Do a cross-project merge of Paul Mackerras' gitk visualizer
[git/git.git] / fsck-cache.c
1 #include <sys/types.h>
2 #include <dirent.h>
3
4 #include "cache.h"
5 #include "commit.h"
6 #include "tree.h"
7 #include "blob.h"
8 #include "tag.h"
9 #include "delta.h"
10
11 #define REACHABLE 0x0001
12
13 static int show_root = 0;
14 static int show_tags = 0;
15 static int show_unreachable = 0;
16 static int show_max_delta_depth = 0;
17 static int keep_cache_objects = 0;
18 static unsigned char head_sha1[20];
19
20 static void expand_deltas(void)
21 {
22 int i, max_depth = 0;
23
24 /*
25 * To be as efficient as possible we look for delta heads and
26 * recursively process them going backward, and parsing
27 * resulting objects along the way. This allows for processing
28 * each delta objects only once regardless of the delta depth.
29 */
30 for (i = 0; i < nr_objs; i++) {
31 struct object *obj = objs[i];
32 if (obj->parsed && !obj->delta && obj->attached_deltas) {
33 int depth = 0;
34 char type[10];
35 unsigned long size;
36 void *buf = read_sha1_file(obj->sha1, type, &size);
37 if (!buf)
38 continue;
39 depth = process_deltas(buf, size, obj->type,
40 obj->attached_deltas);
41 if (max_depth < depth)
42 max_depth = depth;
43 }
44 }
45 if (show_max_delta_depth)
46 printf("maximum delta depth = %d\n", max_depth);
47 }
48
49 static void check_connectivity(void)
50 {
51 int i;
52
53 /* Look up all the requirements, warn about missing objects.. */
54 for (i = 0; i < nr_objs; i++) {
55 struct object *obj = objs[i];
56 struct object_list *refs;
57
58 if (!obj->parsed) {
59 if (obj->delta)
60 printf("unresolved delta %s\n",
61 sha1_to_hex(obj->sha1));
62 else
63 printf("missing %s %s\n",
64 obj->type, sha1_to_hex(obj->sha1));
65 continue;
66 }
67
68 for (refs = obj->refs; refs; refs = refs->next) {
69 if (refs->item->parsed)
70 continue;
71 printf("broken link from %7s %s\n",
72 obj->type, sha1_to_hex(obj->sha1));
73 printf(" to %7s %s\n",
74 refs->item->type, sha1_to_hex(refs->item->sha1));
75 }
76
77 /* Don't bother with tag reachability. */
78 if (obj->type == tag_type)
79 continue;
80
81 if (show_unreachable && !(obj->flags & REACHABLE)) {
82 if (obj->attached_deltas)
83 printf("foreign delta reference %s\n",
84 sha1_to_hex(obj->sha1));
85 else
86 printf("unreachable %s %s\n",
87 obj->type, sha1_to_hex(obj->sha1));
88 continue;
89 }
90
91 if (!obj->used) {
92 printf("dangling %s %s\n", obj->type,
93 sha1_to_hex(obj->sha1));
94 }
95 }
96 }
97
98 /*
99 * The entries in a tree are ordered in the _path_ order,
100 * which means that a directory entry is ordered by adding
101 * a slash to the end of it.
102 *
103 * So a directory called "a" is ordered _after_ a file
104 * called "a.c", because "a/" sorts after "a.c".
105 */
106 #define TREE_UNORDERED (-1)
107 #define TREE_HAS_DUPS (-2)
108
109 static int verify_ordered(struct tree_entry_list *a, struct tree_entry_list *b)
110 {
111 int len1 = strlen(a->name);
112 int len2 = strlen(b->name);
113 int len = len1 < len2 ? len1 : len2;
114 unsigned char c1, c2;
115 int cmp;
116
117 cmp = memcmp(a->name, b->name, len);
118 if (cmp < 0)
119 return 0;
120 if (cmp > 0)
121 return TREE_UNORDERED;
122
123 /*
124 * Ok, the first <len> characters are the same.
125 * Now we need to order the next one, but turn
126 * a '\0' into a '/' for a directory entry.
127 */
128 c1 = a->name[len];
129 c2 = b->name[len];
130 if (!c1 && !c2)
131 /*
132 * git-write-tree used to write out a nonsense tree that has
133 * entries with the same name, one blob and one tree. Make
134 * sure we do not have duplicate entries.
135 */
136 return TREE_HAS_DUPS;
137 if (!c1 && a->directory)
138 c1 = '/';
139 if (!c2 && b->directory)
140 c2 = '/';
141 return c1 < c2 ? 0 : TREE_UNORDERED;
142 }
143
144 static int fsck_tree(struct tree *item)
145 {
146 int has_full_path = 0;
147 struct tree_entry_list *entry, *last;
148
149 last = NULL;
150 for (entry = item->entries; entry; entry = entry->next) {
151 if (strchr(entry->name, '/'))
152 has_full_path = 1;
153
154 switch (entry->mode) {
155 /*
156 * Standard modes..
