gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / builtin / fsck.c
blob0929c7f245cbe85a4a68374850871a0ffbcdeec3
1 #include "builtin.h"
2 #include "cache.h"
3 #include "commit.h"
4 #include "tree.h"
5 #include "blob.h"
6 #include "tag.h"
7 #include "refs.h"
8 #include "pack.h"
9 #include "cache-tree.h"
10 #include "tree-walk.h"
11 #include "fsck.h"
12 #include "parse-options.h"
13 #include "dir.h"
15 #define REACHABLE 0x0001
16 #define SEEN 0x0002
18 static int show_root;
19 static int show_tags;
20 static int show_unreachable;
21 static int include_reflogs = 1;
22 static int check_full = 1;
23 static int check_strict;
24 static int keep_cache_objects;
25 static unsigned char head_sha1[20];
26 static const char *head_points_at;
27 static int errors_found;
28 static int write_lost_and_found;
29 static int verbose;
30 #define ERROR_OBJECT 01
31 #define ERROR_REACHABLE 02
33 #ifdef NO_D_INO_IN_DIRENT
34 #define SORT_DIRENT 0
35 #define DIRENT_SORT_HINT(de) 0
36 #else
37 #define SORT_DIRENT 1
38 #define DIRENT_SORT_HINT(de) ((de)->d_ino)
39 #endif
41 static void objreport(struct object *obj, const char *severity,
42 const char *err, va_list params)
44 fprintf(stderr, "%s in %s %s: ",
45 severity, typename(obj->type), sha1_to_hex(obj->sha1));
46 vfprintf(stderr, err, params);
47 fputs("\n", stderr);
50 __attribute__((format (printf, 2, 3)))
51 static int objerror(struct object *obj, const char *err, ...)
53 va_list params;
54 va_start(params, err);
55 errors_found |= ERROR_OBJECT;
56 objreport(obj, "error", err, params);
57 va_end(params);
58 return -1;
61 __attribute__((format (printf, 3, 4)))
62 static int fsck_error_func(struct object *obj, int type, const char *err, ...)
64 va_list params;
65 va_start(params, err);
66 objreport(obj, (type == FSCK_WARN) ? "warning" : "error", err, params);
67 va_end(params);
68 return (type == FSCK_WARN) ? 0 : 1;
71 static struct object_array pending;
73 static int mark_object(struct object *obj, int type, void *data)
75 struct object *parent = data;
77 if (!obj) {
78 printf("broken link from %7s %s\n",
79 typename(parent->type), sha1_to_hex(parent->sha1));
80 printf("broken link from %7s %s\n",
81 (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
82 errors_found |= ERROR_REACHABLE;
83 return 1;
86 if (type != OBJ_ANY && obj->type != type)
87 objerror(parent, "wrong object type in link");
89 if (obj->flags & REACHABLE)
90 return 0;
91 obj->flags |= REACHABLE;
92 if (!obj->parsed) {
93 if (parent && !has_sha1_file(obj->sha1)) {
94 printf("broken link from %7s %s\n",
95 typename(parent->type), sha1_to_hex(parent->sha1));
96 printf(" to %7s %s\n",
97 typename(obj->type), sha1_to_hex(obj->sha1));
98 errors_found |= ERROR_REACHABLE;
100 return 1;
103 add_object_array(obj, (void *) parent, &pending);
104 return 0;
107 static void mark_object_reachable(struct object *obj)
109 mark_object(obj, OBJ_ANY, NULL);
112 static int traverse_one_object(struct object *obj, struct object *parent)
114 int result;
115 struct tree *tree = NULL;
117 if (obj->type == OBJ_TREE) {
118 obj->parsed = 0;
119 tree = (struct tree *)obj;
120 if (parse_tree(tree) < 0)
121 return 1; /* error already displayed */
123 result = fsck_walk(obj, mark_object, obj);
124 if (tree) {
125 free(tree->buffer);
126 tree->buffer = NULL;
128 return result;
131 static int traverse_reachable(void)
133 int result = 0;
134 while (pending.nr) {
135 struct object_array_entry *entry;
136 struct object *obj, *parent;
138 entry = pending.objects + --pending.nr;
139 obj = entry->item;
140 parent = (struct object *) entry->name;
141 result |= traverse_one_object(obj, parent);
143 return !!result;
146 static int mark_used(struct object *obj, int type, void *data)
148 if (!obj)
149 return 1;
150 obj->used = 1;
151 return 0;
155 * Check a single reachable object
157 static void check_reachable_object(struct object *obj)
160 * We obviously want the object to be parsed,
161 * except if it was in a pack-file and we didn't
162 * do a full fsck
164 if (!obj->parsed) {
165 if (has_sha1_pack(obj->sha1))
166 return; /* it is in pack - forget about it */
167 printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
168 errors_found |= ERROR_REACHABLE;
169 return;
174 * Check a single unreachable object
176 static void check_unreachable_object(struct object *obj)
179 * Missing unreachable object? Ignore it. It's not like
180 * we miss it (since it can't be reached), nor do we want
181 * to complain about it being unreachable (since it does
182 * not exist).
