#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" #include "progress.h" #include "streaming.h" #define REACHABLE 0x0001 #define SEEN 0x0002 #define HAS_OBJ 0x0004 static int show_root; static int show_tags; static int show_unreachable; static int include_reflogs = 1; static int check_full = 1; static int connectivity_only; static int check_strict; static int keep_cache_objects; static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT; static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT; static struct object_id head_oid; static const char *head_points_at; static int errors_found; static int write_lost_and_found; static int verbose; static int show_progress = -1; static int show_dangling = 1; #define ERROR_OBJECT 01 #define ERROR_REACHABLE 02 #define ERROR_PACK 04 #define ERROR_REFS 010 static int fsck_config(const char *var, const char *value, void *cb) { if (strcmp(var, "fsck.skiplist") == 0) { const char *path; struct strbuf sb = STRBUF_INIT; if (git_config_pathname(&path, var, value)) return 1; strbuf_addf(&sb, "skiplist=%s", path); free((char *)path); fsck_set_msg_types(&fsck_obj_options, sb.buf); strbuf_release(&sb); return 0; } if (skip_prefix(var, "fsck.", &var)) { fsck_set_msg_type(&fsck_obj_options, var, value); return 0; } return git_default_config(var, value, cb); } static void objreport(struct object *obj, const char *msg_type, const char *err) { fprintf(stderr, "%s in %s %s: %s\n", msg_type, typename(obj->type), oid_to_hex(&obj->oid), err); } static int objerror(struct object *obj, const char *err) { errors_found |= ERROR_OBJECT; objreport(obj, "error", err); return -1; } static int fsck_error_func(struct object *obj, int type, const char *message) { objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message); return (type == FSCK_WARN) ? 0 : 1; } static struct object_array pending; static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options) { struct object *parent = data; /* * The only case data is NULL or type is OBJ_ANY is when * mark_object_reachable() calls us. All the callers of * that function has non-NULL obj hence ... */ if (!obj) { /* ... these references to parent->fld are safe here */ printf("broken link from %7s %s\n", typename(parent->type), oid_to_hex(&parent->oid)); 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) /* ... and the reference to parent is safe here */ objerror(parent, "wrong object type in link"); if (obj->flags & REACHABLE) return 0; obj->flags |= REACHABLE; if (!(obj->flags & HAS_OBJ)) { if (parent && !has_object_file(&obj->oid)) { printf("broken link from %7s %s\n", typename(parent->type), oid_to_hex(&parent->oid)); printf(" to %7s %s\n", typename(obj->type), oid_to_hex(&obj->oid)); errors_found |= ERROR_REACHABLE; } return 1; } add_object_array(obj, NULL, &pending); return 0; } static void mark_object_reachable(struct object *obj) { mark_object(obj, OBJ_ANY, NULL, NULL); } static int traverse_one_object(struct object *obj) { int result; struct tree *tree = NULL; if (obj->type == OBJ_TREE) { tree = (struct tree *)obj; if (parse_tree(tree) < 0) return 1; /* error already displayed */ } result = fsck_walk(obj, obj, &fsck_walk_options); if (tree) free_tree_buffer(tree); return result; } static int traverse_reachable(void) { struct progress *progress = NULL; unsigned int nr = 0; int result = 0; if (show_progress) progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2); while (pending.nr) { struct object_array_entry *entry; struct object *obj; entry = pending.objects + --pending.nr; obj = entry->item; result |= traverse_one_object(obj); display_progress(progress, ++nr); } stop_progress(&progress); return !!result; } static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options) { 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->flags & HAS_OBJ)) { if (has_sha1_pack(obj->oid.hash)) return; /* it is in pack - forget about it */ if (connectivity_only && has_object_file(&obj->oid)) return; printf("missing %s %s\n", typename(obj->type), oid_to_hex(&obj->oid)); 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), oid_to_hex(&obj->oid)); 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) { if (show_dangling) printf("dangling %s %s\n", typename(obj->type), oid_to_hex(&obj->oid)); if (write_lost_and_found) { char *filename = git_pathdup("lost-found/%s/%s", obj->type == OBJ_COMMIT ? "commit" : "other", oid_to_hex(&obj->oid)); FILE *f; if (safe_create_leading_directories_const(filename)) { error("Could not create lost-found"); free(filename); return; } if (!(f = fopen(filename, "w"))) die_errno("Could not open '%s'", filename); if (obj->type == OBJ_BLOB) { if (stream_blob_to_fd(fileno(f), obj->oid.hash, NULL, 1)) die_errno("Could not write '%s'", filename); } else fprintf(f, "%s\n", oid_to_hex(&obj->oid)); if (fclose(f)) die_errno("Could not finish '%s'", filename); free(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", oid_to_hex(&obj->oid)); 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_obj(struct object *obj) { if (obj->flags & SEEN) return 0; obj->flags |= SEEN; if (verbose) fprintf(stderr, "Checking %s %s\n", typename(obj->type), oid_to_hex(&obj->oid)); if (fsck_walk(obj, NULL, &fsck_obj_options)) objerror(obj, "broken links"); if (fsck_object(obj, NULL, 0, &fsck_obj_options)) return -1; if (obj->type == OBJ_TREE) { struct tree *item = (struct tree *) obj; free_tree_buffer(item); } if (obj->type == OBJ_COMMIT) { struct commit *commit = (struct commit *) obj; free_commit_buffer(commit); if (!commit->parents && show_root) printf("root %s\n", oid_to_hex(&commit->object.oid)); } if (obj->type == OBJ_TAG) { struct tag *tag = (struct tag *) obj; if (show_tags && tag->tagged) { printf("tagged %s %s", typename(tag->tagged->type), oid_to_hex(&tag->tagged->oid)); printf(" (%s) in %s\n", tag->tag, oid_to_hex(&tag->object.oid)); } } return 0; } 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)); } obj->flags |= HAS_OBJ; return fsck_obj(obj); } static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten) { struct object *obj; obj = parse_object_buffer(sha1, type, size, buffer, eaten); if (!obj) { errors_found |= ERROR_OBJECT; return error("%s: object corrupt or missing", sha1_to_hex(sha1)); } obj->flags = HAS_OBJ; return fsck_obj(obj); } static int default_refs; static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1) { struct object *obj; if (!is_null_sha1(sha1)) { obj = lookup_object(sha1); if (obj) { obj->used = 1; mark_object_reachable(obj); } else { error("%s: invalid reflog entry %s", refname, sha1_to_hex(sha1)); errors_found |= ERROR_REACHABLE; } } } 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) { const char *refname = cb_data; if (verbose) fprintf(stderr, "Checking reflog %s->%s\n", sha1_to_hex(osha1), sha1_to_hex(nsha1)); fsck_handle_reflog_sha1(refname, osha1); fsck_handle_reflog_sha1(refname, nsha1); return 0; } static int fsck_handle_reflog(const char *logname, const struct object_id *oid, int flag, void *cb_data) { for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname); return 0; } static int fsck_handle_ref(const char *refname, const struct object_id *oid, int flag, void *cb_data) { struct object *obj; obj = parse_object(oid->hash); if (!obj) { error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid)); errors_found |= ERROR_REACHABLE; /* 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); errors_found |= ERROR_REFS; } default_refs++; obj->used = 1; mark_object_reachable(obj); return 0; } static void get_default_heads(void) { if (head_points_at && !is_null_oid(&head_oid)) fsck_handle_ref("HEAD", &head_oid, 0, NULL); for_each_rawref(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 int fsck_loose(const unsigned char *sha1, const char *path, void *data) { if (fsck_sha1(sha1)) errors_found |= ERROR_OBJECT; return 0; } static int fsck_cruft(const char *basename, const char *path, void *data) { if (!starts_with(basename, "tmp_obj_")) fprintf(stderr, "bad sha1 file: %s\n", path); return 0; } static int fsck_subdir(int nr, const char *path, void *progress) { display_progress(progress, nr + 1); return 0; } static void fsck_object_dir(const char *path) { struct progress *progress = NULL; if (verbose) fprintf(stderr, "Checking object directory\n"); if (show_progress) progress = start_progress(_("Checking object directories"), 256); for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir, progress); display_progress(progress, 256); stop_progress(&progress); } 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_unsafe("HEAD", 0, head_oid.hash, &flag); if (!head_points_at) { errors_found |= ERROR_REFS; return error("Invalid HEAD"); } if (!strcmp(head_points_at, "HEAD")) /* detached HEAD */ null_is_error = 1; else if (!starts_with(head_points_at, "refs/heads/")) { errors_found |= ERROR_REFS; return error("HEAD points to something strange (%s)", head_points_at); } if (is_null_oid(&head_oid)) { if (null_is_error) { errors_found |= ERROR_REFS; 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)); errors_found |= ERROR_REFS; return 1; } obj->used = 1; mark_object_reachable(obj); 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[] = { N_("git fsck [<options>] [<object>...]"), NULL }; static struct option fsck_opts[] = { OPT__VERBOSE(&verbose, N_("be verbose")), OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")), OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")), OPT_BOOL(0, "tags", &show_tags, N_("report tags")), OPT_BOOL(0, "root", &show_root, N_("report root nodes")), OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")), OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")), OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")), OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")), OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")), OPT_BOOL(0, "lost-found", &write_lost_and_found, N_("write dangling objects in .git/lost-found")), OPT_BOOL(0, "progress", &show_progress, N_("show progress")), OPT_END(), }; int cmd_fsck(int argc, const char **argv, const char *prefix) { int i, heads; struct alternate_object_database *alt; errors_found = 0; check_replace_refs = 0; argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0); fsck_walk_options.walk = mark_object; fsck_obj_options.walk = mark_used; fsck_obj_options.error_func = fsck_error_func; if (check_strict) fsck_obj_options.strict = 1; if (show_progress == -1) show_progress = isatty(2); if (verbose) show_progress = 0; if (write_lost_and_found) { check_full = 1; include_reflogs = 0; } git_config(fsck_config, NULL); fsck_head_link(); if (!connectivity_only) { fsck_object_dir(get_object_directory()); prepare_alt_odb(); for (alt = alt_odb_list; alt; alt = alt->next) { /* directory name, minus trailing slash */ size_t namelen = alt->name - alt->base - 1; struct strbuf name = STRBUF_INIT; strbuf_add(&name, alt->base, namelen); fsck_object_dir(name.buf); strbuf_release(&name); } } if (check_full) { struct packed_git *p; uint32_t total = 0, count = 0; struct progress *progress = NULL; prepare_packed_git(); if (show_progress) { for (p = packed_git; p; p = p->next) { if (open_pack_index(p)) continue; total += p->num_objects; } progress = start_progress(_("Checking objects"), total); } for (p = packed_git; p; p = p->next) { /* verify gives error messages itself */ if (verify_pack(p, fsck_obj_buffer, progress, count)) errors_found |= ERROR_PACK; count += p->num_objects; } stop_progress(&progress); } 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; }