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 #include "tag.h"
  10
  11 #define REACHABLE 0x0001
  12
  13 static int show_root = 0;
  14 static int show_tags = 0;
  15 static int show_unreachable = 0;
  16 static unsigned char head_sha1[20];
  17
  18 static void check_connectivity(void)
  19 {
  20         int i;
  21
  22         /* Look up all the requirements, warn about missing objects.. */
  23         for (i = 0; i < nr_objs; i++) {
  24                 struct object *obj = objs[i];
  25                 struct object_list *refs;
  26
  27                 if (show_unreachable && !(obj->flags & REACHABLE)) {
  28                         printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  29                         continue;
  30                 }
  31
  32                 if (!obj->parsed) {
  33                         printf("missing %s %s\n", obj->type,
  34                                sha1_to_hex(obj->sha1));
  35                 }
  36                 if (!obj->used) {
  37                         printf("dangling %s %s\n", obj->type,
  38                                sha1_to_hex(obj->sha1));
  39                 }
  40                 for (refs = obj->refs; refs; refs = refs->next) {
  41                         if (!refs->item->parsed) {
  42                                 printf("broken link from %s\n",
  43                                        sha1_to_hex(obj->sha1));
  44                                 printf("              to %s\n",
  45                                        sha1_to_hex(refs->item->sha1));
  46                         }
  47                 }
  48         }
  49 }
  50
  51 static int fsck_tree(struct tree *item)
  52 {
  53         if (item->has_full_path) {
  54                 fprintf(stderr, "warning: fsck-cache: tree %s "
  55                         "has full pathnames in it\n",
  56                         sha1_to_hex(item->object.sha1));
  57         }
  58         return 0;
  59 }
  60
  61 static int fsck_commit(struct commit *commit)
  62 {
  63         if (!commit->tree)
  64                 return -1;
  65         if (!commit->parents && show_root)
  66                 printf("root %s\n", sha1_to_hex(commit->object.sha1));
  67         if (!commit->date)
  68                 printf("bad commit date in %s\n",
  69                        sha1_to_hex(commit->object.sha1));
  70         return 0;
  71 }
  72
  73 static int fsck_tag(struct tag *tag)
  74 {
  75         if (!show_tags)
  76                 return 0;
  77
  78         printf("tagged %s %s",
  79                tag->tagged->type,
  80                sha1_to_hex(tag->tagged->sha1));
  81         printf(" (%s) in %s\n",
  82                tag->tag, sha1_to_hex(tag->object.sha1));
  83         return 0;
  84 }
  85
  86 static int fsck_name(char *hex)
  87 {
  88         unsigned char sha1[20];
  89         if (!get_sha1_hex(hex, sha1)) {
  90                 struct object *obj = parse_object(sha1);
  91                 if (!obj)
  92                         return -1;
  93                 if (obj->type == blob_type)
  94                         return 0;
  95                 if (obj->type == tree_type)
  96                         return fsck_tree((struct tree *) obj);
  97                 if (obj->type == commit_type)
  98                         return fsck_commit((struct commit *) obj);
  99                 if (obj->type == tag_type)
 100                         return fsck_tag((struct tag *) obj);
 101         }
 102         return -1;
 103 }
 104
 105 static int fsck_dir(int i, char *path)
 106 {
 107         DIR *dir = opendir(path);
 108         struct dirent *de;
 109
 110         if (!dir) {
 111                 return error("missing sha1 directory '%s'", path);
 112         }
 113
 114         while ((de = readdir(dir)) != NULL) {
 115                 char name[100];
 116                 int len = strlen(de->d_name);
 117
 118                 switch (len) {
 119                 case 2:
 120                         if (de->d_name[1] != '.')
 121                                 break;
 122                 case 1:
 123                         if (de->d_name[0] != '.')
 124                                 break;
 125                         continue;
 126                 case 38:
 127                         sprintf(name, "%02x", i);
 128                         memcpy(name+2, de->d_name, len+1);
 129                         if (!fsck_name(name))
 130                                 continue;
 131                 }
 132                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 133         }
 134         closedir(dir);
 135         return 0;
 136 }
 137
 138 int main(int argc, char **argv)
 139 {
 140         int i, heads;
 141         char *sha1_dir;
 142
 143         for (i = 1; i < argc; i++) {
 144                 const char *arg = argv[i];
 145
 146                 if (!strcmp(arg, "--unreachable")) {
 147                         show_unreachable = 1;
 148                         continue;
 149                 }
 150                 if (!strcmp(arg, "--tags")) {
 151                         show_tags = 1;
 152                         continue;
 153                 }
 154                 if (!strcmp(arg, "--root")) {
 155                         show_root = 1;
 156                         continue;
 157                 }
 158                 if (*arg == '-')
 159                         usage("fsck-cache [--tags] [[--unreachable] <head-sha1>*]");
 160         }
 161
 162         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 163         for (i = 0; i < 256; i++) {
 164                 static char dir[4096];
 165                 sprintf(dir, "%s/%02x", sha1_dir, i);
 166                 fsck_dir(i, dir);
 167         }
 168
 169         heads = 0;
 170         for (i = 1; i < argc; i++) {
 171                 const char *arg = argv[i];
 172
 173                 if (*arg == '-')
 174                         continue;
 175
 176                 if (!get_sha1_hex(arg, head_sha1)) {
 177                         struct commit *commit = lookup_commit(head_sha1);
 178                         struct object *obj;
 179
 180                         /* Error is printed by lookup_commit(). */
 181                         if (!commit)
 182                                 continue;
 183
 184                         obj = &commit->object;
 185                         obj->used = 1;
 186                         mark_reachable(obj, REACHABLE);
 187                         heads++;
 188                         continue;
 189                 }
 190                 error("expected sha1, got %s", arg);
 191         }
 192
 193         if (!heads) {
 194                 if (show_unreachable) {
 195                         fprintf(stderr, "unable to do reachability without a head\n");
 196                         show_unreachable = 0;
 197                 }
 198                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 199         }
 200
 201         check_connectivity();
 202         return 0;
 203 }