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 "refs.h"
10#include "pack.h"
11
12#define REACHABLE 0x0001
13
14static int show_root = 0;
15static int show_tags = 0;
16static int show_unreachable = 0;
17static int standalone = 0;
18static int check_full = 0;
19static int check_strict = 0;
20static int keep_cache_objects = 0;
21static unsigned char head_sha1[20];
22
23static void check_connectivity(void)
24{
25 int i;
26
27 /* Look up all the requirements, warn about missing objects.. */
28 for (i = 0; i < nr_objs; i++) {
29 struct object *obj = objs[i];
30 struct object_list *refs;
31
32 if (!obj->parsed) {
33 if (!standalone && has_sha1_file(obj->sha1))
34 ; /* it is in pack */
35 else
36 printf("missing %s %s\n",
37 obj->type, sha1_to_hex(obj->sha1));
38 continue;
39 }
40
41 for (refs = obj->refs; refs; refs = refs->next) {
42 if (refs->item->parsed ||
43 (!standalone && has_sha1_file(refs->item->sha1)))
44 continue;
45 printf("broken link from %7s %s\n",
46 obj->type, sha1_to_hex(obj->sha1));
47 printf(" to %7s %s\n",
48 refs->item->type, sha1_to_hex(refs->item->sha1));
49 }
50
51 if (show_unreachable && !(obj->flags & REACHABLE)) {
52 printf("unreachable %s %s\n",
53 obj->type, sha1_to_hex(obj->sha1));
54 continue;
55 }
56
57 if (!obj->used) {
58 printf("dangling %s %s\n", obj->type,
59 sha1_to_hex(obj->sha1));
60 }
61 }
62}
63
64/*
65 * The entries in a tree are ordered in the _path_ order,
66 * which means that a directory entry is ordered by adding
67 * a slash to the end of it.
68 *
69 * So a directory called "a" is ordered _after_ a file
70 * called "a.c", because "a/" sorts after "a.c".
71 */
72#define TREE_UNORDERED (-1)
73#define TREE_HAS_DUPS (-2)
74
75static int verify_ordered(struct tree_entry_list *a, struct tree_entry_list *b)
76{
77 int len1 = strlen(a->name);
78 int len2 = strlen(b->name);
79 int len = len1 < len2 ? len1 : len2;
80 unsigned char c1, c2;
81 int cmp;
82
83 cmp = memcmp(a->name, b->name, len);
84 if (cmp < 0)
85 return 0;
86 if (cmp > 0)
87 return TREE_UNORDERED;
88
89 /*
90 * Ok, the first <len> characters are the same.
91 * Now we need to order the next one, but turn
92 * a '\0' into a '/' for a directory entry.
93 */
94 c1 = a->name[len];
95 c2 = b->name[len];
96 if (!c1 && !c2)
97 /*
98 * git-write-tree used to write out a nonsense tree that has
99 * entries with the same name, one blob and one tree. Make
100 * sure we do not have duplicate entries.
101 */
102 return TREE_HAS_DUPS;
103 if (!c1 && a->directory)
104 c1 = '/';
105 if (!c2 && b->directory)
106 c2 = '/';
107 return c1 < c2 ? 0 : TREE_UNORDERED;
108}
109
110static int fsck_tree(struct tree *item)
111{
112 int retval;
113 int has_full_path = 0;
114 int has_zero_pad = 0;
115 int has_bad_modes = 0;
116 int has_dup_entries = 0;
117 int not_properly_sorted = 0;
118 struct tree_entry_list *entry, *last;
119
120 last = NULL;
121 for (entry = item->entries; entry; entry = entry->next) {
122 if (strchr(entry->name, '/'))
123 has_full_path = 1;
124 has_zero_pad |= entry->zeropad;
125
126 switch (entry->mode) {
127 /*
128 * Standard modes..
129 */
130 case S_IFREG | 0755:
131 case S_IFREG | 0644:
132 case S_IFLNK:
133 case S_IFDIR:
134 break;
135 /*
136 * This is nonstandard, but we had a few of these
137 * early on when we honored the full set of mode
138 * bits..
