fsck-cache.c

   1 #include "cache.h"
   2
   3 #include <sys/types.h>
   4 #include <dirent.h>
   5
   6 #include "revision.h"
   7
   8 static int show_unreachable = 0;
   9 static unsigned char head_sha1[20];
  10
  11 static void check_connectivity(void)
  12 {
  13         int i;
  14
  15         /* Look up all the requirements, warn about missing objects.. */
  16         for (i = 0; i < nr_revs; i++) {
  17                 struct revision *rev = revs[i];
  18
  19                 if (show_unreachable && !(rev->flags & REACHABLE)) {
  20                         printf("unreachable %s\n", sha1_to_hex(rev->sha1));
  21                         continue;
  22                 }
  23
  24                 switch (rev->flags & (SEEN | USED)) {
  25                 case 0:
  26                         printf("bad %s\n", sha1_to_hex(rev->sha1));
  27                         break;
  28                 case USED:
  29                         printf("missing %s\n", sha1_to_hex(rev->sha1));
  30                         break;
  31                 case SEEN:
  32                         printf("dangling %s\n", sha1_to_hex(rev->sha1));
  33                         break;
  34                 }
  35         }
  36 }
  37
  38 static void mark_needs_sha1(unsigned char *parent, const char * tag, unsigned char *child)
  39 {
  40         struct revision * child_rev = add_relationship(lookup_rev(parent), child);
  41         child_rev->flags |= USED;
  42 }
  43
  44 static int mark_sha1_seen(unsigned char *sha1, char *tag)
  45 {
  46         struct revision *rev = lookup_rev(sha1);
  47
  48         rev->flags |= SEEN;
  49         return 0;
  50 }
  51
  52 static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
  53 {
  54         int warn_old_tree = 1;
  55
  56         while (size) {
  57                 int len = 1+strlen(data);
  58                 unsigned char *file_sha1 = data + len;
  59                 char *path = strchr(data, ' ');
  60                 unsigned int mode;
  61                 if (size < len + 20 || !path || sscanf(data, "%o", &mode) != 1)
  62                         return -1;
  63
  64                 /* Warn about trees that don't do the recursive thing.. */
  65                 if (warn_old_tree && strchr(path, '/')) {
  66                         fprintf(stderr, "warning: fsck-cache: tree %s has full pathnames in it\n", sha1_to_hex(sha1));
  67                         warn_old_tree = 0;
  68                 }
  69
  70                 data += len + 20;
  71                 size -= len + 20;
  72                 mark_needs_sha1(sha1, S_ISDIR(mode) ? "tree" : "blob", file_sha1);
  73         }
  74         return 0;
  75 }
  76
  77 static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
  78 {
  79         int parents;
  80         unsigned char tree_sha1[20];
  81         unsigned char parent_sha1[20];
  82
  83         if (memcmp(data, "tree ", 5))
  84                 return -1;
  85         if (get_sha1_hex(data + 5, tree_sha1) < 0)
  86                 return -1;
  87         mark_needs_sha1(sha1, "tree", tree_sha1);
  88         data += 5 + 40 + 1;     /* "tree " + <hex sha1> + '\n' */
  89         parents = 0;
  90         while (!memcmp(data, "parent ", 7)) {
  91                 if (get_sha1_hex(data + 7, parent_sha1) < 0)
  92                         return -1;
  93                 mark_needs_sha1(sha1, "commit", parent_sha1);
  94                 data += 7 + 40 + 1;     /* "parent " + <hex sha1> + '\n' */
  95                 parents++;
  96         }
  97         if (!parents)
  98                 printf("root %s\n", sha1_to_hex(sha1));
  99         return 0;
 100 }
 101
 102 static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
 103 {
 104         if (!strcmp(tag, "blob")) {
 105                 /* Nothing to check */;
 106         } else if (!strcmp(tag, "tree")) {
 107                 if (fsck_tree(sha1, data, size) < 0)
 108                         return -1;
 109         } else if (!strcmp(tag, "commit")) {
 110                 if (fsck_commit(sha1, data, size) < 0)
 111                         return -1;
 112         } else
 113                 return -1;
 114         return mark_sha1_seen(sha1, tag);
 115 }
 116
 117 static int fsck_name(char *hex)
 118 {
 119         unsigned char sha1[20];
 120         if (!get_sha1_hex(hex, sha1)) {
 121                 unsigned long mapsize;
 122                 void *map = map_sha1_file(sha1, &mapsize);
 123                 if (map) {
 124                         char type[100];
 125                         unsigned long size;
 126                         void *buffer = NULL;
 127                         if (!check_sha1_signature(sha1, map, mapsize))
 128                                 buffer = unpack_sha1_file(map, mapsize, type, &size);
 129                         munmap(map, mapsize);
 130                         if (buffer && !fsck_entry(sha1, type, buffer, size))
 131                                 return 0;
 132                 }
 133         }
 134         return -1;
 135 }
 136
 137 static int fsck_dir(int i, char *path)
 138 {
 139         DIR *dir = opendir(path);
 140         struct dirent *de;
 141
 142         if (!dir) {
 143                 return error("missing sha1 directory '%s'", path);
 144         }
 145
 146         while ((de = readdir(dir)) != NULL) {
 147                 char name[100];
 148                 int len = strlen(de->d_name);
 149
 150                 switch (len) {
 151                 case 2:
 152                         if (de->d_name[1] != '.')
 153                                 break;
 154                 case 1:
 155                         if (de->d_name[0] != '.')
 156                                 break;
 157                         continue;
 158                 case 38:
 159                         sprintf(name, "%02x", i);
 160                         memcpy(name+2, de->d_name, len+1);
 161                         if (!fsck_name(name))
 162                                 continue;
 163                 }
 164                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 165         }
 166         closedir(dir);
 167         return 0;
 168 }
 169
 170 int main(int argc, char **argv)
 171 {
 172         int i, heads;
 173         char *sha1_dir;
 174
 175         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 176         for (i = 0; i < 256; i++) {
 177                 static char dir[4096];
 178                 sprintf(dir, "%s/%02x", sha1_dir, i);
 179                 fsck_dir(i, dir);
 180         }
 181
 182         heads = 0;
 183         for (i = 1; i < argc; i++) {
 184                 if (!strcmp(argv[i], "--unreachable")) {
 185                         show_unreachable = 1;
 186                         continue;
 187                 }
 188                 if (!get_sha1_hex(argv[i], head_sha1)) {
 189                         mark_reachable(lookup_rev(head_sha1));
 190                         heads++;
 191                         continue;
 192                 }
 193                 error("fsck-cache [[--unreachable] <head-sha1>*]");
 194         }
 195
 196         if (!heads) {
 197                 if (show_unreachable) {
 198                         fprintf(stderr, "unable to do reachability without a head\n");
 199                         show_unreachable = 0;
 200                 }
 201                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 202         }
 203
 204         check_connectivity();
 205         return 0;
 206 }