git/fsck-cache.c

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C
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#include <sys/types.h>
#include <dirent.h>
#include "cache.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "tag.h"
#include "delta.h"
#define REACHABLE 0x0001
static int show_root = 0;
static int show_tags = 0;
static int show_unreachable = 0;
static int show_max_delta_depth = 0;
static int keep_cache_objects = 0;
static unsigned char head_sha1[20];
static void expand_deltas(void)
{
int i, max_depth = 0;
/*
* To be as efficient as possible we look for delta heads and
* recursively process them going backward, and parsing
* resulting objects along the way. This allows for processing
* each delta objects only once regardless of the delta depth.
*/
for (i = 0; i < nr_objs; i++) {
struct object *obj = objs[i];
if (obj->parsed && !obj->delta && obj->attached_deltas) {
int depth = 0;
char type[10];
unsigned long size;
void *buf = read_sha1_file(obj->sha1, type, &size);
if (!buf)
continue;
depth = process_deltas(buf, size, obj->type,
obj->attached_deltas);
if (max_depth < depth)
max_depth = depth;
}
}
if (show_max_delta_depth)
printf("maximum delta depth = %d\n", max_depth);
}
static void check_connectivity(void)
{
int i;
/* Look up all the requirements, warn about missing objects.. */
for (i = 0; i < nr_objs; i++) {
struct object *obj = objs[i];
struct object_list *refs;
if (!obj->parsed) {
if (obj->delta)
printf("unresolved delta %s\n",
sha1_to_hex(obj->sha1));
else
printf("missing %s %s\n",
obj->type, sha1_to_hex(obj->sha1));
continue;
}
for (refs = obj->refs; refs; refs = refs->next) {
if (refs->item->parsed)
continue;
printf("broken link from %7s %s\n",
obj->type, sha1_to_hex(obj->sha1));
printf(" to %7s %s\n",
refs->item->type, sha1_to_hex(refs->item->sha1));
}
if (show_unreachable && !(obj->flags & REACHABLE)) {
if (obj->attached_deltas)
printf("foreign delta reference %s\n",
sha1_to_hex(obj->sha1));
else
printf("unreachable %s %s\n",
obj->type, sha1_to_hex(obj->sha1));
continue;
}
if (!obj->used) {
printf("dangling %s %s\n", obj->type,
sha1_to_hex(obj->sha1));
}
}
}
/*
* The entries in a tree are ordered in the _path_ order,
* which means that a directory entry is ordered by adding
* a slash to the end of it.
*
* So a directory called "a" is ordered _after_ a file
* called "a.c", because "a/" sorts after "a.c".
*/
#define TREE_UNORDERED (-1)
#define TREE_HAS_DUPS (-2)
static int verify_ordered(struct tree_entry_list *a, struct tree_entry_list *b)
{
int len1 = strlen(a->name);
int len2 = strlen(b->name);
int len = len1 < len2 ? len1 : len2;
unsigned char c1, c2;
int cmp;
cmp = memcmp(a->name, b->name, len);
if (cmp < 0)
return 0;
if (cmp > 0)
return TREE_UNORDERED;
/*
* Ok, the first <len> characters are the same.
* Now we need to order the next one, but turn
* a '\0' into a '/' for a directory entry.
*/
c1 = a->name[len];
c2 = b->name[len];
if (!c1 && !c2)
/*
* git-write-tree used to write out a nonsense tree that has
* entries with the same name, one blob and one tree. Make
* sure we do not have duplicate entries.
*/
return TREE_HAS_DUPS;
if (!c1 && a->directory)
c1 = '/';
if (!c2 && b->directory)
c2 = '/';
return c1 < c2 ? 0 : TREE_UNORDERED;
}
static int fsck_tree(struct tree *item)
{
int has_full_path = 0;
struct tree_entry_list *entry, *last;
last = NULL;
for (entry = item->entries; entry; entry = entry->next) {
if (strchr(entry->name, '/'))
has_full_path = 1;
switch (entry->mode) {
/*
* Standard modes..
*/
case S_IFREG | 0755:
case S_IFREG | 0644:
case S_IFLNK:
case S_IFDIR:
break;
/*
* This is nonstandard, but we had a few of these
* early on when we honored the full set of mode
* bits..
*/
case S_IFREG | 0664:
break;
default:
printf("tree %s has entry %o %s\n",
sha1_to_hex(item->object.sha1),
entry->mode, entry->name);
}
if (last) {
switch (verify_ordered(last, entry)) {
case TREE_UNORDERED:
fprintf(stderr, "tree %s not ordered\n",
sha1_to_hex(item->object.sha1));
return -1;
case TREE_HAS_DUPS:
fprintf(stderr, "tree %s has duplicate entries for '%s'\n",
sha1_to_hex(item->object.sha1),
entry->name);
return -1;
default:
break;
}
}
last = entry;
}
if (has_full_path) {
fprintf(stderr, "warning: git-fsck-cache: tree %s "
"has full pathnames in it\n",
sha1_to_hex(item->object.sha1));
}
return 0;
}
static int fsck_commit(struct commit *commit)
{
free(commit->buffer);
commit->buffer = NULL;
if (!commit->tree)
return -1;
if (!commit->parents && show_root)
printf("root %s\n", sha1_to_hex(commit->object.sha1));
if (!commit->date)
printf("bad commit date in %s\n",
sha1_to_hex(commit->object.sha1));
return 0;
}
static int fsck_tag(struct tag *tag)
{
struct object *tagged = tag->tagged;
if (!tagged) {
printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
return -1;
}
if (!show_tags)
return 0;
printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
return 0;
}
static int fsck_sha1(unsigned char *sha1)
{
struct object *obj = parse_object(sha1);
if (!obj)
return -1;
if (obj->type == blob_type)
return 0;
if (obj->type == tree_type)
return fsck_tree((struct tree *) obj);
if (obj->type == commit_type)
return fsck_commit((struct commit *) obj);
if (obj->type == tag_type)
return fsck_tag((struct tag *) obj);
if (!obj->type && obj->delta)
return 0;
return -1;
}
/*
* This is the sorting chunk size: make it reasonably
* big so that we can sort well..
