Merge branch 'jn/gitweb-grep'
[git/git.git] / builtin-reflog.c
1 #include "cache.h"
2 #include "builtin.h"
3 #include "commit.h"
4 #include "refs.h"
5 #include "dir.h"
6 #include "tree-walk.h"
7 #include "diff.h"
8 #include "revision.h"
9 #include "reachable.h"
10
11 /*
12 * reflog expire
13 */
14
15 static const char reflog_expire_usage[] =
16 "git-reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
17
18 static unsigned long default_reflog_expire;
19 static unsigned long default_reflog_expire_unreachable;
20
21 struct cmd_reflog_expire_cb {
22 struct rev_info revs;
23 int dry_run;
24 int stalefix;
25 int verbose;
26 unsigned long expire_total;
27 unsigned long expire_unreachable;
28 };
29
30 struct expire_reflog_cb {
31 FILE *newlog;
32 const char *ref;
33 struct commit *ref_commit;
34 struct cmd_reflog_expire_cb *cmd;
35 };
36
37 struct collected_reflog {
38 unsigned char sha1[20];
39 char reflog[FLEX_ARRAY];
40 };
41 struct collect_reflog_cb {
42 struct collected_reflog **e;
43 int alloc;
44 int nr;
45 };
46
47 #define INCOMPLETE (1u<<10)
48 #define STUDYING (1u<<11)
49
50 static int tree_is_complete(const unsigned char *sha1)
51 {
52 struct tree_desc desc;
53 struct name_entry entry;
54 int complete;
55 struct tree *tree;
56
57 tree = lookup_tree(sha1);
58 if (!tree)
59 return 0;
60 if (tree->object.flags & SEEN)
61 return 1;
62 if (tree->object.flags & INCOMPLETE)
63 return 0;
64
65 if (!tree->buffer) {
66 enum object_type type;
67 unsigned long size;
68 void *data = read_sha1_file(sha1, &type, &size);
69 if (!data) {
70 tree->object.flags |= INCOMPLETE;
71 return 0;
72 }
73 tree->buffer = data;
74 tree->size = size;
75 }
76 init_tree_desc(&desc, tree->buffer, tree->size);
77 complete = 1;
78 while (tree_entry(&desc, &entry)) {
79 if (!has_sha1_file(entry.sha1) ||
80 (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
81 tree->object.flags |= INCOMPLETE;
82 complete = 0;
83 }
84 }
85 free(tree->buffer);
86 tree->buffer = NULL;
87
88 if (complete)
89 tree->object.flags |= SEEN;
90 return complete;
91 }
92
93 static int commit_is_complete(struct commit *commit)
94 {
95 struct object_array study;
96 struct object_array found;
97 int is_incomplete = 0;
98 int i;
99
100 /* early return */
101 if (commit->object.flags & SEEN)
102 return 1;
103 if (commit->object.flags & INCOMPLETE)
104 return 0;
105 /*
106 * Find all commits that are reachable and are not marked as
107 * SEEN. Then make sure the trees and blobs contained are
108 * complete. After that, mark these commits also as SEEN.
109 * If some of the objects that are needed to complete this
110 * commit are missing, mark this commit as INCOMPLETE.
111 */
112 memset(&study, 0, sizeof(study));
113 memset(&found, 0, sizeof(found));
114 add_object_array(&commit->object, NULL, &study);
115 add_object_array(&commit->object, NULL, &found);
116 commit->object.flags |= STUDYING;
117 while (study.nr) {
118 struct commit *c;
119 struct commit_list *parent;
120
121 c = (struct commit *)study.objects[--study.nr].item;
122 if (!c->object.parsed && !parse_object(c->object.sha1))
123 c->object.flags |= INCOMPLETE;
124
125 if (c->object.flags & INCOMPLETE) {
126 is_incomplete = 1;
127 break;
128 }
129 else if (c->object.flags & SEEN)
130 continue;
131 for (parent = c->parents; parent; parent = parent->next) {
132 struct commit *p = parent->item;
133 if (p->object.flags & STUDYING)
134 continue;
135 p->object.flags |= STUDYING;
136 add_object_array(&p->object, NULL, &study);
137 add_object_array(&p->object, NULL, &found);
138 }
139 }
140 if (!is_incomplete) {
141 /*
142 * make sure all commits in "found" array have all the
143 * necessary objects.
