#include "builtin.h" #include "cache.h" #include "commit.h" #include "tree.h" #include "blob.h" #include "tag.h" #include "refs.h" #include "pack.h" #include "cache-tree.h" #include "tree-walk.h" #include "fsck.h" #include "parse-options.h" #include "dir.h" #define REACHABLE 0x0001 #define SEEN 0x0002 static int show_root; static int show_tags; static int show_unreachable; static int include_reflogs = 1; static int check_full = 1; static int check_strict; static int keep_cache_objects; static unsigned char head_sha1[20]; static const char *head_points_at; static int errors_found; static int write_lost_and_found; static int verbose; #define ERROR_OBJECT 01 #define ERROR_REACHABLE 02 #ifdef NO_D_INO_IN_DIRENT #define SORT_DIRENT 0 #define DIRENT_SORT_HINT(de) 0 #else #define SORT_DIRENT 1 #define DIRENT_SORT_HINT(de) ((de)->d_ino) #endif static void objreport(struct object *obj, const char *severity, const char *err, va_list params) { fprintf(stderr, "%s in %s %s: ", severity, typename(obj->type), sha1_to_hex(obj->sha1)); vfprintf(stderr, err, params); fputs("\n", stderr); } __attribute__((format (printf, 2, 3))) static int objerror(struct object *obj, const char *err, ...) { va_list params; va_start(params, err); errors_found |= ERROR_OBJECT; objreport(obj, "error", err, params); va_end(params); return -1; } __attribute__((format (printf, 3, 4))) static int fsck_error_func(struct object *obj, int type, const char *err, ...) { va_list params; va_start(params, err); objreport(obj, (type == FSCK_WARN) ? "warning" : "error", err, params); va_end(params); return (type == FSCK_WARN) ? 0 : 1; } static struct object_array pending; static int mark_object(struct object *obj, int type, void *data) { struct object *parent = data; if (!obj) { printf("broken link from %7s %s\n", typename(parent->type), sha1_to_hex(parent->sha1)); printf("broken link from %7s %s\n", (type == OBJ_ANY ? "unknown" : typename(type)), "unknown"); errors_found |= ERROR_REACHABLE; return 1; } if (type != OBJ_ANY && obj->type != type) objerror(parent, "wrong object type in link"); if (obj->flags & REACHABLE) return 0; obj->flags |= REACHABLE; if (!obj->parsed) { if (parent && !has_sha1_file(obj->sha1)) { printf("broken link from %7s %s\n", typename(parent->type), sha1_to_hex(parent->sha1)); printf(" to %7s %s\n", typename(obj->type), sha1_to_hex(obj->sha1)); errors_found |= ERROR_REACHABLE; } return 1; } add_object_array(obj, (void *) parent, &pending); return 0; } static void mark_object_reachable(struct object *obj) { mark_object(obj, OBJ_ANY, NULL); } static int traverse_one_object(struct object *obj, struct object *parent) { int result; struct tree *tree = NULL; if (obj->type == OBJ_TREE) { obj->parsed = 0; tree = (struct tree *)obj; if (parse_tree(tree) < 0) return 1; /* error already displayed */ } result = fsck_walk(obj, mark_object, obj); if (tree) { free(tree->buffer); tree->buffer = NULL; } return result; } static int traverse_reachable(void) { int result = 0; while (pending.nr) { struct object_array_entry *entry; struct object *obj, *parent; entry = pending.objects + --pending.nr; obj = entry->item; parent = (struct object *) entry->name; result |= traverse_one_object(obj, parent); } return !!result; } static int mark_used(struct object *obj, int type, void *data) { if (!obj) return 1; obj->used = 1; return 0; } /* * Check a single reachable object */ static void check_reachable_object(struct object *obj) { /* * We obviously want the object to be parsed, * except if it was in a pack-file and we didn't * do a full fsck */ if (!obj->parsed) { if (has_sha1_pack(obj->sha1)) return; /* it is in pack - forget about it */ printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1)); errors_found |= ERROR_REACHABLE; return; } } /* * Check a single