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_entry(unsigned char *sha1, char *tag, void *data,
  73                       unsigned long size)
  74 {
  75         if (!strcmp(tag, "blob")) {
  76                 if (fsck_blob(sha1, data, size) < 0)
  77                         return -1;
  78         } else if (!strcmp(tag, "tree")) {
  79                 if (fsck_tree(sha1, data, size) < 0)
  80                         return -1;
  81         } else if (!strcmp(tag, "commit")) {
  82                 if (fsck_commit(sha1, data, size) < 0)
  83                         return -1;
  84         } else
  85                 return -1;
  86         return 0;
  87 }
  88
  89 static int fsck_name(char *hex)
  90 {
  91         unsigned char sha1[20];
  92         if (!get_sha1_hex(hex, sha1)) {
  93                 unsigned long mapsize;
  94                 void *map = map_sha1_file(sha1, &mapsize);
  95                 if (map) {
  96                         char type[100];
  97                         unsigned long size;
  98                         void *buffer = unpack_sha1_file(map, mapsize, type, &size);
  99                         if (!buffer)
 100                                 return -1;
 101                         if (check_sha1_signature(sha1, buffer, size, type) < 0)
 102                                 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
 103                         munmap(map, mapsize);
 104                         if (!fsck_entry(sha1, type, buffer, size))
 105                                 return 0;
 106                 }
 107         }
 108         return -1;
 109 }
 110
 111 static int fsck_dir(int i, char *path)
 112 {
 113         DIR *dir = opendir(path);
 114         struct dirent *de;
 115
 116         if (!dir) {
 117                 return error("missing sha1 directory '%s'", path);
 118         }
 119
 120         while ((de = readdir(dir)) != NULL) {
 121                 char name[100];
 122                 int len = strlen(de->d_name);
 123
 124                 switch (len) {
 125                 case 2:
 126                         if (de->d_name[1] != '.')
 127                                 break;
 128                 case 1:
 129                         if (de->d_name[0] != '.')
 130                                 break;
 131                         continue;
 132                 case 38:
 133                         sprintf(name, "%02x", i);
 134                         memcpy(name+2, de->d_name, len+1);
 135                         if (!fsck_name(name))
 136                                 continue;
 137                 }
 138                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 139         }
 140         closedir(dir);
 141         return 0;
 142 }
 143
 144 int main(int argc, char **argv)
 145 {
 146         int i, heads;
 147         char *sha1_dir;
 148
 149         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 150         for (i = 0; i < 256; i++) {
 151                 static char dir[4096];
 152                 sprintf(dir, "%s/%02x", sha1_dir, i);
 153                 fsck_dir(i, dir);
 154         }
 155
 156         heads = 0;
 157         for (i = 1; i < argc; i++) {
 158                 if (!strcmp(argv[i], "--unreachable")) {
 159                         show_unreachable = 1;
 160                         continue;
 161                 }
 162                 if (!get_sha1_hex(argv[i], head_sha1)) {
 163                         struct object *obj = &lookup_commit(head_sha1)->object;
 164                         obj->used = 1;
 165                         mark_reachable(obj, REACHABLE);
 166                         heads++;
 167                         continue;
 168                 }
 169                 error("fsck-cache [[--unreachable] <head-sha1>*]");
 170         }
 171
 172         if (!heads) {
 173                 if (show_unreachable) {
 174                         fprintf(stderr, "unable to do reachability without a head\n");
 175                         show_unreachable = 0;
 176                 }
 177                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 178         }
 179
 180         check_connectivity();
 181         return 0;
 182 }