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Commit | Line | Data |
---|---|---|
5b2fd956 | 1 | #include "cache.h" |
b2141fc1 | 2 | #include "config.h" |
697cc8ef | 3 | #include "lockfile.h" |
c455c87c | 4 | #include "string-list.h" |
5b2fd956 | 5 | #include "rerere.h" |
5b2fd956 | 6 | #include "xdiff-interface.h" |
dea4562b JH |
7 | #include "dir.h" |
8 | #include "resolve-undo.h" | |
9 | #include "ll-merge.h" | |
8588567c | 10 | #include "attr.h" |
01a10b0a | 11 | #include "pathspec.h" |
1869bbe1 | 12 | #include "sha1-lookup.h" |
5b2fd956 | 13 | |
ac49f5ca MZ |
14 | #define RESOLVED 0 |
15 | #define PUNTED 1 | |
16 | #define THREE_STAGED 2 | |
17 | void *RERERE_RESOLVED = &RERERE_RESOLVED; | |
18 | ||
5b2fd956 SB |
19 | /* if rerere_enabled == -1, fall back to detection of .git/rr-cache */ |
20 | static int rerere_enabled = -1; | |
21 | ||
22 | /* automatically update cleanly resolved paths to the index */ | |
23 | static int rerere_autoupdate; | |
24 | ||
1869bbe1 JH |
25 | static int rerere_dir_nr; |
26 | static int rerere_dir_alloc; | |
27 | ||
2c7929b1 JH |
28 | #define RR_HAS_POSTIMAGE 1 |
29 | #define RR_HAS_PREIMAGE 2 | |
1869bbe1 JH |
30 | static struct rerere_dir { |
31 | unsigned char sha1[20]; | |
a13d1370 JH |
32 | int status_alloc, status_nr; |
33 | unsigned char *status; | |
1869bbe1 JH |
34 | } **rerere_dir; |
35 | ||
36 | static void free_rerere_dirs(void) | |
37 | { | |
38 | int i; | |
a13d1370 JH |
39 | for (i = 0; i < rerere_dir_nr; i++) { |
40 | free(rerere_dir[i]->status); | |
1869bbe1 | 41 | free(rerere_dir[i]); |
a13d1370 | 42 | } |
88ce3ef6 | 43 | FREE_AND_NULL(rerere_dir); |
1869bbe1 | 44 | rerere_dir_nr = rerere_dir_alloc = 0; |
1869bbe1 JH |
45 | } |
46 | ||
1d51eced | 47 | static void free_rerere_id(struct string_list_item *item) |
5b2fd956 | 48 | { |
1d51eced | 49 | free(item->util); |
5b2fd956 SB |
50 | } |
51 | ||
1d51eced JH |
52 | static const char *rerere_id_hex(const struct rerere_id *id) |
53 | { | |
1869bbe1 | 54 | return sha1_to_hex(id->collection->sha1); |
1d51eced JH |
55 | } |
56 | ||
a13d1370 JH |
57 | static void fit_variant(struct rerere_dir *rr_dir, int variant) |
58 | { | |
59 | variant++; | |
60 | ALLOC_GROW(rr_dir->status, variant, rr_dir->status_alloc); | |
61 | if (rr_dir->status_nr < variant) { | |
62 | memset(rr_dir->status + rr_dir->status_nr, | |
63 | '\0', variant - rr_dir->status_nr); | |
64 | rr_dir->status_nr = variant; | |
65 | } | |
66 | } | |
67 | ||
68 | static void assign_variant(struct rerere_id *id) | |
69 | { | |
70 | int variant; | |
71 | struct rerere_dir *rr_dir = id->collection; | |
72 | ||
73 | variant = id->variant; | |
74 | if (variant < 0) { | |
629716d2 JH |
75 | for (variant = 0; variant < rr_dir->status_nr; variant++) |
76 | if (!rr_dir->status[variant]) | |
77 | break; | |
a13d1370 JH |
78 | } |
79 | fit_variant(rr_dir, variant); | |
80 | id->variant = variant; | |
1d51eced JH |
81 | } |
82 | ||
83 | const char *rerere_path(const struct rerere_id *id, const char *file) | |
84 | { | |
85 | if (!file) | |
86 | return git_path("rr-cache/%s", rerere_id_hex(id)); | |
87 | ||
a13d1370 JH |
88 | if (id->variant <= 0) |
89 | return git_path("rr-cache/%s/%s", rerere_id_hex(id), file); | |
90 | ||
91 | return git_path("rr-cache/%s/%s.%d", | |
92 | rerere_id_hex(id), file, id->variant); | |
5b2fd956 SB |
93 | } |
94 | ||
a13d1370 | 95 | static int is_rr_file(const char *name, const char *filename, int *variant) |
2c7929b1 | 96 | { |
a13d1370 JH |
97 | const char *suffix; |
98 | char *ep; | |
99 | ||
100 | if (!strcmp(name, filename)) { | |
101 | *variant = 0; | |
102 | return 1; | |
103 | } | |
104 | if (!skip_prefix(name, filename, &suffix) || *suffix != '.') | |
105 | return 0; | |
106 | ||
107 | errno = 0; | |
108 | *variant = strtol(suffix + 1, &ep, 10); | |
109 | if (errno || *ep) | |
110 | return 0; | |
111 | return 1; | |
2c7929b1 JH |
112 | } |
113 | ||
114 | static void scan_rerere_dir(struct rerere_dir *rr_dir) | |
115 | { | |
116 | struct dirent *de; | |
117 | DIR *dir = opendir(git_path("rr-cache/%s", sha1_to_hex(rr_dir->sha1))); | |
118 | ||
119 | if (!dir) | |
120 | return; | |
121 | while ((de = readdir(dir)) != NULL) { | |
a13d1370 JH |
122 | int variant; |
123 | ||
124 | if (is_rr_file(de->d_name, "postimage", &variant)) { | |
125 | fit_variant(rr_dir, variant); | |
126 | rr_dir->status[variant] |= RR_HAS_POSTIMAGE; | |
127 | } else if (is_rr_file(de->d_name, "preimage", &variant)) { | |
128 | fit_variant(rr_dir, variant); | |
129 | rr_dir->status[variant] |= RR_HAS_PREIMAGE; | |
130 | } | |
2c7929b1 JH |
131 | } |
132 | closedir(dir); | |
133 | } | |
134 | ||
1869bbe1 JH |
135 | static const unsigned char *rerere_dir_sha1(size_t i, void *table) |
136 | { | |
137 | struct rerere_dir **rr_dir = table; | |
138 | return rr_dir[i]->sha1; | |
139 | } | |
140 | ||
141 | static struct rerere_dir *find_rerere_dir(const char *hex) | |
142 | { | |
143 | unsigned char sha1[20]; | |
144 | struct rerere_dir *rr_dir; | |
145 | int pos; | |
146 | ||
147 | if (get_sha1_hex(hex, sha1)) | |
148 | return NULL; /* BUG */ | |
149 | pos = sha1_pos(sha1, rerere_dir, rerere_dir_nr, rerere_dir_sha1); | |
150 | if (pos < 0) { | |
151 | rr_dir = xmalloc(sizeof(*rr_dir)); | |
152 | hashcpy(rr_dir->sha1, sha1); | |
a13d1370 JH |
153 | rr_dir->status = NULL; |
154 | rr_dir->status_nr = 0; | |
155 | rr_dir->status_alloc = 0; | |
1869bbe1 JH |
156 | pos = -1 - pos; |
157 | ||
158 | /* Make sure the array is big enough ... */ | |
159 | ALLOC_GROW(rerere_dir, rerere_dir_nr + 1, rerere_dir_alloc); | |
160 | /* ... and add it in. */ | |
161 | rerere_dir_nr++; | |
f919ffeb SG |
162 | MOVE_ARRAY(rerere_dir + pos + 1, rerere_dir + pos, |
163 | rerere_dir_nr - pos - 1); | |
1869bbe1 | 164 | rerere_dir[pos] = rr_dir; |
2c7929b1 | 165 | scan_rerere_dir(rr_dir); |
1869bbe1 JH |
166 | } |
167 | return rerere_dir[pos]; | |
5b2fd956 SB |
168 | } |
