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