mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
"git pack-objects" and "git index-pack" mostly operate with off_t when talking about the offset of objects in a packfile, but there were a handful of places that used "unsigned long" to hold that value, leading to an unintended truncation. * nd/pack-ofs-4gb-limit: fsck: use streaming interface for large blobs in pack pack-objects: do not truncate result in-pack object size on 32-bit systems index-pack: correct "offset" type in unpack_entry_data() index-pack: report correct bad object offsets even if they are large index-pack: correct "len" type in unpack_data() sha1_file.c: use type off_t* for object_info->disk_sizep pack-objects: pass length to check_pack_crc() without truncation
743 lines
18 KiB
C
743 lines
18 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "commit.h"
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#include "tree.h"
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#include "blob.h"
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#include "tag.h"
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#include "refs.h"
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#include "pack.h"
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#include "cache-tree.h"
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#include "tree-walk.h"
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#include "fsck.h"
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#include "parse-options.h"
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#include "dir.h"
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#include "progress.h"
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#include "streaming.h"
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#include "decorate.h"
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#define REACHABLE 0x0001
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#define SEEN 0x0002
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#define HAS_OBJ 0x0004
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static int show_root;
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static int show_tags;
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static int show_unreachable;
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static int include_reflogs = 1;
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static int check_full = 1;
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static int connectivity_only;
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static int check_strict;
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static int keep_cache_objects;
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static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
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static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
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static struct object_id head_oid;
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static const char *head_points_at;
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static int errors_found;
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static int write_lost_and_found;
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static int verbose;
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static int show_progress = -1;
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static int show_dangling = 1;
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static int name_objects;
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#define ERROR_OBJECT 01
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#define ERROR_REACHABLE 02
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#define ERROR_PACK 04
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#define ERROR_REFS 010
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static const char *describe_object(struct object *obj)
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{
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static struct strbuf buf = STRBUF_INIT;
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char *name = name_objects ?
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lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
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strbuf_reset(&buf);
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strbuf_addstr(&buf, oid_to_hex(&obj->oid));
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if (name)
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strbuf_addf(&buf, " (%s)", name);
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return buf.buf;
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}
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static int fsck_config(const char *var, const char *value, void *cb)
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{
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if (strcmp(var, "fsck.skiplist") == 0) {
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const char *path;
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struct strbuf sb = STRBUF_INIT;
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if (git_config_pathname(&path, var, value))
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return 1;
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strbuf_addf(&sb, "skiplist=%s", path);
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free((char *)path);
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fsck_set_msg_types(&fsck_obj_options, sb.buf);
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strbuf_release(&sb);
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return 0;
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}
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if (skip_prefix(var, "fsck.", &var)) {
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fsck_set_msg_type(&fsck_obj_options, var, value);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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static void objreport(struct object *obj, const char *msg_type,
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const char *err)
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{
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fprintf(stderr, "%s in %s %s: %s\n",
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msg_type, typename(obj->type), describe_object(obj), err);
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}
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static int objerror(struct object *obj, const char *err)
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{
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errors_found |= ERROR_OBJECT;
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objreport(obj, "error", err);
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return -1;
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}
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static int fsck_error_func(struct fsck_options *o,
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struct object *obj, int type, const char *message)
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{
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objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
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return (type == FSCK_WARN) ? 0 : 1;
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}
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static struct object_array pending;
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static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
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{
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struct object *parent = data;
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/*
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* The only case data is NULL or type is OBJ_ANY is when
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* mark_object_reachable() calls us. All the callers of
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* that function has non-NULL obj hence ...