169 | ||
1d51eced | 170 | static int has_rerere_resolution(const struct rerere_id *id) |
5b2fd956 | 171 | { |
05dd9f13 | 172 | const int both = RR_HAS_POSTIMAGE|RR_HAS_PREIMAGE; |
a13d1370 | 173 | int variant = id->variant; |
1d51eced | 174 | |
a13d1370 JH |
175 | if (variant < 0) |
176 | return 0; | |
177 | return ((id->collection->status[variant] & both) == both); | |
5b2fd956 SB |
178 | } |
179 | ||
1d51eced JH |
180 | static struct rerere_id *new_rerere_id_hex(char *hex) |
181 | { | |
182 | struct rerere_id *id = xmalloc(sizeof(*id)); | |
1869bbe1 | 183 | id->collection = find_rerere_dir(hex); |
a13d1370 | 184 | id->variant = -1; /* not known yet */ |
1d51eced JH |
185 | return id; |
186 | } | |
187 | ||
188 | static struct rerere_id *new_rerere_id(unsigned char *sha1) | |
189 | { | |
190 | return new_rerere_id_hex(sha1_to_hex(sha1)); | |
5b2fd956 SB |
191 | } |
192 | ||
4b68c2a0 JH |
193 | /* |
194 | * $GIT_DIR/MERGE_RR file is a collection of records, each of which is | |
195 | * "conflict ID", a HT and pathname, terminated with a NUL, and is | |
196 | * used to keep track of the set of paths that "rerere" may need to | |
197 | * work on (i.e. what is left by the previous invocation of "git | |
198 | * rerere" during the current conflict resolution session). | |
199 | */ | |
c455c87c | 200 | static void read_rr(struct string_list *rr) |
5b2fd956 | 201 | { |
f5800f6a | 202 | struct strbuf buf = STRBUF_INIT; |
e9d983f1 | 203 | FILE *in = fopen_or_warn(git_path_merge_rr(), "r"); |
f5800f6a | 204 | |
5b2fd956 SB |
205 | if (!in) |
206 | return; | |
f5800f6a JH |
207 | while (!strbuf_getwholeline(&buf, in, '\0')) { |
208 | char *path; | |
209 | unsigned char sha1[20]; | |
1d51eced | 210 | struct rerere_id *id; |
a13d1370 | 211 | int variant; |
f5800f6a JH |
212 | |
213 | /* There has to be the hash, tab, path and then NUL */ | |
214 | if (buf.len < 42 || get_sha1_hex(buf.buf, sha1)) | |
2373b650 | 215 | die(_("corrupt MERGE_RR")); |
f5800f6a | 216 | |
a13d1370 JH |
217 | if (buf.buf[40] != '.') { |
218 | variant = 0; | |
219 | path = buf.buf + 40; | |
220 | } else { | |
221 | errno = 0; | |
222 | variant = strtol(buf.buf + 41, &path, 10); | |
223 | if (errno) | |
2373b650 | 224 | die(_("corrupt MERGE_RR")); |
a13d1370 JH |
225 | } |
226 | if (*(path++) != '\t') | |
2373b650 | 227 | die(_("corrupt MERGE_RR")); |
f5800f6a | 228 | buf.buf[40] = '\0'; |
1d51eced | 229 | id = new_rerere_id_hex(buf.buf); |
a13d1370 | 230 | id->variant = variant; |
1d51eced | 231 | string_list_insert(rr, path)->util = id; |
5b2fd956 | 232 | } |
f5800f6a | 233 | strbuf_release(&buf); |
5b2fd956 SB |
234 | fclose(in); |
235 | } | |
236 | ||
237 | static struct lock_file write_lock; | |
238 | ||
c455c87c | 239 | static int write_rr(struct string_list *rr, int out_fd) |
5b2fd956 SB |
240 | { |
241 | int i; | |
242 | for (i = 0; i < rr->nr; i++) { | |
e2cb6a95 | 243 | struct strbuf buf = STRBUF_INIT; |
1d51eced | 244 | struct rerere_id *id; |
e2cb6a95 JH |
245 | |
246 | assert(rr->items[i].util != RERERE_RESOLVED); | |
1d51eced JH |
247 | |
248 | id = rr->items[i].util; | |
249 | if (!id) | |
5b2fd956 | 250 | continue; |
a13d1370 JH |
251 | assert(id->variant >= 0); |
252 | if (0 < id->variant) | |
253 | strbuf_addf(&buf, "%s.%d\t%s%c", | |
254 | rerere_id_hex(id), id->variant, | |
255 | rr->items[i].string, 0); | |
256 | else | |
257 | strbuf_addf(&buf, "%s\t%s%c", | |
258 | rerere_id_hex(id), | |
259 | rr->items[i].string, 0); | |
260 | ||
06f46f23 | 261 | if (write_in_full(out_fd, buf.buf, buf.len) < 0) |
2373b650 | 262 | die(_("unable to write rerere record")); |
e2cb6a95 JH |
263 | |
264 | strbuf_release(&buf); | |
5b2fd956 SB |
265 | } |
266 | if (commit_lock_file(&write_lock) != 0) | |
2373b650 | 267 | die(_("unable to write rerere record")); |
5b2fd956 SB |
268 | return 0; |
269 | } | |
270 | ||
a96847cc JH |
271 | /* |
272 | * "rerere" interacts with conflicted file contents using this I/O | |
273 | * abstraction. It reads a conflicted contents from one place via | |
274 | * "getline()" method, and optionally can write it out after | |
275 | * normalizing the conflicted hunks to the "output". Subclasses of | |
276 | * rerere_io embed this structure at the beginning of their own | |
277 | * rerere_io object. | |
278 | */ | |
279 | struct rerere_io { | |
280 | int (*getline)(struct strbuf *, struct rerere_io *); | |
281 | FILE *output; | |
282 | int wrerror; | |
283 | /* some more stuff */ | |
284 | }; | |
285 | ||
47d32af2 AR |
286 | static void ferr_write(const void *p, size_t count, FILE *fp, int *err) |
287 | { | |
288 | if (!count || *err) | |
289 | return; | |
290 | if (fwrite(p, count, 1, fp) != 1) | |
291 | *err = errno; | |
292 | } | |
293 | ||
294 | static inline void ferr_puts(const char *s, FILE *fp, int *err) | |
295 | { | |
296 | ferr_write(s, strlen(s), fp, err); | |
297 | } | |
298 | ||
27d6b085 JH |
299 | static void rerere_io_putstr(const char *str, struct rerere_io *io) |
300 | { | |
301 | if (io->output) | |
302 | ferr_puts(str, io->output, &io->wrerror); | |
303 | } | |
304 | ||
305 | static void rerere_io_putmem(const char *mem, size_t sz, struct rerere_io *io) | |
306 | { | |
307 | if (io->output) | |
308 | ferr_write(mem, sz, io->output, &io->wrerror); | |
309 | } | |
310 | ||
a96847cc JH |
311 | /* |
312 | * Subclass of rerere_io that reads from an on-disk file | |
313 | */ | |
27d6b085 JH |
314 | struct rerere_io_file { |
315 | struct rerere_io io; | |
316 | FILE *input; | |
317 | }; | |
318 | ||
a96847cc JH |
319 | /* |
320 | * ... and its getline() method implementation | |
321 | */ | |
27d6b085 JH |
322 | static int rerere_file_getline(struct strbuf *sb, struct rerere_io *io_) |
323 | { | |
324 | struct rerere_io_file *io = (struct rerere_io_file *)io_; | |
325 | return strbuf_getwholeline(sb, io->input, '\n'); | |
326 | } | |
327 | ||
67711cdc JH |
328 | /* |