157 */
158 case S_IFREG | 0755:
159 case S_IFREG | 0644:
160 case S_IFLNK:
161 case S_IFDIR:
162 break;
163 /*
164 * This is nonstandard, but we had a few of these
165 * early on when we honored the full set of mode
166 * bits..
167 */
168 case S_IFREG | 0664:
169 break;
170 default:
171 printf("tree %s has entry %o %s\n",
172 sha1_to_hex(item->object.sha1),
173 entry->mode, entry->name);
174 }
175
176 if (last) {
177 switch (verify_ordered(last, entry)) {
178 case TREE_UNORDERED:
179 fprintf(stderr, "tree %s not ordered\n",
180 sha1_to_hex(item->object.sha1));
181 return -1;
182 case TREE_HAS_DUPS:
183 fprintf(stderr, "tree %s has duplicate entries for '%s'\n",
184 sha1_to_hex(item->object.sha1),
185 entry->name);
186 return -1;
187 default:
188 break;
189 }
190 }
191
192 last = entry;
193 }
194
195 if (has_full_path) {
196 fprintf(stderr, "warning: git-fsck-cache: tree %s "
197 "has full pathnames in it\n",
198 sha1_to_hex(item->object.sha1));
199 }
200
201 return 0;
202 }
203
204 static int fsck_commit(struct commit *commit)
205 {
206 free(commit->buffer);
207 commit->buffer = NULL;
208 if (!commit->tree)
209 return -1;
210 if (!commit->parents && show_root)
211 printf("root %s\n", sha1_to_hex(commit->object.sha1));
212 if (!commit->date)
213 printf("bad commit date in %s\n",
214 sha1_to_hex(commit->object.sha1));
215 return 0;
216 }
217
218 static int fsck_tag(struct tag *tag)
219 {
220 struct object *tagged = tag->tagged;
221
222 if (!tagged) {
223 printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
224 return -1;
225 }
226 if (!show_tags)
227 return 0;
228
229 printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
230 printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
231 return 0;
232 }
233
234 static int fsck_sha1(unsigned char *sha1)
235 {
236 struct object *obj = parse_object(sha1);
237 if (!obj)
238 return -1;
239 if (obj->type == blob_type)
240 return 0;
241 if (obj->type == tree_type)
242 return fsck_tree((struct tree *) obj);
243 if (obj->type == commit_type)
244 return fsck_commit((struct commit *) obj);
245 if (obj->type == tag_type)
246 return fsck_tag((struct tag *) obj);
247 if (!obj->type && obj->delta)
248 return 0;
249 return -1;
250 }
251
252 /*
253 * This is the sorting chunk size: make it reasonably
254 * big so that we can sort well..
255 */
256 #define MAX_SHA1_ENTRIES (1024)
257
258 struct sha1_entry {
259 unsigned long ino;
260 unsigned char sha1[20];
261 };
262
263 static struct {
264 unsigned long nr;
265 struct sha1_entry *entry[MAX_SHA1_ENTRIES];
266 } sha1_list;
267
268 static int ino_compare(const void *_a, const void *_b)
269 {
270 const struct sha1_entry *a = _a, *b = _b;
271 unsigned long ino1 = a->ino, ino2 = b->ino;
272 return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
273 }
274
275 static void fsck_sha1_list(void)
276 {
277 int i, nr = sha1_list.nr;
278
279 qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
280 for (i = 0; i < nr; i++) {
281 struct sha1_entry *entry = sha1_list.entry[i];
282 unsigned char *sha1 = entry->sha1;
283
284 sha1_list.entry[i] = NULL;
285 if (fsck_sha1(sha1) < 0)
286 fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
287 free(entry);
288 }
289 sha1_list.nr = 0;
290 }
291
292 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
293 {
294 struct sha1_entry *entry = xmalloc(sizeof(*entry));
295 int nr;
296
297 entry->ino = ino;
298 memcpy(entry->sha1, sha1, 20);
299 nr = sha1_list.nr;
300 if (nr == MAX_SHA1_ENTRIES) {
301 fsck_sha1_list();
302 nr = 0;
303 }
304 sha1_list.entry[nr] = entry;
305 sha1_list.nr = ++nr;
306 }
307
308 static int fsck_dir(int i, char *path)
309 {
310 DIR *dir = opendir(path);
311 struct dirent *de;
312
313 if (!dir) {
314 return error("missing sha1 directory '%s'", path);
315 }
316
317 while ((de = readdir(dir)) != NULL) {
318 char name[100];
319 unsigned char sha1[20];
320 int len = strlen(de->d_name);
321
322 switch (len) {
323 case 2:
324 if (de->d_name[1] != '.')
