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\n", 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         return 0;
  61 }
  62
  63 static int fsck_entry(unsigned char *sha1, char *tag, void *data,
  64                       unsigned long size)
  65 {
  66         if (!strcmp(tag, "blob")) {
  67                 lookup_blob(sha1); /* Nothing to check; but notice it. */
  68         } else if (!strcmp(tag, "tree")) {
  69                 if (fsck_tree(sha1, data, size) < 0)
  70                         return -1;
  71         } else if (!strcmp(tag, "commit")) {
  72                 if (fsck_commit(sha1, data, size) < 0)
  73                         return -1;
  74         } else
  75                 return -1;
  76         return 0;
  77 }
  78
  79 static int fsck_name(char *hex)
  80 {
  81         unsigned char sha1[20];
  82         if (!get_sha1_hex(hex, sha1)) {
  83                 unsigned long mapsize;
  84                 void *map = map_sha1_file(sha1, &mapsize);
  85                 if (map) {
  86                         char type[100];
  87                         unsigned long size;
  88                         void *buffer = NULL;
  89                         if (!check_sha1_signature(sha1, map, mapsize))
  90                                 buffer = unpack_sha1_file(map, mapsize, type,
  91                                                           &size);
  92                         munmap(map, mapsize);
  93                         if (buffer && !fsck_entry(sha1, type, buffer, size))
  94                                 return 0;
  95                 }
  96         }
  97         return -1;
  98 }
  99
 100 static int fsck_dir(int i, char *path)
 101 {
 102         DIR *dir = opendir(path);
 103         struct dirent *de;
 104
 105         if (!dir) {
 106                 return error("missing sha1 directory '%s'", path);
 107         }
 108
 109         while ((de = readdir(dir)) != NULL) {
 110                 char name[100];
 111                 int len = strlen(de->d_name);
 112
 113                 switch (len) {
 114                 case 2:
 115                         if (de->d_name[1] != '.')
 116                                 break;
 117                 case 1:
 118                         if (de->d_name[0] != '.')
 119                                 break;
 120                         continue;
 121                 case 38:
 122                         sprintf(name, "%02x", i);
 123                         memcpy(name+2, de->d_name, len+1);
 124                         if (!fsck_name(name))
 125                                 continue;
 126                 }
 127                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 128         }
 129         closedir(dir);
 130         return 0;
 131 }
 132
 133 int main(int argc, char **argv)
 134 {
 135         int i, heads;
 136         char *sha1_dir;
 137
 138         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 139         for (i = 0; i < 256; i++) {
 140                 static char dir[4096];
 141                 sprintf(dir, "%s/%02x", sha1_dir, i);
 142                 fsck_dir(i, dir);
 143         }
 144
 145         heads = 0;
 146         for (i = 1; i < argc; i++) {
 147                 if (!strcmp(argv[i], "--unreachable")) {
 148                         show_unreachable = 1;
 149                         continue;
 150                 }
 151                 if (!get_sha1_hex(argv[i], head_sha1)) {
 152                         struct object *obj =
 153                                 &lookup_commit(head_sha1)->object;
 154                         obj->used = 1;
 155                         mark_reachable(obj, REACHABLE);
 156                         heads++;
 157                         continue;
 158                 }
 159                 error("fsck-cache [[--unreachable] <head-sha1>*]");
 160         }
 161
 162         if (!heads) {
 163                 if (show_unreachable) {
 164                         fprintf(stderr, "unable to do reachability without a head\n");
 165                         show_unreachable = 0;
 166                 }
 167                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 168         }
 169
 170         check_connectivity();
 171         return 0;
 172 }