329 | * Require the exact number of conflict marker letters, no more, no | |
330 | * less, followed by SP or any whitespace | |
331 | * (including LF). | |
332 | */ | |
333 | static int is_cmarker(char *buf, int marker_char, int marker_size) | |
191f2417 | 334 | { |
67711cdc JH |
335 | int want_sp; |
336 | ||
337 | /* | |
338 | * The beginning of our version and the end of their version | |
339 | * always are labeled like "<<<<< ours" or ">>>>> theirs", | |
340 | * hence we set want_sp for them. Note that the version from | |
341 | * the common ancestor in diff3-style output is not always | |
342 | * labelled (e.g. "||||| common" is often seen but "|||||" | |
343 | * alone is also valid), so we do not set want_sp. | |
344 | */ | |
345 | want_sp = (marker_char == '<') || (marker_char == '>'); | |
346 | ||
191f2417 JH |
347 | while (marker_size--) |
348 | if (*buf++ != marker_char) | |
349 | return 0; | |
350 | if (want_sp && *buf != ' ') | |
351 | return 0; | |
352 | return isspace(*buf); | |
353 | } | |
354 | ||
5ebbdad3 TG |
355 | static void rerere_strbuf_putconflict(struct strbuf *buf, int ch, size_t size) |
356 | { | |
357 | strbuf_addchars(buf, ch, size); | |
358 | strbuf_addch(buf, '\n'); | |
359 | } | |
360 | ||
361 | static int handle_conflict(struct strbuf *out, struct rerere_io *io, | |
362 | int marker_size, git_SHA_CTX *ctx) | |
5b2fd956 | 363 | { |
cc58d7df | 364 | enum { |
c0f16f8e TG |
365 | RR_SIDE_1 = 0, RR_SIDE_2, RR_ORIGINAL |
366 | } hunk = RR_SIDE_1; | |
f285a2d7 | 367 | struct strbuf one = STRBUF_INIT, two = STRBUF_INIT; |
d58ee6db | 368 | struct strbuf buf = STRBUF_INIT; |
c0f16f8e | 369 | int has_conflicts = -1; |
5b2fd956 | 370 | |
27d6b085 | 371 | while (!io->getline(&buf, io)) { |
67711cdc | 372 | if (is_cmarker(buf.buf, '<', marker_size)) { |
c0f16f8e | 373 | break; |
67711cdc | 374 | } else if (is_cmarker(buf.buf, '|', marker_size)) { |
cc58d7df | 375 | if (hunk != RR_SIDE_1) |
c0f16f8e | 376 | break; |
387c9d49 | 377 | hunk = RR_ORIGINAL; |
67711cdc | 378 | } else if (is_cmarker(buf.buf, '=', marker_size)) { |
387c9d49 | 379 | if (hunk != RR_SIDE_1 && hunk != RR_ORIGINAL) |
c0f16f8e | 380 | break; |
cc58d7df | 381 | hunk = RR_SIDE_2; |
67711cdc | 382 | } else if (is_cmarker(buf.buf, '>', marker_size)) { |
cc58d7df | 383 | if (hunk != RR_SIDE_2) |
c0f16f8e | 384 | break; |
5b2fd956 SB |
385 | if (strbuf_cmp(&one, &two) > 0) |
386 | strbuf_swap(&one, &two); | |
221444f5 | 387 | has_conflicts = 1; |
5ebbdad3 TG |
388 | rerere_strbuf_putconflict(out, '<', marker_size); |
389 | strbuf_addbuf(out, &one); | |
390 | rerere_strbuf_putconflict(out, '=', marker_size); | |
391 | strbuf_addbuf(out, &two); | |
392 | rerere_strbuf_putconflict(out, '>', marker_size); | |
c0f16f8e TG |
393 | if (ctx) { |
394 | git_SHA1_Update(ctx, one.buf ? one.buf : "", | |
5b2fd956 | 395 | one.len + 1); |
c0f16f8e | 396 | git_SHA1_Update(ctx, two.buf ? two.buf : "", |
5b2fd956 SB |
397 | two.len + 1); |
398 | } | |
c0f16f8e | 399 | break; |
cc58d7df | 400 | } else if (hunk == RR_SIDE_1) |
e992d1eb | 401 | strbuf_addbuf(&one, &buf); |
387c9d49 JH |
402 | else if (hunk == RR_ORIGINAL) |
403 | ; /* discard */ | |
cc58d7df | 404 | else if (hunk == RR_SIDE_2) |
e992d1eb | 405 | strbuf_addbuf(&two, &buf); |
5b2fd956 SB |
406 | } |
407 | strbuf_release(&one); | |
408 | strbuf_release(&two); | |
d58ee6db | 409 | strbuf_release(&buf); |
5b2fd956 | 410 | |
c0f16f8e TG |
411 | return has_conflicts; |
412 | } | |
413 | ||
414 | /* | |
415 | * Read contents a file with conflicts, normalize the conflicts | |
416 | * by (1) discarding the common ancestor version in diff3-style, | |
417 | * (2) reordering our side and their side so that whichever sorts | |
418 | * alphabetically earlier comes before the other one, while | |
419 | * computing the "conflict ID", which is just an SHA-1 hash of | |
420 | * one side of the conflict, NUL, the other side of the conflict, | |
421 | * and NUL concatenated together. | |
422 | * | |
423 | * Return 1 if conflict hunks are found, 0 if there are no conflict | |
424 | * hunks and -1 if an error occured. | |
425 | */ | |
426 | static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_size) | |
427 | { | |
428 | git_SHA_CTX ctx; | |
5ebbdad3 | 429 | struct strbuf buf = STRBUF_INIT, out = STRBUF_INIT; |
c0f16f8e TG |
430 | int has_conflicts = 0; |
431 | if (sha1) | |
432 | git_SHA1_Init(&ctx); | |
433 | ||
434 | while (!io->getline(&buf, io)) { | |
435 | if (is_cmarker(buf.buf, '<', marker_size)) { | |
5ebbdad3 | 436 | has_conflicts = handle_conflict(&out, io, marker_size, |
c0f16f8e TG |
437 | sha1 ? &ctx : NULL); |
438 | if (has_conflicts < 0) | |
439 | break; | |
5ebbdad3 TG |
440 | rerere_io_putmem(out.buf, out.len, io); |
441 | strbuf_reset(&out); | |
c0f16f8e TG |
442 | } else |
443 | rerere_io_putstr(buf.buf, io); | |
444 | } | |
445 | strbuf_release(&buf); | |
5ebbdad3 | 446 | strbuf_release(&out); |
c0f16f8e | 447 | |
5b2fd956 | 448 | if (sha1) |
9126f009 | 449 | git_SHA1_Final(sha1, &ctx); |
c0f16f8e | 450 | |
221444f5 | 451 | return has_conflicts; |
27d6b085 JH |
452 | } |
453 | ||
cc899eca JH |
454 | /* |
455 | * Scan the path for conflicts, do the "handle_path()" thing above, and | |
456 | * return the number of conflict hunks found. | |
457 | */ | |
27d6b085 JH |
458 | static int handle_file(const char *path, unsigned char *sha1, const char *output) |
459 | { | |
221444f5 | 460 | int has_conflicts = 0; |
27d6b085 | 461 | struct rerere_io_file io; |
8588567c | 462 | int marker_size = ll_merge_marker_size(path); |
27d6b085 JH |
463 | |
464 | memset(&io, 0, sizeof(io)); | |
465 | io.io.getline = rerere_file_getline; | |
466 | io.input = fopen(path, "r"); | |
467 | io.io.wrerror = 0; | |
468 | if (!io.input) | |
2373b650 | 469 | return error_errno(_("could not open '%s'"), path); |
27d6b085 JH |
470 | |
471 | if (output) { | |
472 | io.io.output = fopen(output, "w"); | |
