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_root = 0;
  13 static int show_tags = 0;
  14 static int show_unreachable = 0;
  15 static unsigned char head_sha1[20];
  16
  17 static void check_connectivity(void)
  18 {
  19         int i;
  20
  21         /* Look up all the requirements, warn about missing objects.. */
  22         for (i = 0; i < nr_objs; i++) {
  23                 struct object *obj = objs[i];
  24
  25                 if (show_unreachable && !(obj->flags & REACHABLE)) {
  26                         printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  27                         continue;
  28                 }
  29
  30                 if (!obj->parsed) {
  31                         printf("missing %s %s\n", obj->type,
  32                                sha1_to_hex(obj->sha1));
  33                 }
  34                 if (!obj->used) {
  35                         printf("dangling %s %s\n", obj->type,
  36                                sha1_to_hex(obj->sha1));
  37                 }
  38         }
  39 }
  40
  41 static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
  42 {
  43         struct tree *item = lookup_tree(sha1);
  44         if (parse_tree(item))
  45                 return -1;
  46         if (item->has_full_path) {
  47                 fprintf(stderr, "warning: fsck-cache: tree %s "
  48                         "has full pathnames in it\n", sha1_to_hex(sha1));
  49         }
  50         return 0;
  51 }
  52
  53 static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
  54 {
  55         struct commit *commit = lookup_commit(sha1);
  56         if (parse_commit(commit))
  57                 return -1;
  58         if (!commit->tree)
  59                 return -1;
  60         if (!commit->parents && show_root)
  61                 printf("root %s\n", sha1_to_hex(sha1));
  62         if (!commit->date)
  63                 printf("bad commit date in %s\n", sha1_to_hex(sha1));
  64         return 0;
  65 }
  66
  67 static int fsck_blob(unsigned char *sha1, void *data, unsigned long size)
  68 {
  69         struct blob *blob = lookup_blob(sha1);
  70         blob->object.parsed = 1;
  71         return 0;
  72 }
  73
  74 static int fsck_tag(unsigned char *sha1, void *data, unsigned long size)
  75 {
  76         int typelen, taglen;
  77         unsigned char object[20];
  78         char object_hex[60];
  79         const char *type_line, *tag_line, *sig_line;
  80
  81         if (size < 64)
  82                 return -1;
  83         if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
  84                 return -1;
  85
  86         type_line = data + 48;
  87         if (memcmp("\ntype ", type_line-1, 6))
  88                 return -1;
  89
  90         tag_line = strchr(type_line, '\n');
  91         if (!tag_line || memcmp("tag ", ++tag_line, 4))
  92                 return -1;
  93
  94         sig_line = strchr(tag_line, '\n');
  95         if (!sig_line)
  96                 return -1;
  97         sig_line++;
  98
  99         typelen = tag_line - type_line - strlen("type \n");
 100         if (typelen >= 20)
 101                 return -1;
 102         taglen = sig_line - tag_line - strlen("tag \n");
 103
 104         if (!show_tags)
 105                 return 0;
 106
 107         strcpy(object_hex, sha1_to_hex(object));
 108         printf("tagged %.*s %s (%.*s) in %s\n",
 109                 typelen, type_line + 5,
 110                 object_hex,
 111                 taglen, tag_line + 4,
 112                 sha1_to_hex(sha1));
 113         return 0;
 114 }
 115
 116 static int fsck_entry(unsigned char *sha1, char *tag, void *data,
 117                       unsigned long size)
 118 {
 119         if (!strcmp(tag, "blob")) {
 120                 if (fsck_blob(sha1, data, size) < 0)
 121                         return -1;
 122         } else if (!strcmp(tag, "tree")) {
 123                 if (fsck_tree(sha1, data, size) < 0)
 124                         return -1;
 125         } else if (!strcmp(tag, "commit")) {
 126                 if (fsck_commit(sha1, data, size) < 0)
 127                         return -1;
 128         } else if (!strcmp(tag, "tag")) {
 129                 if (fsck_tag(sha1, data, size) < 0)
 130                         return -1;
 131         } else
 132                 return -1;
 133         return 0;
 134 }
 135
 136 static int fsck_name(char *hex)
 137 {
 138         unsigned char sha1[20];
 139         if (!get_sha1_hex(hex, sha1)) {
 140                 unsigned long mapsize;
 141                 void *map = map_sha1_file(sha1, &mapsize);
 142                 if (map) {
 143                         char type[100];
 144                         unsigned long size;
 145                         void *buffer = unpack_sha1_file(map, mapsize, type, &size);
 146                         if (!buffer)
 147                                 return -1;
 148                         if (check_sha1_signature(sha1, buffer, size, type) < 0)
 149                                 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
 150                         munmap(map, mapsize);
 151                         if (!fsck_entry(sha1, type, buffer, size))
 152                                 return 0;
 153                 }
 154         }
 155         return -1;
 156 }
 157
 158 static int fsck_dir(int i, char *path)
 159 {
 160         DIR *dir = opendir(path);
 161         struct dirent *de;
 162
 163         if (!dir) {
 164                 return error("missing sha1 directory '%s'", path);
 165         }
 166
 167         while ((de = readdir(dir)) != NULL) {
 168                 char name[100];
 169                 int len = strlen(de->d_name);
 170
 171                 switch (len) {
 172                 case 2:
 173                         if (de->d_name[1] != '.')
 174                                 break;
 175                 case 1:
 176                         if (de->d_name[0] != '.')
 177                                 break;
 178                         continue;
 179                 case 38:
 180                         sprintf(name, "%02x", i);
 181                         memcpy(name+2, de->d_name, len+1);
 182                         if (!fsck_name(name))
 183                                 continue;
 184                 }
 185                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 186         }
 187         closedir(dir);
 188         return 0;
 189 }
 190
 191 int main(int argc, char **argv)
 192 {
 193         int i, heads;
 194         char *sha1_dir;
 195
 196         for (i = 1; i < argc; i++) {
 197                 const char *arg = argv[i];
 198
 199                 if (!strcmp(arg, "--unreachable")) {
 200                         show_unreachable = 1;
 201                         continue;
 202                 }
 203                 if (!strcmp(arg, "--tags")) {
 204                         show_tags = 1;
 205                         continue;
 206                 }
 207                 if (!strcmp(arg, "--root")) {
 208                         show_root = 1;
 209                         continue;
 210                 }
 211                 if (*arg == '-')
 212                         usage("fsck-cache [--tags] [[--unreachable] <head-sha1>*]");
 213         }
 214
 215         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 216         for (i = 0; i < 256; i++) {
 217                 static char dir[4096];
 218                 sprintf(dir, "%s/%02x", sha1_dir, i);
 219                 fsck_dir(i, dir);
 220         }
 221
 222         heads = 0;
 223         for (i = 1; i < argc; i++) {
 224                 const char *arg = argv[i];
 225
 226                 if (*arg == '-')
 227                         continue;
 228
 229                 if (!get_sha1_hex(arg, head_sha1)) {
 230                         struct object *obj = &lookup_commit(head_sha1)->object;
 231                         obj->used = 1;
 232                         mark_reachable(obj, REACHABLE);
 233                         heads++;
 234                         continue;
 235                 }
 236                 error("expected sha1, got %s", arg);
 237         }
 238
 239         if (!heads) {
 240                 if (show_unreachable) {
 241                         fprintf(stderr, "unable to do reachability without a head\n");
 242                         show_unreachable = 0;
 243                 }
 244                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 245         }
 246
 247         check_connectivity();
 248         return 0;
 249 }