fsck-cache.c

   1 #include "cache.h"
   2
   3 #include <sys/types.h>
   4 #include <dirent.h>
   5
   6 #include "commit.h"
   7 #include "tree.h"
   8 #include "blob.h"
   9
  10 #define REACHABLE 0x0001
  11
  12 static int show_tags = 0;
  13 static int show_unreachable = 0;
  14 static unsigned char head_sha1[20];
  15
  16 static void check_connectivity(void)
  17 {
  18         int i;
  19
  20         /* Look up all the requirements, warn about missing objects.. */
  21         for (i = 0; i < nr_objs; i++) {
  22                 struct object *obj = objs[i];
  23
  24                 if (show_unreachable && !(obj->flags & REACHABLE)) {
  25                         printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  26                         continue;
  27                 }
  28
  29                 if (!obj->parsed) {
  30                         printf("missing %s %s\n", obj->type,
  31                                sha1_to_hex(obj->sha1));
  32                 }
  33                 if (!obj->used) {
  34                         printf("dangling %s %s\n", obj->type,
  35                                sha1_to_hex(obj->sha1));
  36                 }
  37         }
  38 }
  39
  40 static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
  41 {
  42         struct tree *item = lookup_tree(sha1);
  43         if (parse_tree(item))
  44                 return -1;
  45         if (item->has_full_path) {
  46                 fprintf(stderr, "warning: fsck-cache: tree %s "
  47                         "has full pathnames in it\n", sha1_to_hex(sha1));
  48         }
  49         return 0;
  50 }
  51
  52 static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
  53 {
  54         struct commit *commit = lookup_commit(sha1);
  55         if (parse_commit(commit))
  56                 return -1;
  57         if (!commit->tree)
  58                 return -1;
  59         if (!commit->parents)
  60                 printf("root %s\n", sha1_to_hex(sha1));
  61         if (!commit->date)
  62                 printf("bad commit date in %s\n", sha1_to_hex(sha1));
  63         return 0;
  64 }
  65
  66 static int fsck_blob(unsigned char *sha1, void *data, unsigned long size)
  67 {
  68         struct blob *blob = lookup_blob(sha1);
  69         blob->object.parsed = 1;
  70         return 0;
  71 }
  72
  73 static int fsck_tag(unsigned char *sha1, void *data, unsigned long size)
  74 {
  75         int typelen, taglen;
  76         unsigned char object[20];
  77         char object_hex[60];
  78         const char *type_line, *tag_line, *sig_line;
  79
  80         if (size < 64)
  81                 return -1;
  82         if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
  83                 return -1;
  84
  85         type_line = data + 48;
  86         if (memcmp("\ntype ", type_line-1, 6))
  87                 return -1;
  88
  89         tag_line = strchr(type_line, '\n');
  90         if (!tag_line || memcmp("tag ", ++tag_line, 4))
  91                 return -1;
  92
  93         sig_line = strchr(tag_line, '\n');
  94         if (!sig_line)
  95                 return -1;
  96         sig_line++;
  97
  98         typelen = tag_line - type_line - strlen("type \n");
  99         if (typelen >= 20)
 100                 return -1;
 101         taglen = sig_line - tag_line - strlen("tag \n");
 102
 103         if (!show_tags)
 104                 return 0;
 105
 106         strcpy(object_hex, sha1_to_hex(object));
 107         printf("tagged %.*s %s (%.*s) in %s\n",
 108                 typelen, type_line + 5,
 109                 object_hex,
 110                 taglen, tag_line + 4,
 111                 sha1_to_hex(sha1));
 112         return 0;
 113 }
 114
 115 static int fsck_entry(unsigned char *sha1, char *tag, void *data,
 116                       unsigned long size)
 117 {
 118         if (!strcmp(tag, "blob")) {
 119                 if (fsck_blob(sha1, data, size) < 0)
 120                         return -1;
 121         } else if (!strcmp(tag, "tree")) {
 122                 if (fsck_tree(sha1, data, size) < 0)
 123                         return -1;
 124         } else if (!strcmp(tag, "commit")) {
 125                 if (fsck_commit(sha1, data, size) < 0)
 126                         return -1;