473 | if (!io.io.output) { | |
2373b650 | 474 | error_errno(_("could not write '%s'"), output); |
27d6b085 | 475 | fclose(io.input); |
f7566f07 | 476 | return -1; |
27d6b085 JH |
477 | } |
478 | } | |
479 | ||
221444f5 | 480 | has_conflicts = handle_path(sha1, (struct rerere_io *)&io, marker_size); |
27d6b085 JH |
481 | |
482 | fclose(io.input); | |
483 | if (io.io.wrerror) | |
2373b650 | 484 | error(_("there were errors while writing '%s' (%s)"), |
27d6b085 JH |
485 | path, strerror(io.io.wrerror)); |
486 | if (io.io.output && fclose(io.io.output)) | |
2373b650 | 487 | io.io.wrerror = error_errno(_("failed to flush '%s'"), path); |
27d6b085 | 488 | |
221444f5 | 489 | if (has_conflicts < 0) { |
5b2fd956 | 490 | if (output) |
691f1a28 | 491 | unlink_or_warn(output); |
2373b650 | 492 | return error(_("could not parse conflict hunks in '%s'"), path); |
5b2fd956 | 493 | } |
27d6b085 | 494 | if (io.io.wrerror) |
47d32af2 | 495 | return -1; |
221444f5 | 496 | return has_conflicts; |
5b2fd956 SB |
497 | } |
498 | ||
4b68c2a0 JH |
499 | /* |
500 | * Look at a cache entry at "i" and see if it is not conflicting, | |
501 | * conflicting and we are willing to handle, or conflicting and | |
502 | * we are unable to handle, and return the determination in *type. | |
503 | * Return the cache index to be looked at next, by skipping the | |
504 | * stages we have already looked at in this invocation of this | |
505 | * function. | |
506 | */ | |
ac49f5ca | 507 | static int check_one_conflict(int i, int *type) |
5b2fd956 | 508 | { |
9c5e6c80 | 509 | const struct cache_entry *e = active_cache[i]; |
ac49f5ca MZ |
510 | |
511 | if (!ce_stage(e)) { | |
512 | *type = RESOLVED; | |
513 | return i + 1; | |
514 | } | |
515 | ||
516 | *type = PUNTED; | |
5eda906b | 517 | while (ce_stage(active_cache[i]) == 1) |
fb70a06d | 518 | i++; |
ac49f5ca MZ |
519 | |
520 | /* Only handle regular files with both stages #2 and #3 */ | |
521 | if (i + 1 < active_nr) { | |
9c5e6c80 NTND |
522 | const struct cache_entry *e2 = active_cache[i]; |
523 | const struct cache_entry *e3 = active_cache[i + 1]; | |
5b2fd956 SB |
524 | if (ce_stage(e2) == 2 && |
525 | ce_stage(e3) == 3 && | |
ac49f5ca | 526 | ce_same_name(e, e3) && |
5b2fd956 | 527 | S_ISREG(e2->ce_mode) && |
ac49f5ca MZ |
528 | S_ISREG(e3->ce_mode)) |
529 | *type = THREE_STAGED; | |
530 | } | |
531 | ||
532 | /* Skip the entries with the same name */ | |
533 | while (i < active_nr && ce_same_name(e, active_cache[i])) | |
534 | i++; | |
535 | return i; | |
536 | } | |
537 | ||
4b68c2a0 JH |
538 | /* |
539 | * Scan the index and find paths that have conflicts that rerere can | |
540 | * handle, i.e. the ones that has both stages #2 and #3. | |
541 | * | |
542 | * NEEDSWORK: we do not record or replay a previous "resolve by | |
543 | * deletion" for a delete-modify conflict, as that is inherently risky | |
544 | * without knowing what modification is being discarded. The only | |
545 | * safe case, i.e. both side doing the deletion and modification that | |
546 | * are identical to the previous round, might want to be handled, | |
547 | * though. | |
548 | */ | |
ac49f5ca MZ |
549 | static int find_conflict(struct string_list *conflict) |
550 | { | |
551 | int i; | |
552 | if (read_cache() < 0) | |
2373b650 | 553 | return error(_("index file corrupt")); |
ac49f5ca MZ |
554 | |
555 | for (i = 0; i < active_nr;) { | |
556 | int conflict_type; | |
9c5e6c80 | 557 | const struct cache_entry *e = active_cache[i]; |
ac49f5ca MZ |
558 | i = check_one_conflict(i, &conflict_type); |
559 | if (conflict_type == THREE_STAGED) | |
560 | string_list_insert(conflict, (const char *)e->name); | |
561 | } | |
562 | return 0; | |
563 | } | |
564 | ||
4b68c2a0 JH |
565 | /* |
566 | * The merge_rr list is meant to hold outstanding conflicted paths | |
567 | * that rerere could handle. Abuse the list by adding other types of | |
568 | * entries to allow the caller to show "rerere remaining". | |
569 | * | |
570 | * - Conflicted paths that rerere does not handle are added | |
571 | * - Conflicted paths that have been resolved are marked as such | |
572 | * by storing RERERE_RESOLVED to .util field (where conflict ID | |
573 | * is expected to be stored). | |
574 | * | |
575 | * Do *not* write MERGE_RR file out after calling this function. | |
576 | * | |
577 | * NEEDSWORK: we may want to fix the caller that implements "rerere | |
578 | * remaining" to do this without abusing merge_rr. | |
579 | */ | |
ac49f5ca MZ |
580 | int rerere_remaining(struct string_list *merge_rr) |
581 | { | |
582 | int i; | |
9dd330e6 JK |
583 | if (setup_rerere(merge_rr, RERERE_READONLY)) |
584 | return 0; | |
ac49f5ca | 585 | if (read_cache() < 0) |
2373b650 | 586 | return error(_("index file corrupt")); |
ac49f5ca MZ |
587 | |
588 | for (i = 0; i < active_nr;) { | |
589 | int conflict_type; | |
9c5e6c80 | 590 | const struct cache_entry *e = active_cache[i]; |
ac49f5ca MZ |
591 | i = check_one_conflict(i, &conflict_type); |
592 | if (conflict_type == PUNTED) | |
593 | string_list_insert(merge_rr, (const char *)e->name); | |
594 | else if (conflict_type == RESOLVED) { | |
595 | struct string_list_item *it; | |
596 | it = string_list_lookup(merge_rr, (const char *)e->name); | |
597 | if (it != NULL) { | |
1d51eced | 598 | free_rerere_id(it); |
ac49f5ca MZ |
599 | it->util = RERERE_RESOLVED; |
600 | } | |
5b2fd956 SB |
601 | } |
602 | } | |
603 | return 0; | |
604 | } | |
605 | ||
0ce02b36 JH |
606 | /* |
607 | * Try using the given conflict resolution "ID" to see | |
608 | * if that recorded conflict resolves cleanly what we | |
609 | * got in the "cur". | |
610 | */ | |
611 | static int try_merge(const struct rerere_id *id, const char *path, | |
612 | mmfile_t *cur, mmbuffer_t *result) | |
613 | { | |
614 | int ret; | |
615 | mmfile_t base = {NULL, 0}, other = {NULL, 0}; | |
616 | ||
617 | if (read_mmfile(&base, rerere_path(id, "preimage")) || | |
