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                                refs->item->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 /*
  57  * The entries in a tree are ordered in the _path_ order,
  58  * which means that a directory entry is ordered by adding
  59  * a slash to the end of it.
  60  *
  61  * So a directory called "a" is ordered _after_ a file
  62  * called "a.c", because "a/" sorts after "a.c".
  63  */
  64 static int verify_ordered(struct tree_entry_list *a, struct tree_entry_list *b)
  65 {
  66         int len1 = strlen(a->name);
  67         int len2 = strlen(b->name);
  68         int len = len1 < len2 ? len1 : len2;
  69         unsigned char c1, c2;
  70         int cmp;
  71
  72         cmp = memcmp(a->name, b->name, len);
  73         if (cmp < 0)
  74                 return 0;
  75         if (cmp > 0)
  76                 return -1;
  77
  78         /*
  79          * Ok, the first <len> characters are the same.
  80          * Now we need to order the next one, but turn
  81          * a '\0' into a '/' for a directory entry.
  82          */
  83         c1 = a->name[len];
  84         c2 = b->name[len];
  85         if (!c1 && a->directory)
  86                 c1 = '/';
  87         if (!c2 && b->directory)
  88                 c2 = '/';
  89         return c1 < c2 ? 0 : -1;
  90 }
  91
  92 static int fsck_tree(struct tree *item)
  93 {
  94         int has_full_path = 0;
  95         struct tree_entry_list *entry, *last;
  96
  97         last = NULL;
  98         for (entry = item->entries; entry; entry = entry->next) {
  99                 if (strchr(entry->name, '/'))
 100                         has_full_path = 1;
 101
 102                 if (last) {
 103                         if (verify_ordered(last, entry) < 0) {
 104                                 fprintf(stderr, "tree %s not ordered\n",
 105                                         sha1_to_hex(item->object.sha1));
 106                                 return -1;
 107                         }
 108                 }
 109
 110                 last = entry;
 111         }
 112
 113         if (has_full_path) {
 114                 fprintf(stderr, "warning: fsck-cache: tree %s "
 115                         "has full pathnames in it\n",
 116                         sha1_to_hex(item->object.sha1));
 117         }
 118
 119         return 0;
 120 }
 121
 122 static int fsck_commit(struct commit *commit)
 123 {
 124         if (!commit->tree)
 125                 return -1;
 126         if (!commit->parents && show_root)
 127                 printf("root %s\n", sha1_to_hex(commit->object.sha1));
 128         if (!commit->date)
 129                 printf("bad commit date in %s\n",
 130                        sha1_to_hex(commit->object.sha1));
 131         return 0;
 132 }
 133
 134 static int fsck_tag(struct tag *tag)
 135 {
 136         struct object *tagged = tag->tagged;
 137
 138         if (!tagged) {
 139                 printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
 140                 return -1;
 141         }
 142         if (!show_tags)
 143                 return 0;
 144
 145         printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
 146         printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 147         return 0;
 148 }
 149
 150 static int fsck_sha1(unsigned char *sha1)
 151 {
 152         struct object *obj = parse_object(sha1);
 153         if (!obj)
 154                 return -1;
 155         if (obj->type == blob_type)
 156                 return 0;
 157         if (obj->type == tree_type)
 158                 return fsck_tree((struct tree *) obj);
 159         if (obj->type == commit_type)
 160                 return fsck_commit((struct commit *) obj);
 161         if (obj->type == tag_type)
 162                 return fsck_tag((struct tag *) obj);
 163         return -1;
 164 }
 165
 166 /*
 167  * This is the sorting chunk size: make it reasonably
 168  * big so that we can sort well..