184 if (!obj->parsed)
185 return;
188 * Unreachable object that exists? Show it if asked to,
189 * since this is something that is prunable.
191 if (show_unreachable) {
192 printf("unreachable %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
193 return;
197 * "!used" means that nothing at all points to it, including
198 * other unreachable objects. In other words, it's the "tip"
199 * of some set of unreachable objects, usually a commit that
200 * got dropped.
202 * Such starting points are more interesting than some random
203 * set of unreachable objects, so we show them even if the user
204 * hasn't asked for _all_ unreachable objects. If you have
205 * deleted a branch by mistake, this is a prime candidate to
206 * start looking at, for example.
208 if (!obj->used) {
209 printf("dangling %s %s\n", typename(obj->type),
210 sha1_to_hex(obj->sha1));
211 if (write_lost_and_found) {
212 char *filename = git_path("lost-found/%s/%s",
213 obj->type == OBJ_COMMIT ? "commit" : "other",
214 sha1_to_hex(obj->sha1));
215 FILE *f;
217 if (safe_create_leading_directories(filename)) {
218 error("Could not create lost-found");
219 return;
221 if (!(f = fopen(filename, "w")))
222 die_errno("Could not open '%s'", filename);
223 if (obj->type == OBJ_BLOB) {
224 enum object_type type;
225 unsigned long size;
226 char *buf = read_sha1_file(obj->sha1,
227 &type, &size);
228 if (buf) {
229 if (fwrite(buf, size, 1, f) != 1)
230 die_errno("Could not write '%s'",
231 filename);
232 free(buf);
234 } else
235 fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
236 if (fclose(f))
237 die_errno("Could not finish '%s'",
238 filename);
240 return;
244 * Otherwise? It's there, it's unreachable, and some other unreachable
245 * object points to it. Ignore it - it's not interesting, and we showed
246 * all the interesting cases above.
250 static void check_object(struct object *obj)
252 if (verbose)
253 fprintf(stderr, "Checking %s\n", sha1_to_hex(obj->sha1));
255 if (obj->flags & REACHABLE)
256 check_reachable_object(obj);
257 else
258 check_unreachable_object(obj);
261 static void check_connectivity(void)
263 int i, max;
265 /* Traverse the pending reachable objects */
266 traverse_reachable();
268 /* Look up all the requirements, warn about missing objects.. */
269 max = get_max_object_index();
270 if (verbose)
271 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
273 for (i = 0; i < max; i++) {
274 struct object *obj = get_indexed_object(i);
276 if (obj)
277 check_object(obj);
281 static int fsck_sha1(const unsigned char *sha1)
283 struct object *obj = parse_object(sha1);
284 if (!obj) {
285 errors_found |= ERROR_OBJECT;
286 return error("%s: object corrupt or missing",
287 sha1_to_hex(sha1));
289 if (obj->flags & SEEN)
290 return 0;
291 obj->flags |= SEEN;
293 if (verbose)
294 fprintf(stderr, "Checking %s %s\n",
295 typename(obj->type), sha1_to_hex(obj->sha1));
297 if (fsck_walk(obj, mark_used, NULL))
298 objerror(obj, "broken links");
299 if (fsck_object(obj, check_strict, fsck_error_func))
300 return -1;
302 if (obj->type == OBJ_TREE) {
303 struct tree *item = (struct tree *) obj;
305 free(item->buffer);
306 item->buffer = NULL;
309 if (obj->type == OBJ_COMMIT) {
310 struct commit *commit = (struct commit *) obj;
312 free(commit->buffer);
313 commit->buffer = NULL;
315 if (!commit->parents && show_root)
316 printf("root %s\n", sha1_to_hex(commit->object.sha1));
319 if (obj->type == OBJ_TAG) {
320 struct tag *tag = (struct tag *) obj;
322 if (show_tags && tag->tagged) {
323 printf("tagged %s %s", typename(tag->tagged->type), sha1_to_hex(tag->tagged->sha1));
324 printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
328 return 0;
332 * This is the sorting chunk size: make it reasonably
333 * big so that we can sort well..
