Andrew's git - gitweb.git/blob

31c9a513951418991753bdaf8495d7c9ca7d0603
   1#include "cache.h"
   2#include "object.h"
   3#include "blob.h"
   4#include "tree.h"
   5#include "tree-walk.h"
   6#include "commit.h"
   7#include "tag.h"
   8#include "fsck.h"
   9
  10static int fsck_walk_tree(struct tree *tree, fsck_walk_func walk, void *data)
  11{
  12        struct tree_desc desc;
  13        struct name_entry entry;
  14        int res = 0;
  15
  16        if (parse_tree(tree))
  17                return -1;
  18
  19        init_tree_desc(&desc, tree->buffer, tree->size);
  20        while (tree_entry(&desc, &entry)) {
  21                int result;
  22
  23                if (S_ISGITLINK(entry.mode))
  24                        continue;
  25                if (S_ISDIR(entry.mode))
  26                        result = walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data);
  27                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
  28                        result = walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data);
  29                else {
  30                        result = error("in tree %s: entry %s has bad mode %.6o",
  31                                        sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
  32                }
  33                if (result < 0)
  34                        return result;
  35                if (!res)
  36                        res = result;
  37        }
  38        return res;
  39}
  40
  41static int fsck_walk_commit(struct commit *commit, fsck_walk_func walk, void *data)
  42{
  43        struct commit_list *parents;
  44        int res;
  45        int result;
  46
  47        if (parse_commit(commit))
  48                return -1;
  49
  50        result = walk((struct object *)commit->tree, OBJ_TREE, data);
  51        if (result < 0)
  52                return result;
  53        res = result;
  54
  55        parents = commit->parents;
  56        while (parents) {
  57                result = walk((struct object *)parents->item, OBJ_COMMIT, data);
  58                if (result < 0)
  59                        return result;
  60                if (!res)
  61                        res = result;
  62                parents = parents->next;
  63        }
  64        return res;
  65}
  66
  67static int fsck_walk_tag(struct tag *tag, fsck_walk_func walk, void *data)
  68{
  69        if (parse_tag(tag))
  70                return -1;
  71        return walk(tag->tagged, OBJ_ANY, data);
  72}
  73
  74int fsck_walk(struct object *obj, fsck_walk_func walk, void *data)
  75{
  76        if (!obj)
  77                return -1;
  78        switch (obj->type) {
  79        case OBJ_BLOB:
  80                return 0;
  81        case OBJ_TREE:
  82                return fsck_walk_tree((struct tree *)obj, walk, data);
  83        case OBJ_COMMIT:
  84                return fsck_walk_commit((struct commit *)obj, walk, data);
  85        case OBJ_TAG:
  86                return fsck_walk_tag((struct tag *)obj, walk, data);
  87        default:
  88                error("Unknown object type for %s", sha1_to_hex(obj->sha1));
  89                return -1;
  90        }
  91}
  92
  93/*
  94 * The entries in a tree are ordered in the _path_ order,
  95 * which means that a directory entry is ordered by adding
  96 * a slash to the end of it.
  97 *
  98 * So a directory called "a" is ordered _after_ a file
  99 * called "a.c", because "a/" sorts after "a.c".
 100 */
 101#define TREE_UNORDERED (-1)
 102#define TREE_HAS_DUPS  (-2)
 103
 104static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 105{
 106        int len1 = strlen(name1);
 107        int len2 = strlen(name2);
 108        int len = len1 < len2 ? len1 : len2;
 109        unsigned char c1, c2;
 110        int cmp;
 111
 112        cmp = memcmp(name1, name2, len);
 113        if (cmp < 0)
 114                return 0;
 115        if (cmp > 0)
 116                return TREE_UNORDERED;
 117
 118        /*
 119         * Ok, the first <len> characters are the same.
 120         * Now we need to order the next one, but turn
 121         * a '\0' into a '/' for a directory entry.
 122         */
 123        c1 = name1[len];
 124        c2 = name2[len];
 125        if (!c1 && !c2)
 126                /*
 127                 * git-write-tree used to write out a nonsense tree that has
 128                 * entries with the same name, one blob and one tree.  Make
 129                 * sure we do not have duplicate entries.
