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![Junio C Hamano](/assets/img/avatar_default.png)
* jc/maint-1.6.0-keep-pack: is_kept_pack(): final clean-up Simplify is_kept_pack() Consolidate ignore_packed logic more has_sha1_kept_pack(): take "struct rev_info" has_sha1_pack(): refactor "pretend these packs do not exist" interface git-repack: resist stray environment variable
682 lines
16 KiB
C
682 lines
16 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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#define REACHABLE 0x0001
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#define SEEN 0x0002
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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;
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static int check_strict;
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static int keep_cache_objects;
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static unsigned char head_sha1[20];
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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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#define ERROR_OBJECT 01
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#define ERROR_REACHABLE 02
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#ifdef NO_D_INO_IN_DIRENT
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#define SORT_DIRENT 0
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#define DIRENT_SORT_HINT(de) 0
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#else
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#define SORT_DIRENT 1
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#define DIRENT_SORT_HINT(de) ((de)->d_ino)
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#endif
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static void objreport(struct object *obj, const char *severity,
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const char *err, va_list params)
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{
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fprintf(stderr, "%s in %s %s: ",
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severity, typename(obj->type), sha1_to_hex(obj->sha1));
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vfprintf(stderr, err, params);
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fputs("\n", stderr);
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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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va_list params;
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va_start(params, err);
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errors_found |= ERROR_OBJECT;
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objreport(obj, "error", err, params);
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va_end(params);
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return -1;
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}
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static int fsck_error_func(struct object *obj, int type, const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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objreport(obj, (type == FSCK_WARN) ? "warning" : "error", err, params);
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va_end(params);
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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)
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{
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struct object *parent = data;
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if (!obj) {
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printf("broken link from %7s %s\n",
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typename(parent->type), sha1_to_hex(parent->sha1));
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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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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->parsed) {
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if (parent && !has_sha1_file(obj->sha1)) {
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printf("broken link from %7s %s\n",
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typename(parent->type), sha1_to_hex(parent->sha1));
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printf(" to %7s %s\n",
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typename(obj->type), sha1_to_hex(obj->sha1));
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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, (void *) parent, &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, 0);
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}
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static int traverse_one_object(struct object *obj, struct object *parent)
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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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obj->parsed = 0;
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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, mark_object, obj);
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if (tree) {
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free(tree->buffer);
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tree->buffer = NULL;
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}
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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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int result = 0;
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while (pending.nr) {
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struct object_array_entry *entry;
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struct object *obj, *parent;
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entry = pending.objects + --pending.nr;
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obj = entry->item;
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parent = (struct object *) entry->name;
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result |= traverse_one_object(obj, parent);
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}
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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)
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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->parsed) {
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if (has_sha1_pack(obj->sha1))
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return; /* it is in pack - forget about it */
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printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
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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), sha1_to_hex(obj->sha1));
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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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printf("dangling %s %s\n", typename(obj->type),
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sha1_to_hex(obj->sha1));
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if (write_lost_and_found) {
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char *filename = git_path("lost-found/%s/%s",
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obj->type == OBJ_COMMIT ? "commit" : "other",
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sha1_to_hex(obj->sha1));
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FILE *f;
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if (safe_create_leading_directories(filename)) {
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error("Could not create lost-found");
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return;
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}
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if (!(f = fopen(filename, "w")))
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die("Could not open %s", filename);
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if (obj->type == OBJ_BLOB) {
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enum object_type type;
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unsigned long size;
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char *buf = read_sha1_file(obj->sha1,
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&type, &size);
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if (buf) {
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if (fwrite(buf, size, 1, f) != 1)
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die("Could not write %s: %s",
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filename, strerror(errno));
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free(buf);
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}
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} else
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fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
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if (fclose(f))
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die("Could not finish %s: %s",
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filename, strerror(errno));
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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", sha1_to_hex(obj->sha1));
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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_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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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), sha1_to_hex(obj->sha1));
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if (fsck_walk(obj, mark_used, 0))
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objerror(obj, "broken links");
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if (fsck_object(obj, check_strict, fsck_error_func))
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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(item->buffer);
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item->buffer = NULL;
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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);
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commit->buffer = NULL;
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if (!commit->parents && show_root)
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printf("root %s\n", sha1_to_hex(commit->object.sha1));
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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), sha1_to_hex(tag->tagged->sha1));
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printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
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}
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}
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return 0;
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}
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/*
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* This is the sorting chunk size: make it reasonably
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* big so that we can sort well..