 169  */
 170 #define MAX_SHA1_ENTRIES (1024)
 171
 172 struct sha1_entry {
 173         unsigned long ino;
 174         unsigned char sha1[20];
 175 };
 176
 177 static struct {
 178         unsigned long nr;
 179         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 180 } sha1_list;
 181
 182 static int ino_compare(const void *_a, const void *_b)
 183 {
 184         const struct sha1_entry *a = _a, *b = _b;
 185         unsigned long ino1 = a->ino, ino2 = b->ino;
 186         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 187 }
 188
 189 static void fsck_sha1_list(void)
 190 {
 191         int i, nr = sha1_list.nr;
 192
 193         qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
 194         for (i = 0; i < nr; i++) {
 195                 struct sha1_entry *entry = sha1_list.entry[i];
 196                 unsigned char *sha1 = entry->sha1;
 197
 198                 sha1_list.entry[i] = NULL;
 199                 if (fsck_sha1(sha1) < 0)
 200                         fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
 201                 free(entry);
 202         }
 203         sha1_list.nr = 0;
 204 }
 205
 206 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 207 {
 208         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 209         int nr;
 210
 211         entry->ino = ino;
 212         memcpy(entry->sha1, sha1, 20);
 213         nr = sha1_list.nr;
 214         if (nr == MAX_SHA1_ENTRIES) {
 215                 fsck_sha1_list();
 216                 nr = 0;
 217         }
 218         sha1_list.entry[nr] = entry;
 219         sha1_list.nr = ++nr;
 220 }
 221
 222 static int fsck_dir(int i, char *path)
 223 {
 224         DIR *dir = opendir(path);
 225         struct dirent *de;
 226
 227         if (!dir) {
 228                 return error("missing sha1 directory '%s'", path);
 229         }
 230
 231         while ((de = readdir(dir)) != NULL) {
 232                 char name[100];
 233                 unsigned char sha1[20];
 234                 int len = strlen(de->d_name);
 235
 236                 switch (len) {
 237                 case 2:
 238                         if (de->d_name[1] != '.')
 239                                 break;
 240                 case 1:
 241                         if (de->d_name[0] != '.')
 242                                 break;
 243                         continue;
 244                 case 38:
 245                         sprintf(name, "%02x", i);
 246                         memcpy(name+2, de->d_name, len+1);
 247                         if (get_sha1_hex(name, sha1) < 0)
 248                                 break;
 249                         add_sha1_list(sha1, de->d_ino);
 250                         continue;
 251                 }
 252                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 253         }
 254         closedir(dir);
 255         return 0;
 256 }
 257
 258 int main(int argc, char **argv)
 259 {
 260         int i, heads;
 261         char *sha1_dir;
 262
 263         for (i = 1; i < argc; i++) {
 264                 const char *arg = argv[i];
 265
 266                 if (!strcmp(arg, "--unreachable")) {
 267                         show_unreachable = 1;
 268                         continue;
 269                 }
 270                 if (!strcmp(arg, "--tags")) {
 271                         show_tags = 1;
 272                         continue;
 273                 }
 274                 if (!strcmp(arg, "--root")) {
 275                         show_root = 1;
 276                         continue;
 277                 }
 278                 if (*arg == '-')
 279                         usage("fsck-cache [--tags] [[--unreachable] <head-sha1>*]");
 280         }
 281
 282         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 283         for (i = 0; i < 256; i++) {
 284                 static char dir[4096];
 285                 sprintf(dir, "%s/%02x", sha1_dir, i);
 286                 fsck_dir(i, dir);
 287         }
 288         fsck_sha1_list();
 289
 290         heads = 0;
 291         for (i = 1; i < argc; i++) {
 292                 const char *arg = argv[i];
 293
 294                 if (*arg == '-')
 295                         continue;
 296
 297                 if (!get_sha1(arg, head_sha1)) {
 298                         struct commit *commit = lookup_commit(head_sha1);
 299                         struct object *obj;
 300
 301                         /* Error is printed by lookup_commit(). */
 302                         if (!commit)
 303                                 continue;
 304
 305                         obj = &commit->object;
 306                         obj->used = 1;
 307                         mark_reachable(obj, REACHABLE);
 308                         heads++;
 309                         continue;
 310                 }
 311                 error("expected sha1, got %s", arg);
 312         }
 313
 314         if (!heads) {
 315                 if (show_unreachable) {
 316                         fprintf(stderr, "unable to do reachability without a head\n");
 317                         show_unreachable = 0;
 318                 }
 319                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 320         }
 321
 322         check_connectivity();
 323         return 0;
 324 }