\t\t%.7s: %.7s -> %.7s/%.7s\n",
e910bb1e 479 oid_to_hex(&p->obj), oid_to_hex(&p->base),
480 oid_to_hex(&p->local),
481 oid_to_hex(&p->remote));
2085b16a 482
e910bb1e 483 if (!oidcmp(&p->base, &p->remote)) {
2085b16a
JH
484 /* no remote change; nothing to do */
485 trace_printf("\t\t\tskipping (no remote change)\n");
e910bb1e 486 } else if (!oidcmp(&p->local, &p->remote)) {
2085b16a
JH
487 /* same change in local and remote; nothing to do */
488 trace_printf("\t\t\tskipping (local == remote)\n");
e910bb1e 489 } else if (!oidcmp(&p->local, &uninitialized) ||
490 !oidcmp(&p->local, &p->base)) {
2085b16a
JH
491 /* no local change; adopt remote change */
492 trace_printf("\t\t\tno local change, adopted remote\n");
5ee8a954 493 if (add_note(t, &p->obj, &p->remote,
2085b16a 494 combine_notes_overwrite))
033abf97 495 BUG("combine_notes_overwrite failed");
2085b16a
JH
496 } else {
497 /* need file-level merge between local and remote */
498 trace_printf("\t\t\tneed content-level merge\n");
3228e671 499 conflicts += merge_one_change(o, p, t);
2085b16a
JH
500 }
501 }
502
503 return conflicts;
504}
505
506static int merge_from_diffs(struct notes_merge_options *o,
9d6babb2
BW
507 const struct object_id *base,
508 const struct object_id *local,
509 const struct object_id *remote,
510 struct notes_tree *t)
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JH
511{
512 struct notes_merge_pair *changes;
513 int num_changes, conflicts;
514
515 trace_printf("\tmerge_from_diffs(base = %.7s, local = %.7s, "
9d6babb2
BW
516 "remote = %.7s)\n", oid_to_hex(base), oid_to_hex(local),
517 oid_to_hex(remote));
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JH
518
519 changes = diff_tree_remote(o, base, remote, &num_changes);
520 diff_tree_local(o, changes, num_changes, base, local);
521
522 conflicts = merge_changes(o, changes, &num_changes, t);
523 free(changes);
524
5f9f8d15 525 if (o->verbosity >= 4)
2ca0c53b
NTND
526 printf(t->dirty ?
527 "Merge result: %i unmerged notes and a dirty notes tree\n" :
528 "Merge result: %i unmerged notes and a clean notes tree\n",
529 conflicts);
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JH
530
531 return conflicts ? -1 : 1;
532}
533
75ef3f4a 534int notes_merge(struct notes_merge_options *o,
2085b16a 535 struct notes_tree *local_tree,
5237e0eb 536 struct object_id *result_oid)
75ef3f4a 537{
1e43ed98 538 struct object_id local_oid, remote_oid;
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JH
539 struct commit *local, *remote;
540 struct commit_list *bases = NULL;
5237e0eb 541 const struct object_id *base_oid, *base_tree_oid;
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JH
542 int result = 0;
543
544 assert(o->local_ref && o->remote_ref);
2085b16a 545 assert(!strcmp(o->local_ref, local_tree->ref));
5237e0eb 546 oidclr(result_oid);
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JH
547
548 trace_printf("notes_merge(o->local_ref = %s, o->remote_ref = %s)\n",
549 o->local_ref, o->remote_ref);
550
551 /* Dereference o->local_ref into local_sha1 */
34c290a6 552 if (read_ref_full(o->local_ref, 0, &local_oid, NULL))
75ef3f4a 553 die("Failed to resolve local notes ref '%s'", o->local_ref);
8d9c5010 554 else if (!check_refname_format(o->local_ref, 0) &&
1e43ed98 555 is_null_oid(&local_oid))
5237e0eb 556 local = NULL; /* local_oid == null_oid indicates unborn ref */
2122f675 557 else if (!(local = lookup_commit_reference(the_repository, &local_oid)))
75ef3f4a 558 die("Could not parse local commit %s (%s)",
1e43ed98 559 oid_to_hex(&local_oid), o->local_ref);
560 trace_printf("\tlocal commit: %.7s\n", oid_to_hex(&local_oid));
75ef3f4a 561
5237e0eb 562 /* Dereference o->remote_ref into remote_oid */
1e43ed98 563 if (get_oid(o->remote_ref, &remote_oid)) {
75ef3f4a 564 /*
5237e0eb 565 * Failed to get remote_oid. If o->remote_ref looks like an
75ef3f4a
JH
566 * unborn ref, perform the merge using an empty notes tree.