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*/
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if (!obj) {
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/* ... these references to parent->fld are safe here */
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printf("broken link from %7s %s\n",
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typename(parent->type), describe_object(parent));
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printf("broken link from %7s %s\n",
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(type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
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errors_found |= ERROR_REACHABLE;
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return 1;
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}
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if (type != OBJ_ANY && obj->type != type)
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/* ... and the reference to parent is safe here */
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objerror(parent, "wrong object type in link");
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if (obj->flags & REACHABLE)
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return 0;
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obj->flags |= REACHABLE;
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if (!(obj->flags & HAS_OBJ)) {
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if (parent && !has_object_file(&obj->oid)) {
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printf("broken link from %7s %s\n",
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typename(parent->type), describe_object(parent));
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printf(" to %7s %s\n",
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typename(obj->type), describe_object(obj));
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errors_found |= ERROR_REACHABLE;
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}
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return 1;
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}
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add_object_array(obj, NULL, &pending);
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return 0;
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}
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static void mark_object_reachable(struct object *obj)
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{
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mark_object(obj, OBJ_ANY, NULL, NULL);
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}
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static int traverse_one_object(struct object *obj)
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{
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int result;
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struct tree *tree = NULL;
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if (obj->type == OBJ_TREE) {
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tree = (struct tree *)obj;
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if (parse_tree(tree) < 0)
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return 1; /* error already displayed */
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}
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result = fsck_walk(obj, obj, &fsck_walk_options);
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if (tree)
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free_tree_buffer(tree);
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return result;
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}
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static int traverse_reachable(void)
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{
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struct progress *progress = NULL;
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unsigned int nr = 0;
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int result = 0;
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if (show_progress)
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progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
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while (pending.nr) {
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struct object_array_entry *entry;
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struct object *obj;
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entry = pending.objects + --pending.nr;
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obj = entry->item;
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result |= traverse_one_object(obj);
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display_progress(progress, ++nr);
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}
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stop_progress(&progress);
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return !!result;
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}
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static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
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{
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if (!obj)
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return 1;
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obj->used = 1;
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return 0;
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}
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/*
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* Check a single reachable object
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*/
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static void check_reachable_object(struct object *obj)
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{
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/*
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* We obviously want the object to be parsed,
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* except if it was in a pack-file and we didn't
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* do a full fsck
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*/
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if (!(obj->flags & HAS_OBJ)) {
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if (has_sha1_pack(obj->oid.hash))
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return; /* it is in pack - forget about it */
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if (connectivity_only && has_object_file(&obj->oid))
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return;
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printf("missing %s %s\n", typename(obj->type),
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describe_object(obj));
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errors_found |= ERROR_REACHABLE;
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return;
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}
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}
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/*
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* Check a single unreachable object
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*/
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static void check_unreachable_object(struct object *obj)
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{
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/*
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* Missing unreachable object? Ignore it. It's not like
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* we miss it (since it can't be reached), nor do we want
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* to complain about it being unreachable (since it does
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* not exist).
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*/
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if (!obj->parsed)
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return;
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/*
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* Unreachable object that exists? Show it if asked to,
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* since this is something that is prunable.
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*/
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if (show_unreachable) {
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printf("unreachable %s %s\n", typename(obj->type),
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describe_object(obj));
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return;
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}
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/*
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* "!used" means that nothing at all points to it, including
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* other unreachable objects. In other words, it's the "tip"
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* of some set of unreachable objects, usually a commit that
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* got dropped.
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*
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* Such starting points are more interesting than some random
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* set of unreachable objects, so we show them even if the user
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* hasn't asked for _all_ unreachable objects. If you have
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* deleted a branch by mistake, this is a prime candidate to
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* start looking at, for example.
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*/
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if (!obj->used) {
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if (show_dangling)
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printf("dangling %s %s\n", typename(obj->type),
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describe_object(obj));
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if (write_lost_and_found) {
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char *filename = git_pathdup("lost-found/%s/%s",
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obj->type == OBJ_COMMIT ? "commit" : "other",
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describe_object(obj));
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FILE *f;
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if (safe_create_leading_directories_const(filename)) {
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error("Could not create lost-found");
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free(filename);
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return;
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}
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if (!(f = fopen(filename, "w")))
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die_errno("Could not open '%s'", filename);
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if (obj->type == OBJ_BLOB) {
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if (stream_blob_to_fd(fileno(f), obj->oid.hash, NULL, 1))
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die_errno("Could not write '%s'", filename);
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} else
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fprintf(f, "%s\n", describe_object(obj));
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if (fclose(f))
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die_errno("Could not finish '%s'",
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filename);
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free(filename);
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}
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return;
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}
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/*
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* Otherwise? It's there, it's unreachable, and some other unreachable
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* object points to it. Ignore it - it's not interesting, and we showed
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* all the interesting cases above.