144 */
145 for (i = 0; i < found.nr; i++) {
146 struct commit *c =
147 (struct commit *)found.objects[i].item;
148 if (!tree_is_complete(c->tree->object.sha1)) {
149 is_incomplete = 1;
150 c->object.flags |= INCOMPLETE;
151 }
152 }
153 if (!is_incomplete) {
154 /* mark all found commits as complete, iow SEEN */
155 for (i = 0; i < found.nr; i++)
156 found.objects[i].item->flags |= SEEN;
157 }
158 }
159 /* clear flags from the objects we traversed */
160 for (i = 0; i < found.nr; i++)
161 found.objects[i].item->flags &= ~STUDYING;
162 if (is_incomplete)
163 commit->object.flags |= INCOMPLETE;
164 else {
165 /*
166 * If we come here, we have (1) traversed the ancestry chain
167 * from the "commit" until we reach SEEN commits (which are
168 * known to be complete), and (2) made sure that the commits
169 * encountered during the above traversal refer to trees that
170 * are complete. Which means that we know *all* the commits
171 * we have seen during this process are complete.
172 */
173 for (i = 0; i < found.nr; i++)
174 found.objects[i].item->flags |= SEEN;
175 }
176 /* free object arrays */
177 free(study.objects);
178 free(found.objects);
179 return !is_incomplete;
180 }
181
182 static int keep_entry(struct commit **it, unsigned char *sha1)
183 {
184 struct commit *commit;
185
186 if (is_null_sha1(sha1))
187 return 1;
188 commit = lookup_commit_reference_gently(sha1, 1);
189 if (!commit)
190 return 0;
191
192 /*
193 * Make sure everything in this commit exists.
194 *
195 * We have walked all the objects reachable from the refs
196 * and cache earlier. The commits reachable by this commit
197 * must meet SEEN commits -- and then we should mark them as
198 * SEEN as well.
199 */
200 if (!commit_is_complete(commit))
201 return 0;
202 *it = commit;
203 return 1;
204 }
205
206 static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
207 const char *email, unsigned long timestamp, int tz,
208 const char *message, void *cb_data)
209 {
210 struct expire_reflog_cb *cb = cb_data;
211 struct commit *old, *new;
212
213 if (timestamp < cb->cmd->expire_total)
214 goto prune;
215
216 old = new = NULL;
217 if (cb->cmd->stalefix &&
218 (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
219 goto prune;
220
221 if (timestamp < cb->cmd->expire_unreachable) {
222 if (!cb->ref_commit)
223 goto prune;
224 if (!old && !is_null_sha1(osha1))
225 old = lookup_commit_reference_gently(osha1, 1);
226 if (!new && !is_null_sha1(nsha1))
227 new = lookup_commit_reference_gently(nsha1, 1);
228 if ((old && !in_merge_bases(old, &cb->ref_commit, 1)) ||
229 (new && !in_merge_bases(new, &cb->ref_commit, 1)))
230 goto prune;
231 }
232
233 if (cb->newlog) {
234 char sign = (tz < 0) ? '-' : '+';
235 int zone = (tz < 0) ? (-tz) : tz;
236 fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
237 sha1_to_hex(osha1), sha1_to_hex(nsha1),
238 email, timestamp, sign, zone,
239 message);
240 }
241 if (cb->cmd->verbose)
242 printf("keep %s", message);
243 return 0;
244 prune:
245 if (!cb->newlog || cb->cmd->verbose)
246 printf("%sprune %s", cb->newlog ? "" : "would ", message);
247 return 0;
248 }
249
250 static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
251 {
252 struct cmd_reflog_expire_cb *cmd = cb_data;
253 struct expire_reflog_cb cb;
254 struct ref_lock *lock;
255 char *log_file, *newlog_path = NULL;
256 int status = 0;
257
258 memset(&cb, 0, sizeof(cb));
259 /* we take the lock for the ref itself to prevent it from
260 * getting updated.