618 | read_mmfile(&other, rerere_path(id, "postimage"))) | |
619 | ret = 1; | |
620 | else | |
621 | /* | |
622 | * A three-way merge. Note that this honors user-customizable | |
623 | * low-level merge driver settings. | |
624 | */ | |
625 | ret = ll_merge(result, path, &base, NULL, cur, "", &other, "", NULL); | |
626 | ||
627 | free(base.ptr); | |
628 | free(other.ptr); | |
629 | ||
630 | return ret; | |
631 | } | |
632 | ||
cc899eca | 633 | /* |
18bb9934 | 634 | * Find the conflict identified by "id"; the change between its |
cc899eca JH |
635 | * "preimage" (i.e. a previous contents with conflict markers) and its |
636 | * "postimage" (i.e. the corresponding contents with conflicts | |
637 | * resolved) may apply cleanly to the contents stored in "path", i.e. | |
638 | * the conflict this time around. | |
639 | * | |
640 | * Returns 0 for successful replay of recorded resolution, or non-zero | |
641 | * for failure. | |
642 | */ | |
1d51eced | 643 | static int merge(const struct rerere_id *id, const char *path) |
5b2fd956 | 644 | { |
15ed07d5 | 645 | FILE *f; |
5b2fd956 | 646 | int ret; |
0ce02b36 | 647 | mmfile_t cur = {NULL, 0}; |
5b2fd956 | 648 | mmbuffer_t result = {NULL, 0}; |
5b2fd956 | 649 | |
cc899eca JH |
650 | /* |
651 | * Normalize the conflicts in path and write it out to | |
652 | * "thisimage" temporary file. | |
653 | */ | |
0ce02b36 JH |
654 | if ((handle_file(path, NULL, rerere_path(id, "thisimage")) < 0) || |
655 | read_mmfile(&cur, rerere_path(id, "thisimage"))) { | |
689b8c29 BW |
656 | ret = 1; |
657 | goto out; | |
658 | } | |
cc899eca | 659 | |
0ce02b36 | 660 | ret = try_merge(id, path, &cur, &result); |
15ed07d5 JH |
661 | if (ret) |
662 | goto out; | |
663 | ||
664 | /* | |
665 | * A successful replay of recorded resolution. | |
666 | * Mark that "postimage" was used to help gc. | |
667 | */ | |
668 | if (utime(rerere_path(id, "postimage"), NULL) < 0) | |
2373b650 | 669 | warning_errno(_("failed utime() on '%s'"), |
033e011e | 670 | rerere_path(id, "postimage")); |
15ed07d5 JH |
671 | |
672 | /* Update "path" with the resolution */ | |
673 | f = fopen(path, "w"); | |
674 | if (!f) | |
2373b650 | 675 | return error_errno(_("could not open '%s'"), path); |
15ed07d5 | 676 | if (fwrite(result.ptr, result.size, 1, f) != 1) |
2373b650 | 677 | error_errno(_("could not write '%s'"), path); |
15ed07d5 | 678 | if (fclose(f)) |
2373b650 | 679 | return error_errno(_("writing '%s' failed"), path); |
5b2fd956 | 680 | |
689b8c29 | 681 | out: |
5b2fd956 | 682 | free(cur.ptr); |
5b2fd956 SB |
683 | free(result.ptr); |
684 | ||
685 | return ret; | |
686 | } | |
687 | ||
89ea9035 | 688 | static void update_paths(struct string_list *update) |
5b2fd956 | 689 | { |
0fa5a2ed | 690 | struct lock_file index_lock = LOCK_INIT; |
5b2fd956 | 691 | int i; |
5b2fd956 | 692 | |
b3e83cc7 | 693 | hold_locked_index(&index_lock, LOCK_DIE_ON_ERROR); |
5b2fd956 SB |
694 | |
695 | for (i = 0; i < update->nr; i++) { | |
c455c87c | 696 | struct string_list_item *item = &update->items[i]; |
89ea9035 JN |
697 | if (add_file_to_cache(item->string, 0)) |
698 | exit(128); | |
2373b650 | 699 | fprintf_ln(stderr, _("Staged '%s' using previous resolution."), |
a14c7ab8 | 700 | item->string); |
5b2fd956 SB |
701 | } |
702 | ||
61000814 MÅ |
703 | if (write_locked_index(&the_index, &index_lock, |
704 | COMMIT_LOCK | SKIP_IF_UNCHANGED)) | |
2373b650 | 705 | die(_("unable to write new index file")); |
5b2fd956 SB |
706 | } |
707 | ||
629716d2 JH |
708 | static void remove_variant(struct rerere_id *id) |
709 | { | |
710 | unlink_or_warn(rerere_path(id, "postimage")); | |
711 | unlink_or_warn(rerere_path(id, "preimage")); | |
712 | id->collection->status[id->variant] = 0; | |
713 | } | |
714 | ||
8e7768b2 JH |
715 | /* |
716 | * The path indicated by rr_item may still have conflict for which we | |
717 | * have a recorded resolution, in which case replay it and optionally | |
718 | * update it. Or it may have been resolved by the user and we may | |
719 | * only have the preimage for that conflict, in which case the result | |
720 | * needs to be recorded as a resolution in a postimage file. | |
721 | */ | |
722 | static void do_rerere_one_path(struct string_list_item *rr_item, | |
723 | struct string_list *update) | |
724 | { | |
725 | const char *path = rr_item->string; | |
a13d1370 | 726 | struct rerere_id *id = rr_item->util; |
629716d2 | 727 | struct rerere_dir *rr_dir = id->collection; |
a13d1370 JH |
728 | int variant; |
729 | ||
a13d1370 | 730 | variant = id->variant; |
8e7768b2 | 731 | |
629716d2 JH |
732 | /* Has the user resolved it already? */ |
733 | if (variant >= 0) { | |
734 | if (!handle_file(path, NULL, NULL)) { | |
735 | copy_file(rerere_path(id, "postimage"), path, 0666); | |
736 | id->collection->status[variant] |= RR_HAS_POSTIMAGE; | |
2373b650 | 737 | fprintf_ln(stderr, _("Recorded resolution for '%s'."), path); |
629716d2 JH |
738 | free_rerere_id(rr_item); |
739 | rr_item->util = NULL; | |
740 | return; | |
741 | } | |
c0a5423b | 742 | /* |
629716d2 JH |
743 | * There may be other variants that can cleanly |
744 | * replay. Try them and update the variant number for | |
745 | * this one. | |
c0a5423b | 746 | */ |
629716d2 JH |
747 | } |
748 | ||
749 | /* Does any existing resolution apply cleanly? */ | |
750 | for (variant = 0; variant < rr_dir->status_nr; variant++) { | |
751 | const int both = RR_HAS_PREIMAGE | RR_HAS_POSTIMAGE; | |
752 | struct rerere_id vid = *id; | |
753 | ||
754 | if ((rr_dir->status[variant] & both) != both) | |
755 | continue; | |
8e7768b2 | 756 | |
629716d2 JH |
757 | vid.variant = variant; |
758 | if (merge(&vid, path)) | |
759 | continue; /* failed to replay */ | |
760 | ||
761 | /* | |
762 | * If there already is a different variant that applies | |
763 | * cleanly, there is no point maintaining our own variant. | |
764 | */ | |