567 */
8d9c5010 568 if (!check_refname_format(o->remote_ref, 0)) {
1e43ed98 569 oidclr(&remote_oid);
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JH
570 remote = NULL;
571 } else {
572 die("Failed to resolve remote notes ref '%s'",
573 o->remote_ref);
574 }
2122f675 575 } else if (!(remote = lookup_commit_reference(the_repository, &remote_oid))) {
75ef3f4a 576 die("Could not parse remote commit %s (%s)",
1e43ed98 577 oid_to_hex(&remote_oid), o->remote_ref);
75ef3f4a 578 }
1e43ed98 579 trace_printf("\tremote commit: %.7s\n", oid_to_hex(&remote_oid));
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JH
580
581 if (!local && !remote)
582 die("Cannot merge empty notes ref (%s) into empty notes ref "
583 "(%s)", o->remote_ref, o->local_ref);
584 if (!local) {
585 /* result == remote commit */
5237e0eb 586 oidcpy(result_oid, &remote_oid);
75ef3f4a
JH
587 goto found_result;
588 }
589 if (!remote) {
590 /* result == local commit */
5237e0eb 591 oidcpy(result_oid, &local_oid);
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JH
592 goto found_result;
593 }
594 assert(local && remote);
595
596 /* Find merge bases */
2ce406cc 597 bases = get_merge_bases(local, remote);
75ef3f4a 598 if (!bases) {
5237e0eb 599 base_oid = &null_oid;
eb0ccfd7 600 base_tree_oid = the_hash_algo->empty_tree;
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JN
601 if (o->verbosity >= 4)
602 printf("No merge base found; doing history-less merge\n");
75ef3f4a 603 } else if (!bases->next) {
5237e0eb 604 base_oid = &bases->item->object.oid;
2e27bd77 605 base_tree_oid = get_commit_tree_oid(bases->item);
5f9f8d15
JN
606 if (o->verbosity >= 4)
607 printf("One merge base found (%.7s)\n",
5237e0eb 608 oid_to_hex(base_oid));
75ef3f4a
JH
609 } else {
610 /* TODO: How to handle multiple merge-bases? */
5237e0eb 611 base_oid = &bases->item->object.oid;
2e27bd77 612 base_tree_oid = get_commit_tree_oid(bases->item);
5f9f8d15
JN
613 if (o->verbosity >= 3)
614 printf("Multiple merge bases found. Using the first "
5237e0eb 615 "(%.7s)\n", oid_to_hex(base_oid));
75ef3f4a
JH
616 }
617
5f9f8d15
JN
618 if (o->verbosity >= 4)
619 printf("Merging remote commit %.7s into local commit %.7s with "
f2fd0760 620 "merge-base %.7s\n", oid_to_hex(&remote->object.oid),
621 oid_to_hex(&local->object.oid),
5237e0eb 622 oid_to_hex(base_oid));
75ef3f4a 623
5237e0eb 624 if (!oidcmp(&remote->object.oid, base_oid)) {
75ef3f4a 625 /* Already merged; result == local commit */
5f9f8d15 626 if (o->verbosity >= 2)
7560f547 627 printf("Already up to date!\n");
5237e0eb 628 oidcpy(result_oid, &local->object.oid);
75ef3f4a
JH
629 goto found_result;
630 }
5237e0eb 631 if (!oidcmp(&local->object.oid, base_oid)) {
75ef3f4a 632 /* Fast-forward; result == remote commit */
5f9f8d15
JN
633 if (o->verbosity >= 2)
634 printf("Fast-forward\n");
5237e0eb 635 oidcpy(result_oid, &remote->object.oid);
75ef3f4a
JH
636 goto found_result;
637 }
638
2e27bd77
DS
639 result = merge_from_diffs(o, base_tree_oid,
640 get_commit_tree_oid(local),
641 get_commit_tree_oid(remote), local_tree);
2085b16a 642
809f38c8
JH
643 if (result != 0) { /* non-trivial merge (with or without conflicts) */
644 /* Commit (partial) result */
2085b16a
JH
645 struct commit_list *parents = NULL;
646 commit_list_insert(remote, &parents); /* LIFO order */
647 commit_list_insert(local, &parents);
5078f344
PO
648 create_notes_commit(local_tree, parents, o->commit_msg.buf,
649 o->commit_msg.len, result_oid);
2085b16a 650 }
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JH
651
652found_result:
653 free_commit_list(bases);
443259cf 654 strbuf_release(&(o->commit_msg));
5237e0eb
BW
655 trace_printf("notes_merge(): result = %i, result_oid = %.7s\n",
656 result, oid_to_hex(result_oid));
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JH
657 return result;
658}
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659
660int notes_merge_commit(struct notes_merge_options *o,
661 struct notes_tree *partial_tree,
662 struct commit *partial_commit,
5237e0eb 663 struct object_id *result_oid)
6abb3655
JH
664{
665 /*
666 * Iterate through files in .git/NOTES_MERGE_WORKTREE and add all
a0be62c1 667 * found notes to 'partial_tree'. Write the updated notes tree to
6abb3655
JH
668 * the DB, and commit the resulting tree object while reusing the
669 * commit message and parents from 'partial_commit'.