335 #define MAX_SHA1_ENTRIES (1024)
337 struct sha1_entry {
338 unsigned long ino;
339 unsigned char sha1[20];
342 static struct {
343 unsigned long nr;
344 struct sha1_entry *entry[MAX_SHA1_ENTRIES];
345 } sha1_list;
347 static int ino_compare(const void *_a, const void *_b)
349 const struct sha1_entry *a = _a, *b = _b;
350 unsigned long ino1 = a->ino, ino2 = b->ino;
351 return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
354 static void fsck_sha1_list(void)
356 int i, nr = sha1_list.nr;
358 if (SORT_DIRENT)
359 qsort(sha1_list.entry, nr,
360 sizeof(struct sha1_entry *), ino_compare);
361 for (i = 0; i < nr; i++) {
362 struct sha1_entry *entry = sha1_list.entry[i];
363 unsigned char *sha1 = entry->sha1;
365 sha1_list.entry[i] = NULL;
366 fsck_sha1(sha1);
367 free(entry);
369 sha1_list.nr = 0;
372 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
374 struct sha1_entry *entry = xmalloc(sizeof(*entry));
375 int nr;
377 entry->ino = ino;
378 hashcpy(entry->sha1, sha1);
379 nr = sha1_list.nr;
380 if (nr == MAX_SHA1_ENTRIES) {
381 fsck_sha1_list();
382 nr = 0;
384 sha1_list.entry[nr] = entry;
385 sha1_list.nr = ++nr;
388 static void fsck_dir(int i, char *path)
390 DIR *dir = opendir(path);
391 struct dirent *de;
393 if (!dir)
394 return;
396 if (verbose)
397 fprintf(stderr, "Checking directory %s\n", path);
399 while ((de = readdir(dir)) != NULL) {
400 char name[100];
401 unsigned char sha1[20];
403 if (is_dot_or_dotdot(de->d_name))
404 continue;
405 if (strlen(de->d_name) == 38) {
406 sprintf(name, "%02x", i);
407 memcpy(name+2, de->d_name, 39);
408 if (get_sha1_hex(name, sha1) < 0)
409 break;
410 add_sha1_list(sha1, DIRENT_SORT_HINT(de));
411 continue;
413 if (!prefixcmp(de->d_name, "tmp_obj_"))
414 continue;
415 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
417 closedir(dir);
420 static int default_refs;
422 static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
423 const char *email, unsigned long timestamp, int tz,
424 const char *message, void *cb_data)
426 struct object *obj;
428 if (verbose)
429 fprintf(stderr, "Checking reflog %s->%s\n",
430 sha1_to_hex(osha1), sha1_to_hex(nsha1));
432 if (!is_null_sha1(osha1)) {
433 obj = lookup_object(osha1);
434 if (obj) {
435 obj->used = 1;
436 mark_object_reachable(obj);
439 obj = lookup_object(nsha1);
440 if (obj) {
441 obj->used = 1;
442 mark_object_reachable(obj);
444 return 0;
447 static int fsck_handle_reflog(const char *logname, const unsigned char *sha1, int flag, void *cb_data)
449 for_each_reflog_ent(logname, fsck_handle_reflog_ent, NULL);
450 return 0;
453 static int is_branch(const char *refname)
455 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
458 static int fsck_handle_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
460 struct object *obj;
462 obj = parse_object(sha1);
463 if (!obj) {
464 error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
465 /* We'll continue with the rest despite the error.. */
466 return 0;
468 if (obj->type != OBJ_COMMIT && is_branch(refname))
469 error("%s: not a commit", refname);
470 default_refs++;
471 obj->used = 1;
472 mark_object_reachable(obj);
474 return 0;
477 static void get_default_heads(void)
479 if (head_points_at && !is_null_sha1(head_sha1))
480 fsck_handle_ref("HEAD", head_sha1, 0, NULL);
481 for_each_ref(fsck_handle_ref, NULL);
482 if (include_reflogs)
483 for_each_reflog(fsck_handle_reflog, NULL);
486 * Not having any default heads isn't really fatal, but
487 * it does mean that "--unreachable" no longer makes any
488 * sense (since in this case everything will obviously
489 * be unreachable by definition.
491 * Showing dangling objects is valid, though (as those
492 * dangling objects are likely lost heads).
494 * So we just print a warning about it, and clear the
495 * "show_unreachable" flag.