765 | if (0 <= id->variant && id->variant != variant) | |
766 | remove_variant(id); | |
8e7768b2 JH |
767 | |
768 | if (rerere_autoupdate) | |
769 | string_list_insert(update, path); | |
770 | else | |
2373b650 TG |
771 | fprintf_ln(stderr, |
772 | _("Resolved '%s' using previous resolution."), | |
773 | path); | |
629716d2 JH |
774 | free_rerere_id(rr_item); |
775 | rr_item->util = NULL; | |
925d73c4 | 776 | return; |
8e7768b2 | 777 | } |
629716d2 JH |
778 | |
779 | /* None of the existing one applies; we need a new variant */ | |
780 | assign_variant(id); | |
781 | ||
782 | variant = id->variant; | |
783 | handle_file(path, NULL, rerere_path(id, "preimage")); | |
784 | if (id->collection->status[variant] & RR_HAS_POSTIMAGE) { | |
785 | const char *path = rerere_path(id, "postimage"); | |
786 | if (unlink(path)) | |
2373b650 | 787 | die_errno(_("cannot unlink stray '%s'"), path); |
629716d2 JH |
788 | id->collection->status[variant] &= ~RR_HAS_POSTIMAGE; |
789 | } | |
790 | id->collection->status[variant] |= RR_HAS_PREIMAGE; | |
2373b650 | 791 | fprintf_ln(stderr, _("Recorded preimage for '%s'"), path); |
8e7768b2 JH |
792 | } |
793 | ||
c455c87c | 794 | static int do_plain_rerere(struct string_list *rr, int fd) |
5b2fd956 | 795 | { |
183113a5 TF |
796 | struct string_list conflict = STRING_LIST_INIT_DUP; |
797 | struct string_list update = STRING_LIST_INIT_DUP; | |
5b2fd956 SB |
798 | int i; |
799 | ||
800 | find_conflict(&conflict); | |
801 | ||
802 | /* | |
cc899eca JH |
803 | * MERGE_RR records paths with conflicts immediately after |
804 | * merge failed. Some of the conflicted paths might have been | |
805 | * hand resolved in the working tree since then, but the | |
806 | * initial run would catch all and register their preimages. | |
5b2fd956 | 807 | */ |
5b2fd956 | 808 | for (i = 0; i < conflict.nr; i++) { |
1d51eced | 809 | struct rerere_id *id; |
c7a25d37 | 810 | unsigned char sha1[20]; |
c455c87c | 811 | const char *path = conflict.items[i].string; |
93406a28 | 812 | int ret, has_string; |
5b2fd956 | 813 | |
c7a25d37 JH |
814 | /* |
815 | * Ask handle_file() to scan and assign a | |
816 | * conflict ID. No need to write anything out | |
817 | * yet. | |
818 | */ | |
819 | ret = handle_file(path, sha1, NULL); | |
93406a28 TG |
820 | has_string = string_list_has_string(rr, path); |
821 | if (ret < 0 && has_string) { | |
822 | remove_variant(string_list_lookup(rr, path)->util); | |
823 | string_list_remove(rr, path, 1); | |
824 | } | |
825 | if (ret < 1 || has_string) | |
c7a25d37 | 826 | continue; |
5b2fd956 | 827 | |
1d51eced | 828 | id = new_rerere_id(sha1); |
18bb9934 | 829 | string_list_insert(rr, path)->util = id; |
cc899eca | 830 | |
c0a5423b JH |
831 | /* Ensure that the directory exists. */ |
832 | mkdir_in_gitdir(rerere_path(id, NULL)); | |
5b2fd956 SB |
833 | } |
834 | ||
8e7768b2 JH |
835 | for (i = 0; i < rr->nr; i++) |
836 | do_rerere_one_path(&rr->items[i], &update); | |
5b2fd956 SB |
837 | |
838 | if (update.nr) | |
839 | update_paths(&update); | |
840 | ||
841 | return write_rr(rr, fd); | |
842 | } | |
843 | ||
633e5ad3 | 844 | static void git_rerere_config(void) |
5b2fd956 | 845 | { |
633e5ad3 TA |
846 | git_config_get_bool("rerere.enabled", &rerere_enabled); |
847 | git_config_get_bool("rerere.autoupdate", &rerere_autoupdate); | |
848 | git_config(git_default_config, NULL); | |
5b2fd956 SB |
849 | } |
850 | ||
f932729c JK |
851 | static GIT_PATH_FUNC(git_path_rr_cache, "rr-cache") |
852 | ||
5b2fd956 SB |
853 | static int is_rerere_enabled(void) |
854 | { | |
5b2fd956 SB |
855 | int rr_cache_exists; |
856 | ||
857 | if (!rerere_enabled) | |
858 | return 0; | |
859 | ||
f932729c | 860 | rr_cache_exists = is_directory(git_path_rr_cache()); |
5b2fd956 SB |
861 | if (rerere_enabled < 0) |
862 | return rr_cache_exists; | |
863 | ||
f932729c | 864 | if (!rr_cache_exists && mkdir_in_gitdir(git_path_rr_cache())) |
2373b650 | 865 | die(_("could not create directory '%s'"), git_path_rr_cache()); |
5b2fd956 SB |
866 | return 1; |
867 | } | |
868 | ||
cb6020bb | 869 | int setup_rerere(struct string_list *merge_rr, int flags) |
5b2fd956 SB |
870 | { |
871 | int fd; | |
872 | ||
633e5ad3 | 873 | git_rerere_config(); |
5b2fd956 SB |
874 | if (!is_rerere_enabled()) |
875 | return -1; | |
876 | ||
cb6020bb JH |
877 | if (flags & (RERERE_AUTOUPDATE|RERERE_NOAUTOUPDATE)) |
878 | rerere_autoupdate = !!(flags & RERERE_AUTOUPDATE); | |
9dd330e6 JK |
879 | if (flags & RERERE_READONLY) |
880 | fd = 0; | |
881 | else | |
882 | fd = hold_lock_file_for_update(&write_lock, git_path_merge_rr(), | |
883 | LOCK_DIE_ON_ERROR); | |
5b2fd956 SB |
884 | read_rr(merge_rr); |
885 | return fd; | |
886 | } | |
887 | ||
cc899eca JH |
888 | /* |
889 | * The main entry point that is called internally from codepaths that | |
890 | * perform mergy operations, possibly leaving conflicted index entries | |
891 | * and working tree files. | |
892 | */ | |
cb6020bb | 893 | int rerere(int flags) |
5b2fd956 | 894 | { |
183113a5 | 895 | struct string_list merge_rr = STRING_LIST_INIT_DUP; |
1869bbe1 | 896 | int fd, status; |
5b2fd956 | 897 | |
cb6020bb | 898 | fd = setup_rerere(&merge_rr, flags); |
5b2fd956 SB |
899 | if (fd < 0) |
900 | return 0; | |
1869bbe1 JH |
901 | status = do_plain_rerere(&merge_rr, fd); |
902 | free_rerere_dirs(); | |
903 | return status; | |
5b2fd956 | 904 | } |
dea4562b | 905 | |
3d730ed9 JH |
906 | /* |
907 | * Subclass of rerere_io that reads from an in-core buffer that is a | |
908 | * strbuf | |
909 | */ | |
910 | struct rerere_io_mem { | |
911 | struct rerere_io io; | |
912 | struct strbuf input; | |
913 | }; | |
914 | ||
915 | /* | |
916 | * ... and its getline() method implementation | |
917 | */ | |
918 | static int rerere_mem_getline(struct strbuf *sb, struct rerere_io *io_) | |
919 | { | |
920 | struct rerere_io_mem *io = (struct rerere_io_mem *)io_; | |
921 | char *ep; | |
922 | size_t len; | |
923 | ||