*/
#define MAX_SHA1_ENTRIES (1024)
struct sha1_entry {
unsigned long ino;
unsigned char sha1[20];
};
static struct {
unsigned long nr;
struct sha1_entry *entry[MAX_SHA1_ENTRIES];
} sha1_list;
static int ino_compare(const void *_a, const void *_b)
{
const struct sha1_entry *a = _a, *b = _b;
unsigned long ino1 = a->ino, ino2 = b->ino;
return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
}
static void fsck_sha1_list(void)
{
int i, nr = sha1_list.nr;
qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
for (i = 0; i < nr; i++) {
struct sha1_entry *entry = sha1_list.entry[i];
unsigned char *sha1 = entry->sha1;
sha1_list.entry[i] = NULL;
if (fsck_sha1(sha1) < 0)
fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
free(entry);
}
sha1_list.nr = 0;
}
static void add_sha1_list(unsigned char *sha1, unsigned long ino)
{
struct sha1_entry *entry = xmalloc(sizeof(*entry));
int nr;
entry->ino = ino;
memcpy(entry->sha1, sha1, 20);
nr = sha1_list.nr;
if (nr == MAX_SHA1_ENTRIES) {
fsck_sha1_list();
nr = 0;
}
sha1_list.entry[nr] = entry;
sha1_list.nr = ++nr;
}
static int fsck_dir(int i, char *path)
{
DIR *dir = opendir(path);
struct dirent *de;
if (!dir) {
return error("missing sha1 directory '%s'", path);
}
while ((de = readdir(dir)) != NULL) {
char name[100];
unsigned char sha1[20];
int len = strlen(de->d_name);
switch (len) {
case 2:
if (de->d_name[1] != '.')
break;
case 1:
if (de->d_name[0] != '.')
break;
continue;
case 38:
sprintf(name, "%02x", i);
memcpy(name+2, de->d_name, len+1);
if (get_sha1_hex(name, sha1) < 0)
break;
add_sha1_list(sha1, de->d_ino);
continue;
}
fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
}
closedir(dir);
return 0;
}
static int read_sha1_reference(const char *path)
{
char hexname[60];
unsigned char sha1[20];
int fd = open(path, O_RDONLY), len;
struct object *obj;
if (fd < 0)
return -1;
len = read(fd, hexname, sizeof(hexname));
close(fd);
if (len < 40)
return -1;
if (get_sha1_hex(hexname, sha1) < 0)
return -1;
obj = lookup_object(sha1);
if (!obj)
return error("%s: invalid sha1 pointer %.40s", path, hexname);
obj->used = 1;
mark_reachable(obj, REACHABLE);
return 0;
}
static int find_file_objects(const char *base, const char *name)
{
int baselen = strlen(base);
int namelen = strlen(name);
char *path = xmalloc(baselen + namelen + 2);
struct stat st;
memcpy(path, base, baselen);
path[baselen] = '/';
memcpy(path + baselen + 1, name, namelen+1);
if (stat(path, &st) < 0)
return 0;
/*
* Recurse into directories
*/
if (S_ISDIR(st.st_mode)) {
int count = 0;
DIR *dir = opendir(path);
if (dir) {
struct dirent *de;
while ((de = readdir(dir)) != NULL) {
if (de->d_name[0] == '.')
continue;
count += find_file_objects(path, de->d_name);
}
closedir(dir);
}
return count;
}
if (S_ISREG(st.st_mode))
return read_sha1_reference(path) == 0;
return 0;
}
static void get_default_heads(void)
{
char *git_dir = gitenv(GIT_DIR_ENVIRONMENT) ? : DEFAULT_GIT_DIR_ENVIRONMENT;
int count = find_file_objects(git_dir, "refs");
if (!count)
die("No default references");
}
int main(int argc, char **argv)
{
int i, heads;
char *sha1_dir;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "--unreachable")) {
show_unreachable = 1;
continue;
}
if (!strcmp(arg, "--tags")) {
show_tags = 1;
continue;
}
if (!strcmp(arg, "--root")) {
show_root = 1;
continue;
}
if (!strcmp(arg, "--delta-depth")) {
show_max_delta_depth = 1;
continue;
}
if (!strcmp(arg, "--cache")) {
keep_cache_objects = 1;
continue;
}
if (*arg == '-')
usage("git-fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
}
sha1_dir = get_object_directory();
for (i = 0; i < 256; i++) {
static char dir[4096];
sprintf(dir, "%s/%02x", sha1_dir, i);
fsck_dir(i, dir);
}
fsck_sha1_list();
expand_deltas();
heads = 0;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (*arg == '-')
continue;
if (!get_sha1(arg, head_sha1)) {
struct object *obj = lookup_object(head_sha1);
/* Error is printed by lookup_object(). */
if (!obj)
continue;
obj->used = 1;
mark_reachable(obj, REACHABLE);
heads++;
continue;
}
error("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) {
int i;
read_cache();
for (i = 0; i < active_nr; i++) {
struct blob *blob = lookup_blob(active_cache[i]->sha1);
struct object *obj;
if (!blob)
continue;
obj = &blob->object;
obj->used = 1;
mark_reachable(obj, REACHABLE);
}
}
check_connectivity();
return 0;
}