unreachable object */ static void check_unreachable_object(struct object *obj) { /* * Missing unreachable object? Ignore it. It's not like * we miss it (since it can't be reached), nor do we want * to complain about it being unreachable (since it does * not exist). */ if (!obj->parsed) return; /* * Unreachable object that exists? Show it if asked to, * since this is something that is prunable. */ if (show_unreachable) { printf("unreachable %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1)); return; } /* * "!used" means that nothing at all points to it, including * other unreachable objects. In other words, it's the "tip" * of some set of unreachable objects, usually a commit that * got dropped. * * Such starting points are more interesting than some random * set of unreachable objects, so we show them even if the user * hasn't asked for _all_ unreachable objects. If you have * deleted a branch by mistake, this is a prime candidate to * start looking at, for example. */ if (!obj->used) { printf("dangling %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1)); if (write_lost_and_found) { char *filename = git_path("lost-found/%s/%s", obj->type == OBJ_COMMIT ? "commit" : "other", sha1_to_hex(obj->sha1)); FILE *f; if (safe_create_leading_directories(filename)) { error("Could not create lost-found"); return; } if (!(f = fopen(filename, "w"))) die_errno("Could not open '%s'", filename); if (obj->type == OBJ_BLOB) { enum object_type type; unsigned long size; char *buf = read_sha1_file(obj->sha1, &type, &size); if (buf) { if (fwrite(buf, size, 1, f) != 1) die_errno("Could not write '%s'", filename); free(buf); } } else fprintf(f, "%s\n", sha1_to_hex(obj->sha1)); if (fclose(f)) die_errno("Could not finish '%s'", filename); } return; } /* * Otherwise? It's there, it's unreachable, and some other unreachable * object points to it. Ignore it - it's not interesting, and we showed * all the interesting cases above. */ } static void check_object(struct object *obj) { if (verbose) fprintf(stderr, "Checking %s\n", sha1_to_hex(obj->sha1)); if (obj->flags & REACHABLE) check_reachable_object(obj); else check_unreachable_object(obj); } static void check_connectivity(void) { int i, max; /* Traverse the pending reachable objects */ traverse_reachable(); /* Look up all the requirements, warn about missing objects.. */ max = get_max_object_index(); if (verbose) fprintf(stderr, "Checking connectivity (%d objects)\n", max); for (i = 0; i < max; i++) { struct object *obj = get_indexed_object(i); if (obj) check_object(obj); } } static int fsck_sha1(const unsigned char *sha1) { struct object *obj = parse_object(sha1); if (!obj) { errors_found |= ERROR_OBJECT; return error("%s: object corrupt or missing", sha1_to_hex(sha1)); } if (obj->flags & SEEN) return 0; obj->flags |= SEEN; if (verbose) fprintf(stderr, "Checking %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1)); if (fsck_walk(obj, mark_used, NULL)) objerror(obj, "broken links"); if (fsck_object(obj, check_strict, fsck_error_func)) return -1; if (obj->type == OBJ_TREE) { struct tree *item = (struct tree *) obj; free(item->buffer); item->buffer = NULL; } if (obj->type == OBJ_COMMIT) { struct commit *commit = (struct commit *) obj; free(commit->buffer); commit->buffer = NULL; if (!commit->parents && show_root) printf("root %s\n", sha1_to_hex(commit->object.sha1)); } if (obj->type == OBJ_TAG) { struct tag *tag = (struct tag *) obj; if (show_tags && tag->tagged) { printf("tagged %s %s", typename(tag->tagged->type), sha1_to_hex(tag->tagged->sha1)); printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1)); } } return 0; } /* * This is the sorting chunk size: make it reasonably * big so that we can sort well.. */ #define MAX_SHA1_ENTRIES (1024) struct sha1_entry { unsigned long