139 */
140 case S_IFREG | 0664:
141 if (!check_strict)
142 break;
143 default:
144 has_bad_modes = 1;
145 }
146
147 if (last) {
148 switch (verify_ordered(last, entry)) {
149 case TREE_UNORDERED:
150 not_properly_sorted = 1;
151 break;
152 case TREE_HAS_DUPS:
153 has_dup_entries = 1;
154 break;
155 default:
156 break;
157 }
158 }
159
160 last = entry;
161 }
162
163 retval = 0;
164 if (has_full_path) {
165 fprintf(stderr, "warning: git-fsck-objects: tree %s "
166 "has full pathnames in it\n",
167 sha1_to_hex(item->object.sha1));
168 }
169 if (has_zero_pad) {
170 fprintf(stderr, "warning: git-fsck-objects: tree %s "
171 "has zero-padded file modes in it\n",
172 sha1_to_hex(item->object.sha1));
173 }
174 if (has_bad_modes) {
175 fprintf(stderr, "warning: git-fsck-objects: tree %s "
176 "has bad file modes in it\n",
177 sha1_to_hex(item->object.sha1));
178 }
179 if (has_dup_entries) {
180 fprintf(stderr, "error: git-fsck-objects: tree %s "
181 "has duplicate file entries\n",
182 sha1_to_hex(item->object.sha1));
183 retval = -1;
184 }
185 if (not_properly_sorted) {
186 fprintf(stderr, "error: git-fsck-objects: tree %s "
187 "is not properly sorted\n",
188 sha1_to_hex(item->object.sha1));
189 retval = -1;
190 }
191 return retval;
192}
193
194static int fsck_commit(struct commit *commit)
195{
196 char *buffer = commit->buffer;
197 unsigned char sha1[20];
198
199 if (memcmp(buffer, "tree ", 5))
200 return -1;
201 if (get_sha1_hex(buffer+5, sha1) || buffer[45] != '\n')
202 return -1;
203 buffer += 46;
204 while (!memcmp(buffer, "parent ", 7)) {
205 if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
206 return -1;
207 buffer += 48;
208 }
209 if (memcmp(buffer, "author ", 7))
210 return -1;
211 free(commit->buffer);
212 commit->buffer = NULL;
213 if (!commit->tree)
214 return -1;
215 if (!commit->parents && show_root)
216 printf("root %s\n", sha1_to_hex(commit->object.sha1));
217 if (!commit->date)
218 printf("bad commit date in %s\n",
219 sha1_to_hex(commit->object.sha1));
220 return 0;
221}
222
223static int fsck_tag(struct tag *tag)
224{
225 struct object *tagged = tag->tagged;
226
227 if (!tagged) {
228 printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
229 return -1;
230 }
231 if (!show_tags)
232 return 0;
233
234 printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
235 printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
236 return 0;
237}
238
239static int fsck_sha1(unsigned char *sha1)
240{
241 struct object *obj = parse_object(sha1);
242 if (!obj)
243 return -1;
244 if (obj->type == blob_type)
245 return 0;
246 if (obj->type == tree_type)
247 return fsck_tree((struct tree *) obj);
248 if (obj->type == commit_type)
249 return fsck_commit((struct commit *) obj);
250 if (obj->type == tag_type)
251 return fsck_tag((struct tag *) obj);
252 return -1;
253}
254
255/*
256 * This is the sorting chunk size: make it reasonably
257 * big so that we can sort well..
258 */
259#define MAX_SHA1_ENTRIES (1024)
260
261struct sha1_entry {
262 unsigned long ino;
263 unsigned char sha1[20];
264};
265
266static struct {
267 unsigned long nr;
268 struct sha1_entry *entry[MAX_SHA1_ENTRIES];
269} sha1_list;
270
271static int ino_compare(const void *_a, const void *_b)
272{
273 const struct sha1_entry *a = _a, *b = _b;
274 unsigned long ino1 = a->ino, ino2 = b->ino;
275 return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
276}
277
278static void fsck_sha1_list(void)
279{
280 int i, nr = sha1_list.nr;
281
282 qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
283 for (i = 0; i < nr; i++) {
284 struct sha1_entry *entry = sha1_list.entry[i];
285 unsigned char *sha1 = entry->sha1;
286
287 sha1_list.entry[i] = NULL;
288 if (fsck_sha1(sha1) < 0)
289 fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
290 free(entry);
291 }
292 sha1_list.nr = 0;
293}
294
295static void add_sha1_list(unsigned char *sha1, unsigned long ino)
296{
297 struct sha1_entry *entry = xmalloc(sizeof(*entry));
298 int nr;
299
300 entry->ino = ino;
301 memcpy(entry->sha1, sha1, 20);
302 nr = sha1_list.nr;
303 if (nr == MAX_SHA1_ENTRIES) {
304 fsck_sha1_list();
305 nr = 0;
306 }
307 sha1_list.entry[nr] = entry;
308 sha1_list.nr = ++nr;
309}
310
311static int fsck_dir(int i, char *path)
312{
313 DIR *dir = opendir(path);
314 struct dirent *de;
315
316 if (!dir) {
317 return error("missing sha1 directory '%s'", path);
318 }
319
320 while ((de = readdir(dir)) != NULL) {
321 char name[100];
322 unsigned char sha1[20];
323 int len = strlen(de->d_name);
324
325 switch (len) {
326 case 2:
327 if (de->d_name[1] != '.')
328 break;
329 case 1:
330 if (de->d_name[0] != '.')