5237e0eb 670 * Finally store the new commit object OID into 'result_oid'.
6abb3655 671 */
a0be62c1
JH
672 DIR *dir;
673 struct dirent *e;
674 struct strbuf path = STRBUF_INIT;
8597ea3a 675 const char *buffer = get_commit_buffer(partial_commit, NULL);
bc6b8fc1 676 const char *msg = strstr(buffer, "\n\n");
a0be62c1 677 int baselen;
6abb3655 678
8c2ca3a6 679 git_path_buf(&path, NOTES_MERGE_WORKTREE);
5f9f8d15 680 if (o->verbosity >= 3)
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JH
681 printf("Committing notes in notes merge worktree at %s\n",
682 path.buf);
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JH
683
684 if (!msg || msg[2] == '\0')
685 die("partial notes commit has empty message");
686 msg += 2;
687
a0be62c1
JH
688 dir = opendir(path.buf);
689 if (!dir)
690 die_errno("could not open %s", path.buf);
691
692 strbuf_addch(&path, '/');
693 baselen = path.len;
694 while ((e = readdir(dir)) != NULL) {
6abb3655 695 struct stat st;
5ee8a954 696 struct object_id obj_oid, blob_oid;
6abb3655 697
a0be62c1
JH
698 if (is_dot_or_dotdot(e->d_name))
699 continue;
700
5ee8a954 701 if (get_oid_hex(e->d_name, &obj_oid)) {
5f9f8d15 702 if (o->verbosity >= 3)
a0be62c1
JH
703 printf("Skipping non-SHA1 entry '%s%s'\n",
704 path.buf, e->d_name);
6abb3655
JH
705 continue;
706 }
707
a0be62c1 708 strbuf_addstr(&path, e->d_name);
6abb3655 709 /* write file as blob, and add to partial_tree */
a0be62c1
JH
710 if (stat(path.buf, &st))
711 die_errno("Failed to stat '%s'", path.buf);
98e019b0 712 if (index_path(&blob_oid, path.buf, &st, HASH_WRITE_OBJECT))
a0be62c1 713 die("Failed to write blob object from '%s'", path.buf);
5ee8a954 714 if (add_note(partial_tree, &obj_oid, &blob_oid, NULL))
6abb3655 715 die("Failed to add resolved note '%s' to notes tree",
a0be62c1 716 path.buf);
5f9f8d15
JN
717 if (o->verbosity >= 4)
718 printf("Added resolved note for object %s: %s\n",
5ee8a954 719 oid_to_hex(&obj_oid), oid_to_hex(&blob_oid));
a0be62c1 720 strbuf_setlen(&path, baselen);
6abb3655
JH
721 }
722
5078f344
PO
723 create_notes_commit(partial_tree, partial_commit->parents, msg,
724 strlen(msg), result_oid);
bc6b8fc1 725 unuse_commit_buffer(partial_commit, buffer);
5f9f8d15
JN
726 if (o->verbosity >= 4)
727 printf("Finalized notes merge commit: %s\n",
5237e0eb 728 oid_to_hex(result_oid));
a0be62c1
JH
729 strbuf_release(&path);
730 closedir(dir);
6abb3655
JH
731 return 0;
732}
733
734int notes_merge_abort(struct notes_merge_options *o)
735{
dabba590
JH
736 /*
737 * Remove all files within .git/NOTES_MERGE_WORKTREE. We do not remove
738 * the .git/NOTES_MERGE_WORKTREE directory itself, since it might be
739 * the current working directory of the user.
740 */
6abb3655
JH
741 struct strbuf buf = STRBUF_INIT;
742 int ret;
743
8c2ca3a6 744 git_path_buf(&buf, NOTES_MERGE_WORKTREE);
5f9f8d15 745 if (o->verbosity >= 3)
dabba590
JH
746 printf("Removing notes merge worktree at %s/*\n", buf.buf);
747 ret = remove_dir_recursively(&buf, REMOVE_DIR_KEEP_TOPLEVEL);
6abb3655
JH
748 strbuf_release(&buf);
749 return ret;
750}