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 int keep_cache_objects = 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 (!obj->parsed) {
  28                         printf("missing %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  29                         continue;
  30                 }
  31
  32                 for (refs = obj->refs; refs; refs = refs->next) {
  33                         if (refs->item->parsed)
  34                                 continue;
  35                         printf("broken link from %7s %s\n",
  36                                obj->type, sha1_to_hex(obj->sha1));
  37                         printf("              to %7s %s\n",
  38                                refs->item->type, sha1_to_hex(refs->item->sha1));
  39                 }
  40
  41                 /* Don't bother with tag reachability. */
  42                 if (obj->type == tag_type)
  43                         continue;
  44
  45                 if (show_unreachable && !(obj->flags & REACHABLE)) {
  46                         printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  47                         continue;
  48                 }
  49
  50                 if (!obj->used) {
  51                         printf("dangling %s %s\n", obj->type,
  52                                sha1_to_hex(obj->sha1));
  53                 }
  54         }
  55 }
  56
  57 /*
  58  * The entries in a tree are ordered in the _path_ order,
  59  * which means that a directory entry is ordered by adding
  60  * a slash to the end of it.
  61  *
  62  * So a directory called "a" is ordered _after_ a file
  63  * called "a.c", because "a/" sorts after "a.c".
  64  */
  65 static int verify_ordered(struct tree_entry_list *a, struct tree_entry_list *b)
  66 {
  67         int len1 = strlen(a->name);
  68         int len2 = strlen(b->name);
  69         int len = len1 < len2 ? len1 : len2;
  70         unsigned char c1, c2;
  71         int cmp;
  72
  73         cmp = memcmp(a->name, b->name, len);
  74         if (cmp < 0)
  75                 return 0;
  76         if (cmp > 0)
  77                 return -1;
  78
  79         /*
  80          * Ok, the first <len> characters are the same.
  81          * Now we need to order the next one, but turn
  82          * a '\0' into a '/' for a directory entry.
  83          */
  84         c1 = a->name[len];
  85         c2 = b->name[len];
  86         if (!c1 && a->directory)
  87                 c1 = '/';
  88         if (!c2 && b->directory)
  89                 c2 = '/';
  90         return c1 < c2 ? 0 : -1;
  91 }
  92
  93 static int fsck_tree(struct tree *item)
  94 {
  95         int has_full_path = 0;
  96         struct tree_entry_list *entry, *last;
  97
  98         last = NULL;
  99         for (entry = item->entries; entry; entry = entry->next) {
 100                 if (strchr(entry->name, '/'))
 101                         has_full_path = 1;
 102
 103                 if (last) {
 104                         if (verify_ordered(last, entry) < 0) {
 105                                 fprintf(stderr, "tree %s not ordered\n",
 106                                         sha1_to_hex(item->object.sha1));
 107                                 return -1;
 108                         }
 109                 }
 110
 111                 last = entry;
 112         }
 113
 114         if (has_full_path) {
 115                 fprintf(stderr, "warning: fsck-cache: tree %s "
 116                         "has full pathnames in it\n",
 117                         sha1_to_hex(item->object.sha1));
 118         }
 119
 120         return 0;
 121 }
 122
 123 static int fsck_commit(struct commit *commit)
 124 {
 125         if (!commit->tree)
 126                 return -1;
 127         if (!commit->parents && show_root)
 128                 printf("root %s\n", sha1_to_hex(commit->object.sha1));
 129         if (!commit->date)
 130                 printf("bad commit date in %s\n",
 131                        sha1_to_hex(commit->object.sha1));
 132         return 0;
 133 }
 134
 135 static int fsck_tag(struct tag *tag)
 136 {
 137         struct object *tagged = tag->tagged;
 138
 139         if (!tagged) {
 140                 printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
 141                 return -1;
 142         }
 143         if (!show_tags)
 144                 return 0;
 145
 146         printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
 147         printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 148         return 0;
 149 }
 150
 151 static int fsck_sha1(unsigned char *sha1)
 152 {
 153         struct object *obj = parse_object(sha1);
 154         if (!obj)
 155                 return -1;
 156         if (obj->type == blob_type)
 157                 return 0;
 158         if (obj->type == tree_type)
 159                 return fsck_tree((struct tree *) obj);
 160         if (obj->type == commit_type)
 161                 return fsck_commit((struct commit *) obj);
 162         if (obj->type == tag_type)
 163                 return fsck_tag((struct tag *) obj);
 164         return -1;
 165 }
 166
 167 /*
 168  * This is the sorting chunk size: make it reasonably
 169  * big so that we can sort well..
