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#include "cache.h"
#include <sys/types.h>
#include <dirent.h>
/*
* These two functions should build up a graph in memory about
* what objects we've referenced, and found, and types..
*
* Right now we don't do that kind of reachability checking. Yet.
*/
static void mark_needs_sha1(unsigned char *parent, const char * type, unsigned char *child)
{
}
static int mark_sha1_seen(unsigned char *sha1, char *tag)
{
return 0;
}
static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
{
while (size) {
int len = 1+strlen(data);
unsigned char *file_sha1 = data + len;
char *path = strchr(data, ' ');
if (size < len + 20 || !path)
return -1;
data += len + 20;
size -= len + 20;
mark_needs_sha1(sha1, "blob", file_sha1);
}
return 0;
}
static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
{
int parents;
unsigned char tree_sha1[20];
unsigned char parent_sha1[20];
if (memcmp(data, "tree ", 5))
return -1;
if (get_sha1_hex(data + 5, tree_sha1) < 0)
return -1;
mark_needs_sha1(sha1, "tree", tree_sha1);
data += 5 + 40 + 1; /* "tree " + <hex sha1> + '\n' */
parents = 0;
while (!memcmp(data, "parent ", 7)) {
if (get_sha1_hex(data + 7, parent_sha1) < 0)
return -1;
mark_needs_sha1(sha1, "commit", parent_sha1);
data += 7 + 40 + 1; /* "parent " + <hex sha1> + '\n' */
parents++;
}
if (!parents)
printf("root: %s\n", sha1_to_hex(sha1));
return 0;
}
static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
{
if (!strcmp(tag, "blob")) {
/* Nothing to check */;
} else if (!strcmp(tag, "tree")) {
if (fsck_tree(sha1, data, size) < 0)
return -1;
} else if (!strcmp(tag, "commit")) {
if (fsck_commit(sha1, data, size) < 0)
return -1;
} else
return -1;
return mark_sha1_seen(sha1, tag);
}
static int fsck_name(char *hex)
{
unsigned char sha1[20];
if (!get_sha1_hex(hex, sha1)) {
unsigned long mapsize;
void *map = map_sha1_file(sha1, &mapsize);
if (map) {
char type[100];
unsigned long size;
void *buffer = NULL;
if (!check_sha1_signature(sha1, map, mapsize))
buffer = unpack_sha1_file(map, mapsize, type, &size);
munmap(map, mapsize);
if (buffer && !fsck_entry(sha1, type, buffer, size))
return 0;
}
}
return -1;
}
static int fsck_dir(int i, char *path)
{
DIR *dir = opendir(path);
struct dirent *de;
if (!dir) {
fprintf(stderr, "missing sha1 directory '%s'", path);
return -1;
}
while ((de = readdir(dir)) != NULL) {
char name[100];
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 (!fsck_name(name))
continue;
}
fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
}
closedir(dir);
return 0;
}
int main(int argc, char **argv)
{
int i;
char *sha1_dir;
if (argc != 1)
usage("fsck-cache");
sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
for (i = 0; i < 256; i++) {
static char dir[4096];
sprintf(dir, "%s/%02x", sha1_dir, i);
fsck_dir(i, dir);
}
return 0;
}
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