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*/
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}
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static void check_object(struct object *obj)
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{
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if (verbose)
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fprintf(stderr, "Checking %s\n", describe_object(obj));
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if (obj->flags & REACHABLE)
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check_reachable_object(obj);
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else
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check_unreachable_object(obj);
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}
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static void check_connectivity(void)
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{
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int i, max;
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/* Traverse the pending reachable objects */
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traverse_reachable();
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/* Look up all the requirements, warn about missing objects.. */
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max = get_max_object_index();
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if (verbose)
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fprintf(stderr, "Checking connectivity (%d objects)\n", max);
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for (i = 0; i < max; i++) {
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struct object *obj = get_indexed_object(i);
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if (obj)
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check_object(obj);
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}
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}
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static int fsck_obj(struct object *obj)
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{
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if (obj->flags & SEEN)
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return 0;
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obj->flags |= SEEN;
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if (verbose)
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fprintf(stderr, "Checking %s %s\n",
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typename(obj->type), describe_object(obj));
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if (fsck_walk(obj, NULL, &fsck_obj_options))
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objerror(obj, "broken links");
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if (fsck_object(obj, NULL, 0, &fsck_obj_options))
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return -1;
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if (obj->type == OBJ_TREE) {
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struct tree *item = (struct tree *) obj;
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free_tree_buffer(item);
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}
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if (obj->type == OBJ_COMMIT) {
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struct commit *commit = (struct commit *) obj;
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free_commit_buffer(commit);
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if (!commit->parents && show_root)
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printf("root %s\n", describe_object(&commit->object));
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}
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if (obj->type == OBJ_TAG) {
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struct tag *tag = (struct tag *) obj;
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if (show_tags && tag->tagged) {
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printf("tagged %s %s", typename(tag->tagged->type),
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describe_object(tag->tagged));
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printf(" (%s) in %s\n", tag->tag,
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describe_object(&tag->object));
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}
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}
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return 0;
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}
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static int fsck_sha1(const unsigned char *sha1)
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{
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struct object *obj = parse_object(sha1);
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if (!obj) {
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errors_found |= ERROR_OBJECT;
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return error("%s: object corrupt or missing",
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sha1_to_hex(sha1));
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}
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obj->flags |= HAS_OBJ;
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return fsck_obj(obj);
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}
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static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
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unsigned long size, void *buffer, int *eaten)
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{
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/*
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* Note, buffer may be NULL if type is OBJ_BLOB. See
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* verify_packfile(), data_valid variable for details.