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*/
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#define MAX_SHA1_ENTRIES (1024)
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struct sha1_entry {
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unsigned long ino;
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unsigned char sha1[20];
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};
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static struct {
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unsigned long nr;
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struct sha1_entry *entry[MAX_SHA1_ENTRIES];
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} sha1_list;
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static int ino_compare(const void *_a, const void *_b)
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{
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const struct sha1_entry *a = _a, *b = _b;
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unsigned long ino1 = a->ino, ino2 = b->ino;
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return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
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}
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static void fsck_sha1_list(void)
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{
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int i, nr = sha1_list.nr;
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if (SORT_DIRENT)
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qsort(sha1_list.entry, nr,
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sizeof(struct sha1_entry *), ino_compare);
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for (i = 0; i < nr; i++) {
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struct sha1_entry *entry = sha1_list.entry[i];
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unsigned char *sha1 = entry->sha1;
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sha1_list.entry[i] = NULL;
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fsck_sha1(sha1);
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free(entry);
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}
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sha1_list.nr = 0;
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}
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static void add_sha1_list(unsigned char *sha1, unsigned long ino)
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{
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struct sha1_entry *entry = xmalloc(sizeof(*entry));
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int nr;
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entry->ino = ino;
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hashcpy(entry->sha1, sha1);
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nr = sha1_list.nr;
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if (nr == MAX_SHA1_ENTRIES) {
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fsck_sha1_list();
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nr = 0;
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}
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sha1_list.entry[nr] = entry;
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sha1_list.nr = ++nr;
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}
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static void fsck_dir(int i, char *path)
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{
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DIR *dir = opendir(path);
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struct dirent *de;
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if (!dir)
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return;
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if (verbose)
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fprintf(stderr, "Checking directory %s\n", path);
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while ((de = readdir(dir)) != NULL) {
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char name[100];
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unsigned char sha1[20];
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if (is_dot_or_dotdot(de->d_name))
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continue;
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if (strlen(de->d_name) == 38) {
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sprintf(name, "%02x", i);
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memcpy(name+2, de->d_name, 39);
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if (get_sha1_hex(name, sha1) < 0)
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break;
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add_sha1_list(sha1, DIRENT_SORT_HINT(de));
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continue;
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}
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if (!prefixcmp(de->d_name, "tmp_obj_"))
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continue;
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fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
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}
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closedir(dir);
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}
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static int default_refs;
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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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struct object *obj;
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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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if (!is_null_sha1(osha1)) {
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obj = lookup_object(osha1);
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if (obj) {
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obj->used = 1;
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mark_object_reachable(obj);
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}
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}
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obj = lookup_object(nsha1);
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if (obj) {
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obj->used = 1;
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mark_object_reachable(obj);
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}
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return 0;
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}
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static int fsck_handle_reflog(const char *logname, const unsigned char *sha1, int flag, void *cb_data)
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{
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for_each_reflog_ent(logname, fsck_handle_reflog_ent, NULL);
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return 0;
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}
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static int is_branch(const char *refname)
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{
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return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
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}
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static int fsck_handle_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct object *obj;
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obj = parse_object(sha1);
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if (!obj) {
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error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
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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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default_refs++;
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obj->used = 1;
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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_sha1(head_sha1))
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fsck_handle_ref("HEAD", head_sha1, 0, NULL);
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for_each_ref(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 void fsck_object_dir(const char *path)
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{
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int i;
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if (verbose)
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fprintf(stderr, "Checking object directory\n");
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for (i = 0; i < 256; i++) {
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static char dir[4096];
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sprintf(dir, "%s/%02x", path, i);
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fsck_dir(i, dir);
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}
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fsck_sha1_list();
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}
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static int fsck_head_link(void)
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{
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int flag;
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int null_is_error = 0;
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if (verbose)
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fprintf(stderr, "Checking HEAD link\n");
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head_points_at = resolve_ref("HEAD", head_sha1, 0, &flag);
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if (!head_points_at)
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return error("Invalid HEAD");
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if (!strcmp(head_points_at, "HEAD"))
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/* detached HEAD */
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null_is_error = 1;
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else if (prefixcmp(head_points_at, "refs/heads/"))
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return error("HEAD points to something strange (%s)",
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head_points_at);
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if (is_null_sha1(head_sha1)) {
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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 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;
|
|
|
|
argc = parse_options(argc, argv, 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;
|
|
}
|