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Add first cut at "fsck-cache" that validates the SHA1 object store.
It doesn't complain about mine. But it also doesn't yet check for inter-object reachability etc.
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106
fsck-cache.c
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106
fsck-cache.c
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#include "cache.h"
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#include <sys/types.h>
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#include <dirent.h>
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/*
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* These three functions should build up a graph in memory about
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* what objects we've referenced, and found, and types..
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*
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* Right now we don't do that kind of reachability checking. Yet.
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*/
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static void fsck_tree(void *data, unsigned long size)
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{
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}
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static void fsck_commit(void *data, unsigned long size)
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{
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}
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static int mark_sha1_seen(unsigned char *sha1, char *tag)
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{
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return 0;
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}
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static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
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{
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if (!strcmp(tag, "blob"))
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/* Nothing to check */;
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else if (!strcmp(tag, "tree"))
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fsck_tree(data, size);
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else if (!strcmp(tag, "commit"))
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fsck_commit(data, size);
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else
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return -1;
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return mark_sha1_seen(sha1, tag);
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}
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static int fsck_name(char *hex)
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{
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unsigned char sha1[20];
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if (!get_sha1_hex(hex, sha1)) {
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unsigned long mapsize;
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void *map = map_sha1_file(sha1, &mapsize);
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if (map) {
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char type[100];
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unsigned long size;
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void *buffer = NULL;
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if (!check_sha1_signature(sha1, map, mapsize))
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buffer = unpack_sha1_file(map, mapsize, type, &size);
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munmap(map, mapsize);
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if (buffer && !fsck_entry(sha1, type, buffer, size))
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return 0;
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}
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}
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return -1;
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}
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static int 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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fprintf(stderr, "missing sha1 directory '%s'", path);
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return -1;
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}
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while ((de = readdir(dir)) != NULL) {
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char name[100];
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int len = strlen(de->d_name);
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switch (len) {
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case 2:
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if (de->d_name[1] != '.')
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break;
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case 1:
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if (de->d_name[0] != '.')
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break;
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continue;
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case 38:
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sprintf(name, "%02x", i);
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memcpy(name+2, de->d_name, len+1);
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if (!fsck_name(name))
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continue;
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}
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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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return 0;
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}
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int main(int argc, char **argv)
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{
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int i;
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char *sha1_dir;
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if (argc != 1)
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usage("fsck-cache");
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sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
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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", sha1_dir, i);
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fsck_dir(i, dir);
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}
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return 0;
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}
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