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*/
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struct object *obj;
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obj = parse_object_buffer(sha1, type, size, buffer, eaten);
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if (!obj) {
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errors_found |= ERROR_OBJECT;
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return error("%s: object corrupt or missing", sha1_to_hex(sha1));
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}
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obj->flags = HAS_OBJ;
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return fsck_obj(obj);
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}
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static int default_refs;
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static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1,
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unsigned long timestamp)
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{
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struct object *obj;
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if (!is_null_sha1(sha1)) {
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obj = lookup_object(sha1);
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if (obj) {
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if (timestamp && name_objects)
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add_decoration(fsck_walk_options.object_names,
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obj,
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xstrfmt("%s@{%ld}", refname, timestamp));
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obj->used = 1;
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mark_object_reachable(obj);
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} else {
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error("%s: invalid reflog entry %s", refname, sha1_to_hex(sha1));
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errors_found |= ERROR_REACHABLE;
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}
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}
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}
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static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
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const char *email, unsigned long timestamp, int tz,
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const char *message, void *cb_data)
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{
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const char *refname = cb_data;
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if (verbose)
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fprintf(stderr, "Checking reflog %s->%s\n",
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sha1_to_hex(osha1), sha1_to_hex(nsha1));
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fsck_handle_reflog_sha1(refname, osha1, 0);
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fsck_handle_reflog_sha1(refname, nsha1, timestamp);
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return 0;
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}
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static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
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int flag, void *cb_data)
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{
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for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
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return 0;
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}
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static int fsck_handle_ref(const char *refname, const struct object_id *oid,
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int flag, void *cb_data)
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{
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struct object *obj;
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obj = parse_object(oid->hash);
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if (!obj) {
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error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
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errors_found |= ERROR_REACHABLE;
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/* We'll continue with the rest despite the error.. */
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return 0;
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}
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if (obj->type != OBJ_COMMIT && is_branch(refname)) {
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error("%s: not a commit", refname);
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errors_found |= ERROR_REFS;
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}
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default_refs++;
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obj->used = 1;
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if (name_objects)
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add_decoration(fsck_walk_options.object_names,
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obj, xstrdup(refname));
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mark_object_reachable(obj);
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return 0;
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}
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static void get_default_heads(void)
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{
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if (head_points_at && !is_null_oid(&head_oid))
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fsck_handle_ref("HEAD", &head_oid, 0, NULL);
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for_each_rawref(fsck_handle_ref, NULL);
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if (include_reflogs)
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for_each_reflog(fsck_handle_reflog, NULL);
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/*
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* Not having any default heads isn't really fatal, but
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* it does mean that "--unreachable" no longer makes any
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* sense (since in this case everything will obviously
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* be unreachable by definition.
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*
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* Showing dangling objects is valid, though (as those
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* dangling objects are likely lost heads).
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*
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* So we just print a warning about it, and clear the
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* "show_unreachable" flag.
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*/
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if (!default_refs) {
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fprintf(stderr, "notice: No default references\n");
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show_unreachable = 0;
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}
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}
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static int fsck_loose(const unsigned char *sha1, const char *path, void *data)
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{
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if (fsck_sha1(sha1))
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errors_found |= ERROR_OBJECT;
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return 0;
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}
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static int fsck_cruft(const char *basename, const char *path, void *data)
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{
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if (!starts_with(basename, "tmp_obj_"))
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fprintf(stderr, "bad sha1 file: %s\n", path);
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return 0;
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}
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static int fsck_subdir(int nr, const char *path, void *progress)
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{
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display_progress(progress, nr + 1);
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return 0;
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}
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static void fsck_object_dir(const char *path)
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{
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struct progress *progress = NULL;
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if (verbose)
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fprintf(stderr, "Checking object directory\n");
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if (show_progress)
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progress = start_progress(_("Checking object directories"), 256);
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for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
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progress);
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display_progress(progress, 256);
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stop_progress(&progress);
|
|
}
|
|
|
|
static int fsck_head_link(void)
|
|
{
|
|
int null_is_error = 0;
|
|
|
|
if (verbose)
|
|
fprintf(stderr, "Checking HEAD link\n");
|
|
|
|
head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
|
|
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;
|
|
if (name_objects)
|
|
add_decoration(fsck_walk_options.object_names,
|
|
obj, xstrdup(":"));
|
|
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_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
|
|
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;
|
|
}
|
|
|
|
if (name_objects)
|
|
fsck_walk_options.object_names =
|
|
xcalloc(1, sizeof(struct decoration));
|
|
|
|
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;
|
|
if (name_objects)
|
|
add_decoration(fsck_walk_options.object_names,
|
|
obj, xstrdup(arg));
|
|
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;
|
|
if (name_objects)
|
|
add_decoration(fsck_walk_options.object_names,
|
|
obj,
|
|
xstrfmt(":%s", active_cache[i]->name));
|
|
mark_object_reachable(obj);
|
|
}
|
|
if (active_cache_tree)
|
|
fsck_cache_tree(active_cache_tree);
|
|
}
|
|
|
|
check_connectivity();
|
|
return errors_found;
|
|
}
|