924 | strbuf_release(sb); | |
925 | if (!io->input.len) | |
926 | return -1; | |
927 | ep = memchr(io->input.buf, '\n', io->input.len); | |
928 | if (!ep) | |
929 | ep = io->input.buf + io->input.len; | |
930 | else if (*ep == '\n') | |
931 | ep++; | |
932 | len = ep - io->input.buf; | |
933 | strbuf_add(sb, io->input.buf, len); | |
934 | strbuf_remove(&io->input, 0, len); | |
935 | return 0; | |
936 | } | |
937 | ||
938 | static int handle_cache(const char *path, unsigned char *sha1, const char *output) | |
939 | { | |
940 | mmfile_t mmfile[3] = {{NULL}}; | |
941 | mmbuffer_t result = {NULL, 0}; | |
942 | const struct cache_entry *ce; | |
221444f5 | 943 | int pos, len, i, has_conflicts; |
3d730ed9 JH |
944 | struct rerere_io_mem io; |
945 | int marker_size = ll_merge_marker_size(path); | |
946 | ||
947 | /* | |
948 | * Reproduce the conflicted merge in-core | |
949 | */ | |
950 | len = strlen(path); | |
951 | pos = cache_name_pos(path, len); | |
952 | if (0 <= pos) | |
953 | return -1; | |
954 | pos = -pos - 1; | |
955 | ||
956 | while (pos < active_nr) { | |
957 | enum object_type type; | |
958 | unsigned long size; | |
959 | ||
960 | ce = active_cache[pos++]; | |
961 | if (ce_namelen(ce) != len || memcmp(ce->name, path, len)) | |
962 | break; | |
963 | i = ce_stage(ce) - 1; | |
964 | if (!mmfile[i].ptr) { | |
b4f5aca4 | 965 | mmfile[i].ptr = read_object_file(&ce->oid, &type, |
966 | &size); | |
3d730ed9 JH |
967 | mmfile[i].size = size; |
968 | } | |
969 | } | |
970 | for (i = 0; i < 3; i++) | |
971 | if (!mmfile[i].ptr && !mmfile[i].size) | |
972 | mmfile[i].ptr = xstrdup(""); | |
973 | ||
974 | /* | |
975 | * NEEDSWORK: handle conflicts from merges with | |
976 | * merge.renormalize set, too? | |
977 | */ | |
978 | ll_merge(&result, path, &mmfile[0], NULL, | |
979 | &mmfile[1], "ours", | |
980 | &mmfile[2], "theirs", NULL); | |
981 | for (i = 0; i < 3; i++) | |
982 | free(mmfile[i].ptr); | |
983 | ||
984 | memset(&io, 0, sizeof(io)); | |
985 | io.io.getline = rerere_mem_getline; | |
986 | if (output) | |
987 | io.io.output = fopen(output, "w"); | |
988 | else | |
989 | io.io.output = NULL; | |
990 | strbuf_init(&io.input, 0); | |
991 | strbuf_attach(&io.input, result.ptr, result.size, result.size); | |
992 | ||
993 | /* | |
994 | * Grab the conflict ID and optionally write the original | |
995 | * contents with conflict markers out. | |
996 | */ | |
221444f5 | 997 | has_conflicts = handle_path(sha1, (struct rerere_io *)&io, marker_size); |
3d730ed9 JH |
998 | strbuf_release(&io.input); |
999 | if (io.io.output) | |
1000 | fclose(io.io.output); | |
221444f5 | 1001 | return has_conflicts; |
5b2fd956 | 1002 | } |
dea4562b JH |
1003 | |
1004 | static int rerere_forget_one_path(const char *path, struct string_list *rr) | |
1005 | { | |
1006 | const char *filename; | |
1d51eced | 1007 | struct rerere_id *id; |
dea4562b JH |
1008 | unsigned char sha1[20]; |
1009 | int ret; | |
8d9b5a4a | 1010 | struct string_list_item *item; |
dea4562b | 1011 | |
963ec003 JH |
1012 | /* |
1013 | * Recreate the original conflict from the stages in the | |
1014 | * index and compute the conflict ID | |
1015 | */ | |
dea4562b JH |
1016 | ret = handle_cache(path, sha1, NULL); |
1017 | if (ret < 1) | |
2373b650 | 1018 | return error(_("could not parse conflict hunks in '%s'"), path); |
963ec003 JH |
1019 | |
1020 | /* Nuke the recorded resolution for the conflict */ | |
1d51eced | 1021 | id = new_rerere_id(sha1); |
890fca84 JH |
1022 | |
1023 | for (id->variant = 0; | |
1024 | id->variant < id->collection->status_nr; | |
1025 | id->variant++) { | |
1026 | mmfile_t cur = { NULL, 0 }; | |
1027 | mmbuffer_t result = {NULL, 0}; | |
1028 | int cleanly_resolved; | |
1029 | ||
1030 | if (!has_rerere_resolution(id)) | |
1031 | continue; | |
1032 | ||
1033 | handle_cache(path, sha1, rerere_path(id, "thisimage")); | |
1034 | if (read_mmfile(&cur, rerere_path(id, "thisimage"))) { | |
1035 | free(cur.ptr); | |
2373b650 | 1036 | error(_("failed to update conflicted state in '%s'"), path); |
8f449614 | 1037 | goto fail_exit; |
890fca84 JH |
1038 | } |
1039 | cleanly_resolved = !try_merge(id, path, &cur, &result); | |
1040 | free(result.ptr); | |
1041 | free(cur.ptr); | |
1042 | if (cleanly_resolved) | |
1043 | break; | |
1044 | } | |
1045 | ||
8f449614 | 1046 | if (id->collection->status_nr <= id->variant) { |
2373b650 | 1047 | error(_("no remembered resolution for '%s'"), path); |
8f449614 JH |
1048 | goto fail_exit; |
1049 | } | |
890fca84 | 1050 | |
18bb9934 | 1051 | filename = rerere_path(id, "postimage"); |
8f449614 JH |
1052 | if (unlink(filename)) { |
1053 | if (errno == ENOENT) | |
2373b650 | 1054 | error(_("no remembered resolution for '%s'"), path); |
8f449614 | 1055 | else |
2373b650 | 1056 | error_errno(_("cannot unlink '%s'"), filename); |
8f449614 | 1057 | goto fail_exit; |
d9d501b0 | 1058 | } |
dea4562b | 1059 | |
963ec003 JH |
1060 | /* |
1061 | * Update the preimage so that the user can resolve the | |
1062 | * conflict in the working tree, run us again to record | |
1063 | * the postimage. | |
1064 | */ | |
18bb9934 | 1065 | handle_cache(path, sha1, rerere_path(id, "preimage")); |
2373b650 | 1066 | fprintf_ln(stderr, _("Updated preimage for '%s'"), path); |
dea4562b | 1067 | |
963ec003 JH |
1068 | /* |
1069 | * And remember that we can record resolution for this | |
1070 | * conflict when the user is done. | |
1071 | */ | |
8d9b5a4a | 1072 | item = string_list_insert(rr, path); |
1d51eced | 1073 | free_rerere_id(item); |
18bb9934 | 1074 | item->util = id; |
2373b650 | 1075 | fprintf(stderr, _("Forgot resolution for '%s'\n"), path); |
dea4562b | 1076 | return 0; |
8f449614 JH |
1077 | |
1078 | fail_exit: | |
1079 | free(id); | |
1080 | return -1; | |
dea4562b JH |
1081 | } |
1082 | ||
01a10b0a | 1083 | int rerere_forget(struct pathspec *pathspec) |
dea4562b JH |
1084 | { |
1085 | int i, fd; | |
183113a5 TF |