 127         } else if (!strcmp(tag, "tag")) {
 128                 if (fsck_tag(sha1, data, size) < 0)
 129                         return -1;
 130         } else
 131                 return -1;
 132         return 0;
 133 }
 134
 135 static int fsck_name(char *hex)
 136 {
 137         unsigned char sha1[20];
 138         if (!get_sha1_hex(hex, sha1)) {
 139                 unsigned long mapsize;
 140                 void *map = map_sha1_file(sha1, &mapsize);
 141                 if (map) {
 142                         char type[100];
 143                         unsigned long size;
 144                         void *buffer = unpack_sha1_file(map, mapsize, type, &size);
 145                         if (!buffer)
 146                                 return -1;
 147                         if (check_sha1_signature(sha1, buffer, size, type) < 0)
 148                                 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
 149                         munmap(map, mapsize);
 150                         if (!fsck_entry(sha1, type, buffer, size))
 151                                 return 0;
 152                 }
 153         }
 154         return -1;
 155 }
 156
 157 static int fsck_dir(int i, char *path)
 158 {
 159         DIR *dir = opendir(path);
 160         struct dirent *de;
 161
 162         if (!dir) {
 163                 return error("missing sha1 directory '%s'", path);
 164         }
 165
 166         while ((de = readdir(dir)) != NULL) {
 167                 char name[100];
 168                 int len = strlen(de->d_name);
 169
 170                 switch (len) {
 171                 case 2:
 172                         if (de->d_name[1] != '.')
 173                                 break;
 174                 case 1:
 175                         if (de->d_name[0] != '.')
 176                                 break;
 177                         continue;
 178                 case 38:
 179                         sprintf(name, "%02x", i);
 180                         memcpy(name+2, de->d_name, len+1);
 181                         if (!fsck_name(name))
 182                                 continue;
 183                 }
 184                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 185         }
 186         closedir(dir);
 187         return 0;
 188 }
 189
 190 int main(int argc, char **argv)
 191 {
 192         int i, heads;
 193         char *sha1_dir;
 194
 195         for (i = 1; i < argc; i++) {
 196                 const char *arg = argv[i];
 197
 198                 if (!strcmp(arg, "--unreachable")) {
 199                         show_unreachable = 1;
 200                         continue;
 201                 }
 202                 if (!strcmp(arg, "--tags")) {
 203                         show_tags = 1;
 204                         continue;
 205                 }
 206                 if (*arg == '-')
 207                         usage("fsck-cache [--tags] [[--unreachable] <head-sha1>*]");
 208         }
 209
 210         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 211         for (i = 0; i < 256; i++) {
 212                 static char dir[4096];
 213                 sprintf(dir, "%s/%02x", sha1_dir, i);
 214                 fsck_dir(i, dir);
 215         }
 216
 217         heads = 0;
 218         for (i = 1; i < argc; i++) {
 219                 const char *arg = argv[i];
 220
 221                 if (*arg == '-')
 222                         continue;
 223
 224                 if (!get_sha1_hex(arg, head_sha1)) {
 225                         struct object *obj = &lookup_commit(head_sha1)->object;
 226                         obj->used = 1;
 227                         mark_reachable(obj, REACHABLE);
 228                         heads++;
 229                         continue;
 230                 }
 231                 error("expected sha1, got %s", arg);
 232         }
 233
 234         if (!heads) {
 235                 if (show_unreachable) {
 236                         fprintf(stderr, "unable to do reachability without a head\n");
 237                         show_unreachable = 0;
 238                 }
 239                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 240         }
 241
 242         check_connectivity();
 243         return 0;
 244 }