fsck-cache.c

   1 #include <sys/types.h>
   2 #include <dirent.h>
   3
   4 #include "cache.h"
   5 #include "commit.h"
   6 #include "tree.h"
   7 #include "blob.h"
   8 #include "tag.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                 struct object_list *refs;
  25
  26                 if (!obj->parsed) {
  27                         printf("missing %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  28                         continue;
  29                 }
  30
  31                 for (refs = obj->refs; refs; refs = refs->next) {
  32                         if (refs->item->parsed)
  33                                 continue;
  34                         printf("broken link from %7s %s\n",
  35                                obj->type, sha1_to_hex(obj->sha1));
  36                         printf("              to %7s %s\n",
  37                                obj->type, sha1_to_hex(refs->item->sha1));
  38                 }
  39
  40                 /* Don't bother with tag reachability. */
  41                 if (obj->type == tag_type)
  42                         continue;
  43
  44                 if (show_unreachable && !(obj->flags & REACHABLE)) {
  45                         printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  46                         continue;
  47                 }
  48
  49                 if (!obj->used) {
  50                         printf("dangling %s %s\n", obj->type,
  51                                sha1_to_hex(obj->sha1));
  52                 }
  53         }
  54 }
  55
  56 static int fsck_tree(struct tree *item)
  57 {
  58         if (item->has_full_path) {
  59                 fprintf(stderr, "warning: fsck-cache: tree %s "
  60                         "has full pathnames in it\n",
  61                         sha1_to_hex(item->object.sha1));
  62         }
  63         return 0;
  64 }
  65
  66 static int fsck_commit(struct commit *commit)
  67 {
  68         if (!commit->tree)
  69                 return -1;
  70         if (!commit->parents && show_root)
  71                 printf("root %s\n", sha1_to_hex(commit->object.sha1));
  72         if (!commit->date)
  73                 printf("bad commit date in %s\n",
  74                        sha1_to_hex(commit->object.sha1));
  75         return 0;
  76 }
  77
  78 static int fsck_tag(struct tag *tag)
  79 {
  80         if (!show_tags)
  81                 return 0;
  82
  83         printf("tagged %s %s",
  84                tag->tagged->type,
  85                sha1_to_hex(tag->tagged->sha1));
  86         printf(" (%s) in %s\n",
  87                tag->tag, sha1_to_hex(tag->object.sha1));
  88         return 0;
  89 }
  90
  91 static int fsck_sha1(unsigned char *sha1)
  92 {
  93         struct object *obj = parse_object(sha1);
  94         if (!obj)
  95                 return -1;
  96         if (obj->type == blob_type)
  97                 return 0;
  98         if (obj->type == tree_type)
  99                 return fsck_tree((struct tree *) obj);
 100         if (obj->type == commit_type)
 101                 return fsck_commit((struct commit *) obj);
 102         if (obj->type == tag_type)
 103                 return fsck_tag((struct tag *) obj);
 104         return -1;
 105 }
 106
 107 /*
 108  * This is the sorting chunk size: make it reasonably
 109  * big so that we can sort well..
 110  */
 111 #define MAX_SHA1_ENTRIES (1024)
 112
 113 struct sha1_entry {
 114         unsigned long ino;
 115         unsigned char sha1[20];
 116 };
 117
 118 static struct {
 119         unsigned long nr;
 120         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 121 } sha1_list;
 122
 123 static int ino_compare(const void *_a, const void *_b)
 124 {
 125         const struct sha1_entry *a = _a, *b = _b;
 126         unsigned long ino1 = a->ino, ino2 = b->ino;
 127         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 128 }
 129
 130 static void fsck_sha1_list(void)
 131 {
 132         int i, nr = sha1_list.nr;
 133
 134         qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
 135         for (i = 0; i < nr; i++) {
 136                 struct sha1_entry *entry = sha1_list.entry[i];
 137                 unsigned char *sha1 = entry->sha1;
 138
 139                 sha1_list.entry[i] = NULL;
 140                 if (fsck_sha1(sha1) < 0)
 141                         fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
 142                 free(entry);
 143         }
 144         sha1_list.nr = 0;
 145 }
 146
 147 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 148 {
 149         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 150         int nr;
 151
 152         entry->ino = ino;
 153         memcpy(entry->sha1, sha1, 20);
 154         nr = sha1_list.nr;
 155         if (nr == MAX_SHA1_ENTRIES) {
 156                 fsck_sha1_list();
 157                 nr = 0;
 158         }
 159         sha1_list.entry[nr] = entry;
 160         sha1_list.nr = ++nr;
 161 }
 162
 163 static int fsck_dir(int i, char *path)
 164 {
 165         DIR *dir = opendir(path);
 166         struct dirent *de;
 167
 168         if (!dir) {
 169                 return error("missing sha1 directory '%s'", path);
 170         }
 171
 172         while ((de = readdir(dir)) != NULL) {
 173                 char name[100];
 174                 unsigned char sha1[20];
 175                 int len = strlen(de->d_name);
 176
 177                 switch (len) {
 178                 case 2:
 179                         if (de->d_name[1] != '.')
 180                                 break;
 181                 case 1:
 182                         if (de->d_name[0] != '.')
 183                                 break;
 184                         continue;
 185                 case 38:
 186                         sprintf(name, "%02x", i);
 187                         memcpy(name+2, de->d_name, len+1);
 188                         if (get_sha1_hex(name, sha1) < 0)
 189                                 break;
 190                         add_sha1_list(sha1, de->d_ino);
 191                         continue;
 192                 }
 193                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 194         }
 195         closedir(dir);
 196         return 0;
 197 }
 198
 199 int main(int argc, char **argv)
 200 {
 201         int i, heads;
 202         char *sha1_dir;
 203
 204         for (i = 1; i < argc; i++) {
 205                 const char *arg = argv[i];
 206
 207                 if (!strcmp(arg, "--unreachable")) {
 208                         show_unreachable = 1;
 209                         continue;
 210                 }
 211                 if (!strcmp(arg, "--tags")) {
 212                         show_tags = 1;
 213                         continue;
 214                 }
 215                 if (!strcmp(arg, "--root")) {
 216                         show_root = 1;
 217                         continue;
 218                 }
 219                 if (*arg == '-')
 220                         usage("fsck-cache [--tags] [[--unreachable] <head-sha1>*]");
 221         }
 222
 223         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 224         for (i = 0; i < 256; i++) {
 225                 static char dir[4096];
 226                 sprintf(dir, "%s/%02x", sha1_dir, i);
 227                 fsck_dir(i, dir);
 228         }
 229         fsck_sha1_list();
 230
 231         heads = 0;
 232         for (i = 1; i < argc; i++) {
 233                 const char *arg = argv[i];
 234
 235                 if (*arg == '-')
 236                         continue;
 237
 238                 if (!get_sha1(arg, head_sha1)) {
 239                         struct commit *commit = lookup_commit(head_sha1);
 240                         struct object *obj;
 241
 242                         /* Error is printed by lookup_commit(). */
 243                         if (!commit)
 244                                 continue;
 245
 246                         obj = &commit->object;
 247                         obj->used = 1;
 248                         mark_reachable(obj, REACHABLE);
 249                         heads++;
 250                         continue;
 251                 }
 252                 error("expected sha1, got %s", arg);
 253         }
 254
 255         if (!heads) {
 256                 if (show_unreachable) {
 257                         fprintf(stderr, "unable to do reachability without a head\n");
 258                         show_unreachable = 0;
 259                 }
 260                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 261         }
 262
 263         check_connectivity();
 264         return 0;
 265 }