1086 | struct string_list conflict = STRING_LIST_INIT_DUP; |
1087 | struct string_list merge_rr = STRING_LIST_INIT_DUP; | |
dea4562b JH |
1088 | |
1089 | if (read_cache() < 0) | |
2373b650 | 1090 | return error(_("index file corrupt")); |
dea4562b | 1091 | |
6751e047 | 1092 | fd = setup_rerere(&merge_rr, RERERE_NOAUTOUPDATE); |
0544574c JK |
1093 | if (fd < 0) |
1094 | return 0; | |
dea4562b | 1095 | |
963ec003 JH |
1096 | /* |
1097 | * The paths may have been resolved (incorrectly); | |
1098 | * recover the original conflicted state and then | |
1099 | * find the conflicted paths. | |
1100 | */ | |
dea4562b JH |
1101 | unmerge_cache(pathspec); |
1102 | find_conflict(&conflict); | |
1103 | for (i = 0; i < conflict.nr; i++) { | |
1104 | struct string_list_item *it = &conflict.items[i]; | |
854b0959 | 1105 | if (!match_pathspec(pathspec, it->string, |
ae8d0824 | 1106 | strlen(it->string), 0, NULL, 0)) |
dea4562b JH |
1107 | continue; |
1108 | rerere_forget_one_path(it->string, &merge_rr); | |
1109 | } | |
1110 | return write_rr(&merge_rr, fd); | |
1111 | } | |
0f891e7d | 1112 | |
e828de82 JH |
1113 | /* |
1114 | * Garbage collection support | |
1115 | */ | |
1d51eced | 1116 | |
5ea82279 | 1117 | static timestamp_t rerere_created_at(struct rerere_id *id) |
0f891e7d JH |
1118 | { |
1119 | struct stat st; | |
1d51eced | 1120 | |
18bb9934 | 1121 | return stat(rerere_path(id, "preimage"), &st) ? (time_t) 0 : st.st_mtime; |
0f891e7d JH |
1122 | } |
1123 | ||
5ea82279 | 1124 | static timestamp_t rerere_last_used_at(struct rerere_id *id) |
0f891e7d JH |
1125 | { |
1126 | struct stat st; | |
1d51eced | 1127 | |
18bb9934 | 1128 | return stat(rerere_path(id, "postimage"), &st) ? (time_t) 0 : st.st_mtime; |
0f891e7d JH |
1129 | } |
1130 | ||
e828de82 JH |
1131 | /* |
1132 | * Remove the recorded resolution for a given conflict ID | |
1133 | */ | |
1d51eced | 1134 | static void unlink_rr_item(struct rerere_id *id) |
0f891e7d | 1135 | { |
1be1e851 JH |
1136 | unlink_or_warn(rerere_path(id, "thisimage")); |
1137 | remove_variant(id); | |
1138 | id->collection->status[id->variant] = 0; | |
1139 | } | |
1140 | ||
5ea82279 JH |
1141 | static void prune_one(struct rerere_id *id, |
1142 | timestamp_t cutoff_resolve, timestamp_t cutoff_noresolve) | |
1be1e851 | 1143 | { |
5ea82279 JH |
1144 | timestamp_t then; |
1145 | timestamp_t cutoff; | |
1be1e851 JH |
1146 | |
1147 | then = rerere_last_used_at(id); | |
1148 | if (then) | |
1149 | cutoff = cutoff_resolve; | |
1150 | else { | |
1151 | then = rerere_created_at(id); | |
1152 | if (!then) | |
1153 | return; | |
1154 | cutoff = cutoff_noresolve; | |
1155 | } | |
5ea82279 | 1156 | if (then < cutoff) |
1be1e851 | 1157 | unlink_rr_item(id); |
0f891e7d JH |
1158 | } |
1159 | ||
0f891e7d JH |
1160 | void rerere_gc(struct string_list *rr) |
1161 | { | |
1162 | struct string_list to_remove = STRING_LIST_INIT_DUP; | |
1163 | DIR *dir; | |
1164 | struct dirent *e; | |
1be1e851 | 1165 | int i; |
5ea82279 JH |
1166 | timestamp_t now = time(NULL); |
1167 | timestamp_t cutoff_noresolve = now - 15 * 86400; | |
1168 | timestamp_t cutoff_resolve = now - 60 * 86400; | |
0f891e7d | 1169 | |
9dd330e6 JK |
1170 | if (setup_rerere(rr, 0) < 0) |
1171 | return; | |
1172 | ||
6e96cb52 JH |
1173 | git_config_get_expiry_in_days("gc.rerereresolved", &cutoff_resolve, now); |
1174 | git_config_get_expiry_in_days("gc.rerereunresolved", &cutoff_noresolve, now); | |
633e5ad3 | 1175 | git_config(git_default_config, NULL); |
0f891e7d JH |
1176 | dir = opendir(git_path("rr-cache")); |
1177 | if (!dir) | |
2373b650 | 1178 | die_errno(_("unable to open rr-cache directory")); |
e828de82 | 1179 | /* Collect stale conflict IDs ... */ |
0f891e7d | 1180 | while ((e = readdir(dir))) { |
1be1e851 JH |
1181 | struct rerere_dir *rr_dir; |
1182 | struct rerere_id id; | |
1183 | int now_empty; | |
1184 | ||
0f891e7d JH |
1185 | if (is_dot_or_dotdot(e->d_name)) |
1186 | continue; | |
1be1e851 JH |
1187 | rr_dir = find_rerere_dir(e->d_name); |
1188 | if (!rr_dir) | |
1189 | continue; /* or should we remove e->d_name? */ | |
1190 | ||
1191 | now_empty = 1; | |
1192 | for (id.variant = 0, id.collection = rr_dir; | |
1193 | id.variant < id.collection->status_nr; | |
1194 | id.variant++) { | |
5ea82279 | 1195 | prune_one(&id, cutoff_resolve, cutoff_noresolve); |
1be1e851 JH |
1196 | if (id.collection->status[id.variant]) |
1197 | now_empty = 0; | |
0f891e7d | 1198 | } |
1be1e851 | 1199 | if (now_empty) |
0f891e7d JH |
1200 | string_list_append(&to_remove, e->d_name); |
1201 | } | |
a9930e35 | 1202 | closedir(dir); |
1be1e851 JH |
1203 | |
1204 | /* ... and then remove the empty directories */ | |
0f891e7d | 1205 | for (i = 0; i < to_remove.nr; i++) |
1be1e851 | 1206 | rmdir(git_path("rr-cache/%s", to_remove.items[i].string)); |
0f891e7d | 1207 | string_list_clear(&to_remove, 0); |
9dd330e6 | 1208 | rollback_lock_file(&write_lock); |
0f891e7d JH |
1209 | } |
1210 | ||
e828de82 JH |
1211 | /* |
1212 | * During a conflict resolution, after "rerere" recorded the | |
1213 | * preimages, abandon them if the user did not resolve them or | |
1214 | * record their resolutions. And drop $GIT_DIR/MERGE_RR. | |
1215 | * | |
1216 | * NEEDSWORK: shouldn't we be calling this from "reset --hard"? | |
1217 | */ | |
0f891e7d JH |
1218 | void rerere_clear(struct string_list *merge_rr) |
1219 | { | |
1220 | int i; | |
1221 | ||
9dd330e6 JK |
1222 | if (setup_rerere(merge_rr, 0) < 0) |
1223 | return; | |
1224 | ||
0f891e7d | 1225 | for (i = 0; i < merge_rr->nr; i++) { |
1d51eced | 1226 | struct rerere_id *id = merge_rr->items[i].util; |
1be1e851 | 1227 | if (!has_rerere_resolution(id)) { |
18bb9934 | 1228 | unlink_rr_item(id); |
1be1e851 JH |
1229 | rmdir(rerere_path(id, NULL)); |
1230 | } | |
0f891e7d | 1231 | } |
f932729c | 1232 | unlink_or_warn(git_path_merge_rr()); |
9dd330e6 | 1233 | rollback_lock_file(&write_lock); |
0f891e7d | 1234 | } |