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 /*
  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         if (!show_tags)
 137                 return 0;
 138
 139         printf("tagged %s %s",
 140                tag->tagged->type,
 141                sha1_to_hex(tag->tagged->sha1));
 142         printf(" (%s) in %s\n",
 143                tag->tag, sha1_to_hex(tag->object.sha1));
 144         return 0;
 145 }
 146
 147 static int fsck_sha1(unsigned char *sha1)
 148 {
 149         struct object *obj = parse_object(sha1);
 150         if (!obj)
 151                 return -1;
 152         if (obj->type == blob_type)
 153                 return 0;
 154         if (obj->type == tree_type)
 155                 return fsck_tree((struct tree *) obj);
 156         if (obj->type == commit_type)
 157                 return fsck_commit((struct commit *) obj);
 158         if (obj->type == tag_type)
 159                 return fsck_tag((struct tag *) obj);
 160         return -1;
 161 }
 162
 163 /*
 164  * This is the sorting chunk size: make it reasonably
 165  * big so that we can sort well..
 166  */
 167 #define MAX_SHA1_ENTRIES (1024)
 168
 169 struct sha1_entry {
 170         unsigned long ino;
 171         unsigned char sha1[20];
 172 };
 173
 174 static struct {
 175         unsigned long nr;
 176         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 177 } sha1_list;
 178
 179 static int ino_compare(const void *_a, const void *_b)
 180 {
 181         const struct sha1_entry *a = _a, *b = _b;
 182         unsigned long ino1 = a->ino, ino2 = b->ino;
 183         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 184 }
 185
 186 static void fsck_sha1_list(void)
 187 {
 188         int i, nr = sha1_list.nr;
 189
 190         qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
 191         for (i = 0; i < nr; i++) {
 192                 struct sha1_entry *entry = sha1_list.entry[i];
 193                 unsigned char *sha1 = entry->sha1;
 194
 195                 sha1_list.entry[i] = NULL;
 196                 if (fsck_sha1(sha1) < 0)
 197                         fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
 198                 free(entry);
 199         }
 200         sha1_list.nr = 0;
 201 }
 202
 203 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 204 {
 205         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 206         int nr;
 207
 208         entry->ino = ino;
 209         memcpy(entry->sha1, sha1, 20);
 210         nr = sha1_list.nr;
 211         if (nr == MAX_SHA1_ENTRIES) {
 212                 fsck_sha1_list();
 213                 nr = 0;
 214         }
 215         sha1_list.entry[nr] = entry;
 216         sha1_list.nr = ++nr;
 217 }
 218
 219 static int fsck_dir(int i, char *path)
 220 {
 221         DIR *dir = opendir(path);
 222         struct dirent *de;
 223
 224         if (!dir) {
 225                 return error("missing sha1 directory '%s'", path);
 226         }
 227
 228         while ((de = readdir(dir)) != NULL) {
 229                 char name[100];
 230                 unsigned char sha1[20];
 231                 int len = strlen(de->d_name);
 232
 233                 switch (len) {
 234                 case 2:
 235                         if (de->d_name[1] != '.')
 236                                 break;
 237                 case 1:
 238                         if (de->d_name[0] != '.')
 239                                 break;
 240                         continue;
 241                 case 38:
 242                         sprintf(name, "%02x", i);
 243                         memcpy(name+2, de->d_name, len+1);
 244                         if (get_sha1_hex(name, sha1) < 0)
 245                                 break;
 246                         add_sha1_list(sha1, de->d_ino);
 247                         continue;
 248                 }
 249                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 250         }
 251         closedir(dir);
 252         return 0;
 253 }
 254
 255 int main(int argc, char **argv)
 256 {
 257         int i, heads;
 258         char *sha1_dir;
 259
 260         for (i = 1; i < argc; i++) {
 261                 const char *arg = argv[i];
 262
 263                 if (!strcmp(arg, "--unreachable")) {
 264                         show_unreachable = 1;
 265                         continue;
 266                 }
 267                 if (!strcmp(arg, "--tags")) {
 268                         show_tags = 1;
 269                         continue;
 270                 }
 271                 if (!strcmp(arg, "--root")) {
 272                         show_root = 1;
 273                         continue;
 274                 }
 275                 if (*arg == '-')
 276                         usage("fsck-cache [--tags] [[--unreachable] <head-sha1>*]");
 277         }
 278
 279         sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 280         for (i = 0; i < 256; i++) {
 281                 static char dir[4096];
 282                 sprintf(dir, "%s/%02x", sha1_dir, i);
 283                 fsck_dir(i, dir);
 284         }
 285         fsck_sha1_list();
 286
 287         heads = 0;
 288         for (i = 1; i < argc; i++) {
 289                 const char *arg = argv[i];
 290
 291                 if (*arg == '-')
 292                         continue;
 293
 294                 if (!get_sha1(arg, head_sha1)) {
 295                         struct commit *commit = lookup_commit(head_sha1);
 296                         struct object *obj;
 297
 298                         /* Error is printed by lookup_commit(). */
 299                         if (!commit)
 300                                 continue;
 301
 302                         obj = &commit->object;
 303                         obj->used = 1;
 304                         mark_reachable(obj, REACHABLE);
 305                         heads++;
 306                         continue;
 307                 }
 308                 error("expected sha1, got %s", arg);
 309         }
 310
 311         if (!heads) {
 312                 if (show_unreachable) {
 313                         fprintf(stderr, "unable to do reachability without a head\n");
 314                         show_unreachable = 0;
 315                 }
 316                 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 317         }
 318
 319         check_connectivity();
 320         return 0;
 321 }