331 break;
332 continue;
333 case 38:
334 sprintf(name, "%02x", i);
335 memcpy(name+2, de->d_name, len+1);
336 if (get_sha1_hex(name, sha1) < 0)
337 break;
338 add_sha1_list(sha1, de->d_ino);
339 continue;
340 }
341 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
342 }
343 closedir(dir);
344 return 0;
345}
346
347static int default_refs = 0;
348
349static int fsck_handle_ref(const char *refname, const unsigned char *sha1)
350{
351 struct object *obj;
352
353 obj = lookup_object(sha1);
354 if (!obj) {
355 if (!standalone && has_sha1_file(sha1)) {
356 default_refs++;
357 return 0; /* it is in a pack */
358 }
359 error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
360 /* We'll continue with the rest despite the error.. */
361 return 0;
362 }
363 default_refs++;
364 obj->used = 1;
365 mark_reachable(obj, REACHABLE);
366 return 0;
367}
368
369static void get_default_heads(void)
370{
371 for_each_ref(fsck_handle_ref);
372 if (!default_refs)
373 die("No default references");
374}
375
376static void fsck_object_dir(const char *path)
377{
378 int i;
379 for (i = 0; i < 256; i++) {
380 static char dir[4096];
381 sprintf(dir, "%s/%02x", path, i);
382 fsck_dir(i, dir);
383 }
384 fsck_sha1_list();
385}
386
387static int fsck_head_link(void)
388{
389 int fd, count;
390 char hex[40];
391 unsigned char sha1[20];
392 static char path[PATH_MAX], link[PATH_MAX];
393 const char *git_dir;
394
395 git_dir = getenv(GIT_DIR_ENVIRONMENT);
396 if (!git_dir) git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
397
398 snprintf(path, sizeof(path), "%s/HEAD", git_dir);
399 if (readlink(path, link, sizeof(link)) < 0)
400 return error("HEAD is not a symlink");
401 if (strncmp("refs/heads/", link, 11))
402 return error("HEAD points to something strange (%s)", link);
403 fd = open(path, O_RDONLY);
404 if (fd < 0)
405 return error("HEAD: %s", strerror(errno));
406 count = read(fd, hex, sizeof(hex));
407 close(fd);
408 if (count < 0)
409 return error("HEAD: %s", strerror(errno));
410 if (count < 40 || get_sha1_hex(hex, sha1))
411 return error("HEAD: not a valid git pointer");
412 return 0;
413}
414
415int main(int argc, char **argv)
416{
417 int i, heads;
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, "--cache")) {
435 keep_cache_objects = 1;
436 continue;
437 }
438 if (!strcmp(arg, "--standalone")) {
439 standalone = 1;
440 continue;
441 }
442 if (!strcmp(arg, "--full")) {
443 check_full = 1;
444 continue;
445 }
446 if (!strcmp(arg, "--strict")) {
447 check_strict = 1;
448 continue;
449 }
450 if (*arg == '-')
451 usage("git-fsck-objects [--tags] [--root] [[--unreachable] [--cache] [--standalone | --full] [--strict] <head-sha1>*]");
452 }
453
454 if (standalone && check_full)
455 die("Only one of --standalone or --full can be used.");
456 if (standalone)
457 putenv("GIT_ALTERNATE_OBJECT_DIRECTORIES=");
458
459 fsck_head_link();
460 fsck_object_dir(get_object_directory());
461 if (check_full) {
462 struct alternate_object_database *alt;
463 struct packed_git *p;
464 prepare_alt_odb();
465 for (alt = alt_odb_list; alt; alt = alt->next) {
466 char namebuf[PATH_MAX];
467 int namelen = alt->name - alt->base;
468 memcpy(namebuf, alt->base, namelen);
469 namebuf[namelen - 1] = 0;
470 fsck_object_dir(namebuf);
471 }
472 prepare_packed_git();
473 for (p = packed_git; p; p = p->next)
474 /* verify gives error messages itself */
475 verify_pack(p, 0);
476
477 for (p = packed_git; p; p = p->next) {
478 int num = num_packed_objects(p);
479 for (i = 0; i < num; i++) {
480 unsigned char sha1[20];
481 nth_packed_object_sha1(p, i, sha1);
482 if (fsck_sha1(sha1) < 0)
483 fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
484
485 }
486 }
487 }
488
489 heads = 0;
490 for (i = 1; i < argc; i++) {
491 const char *arg = argv[i];
492
493 if (*arg == '-')
494 continue;
495
496 if (!get_sha1(arg, head_sha1)) {
497 struct object *obj = lookup_object(head_sha1);
498
499 /* Error is printed by lookup_object(). */
500 if (!obj)
501 continue;
502
503 obj->used = 1;
504 mark_reachable(obj, REACHABLE);
505 heads++;
506 continue;
507 }
508 error("expected sha1, got %s", arg);
509 }
510
511 /*
512 * If we've not been given any explicit head information, do the
513 * default ones from .git/refs. We also consider the index file
514 * in this case (ie this implies --cache).
515 */
516 if (!heads) {
517 get_default_heads();
518 keep_cache_objects = 1;
519 }
520
521 if (keep_cache_objects) {
522 int i;
523 read_cache();
524 for (i = 0; i < active_nr; i++) {
525 struct blob *blob = lookup_blob(active_cache[i]->sha1);
526 struct object *obj;
527 if (!blob)
528 continue;
529 obj = &blob->object;
530 obj->used = 1;
531 mark_reachable(obj, REACHABLE);
532 }
533 }
534
535 check_connectivity();
536 return 0;
537}