 170  */
 171 #define MAX_SHA1_ENTRIES (1024)
 172
 173 struct sha1_entry {
 174         unsigned long ino;
 175         unsigned char sha1[20];
 176 };
 177
 178 static struct {
 179         unsigned long nr;
 180         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 181 } sha1_list;
 182
 183 static int ino_compare(const void *_a, const void *_b)
 184 {
 185         const struct sha1_entry *a = _a, *b = _b;
 186         unsigned long ino1 = a->ino, ino2 = b->ino;
 187         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 188 }
 189
 190 static void fsck_sha1_list(void)
 191 {
 192         int i, nr = sha1_list.nr;
 193
 194         qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
 195         for (i = 0; i < nr; i++) {
 196                 struct sha1_entry *entry = sha1_list.entry[i];
 197                 unsigned char *sha1 = entry->sha1;
 198
 199                 sha1_list.entry[i] = NULL;
 200                 if (fsck_sha1(sha1) < 0)
 201                         fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
 202                 free(entry);
 203         }
 204         sha1_list.nr = 0;
 205 }
 206
 207 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 208 {
 209         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 210         int nr;
 211
 212         entry->ino = ino;
 213         memcpy(entry->sha1, sha1, 20);
 214         nr = sha1_list.nr;
 215         if (nr == MAX_SHA1_ENTRIES) {
 216                 fsck_sha1_list();
 217                 nr = 0;
 218         }
 219         sha1_list.entry[nr] = entry;
 220         sha1_list.nr = ++nr;
 221 }
 222
 223 static int fsck_dir(int i, char *path)
 224 {
 225         DIR *dir = opendir(path);
 226         struct dirent *de;
 227
 228         if (!dir) {
 229                 return error("missing sha1 directory '%s'", path);
 230         }
 231
 232         while ((de = readdir(dir)) != NULL) {
 233                 char name[100];
 234                 unsigned char sha1[20];
 235                 int len = strlen(de->d_name);
 236
 237                 switch (len) {
 238                 case 2:
 239                         if (de->d_name[1] != '.')
 240                                 break;
 241                 case 1:
 242                         if (de->d_name[0] != '.')
 243                                 break;
 244                         continue;
 245                 case 38:
 246                         sprintf(name, "%02x", i);
 247                         memcpy(name+2, de->d_name, len+1);
 248                         if (get_sha1_hex(name, sha1) < 0)
 249                                 break;
 250                         add_sha1_list(sha1, de->d_ino);
 251                         continue;
 252                 }
 253                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 254         }
 255         closedir(dir);
 256         return 0;
 257 }
 258
 259 int main(int argc, char **argv)
 260 {
 261         int i, heads;
 262         char *sha1_dir;
 263
 264         for (i = 1; i < argc; i++) {
 265                 const char *arg = argv[i];
 266
 267                 if (!strcmp(arg, "--unreachable")) {
 268                         show_unreachable = 1;
 269                         continue;
 270                 }
 271                 if (!strcmp(arg, "--tags")) {
 272                         show_tags = 1;
 273                         continue;
 274                 }
 275                 if (!strcmp(arg, "--root")) {
 276                         show_root = 1;
 277                         continue;
 278                 }
 279                 if (!strcmp(arg, "--cache")) {
 280                         keep_cache_objects = 1;
 281                         continue;
 282                 }
 283                 if (*arg == '-')
 284                         usage("fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
 285         }
 286
 287         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 288         for (i = 0; i < 256; i++) {
 289                 static char dir[4096];
 290                 sprintf(dir, "%s/%02x", sha1_dir, i);
 291                 fsck_dir(i, dir);
 292         }
 293         fsck_sha1_list();
 294
 295         heads = 0;
 296         for (i = 1; i < argc; i++) {
 297                 const char *arg = argv[i];
 298
 299                 if (*arg == '-')
 300                         continue;
 301
 302                 if (!get_sha1(arg, head_sha1)) {
 303                         struct commit *commit = lookup_commit(head_sha1);
 304                         struct object *obj;
 305
 306                         /* Error is printed by lookup_commit(). */
 307                         if (!commit)
 308                                 continue;
 309
 310                         obj = &commit->object;
 311                         obj->used = 1;
 312                         mark_reachable(obj, REACHABLE);
 313                         heads++;
 314                         continue;
 315                 }
 316                 error("expected sha1, got %s", arg);
 317         }
 318
 319         if (keep_cache_objects) {
 320                 int i;
 321                 read_cache();
 322                 for (i = 0; i < active_nr; i++) {
 323                         struct blob *blob = lookup_blob(active_cache[i]->sha1);
 324                         struct object *obj;
 325                         if (!blob)
 326                                 continue;
 327                         obj = &blob->object;
 328                         obj->used = 1;
 329                         mark_reachable(obj, REACHABLE);
 330                 }
 331         }
 332
 333         if (!heads && !keep_cache_objects) {
 334                 if (show_unreachable) {
 335                         fprintf(stderr, "unable to do reachability without a head nor --cache\n");
 336                         show_unreachable = 0;
 337                 }
 338                 if (!heads)
 339                         fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 340         }
 341
 342         check_connectivity();
 343         return 0;
 344 }