261 */
262 lock = lock_any_ref_for_update(ref, sha1, 0);
263 if (!lock)
264 return error("cannot lock ref '%s'", ref);
265 log_file = xstrdup(git_path("logs/%s", ref));
266 if (!file_exists(log_file))
267 goto finish;
268 if (!cmd->dry_run) {
269 newlog_path = xstrdup(git_path("logs/%s.lock", ref));
270 cb.newlog = fopen(newlog_path, "w");
271 }
272
273 cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
274 cb.ref = ref;
275 cb.cmd = cmd;
276 for_each_reflog_ent(ref, expire_reflog_ent, &cb);
277 finish:
278 if (cb.newlog) {
279 if (fclose(cb.newlog)) {
280 status |= error("%s: %s", strerror(errno),
281 newlog_path);
282 unlink(newlog_path);
283 } else if (rename(newlog_path, log_file)) {
284 status |= error("cannot rename %s to %s",
285 newlog_path, log_file);
286 unlink(newlog_path);
287 }
288 }
289 free(newlog_path);
290 free(log_file);
291 unlock_ref(lock);
292 return status;
293 }
294
295 static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
296 {
297 struct collected_reflog *e;
298 struct collect_reflog_cb *cb = cb_data;
299 size_t namelen = strlen(ref);
300
301 e = xmalloc(sizeof(*e) + namelen + 1);
302 hashcpy(e->sha1, sha1);
303 memcpy(e->reflog, ref, namelen + 1);
304 ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
305 cb->e[cb->nr++] = e;
306 return 0;
307 }
308
309 static int reflog_expire_config(const char *var, const char *value)
310 {
311 if (!strcmp(var, "gc.reflogexpire")) {
312 if (!value)
313 config_error_nonbool(var);
314 default_reflog_expire = approxidate(value);
315 return 0;
316 }
317 if (!strcmp(var, "gc.reflogexpireunreachable")) {
318 if (!value)
319 config_error_nonbool(var);
320 default_reflog_expire_unreachable = approxidate(value);
321 return 0;
322 }
323 return git_default_config(var, value);
324 }
325
326 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
327 {
328 struct cmd_reflog_expire_cb cb;
329 unsigned long now = time(NULL);
330 int i, status, do_all;
331
332 git_config(reflog_expire_config);
333
334 save_commit_buffer = 0;
335 do_all = status = 0;
336 memset(&cb, 0, sizeof(cb));
337
338 if (!default_reflog_expire_unreachable)
339 default_reflog_expire_unreachable = now - 30 * 24 * 3600;
340 if (!default_reflog_expire)
341 default_reflog_expire = now - 90 * 24 * 3600;
342 cb.expire_total = default_reflog_expire;
343 cb.expire_unreachable = default_reflog_expire_unreachable;
344
345 /*
346 * We can trust the commits and objects reachable from refs
347 * even in older repository. We cannot trust what's reachable
348 * from reflog if the repository was pruned with older git.
349 */
350
351 for (i = 1; i < argc; i++) {
352 const char *arg = argv[i];
353 if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
354 cb.dry_run = 1;
355 else if (!prefixcmp(arg, "--expire="))
356 cb.expire_total = approxidate(arg + 9);
357 else if (!prefixcmp(arg, "--expire-unreachable="))
358 cb.expire_unreachable = approxidate(arg + 21);
359 else if (!strcmp(arg, "--stale-fix"))
360 cb.stalefix = 1;
361 else if (!strcmp(arg, "--all"))
362 do_all = 1;
363 else if (!strcmp(arg, "--verbose"))
364 cb.verbose = 1;
365 else if (!strcmp(arg, "--")) {
366 i++;
367 break;
368 }
369 else if (arg[0] == '-')
370 usage(reflog_expire_usage);
371 else
372 break;
373 }
374 if (cb.stalefix) {
375 init_revisions(&cb.revs, prefix);
376 if (cb.verbose)
377 printf("Marking reachable objects...");
378 mark_reachable_objects(&cb.revs, 0);
379 if (cb.verbose)
380 putchar('\n');
381 }
382
383 if (do_all) {
384 struct collect_reflog_cb collected;
385 int i;
386
387 memset(&collected, 0, sizeof(collected));
388 for_each_reflog(collect_reflog, &collected);
389 for (i = 0; i < collected.nr; i++) {
390 struct collected_reflog *e = collected.e[i];
391 status |= expire_reflog(e->reflog, e->sha1, 0, &cb);
392 free(e);
393 }
394 free(collected.e);
395 }
396
397 while (i < argc) {
398 const char *ref = argv[i++];
399 unsigned char sha1[20];
400 if (!resolve_ref(ref, sha1, 1, NULL)) {
401 status |= error("%s points nowhere!", ref);
402 continue;
403 }
404 status |= expire_reflog(ref, sha1, 0, &cb);
405 }
406 return status;
407 }
408
409 /*
410 * main "reflog"
411 */
412
413 static const char reflog_usage[] =
414 "git-reflog (expire | ...)";
415
416 int cmd_reflog(int argc, const char **argv, const char *prefix)
417 {
418 /* With no command, we default to showing it. */
419 if (argc < 2 || *argv[1] == '-')
420 return cmd_log_reflog(argc, argv, prefix);
421
422 if (!strcmp(argv[1], "show"))
423 return cmd_log_reflog(argc - 1, argv + 1, prefix);
424
425 if (!strcmp(argv[1], "expire"))
426 return cmd_reflog_expire(argc - 1, argv + 1, prefix);
427
428 /* Not a recognized reflog command..*/
429 usage(reflog_usage);
430 }