fsck-cache.c

   1 #include "cache.h"
   2
   3 #include <sys/types.h>
   4 #include <dirent.h>
   5
   6 /*
   7  * These three functions should build up a graph in memory about
   8  * what objects we've referenced, and found, and types..
   9  *
  10  * Right now we don't do that kind of reachability checking. Yet.
  11  */
  12 static void fsck_tree(void *data, unsigned long size)
  13 {
  14 }
  15
  16 static void fsck_commit(void *data, unsigned long size)
  17 {
  18 }
  19
  20 static int mark_sha1_seen(unsigned char *sha1, char *tag)
  21 {
  22         return 0;
  23 }
  24
  25 static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
  26 {
  27         if (!strcmp(tag, "blob"))
  28                 /* Nothing to check */;
  29         else if (!strcmp(tag, "tree"))
  30                 fsck_tree(data, size);
  31         else if (!strcmp(tag, "commit"))
  32                 fsck_commit(data, size);
  33         else
  34                 return -1;
  35         return mark_sha1_seen(sha1, tag);
  36 }
  37
  38 static int fsck_name(char *hex)
  39 {
  40         unsigned char sha1[20];
  41         if (!get_sha1_hex(hex, sha1)) {
  42                 unsigned long mapsize;
  43                 void *map = map_sha1_file(sha1, &mapsize);
  44                 if (map) {
  45                         char type[100];
  46                         unsigned long size;
  47                         void *buffer = NULL;
  48                         if (!check_sha1_signature(sha1, map, mapsize))
  49                                 buffer = unpack_sha1_file(map, mapsize, type, &size);
  50                         munmap(map, mapsize);
  51                         if (buffer && !fsck_entry(sha1, type, buffer, size))
  52                                 return 0;
  53                 }
  54         }
  55         return -1;
  56 }
  57
  58 static int fsck_dir(int i, char *path)
  59 {
  60         DIR *dir = opendir(path);
  61         struct dirent *de;
  62
  63         if (!dir) {
  64                 fprintf(stderr, "missing sha1 directory '%s'", path);
  65                 return -1;
  66         }
  67
  68         while ((de = readdir(dir)) != NULL) {
  69                 char name[100];
  70                 int len = strlen(de->d_name);
  71
  72                 switch (len) {
  73                 case 2:
  74                         if (de->d_name[1] != '.')
  75                                 break;
  76                 case 1:
  77                         if (de->d_name[0] != '.')
  78                                 break;
  79                         continue;
  80                 case 38:
  81                         sprintf(name, "%02x", i);
  82                         memcpy(name+2, de->d_name, len+1);
  83                         if (!fsck_name(name))
  84                                 continue;
  85                 }
  86                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  87         }
  88         closedir(dir);
  89         return 0;
  90 }
  91
  92 int main(int argc, char **argv)
  93 {
  94         int i;
  95         char *sha1_dir;
  96
  97         if (argc != 1)
  98                 usage("fsck-cache");
  99         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 100         for (i = 0; i < 256; i++) {
 101                 static char dir[4096];
 102                 sprintf(dir, "%s/%02x", sha1_dir, i);
 103                 fsck_dir(i, dir);
 104         }
 105         return 0;
 106 }