ino; unsigned char sha1[20]; }; static struct { unsigned long nr; struct sha1_entry *entry[MAX_SHA1_ENTRIES]; } sha1_list; static int ino_compare(const void *_a, const void *_b) { const struct sha1_entry *a = _a, *b = _b; unsigned long ino1 = a->ino, ino2 = b->ino; return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0; } static void fsck_sha1_list(void) { int i, nr = sha1_list.nr; if (SORT_DIRENT) qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare); for (i = 0; i < nr; i++) { struct sha1_entry *entry = sha1_list.entry[i]; unsigned char *sha1 = entry->sha1; sha1_list.entry[i] = NULL; fsck_sha1(sha1); free(entry); } sha1_list.nr = 0; } static void add_sha1_list(unsigned char *sha1, unsigned long ino) { struct sha1_entry *entry = xmalloc(sizeof(*entry)); int nr; entry->ino = ino; hashcpy(entry->sha1, sha1); nr = sha1_list.nr; if (nr == MAX_SHA1_ENTRIES) { fsck_sha1_list(); nr = 0; } sha1_list.entry[nr] = entry; sha1_list.nr = ++nr; } static void fsck_dir(int i, char *path) { DIR *dir = opendir(path); struct dirent *de; if (!dir) return; if (verbose) fprintf(stderr, "Checking directory %s\n", path); while ((de = readdir(dir)) != NULL) { char name[100]; unsigned char sha1[20]; if (is_dot_or_dotdot(de->d_name)) continue; if (strlen(de->d_name) == 38) { sprintf(name, "%02x", i); memcpy(name+2, de->d_name, 39); if (get_sha1_hex(name, sha1) < 0) break; add_sha1_list(sha1, DIRENT_SORT_HINT(de)); continue; } if (!prefixcmp(de->d_name, "tmp_obj_")) continue; fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name); } closedir(dir); } static int default_refs; static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1, const char *email, unsigned long timestamp, int tz, const char *message, void *cb_data) { struct object *obj; if (verbose) fprintf(stderr, "Checking reflog %s->%s\n", sha1_to_hex(osha1), sha1_to_hex(nsha1)); if (!is_null_sha1(osha1)) { obj = lookup_object(osha1); if (obj) { obj->used = 1; mark_object_reachable(obj); } } obj = lookup_object(nsha1); if (obj) { obj->used = 1; mark_object_reachable(obj); } return 0; } static int fsck_handle_reflog(const char *logname, const unsigned char *sha1, int flag, void *cb_data) { for_each_reflog_ent(logname, fsck_handle_reflog_ent, NULL); return 0; } static int is_branch(const char *refname) { return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); } static int fsck_handle_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data) { struct object *obj; obj = parse_object(sha1); if (!obj) { error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1)); /* We'll continue with the rest despite the error.. */ return 0; } if (obj->type != OBJ_COMMIT && is_branch(refname)) error("%s: not a commit", refname); default_refs++; obj->used = 1; mark_object_reachable(obj); return 0; } static void get_default_heads(void) { if (head_points_at && !is_null_sha1(head_sha1)) fsck_handle_ref("HEAD", head_sha1, 0, NULL); for_each_ref(fsck_handle_ref, NULL); if (include_reflogs) for_each_reflog(fsck_handle_reflog, NULL); /* * Not having any default heads isn't really fatal, but * it does mean that "--unreachable" no longer makes any * sense (since in this case everything will obviously * be unreachable by definition. * * Showing dangling objects is valid, though (as those * dangling objects are likely lost heads). * * So we just print a warning about it, and clear the * "show_unreachable" flag. */ if (!default_refs) { fprintf(stderr, "notice: No default references\n"); show_unreachable = 0; } } static void fsck_object_dir(const char *path) { int i; if (verbose) fprintf(stderr, "Checking object directory\n"); for (i = 0; i < 256; i++) { static char dir[4096]; sprintf(dir, "%s/%02x", path, i); fsck_dir(i, dir); } fsck_sha1_list(); } static int fsck_head_link(void) { int