325 break;
326 case 1:
327 if (de->d_name[0] != '.')
328 break;
329 continue;
330 case 38:
331 sprintf(name, "%02x", i);
332 memcpy(name+2, de->d_name, len+1);
333 if (get_sha1_hex(name, sha1) < 0)
334 break;
335 add_sha1_list(sha1, de->d_ino);
336 continue;
337 }
338 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
339 }
340 closedir(dir);
341 return 0;
342 }
343
344 static int read_sha1_reference(const char *path)
345 {
346 char hexname[60];
347 unsigned char sha1[20];
348 int fd = open(path, O_RDONLY), len;
349 struct object *obj;
350
351 if (fd < 0)
352 return -1;
353
354 len = read(fd, hexname, sizeof(hexname));
355 close(fd);
356 if (len < 40)
357 return -1;
358
359 if (get_sha1_hex(hexname, sha1) < 0)
360 return -1;
361
362 obj = lookup_object(sha1);
363 if (!obj)
364 return error("%s: invalid sha1 pointer %.40s", path, hexname);
365
366 obj->used = 1;
367 mark_reachable(obj, REACHABLE);
368 return 0;
369 }
370
371 static int find_file_objects(const char *base, const char *name)
372 {
373 int baselen = strlen(base);
374 int namelen = strlen(name);
375 char *path = xmalloc(baselen + namelen + 2);
376 struct stat st;
377
378 memcpy(path, base, baselen);
379 path[baselen] = '/';
380 memcpy(path + baselen + 1, name, namelen+1);
381 if (stat(path, &st) < 0)
382 return 0;
383
384 /*
385 * Recurse into directories
386 */
387 if (S_ISDIR(st.st_mode)) {
388 int count = 0;
389 DIR *dir = opendir(path);
390 if (dir) {
391 struct dirent *de;
392 while ((de = readdir(dir)) != NULL) {
393 if (de->d_name[0] == '.')
394 continue;
395 count += find_file_objects(path, de->d_name);
396 }
397 closedir(dir);
398 }
399 return count;
400 }
401 if (S_ISREG(st.st_mode))
402 return read_sha1_reference(path) == 0;
403 return 0;
404 }
405
406 static void get_default_heads(void)
407 {
408 char *git_dir = gitenv(GIT_DIR_ENVIRONMENT) ? : DEFAULT_GIT_DIR_ENVIRONMENT;
409 int count = find_file_objects(git_dir, "refs");
410 if (!count)
411 die("No default references");
412 }
413
414 int main(int argc, char **argv)
415 {
416 int i, heads;
417 char *sha1_dir;
418
419 for (i = 1; i < argc; i++) {
420 const char *arg = argv[i];
421
422 if (!strcmp(arg, "--unreachable")) {
423 show_unreachable = 1;
424 continue;
425 }
426 if (!strcmp(arg, "--tags")) {
427 show_tags = 1;
428 continue;
429 }
430 if (!strcmp(arg, "--root")) {
431 show_root = 1;
432 continue;
433 }
434 if (!strcmp(arg, "--delta-depth")) {
435 show_max_delta_depth = 1;
436 continue;
437 }
438 if (!strcmp(arg, "--cache")) {
439 keep_cache_objects = 1;
440 continue;
441 }
442 if (*arg == '-')
443 usage("git-fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
444 }
445
446 sha1_dir = get_object_directory();
447 for (i = 0; i < 256; i++) {
448 static char dir[4096];
449 sprintf(dir, "%s/%02x", sha1_dir, i);
450 fsck_dir(i, dir);
451 }
452 fsck_sha1_list();
453
454 expand_deltas();
455
456 heads = 0;
457 for (i = 1; i < argc; i++) {
458 const char *arg = argv[i];
459
460 if (*arg == '-')
461 continue;
462
463 if (!get_sha1(arg, head_sha1)) {
464 struct object *obj = lookup_object(head_sha1);
465
466 /* Error is printed by lookup_object(). */
467 if (!obj)
468 continue;
469
470 obj->used = 1;
471 mark_reachable(obj, REACHABLE);
472 heads++;
473 continue;
474 }
475 error("expected sha1, got %s", arg);
476 }
477
478 /*
479 * If we've not been given any explicit head information, do the
480 * default ones from .git/refs. We also consider the index file
481 * in this case (ie this implies --cache).
482 */
483 if (!heads) {
484 get_default_heads();
485 keep_cache_objects = 1;
486 }
487
488 if (keep_cache_objects) {
489 int i;
490 read_cache();
491 for (i = 0; i < active_nr; i++) {
492 struct blob *blob = lookup_blob(active_cache[i]->sha1);
493 struct object *obj;
494 if (!blob)
495 continue;
496 obj = &blob->object;
497 obj->used = 1;
498 mark_reachable(obj, REACHABLE);
499 }
500 }
501
502 check_connectivity();
503 return 0;
504 }