Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3#include <sys/types.h>
   4#include <dirent.h>
   5
   6/*
   7 * These two 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 */
  12static void mark_needs_sha1(unsigned char *parent, const char * type, unsigned char *child)
  13{
  14}
  15
  16static int mark_sha1_seen(unsigned char *sha1, char *tag)
  17{
  18        return 0;
  19}
  20
  21static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
  22{
  23        while (size) {
  24                int len = 1+strlen(data);
  25                unsigned char *file_sha1 = data + len;
  26                char *path = strchr(data, ' ');
  27                if (size < len + 20 || !path)
  28                        return -1;
  29                data += len + 20;
  30                size -= len + 20;
  31                mark_needs_sha1(sha1, "blob", file_sha1);
  32        }
  33        return 0;
  34}
  35
  36static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
  37{
  38        unsigned char tree_sha1[20];
  39        unsigned char parent_sha1[20];
  40
  41        if (memcmp(data, "tree ", 5))
  42                return -1;
  43        if (get_sha1_hex(data + 5, tree_sha1) < 0)
  44                return -1;
  45        mark_needs_sha1(sha1, "tree", tree_sha1);
  46        data += 5 + 40 + 1;     /* "tree " + <hex sha1> + '\n' */
  47        while (!memcmp(data, "parent ", 7)) {
  48                if (get_sha1_hex(data + 7, parent_sha1) < 0)
  49                        return -1;
  50                mark_needs_sha1(sha1, "commit", parent_sha1);
  51                data += 7 + 40 + 1;     /* "parent " + <hex sha1> + '\n' */
  52        }
  53        return 0;
  54}
  55
  56static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
  57{
  58        if (!strcmp(tag, "blob")) {
  59                /* Nothing to check */;
  60        } else if (!strcmp(tag, "tree")) {
  61                if (fsck_tree(sha1, data, size) < 0)
  62                        return -1;
  63        } else if (!strcmp(tag, "commit")) {
  64                if (fsck_commit(sha1, data, size) < 0)
  65                        return -1;
  66        } else
  67                return -1;
  68        return mark_sha1_seen(sha1, tag);
  69}
  70
  71static int fsck_name(char *hex)
  72{
  73        unsigned char sha1[20];
  74        if (!get_sha1_hex(hex, sha1)) {
  75                unsigned long mapsize;
  76                void *map = map_sha1_file(sha1, &mapsize);
  77                if (map) {
  78                        char type[100];
  79                        unsigned long size;
  80                        void *buffer = NULL;
  81                        if (!check_sha1_signature(sha1, map, mapsize))
  82                                buffer = unpack_sha1_file(map, mapsize, type, &size);
  83                        munmap(map, mapsize);
  84                        if (buffer && !fsck_entry(sha1, type, buffer, size))
  85                                return 0;
  86                }
  87        }
  88        return -1;
  89}
  90
  91static int fsck_dir(int i, char *path)
  92{
  93        DIR *dir = opendir(path);
  94        struct dirent *de;
  95
  96        if (!dir) {
  97                fprintf(stderr, "missing sha1 directory '%s'", path);
  98                return -1;
  99        }
 100
 101        while ((de = readdir(dir)) != NULL) {
 102                char name[100];
 103                int len = strlen(de->d_name);
 104
 105                switch (len) {
 106                case 2:
 107                        if (de->d_name[1] != '.')
 108                                break;
 109                case 1:
 110                        if (de->d_name[0] != '.')
 111                                break;
 112                        continue;
 113                case 38:
 114                        sprintf(name, "%02x", i);
 115                        memcpy(name+2, de->d_name, len+1);
 116                        if (!fsck_name(name))
 117                                continue;
 118                }
 119                fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 120        }
 121        closedir(dir);
 122        return 0;
 123}
 124
 125int main(int argc, char **argv)
 126{
 127        int i;
 128        char *sha1_dir;
 129
 130        if (argc != 1)
 131                usage("fsck-cache");
 132        sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 133        for (i = 0; i < 256; i++) {
 134                static char dir[4096];
 135                sprintf(dir, "%s/%02x", sha1_dir, i);
 136                fsck_dir(i, dir);
 137        }
 138        return 0;
 139}