flag; int null_is_error = 0; if (verbose) fprintf(stderr, "Checking HEAD link\n"); head_points_at = resolve_ref("HEAD", head_sha1, 0, &flag); if (!head_points_at) return error("Invalid HEAD"); if (!strcmp(head_points_at, "HEAD")) /* detached HEAD */ null_is_error = 1; else if (prefixcmp(head_points_at, "refs/heads/")) return error("HEAD points to something strange (%s)", head_points_at); if (is_null_sha1(head_sha1)) { if (null_is_error) return error("HEAD: detached HEAD points at nothing"); fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n", head_points_at + 11); } return 0; } static int fsck_cache_tree(struct cache_tree *it) { int i; int err = 0; if (verbose) fprintf(stderr, "Checking cache tree\n"); if (0 <= it->entry_count) { struct object *obj = parse_object(it->sha1); if (!obj) { error("%s: invalid sha1 pointer in cache-tree", sha1_to_hex(it->sha1)); return 1; } mark_object_reachable(obj); obj->used = 1; if (obj->type != OBJ_TREE) err |= objerror(obj, "non-tree in cache-tree"); } for (i = 0; i < it->subtree_nr; i++) err |= fsck_cache_tree(it->down[i]->cache_tree); return err; } static char const * const fsck_usage[] = { "git fsck [options] [<object>...]", NULL }; static struct option fsck_opts[] = { OPT__VERBOSE(&verbose), OPT_BOOLEAN(0, "unreachable", &show_unreachable, "show unreachable objects"), OPT_BOOLEAN(0, "tags", &show_tags, "report tags"), OPT_BOOLEAN(0, "root", &show_root, "report root nodes"), OPT_BOOLEAN(0, "cache", &keep_cache_objects, "make index objects head nodes"), OPT_BOOLEAN(0, "reflogs", &include_reflogs, "make reflogs head nodes (default)"), OPT_BOOLEAN(0, "full", &check_full, "also consider packs and alternate objects"), OPT_BOOLEAN(0, "strict", &check_strict, "enable more strict checking"), OPT_BOOLEAN(0, "lost-found", &write_lost_and_found, "write dangling objects in .git/lost-found"), OPT_END(), }; int cmd_fsck(int argc, const char **argv, const char *prefix) { int i, heads; struct alternate_object_database *alt; errors_found = 0; read_replace_refs = 0; argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0); if (write_lost_and_found) { check_full = 1; include_reflogs = 0; } fsck_head_link(); fsck_object_dir(get_object_directory()); prepare_alt_odb(); for (alt = alt_odb_list; alt; alt = alt->next) { char namebuf[PATH_MAX]; int namelen = alt->name - alt->base; memcpy(namebuf, alt->base, namelen); namebuf[namelen - 1] = 0; fsck_object_dir(namebuf); } if (check_full) { struct packed_git *p; prepare_packed_git(); for (p = packed_git; p; p = p->next) /* verify gives error messages itself */ verify_pack(p); for (p = packed_git; p; p = p->next) { uint32_t j, num; if (open_pack_index(p)) continue; num = p->num_objects; for (j = 0; j < num; j++) fsck_sha1(nth_packed_object_sha1(p, j)); } } heads = 0; for (i = 0; i < argc; i++) { const char *arg = argv[i]; unsigned char sha1[20]; if (!get_sha1(arg, sha1)) { struct object *obj = lookup_object(sha1); /* Error is printed by lookup_object(). */ if (!obj) continue; obj->used = 1; mark_object_reachable(obj); heads++; continue; } error("invalid parameter: expected sha1, got '%s'", arg); } /* * If we've not been given any explicit head information, do the * default ones from .git/refs. We also consider the index file * in this case (ie this implies --cache). */ if (!heads) { get_default_heads(); keep_cache_objects = 1; } if (keep_cache_objects) { read_cache(); for (i = 0; i < active_nr; i++) { unsigned int mode; struct blob *blob; struct object *obj; mode = active_cache[i]->ce_mode; if (S_ISGITLINK(mode)) continue; blob = lookup_blob(active_cache[i]->sha1); if (!blob) continue; obj = &blob->object; obj->used = 1; mark_object_reachable(obj); } if (active_cache_tree) fsck_cache_tree(active_cache_tree); } check_connectivity(); return errors_found; }