497 if (!default_refs) {
498 fprintf(stderr, "notice: No default references\n");
499 show_unreachable = 0;
503 static void fsck_object_dir(const char *path)
505 int i;
507 if (verbose)
508 fprintf(stderr, "Checking object directory\n");
510 for (i = 0; i < 256; i++) {
511 static char dir[4096];
512 sprintf(dir, "%s/%02x", path, i);
513 fsck_dir(i, dir);
515 fsck_sha1_list();
518 static int fsck_head_link(void)
520 int flag;
521 int null_is_error = 0;
523 if (verbose)
524 fprintf(stderr, "Checking HEAD link\n");
526 head_points_at = resolve_ref("HEAD", head_sha1, 0, &flag);
527 if (!head_points_at)
528 return error("Invalid HEAD");
529 if (!strcmp(head_points_at, "HEAD"))
530 /* detached HEAD */
531 null_is_error = 1;
532 else if (prefixcmp(head_points_at, "refs/heads/"))
533 return error("HEAD points to something strange (%s)",
534 head_points_at);
535 if (is_null_sha1(head_sha1)) {
536 if (null_is_error)
537 return error("HEAD: detached HEAD points at nothing");
538 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
539 head_points_at + 11);
541 return 0;
544 static int fsck_cache_tree(struct cache_tree *it)
546 int i;
547 int err = 0;
549 if (verbose)
550 fprintf(stderr, "Checking cache tree\n");
552 if (0 <= it->entry_count) {
553 struct object *obj = parse_object(it->sha1);
554 if (!obj) {
555 error("%s: invalid sha1 pointer in cache-tree",
556 sha1_to_hex(it->sha1));
557 return 1;
559 mark_object_reachable(obj);
560 obj->used = 1;
561 if (obj->type != OBJ_TREE)
562 err |= objerror(obj, "non-tree in cache-tree");
564 for (i = 0; i < it->subtree_nr; i++)
565 err |= fsck_cache_tree(it->down[i]->cache_tree);
566 return err;
569 static char const * const fsck_usage[] = {
570 "git fsck [options] [<object>...]",
571 NULL
574 static struct option fsck_opts[] = {
575 OPT__VERBOSE(&verbose),
576 OPT_BOOLEAN(0, "unreachable", &show_unreachable, "show unreachable objects"),
577 OPT_BOOLEAN(0, "tags", &show_tags, "report tags"),
578 OPT_BOOLEAN(0, "root", &show_root, "report root nodes"),
579 OPT_BOOLEAN(0, "cache", &keep_cache_objects, "make index objects head nodes"),
580 OPT_BOOLEAN(0, "reflogs", &include_reflogs, "make reflogs head nodes (default)"),
581 OPT_BOOLEAN(0, "full", &check_full, "also consider packs and alternate objects"),
582 OPT_BOOLEAN(0, "strict", &check_strict, "enable more strict checking"),
583 OPT_BOOLEAN(0, "lost-found", &write_lost_and_found,
584 "write dangling objects in .git/lost-found"),
585 OPT_END(),
588 int cmd_fsck(int argc, const char **argv, const char *prefix)
590 int i, heads;
591 struct alternate_object_database *alt;
593 errors_found = 0;
594 read_replace_refs = 0;
596 argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
597 if (write_lost_and_found) {
598 check_full = 1;
599 include_reflogs = 0;
602 fsck_head_link();
603 fsck_object_dir(get_object_directory());
605 prepare_alt_odb();
606 for (alt = alt_odb_list; alt; alt = alt->next) {
607 char namebuf[PATH_MAX];
608 int namelen = alt->name - alt->base;
609 memcpy(namebuf, alt->base, namelen);
610 namebuf[namelen - 1] = 0;
611 fsck_object_dir(namebuf);
614 if (check_full) {
615 struct packed_git *p;
617 prepare_packed_git();
618 for (p = packed_git; p; p = p->next)
619 /* verify gives error messages itself */
620 verify_pack(p);
622 for (p = packed_git; p; p = p->next) {
623 uint32_t j, num;
624 if (open_pack_index(p))
625 continue;
626 num = p->num_objects;
627 for (j = 0; j < num; j++)
628 fsck_sha1(nth_packed_object_sha1(p, j));
632 heads = 0;
633 for (i = 0; i < argc; i++) {
634 const char *arg = argv[i];
635 unsigned char sha1[20];
636 if (!get_sha1(arg, sha1)) {
637 struct object *obj = lookup_object(sha1);
639 /* Error is printed by lookup_object(). */
640 if (!obj)
641 continue;
643 obj->used = 1;
644 mark_object_reachable(obj);
645 heads++;
646 continue;
648 error("invalid parameter: expected sha1, got '%s'", arg);
652 * If we've not been given any explicit head information, do the
653 * default ones from .git/refs. We also consider the index file
654 * in this case (ie this implies --cache).
656 if (!heads) {
657 get_default_heads();
658 keep_cache_objects = 1;
661 if (keep_cache_objects) {
662 read_cache();
663 for (i = 0; i < active_nr; i++) {
664 unsigned int mode;
665 struct blob *blob;
666 struct object *obj;
668 mode = active_cache[i]->ce_mode;
669 if (S_ISGITLINK(mode))
670 continue;
671 blob = lookup_blob(active_cache[i]->sha1);
672 if (!blob)
673 continue;
674 obj = &blob->object;
675 obj->used = 1;
676 mark_object_reachable(obj);
678 if (active_cache_tree)
679 fsck_cache_tree(active_cache_tree);
682 check_connectivity();
683 return errors_found;