 130                 */
 131                return TREE_HAS_DUPS;
 132        if (!c1 && S_ISDIR(mode1))
 133                c1 = '/';
 134        if (!c2 && S_ISDIR(mode2))
 135                c2 = '/';
 136        return c1 < c2 ? 0 : TREE_UNORDERED;
 137}
 138
 139static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
 140{
 141        int retval;
 142        int has_null_sha1 = 0;
 143        int has_full_path = 0;
 144        int has_empty_name = 0;
 145        int has_dot = 0;
 146        int has_dotdot = 0;
 147        int has_zero_pad = 0;
 148        int has_bad_modes = 0;
 149        int has_dup_entries = 0;
 150        int not_properly_sorted = 0;
 151        struct tree_desc desc;
 152        unsigned o_mode;
 153        const char *o_name;
 154
 155        init_tree_desc(&desc, item->buffer, item->size);
 156
 157        o_mode = 0;
 158        o_name = NULL;
 159
 160        while (desc.size) {
 161                unsigned mode;
 162                const char *name;
 163                const unsigned char *sha1;
 164
 165                sha1 = tree_entry_extract(&desc, &name, &mode);
 166
 167                if (is_null_sha1(sha1))
 168                        has_null_sha1 = 1;
 169                if (strchr(name, '/'))
 170                        has_full_path = 1;
 171                if (!*name)
 172                        has_empty_name = 1;
 173                if (!strcmp(name, "."))
 174                        has_dot = 1;
 175                if (!strcmp(name, ".."))
 176                        has_dotdot = 1;
 177                has_zero_pad |= *(char *)desc.buffer == '0';
 178                update_tree_entry(&desc);
 179
 180                switch (mode) {
 181                /*
 182                 * Standard modes..
 183                 */
 184                case S_IFREG | 0755:
 185                case S_IFREG | 0644:
 186                case S_IFLNK:
 187                case S_IFDIR:
 188                case S_IFGITLINK:
 189                        break;
 190                /*
 191                 * This is nonstandard, but we had a few of these
 192                 * early on when we honored the full set of mode
 193                 * bits..
 194                 */
 195                case S_IFREG | 0664:
 196                        if (!strict)
 197                                break;
 198                default:
 199                        has_bad_modes = 1;
 200                }
 201
 202                if (o_name) {
 203                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 204                        case TREE_UNORDERED:
 205                                not_properly_sorted = 1;
 206                                break;
 207                        case TREE_HAS_DUPS:
 208                                has_dup_entries = 1;
 209                                break;
 210                        default:
 211                                break;
 212                        }
 213                }
 214
 215                o_mode = mode;
 216                o_name = name;
 217        }
 218
 219        retval = 0;
 220        if (has_null_sha1)
 221                retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
 222        if (has_full_path)
 223                retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
 224        if (has_empty_name)
 225                retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
 226        if (has_dot)
 227                retval += error_func(&item->object, FSCK_WARN, "contains '.'");
 228        if (has_dotdot)
 229                retval += error_func(&item->object, FSCK_WARN, "contains '..'");
 230        if (has_zero_pad)
 231                retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
 232        if (has_bad_modes)
 233                retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
 234        if (has_dup_entries)
 235                retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
 236        if (not_properly_sorted)
 237                retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
 238        return retval;
 239}
 240
 241static int fsck_ident(char **ident, struct object *obj, fsck_error error_func)
 242{
 243        if (**ident == '<')
 244                return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
 245        *ident += strcspn(*ident, "<>\n");
 246        if (**ident == '>')
 247                return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
 248        if (**ident != '<')
 249                return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
 250        if ((*ident)[-1] != ' ')
 251                return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
 252        (*ident)++;
 253        *ident += strcspn(*ident, "<>\n");
 254        if (**ident != '>')
 255                return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
 256        (*ident)++;
 257        if (**ident != ' ')
 258                return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
 259        (*ident)++;
 260        if (**ident == '0' && (*ident)[1] != ' ')
 261                return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
 262        *ident += strspn(*ident, "0123456789");
 263        if (**ident != ' ')
 264                return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
 265        (*ident)++;
 266        if ((**ident != '+' && **ident != '-') ||
 267            !isdigit((*ident)[1]) ||
 268            !isdigit((*ident)[2]) ||
 269            !isdigit((*ident)[3]) ||
 270            !isdigit((*ident)[4]) ||
 271            ((*ident)[5] != '\n'))
 272                return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
 273        (*ident) += 6;
 274        return 0;
 275}
 276
 277static int fsck_commit(struct commit *commit, fsck_error error_func)
 278{
 279        char *buffer = commit->buffer;
 280        unsigned char tree_sha1[20], sha1[20];
 281        struct commit_graft *graft;
 282        int parents = 0;
 283        int err;
 284
 285        if (commit->date == ULONG_MAX)
 286                return error_func(&commit->object, FSCK_ERROR, "invalid author/committer line");
 287
 288        if (memcmp(buffer, "tree ", 5))
 289                return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
 290        if (get_sha1_hex(buffer+5, tree_sha1) || buffer[45] != '\n')
 291                return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
 292        buffer += 46;
 293        while (!memcmp(buffer, "parent ", 7)) {
 294                if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
 295                        return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
 296                buffer += 48;
 297                parents++;
 298        }
 299        graft = lookup_commit_graft(commit->object.sha1);
 300        if (graft) {
 301                struct commit_list *p = commit->parents;
 302                parents = 0;
 303                while (p) {
 304                        p = p->next;
 305                        parents++;
 306                }
 307                if (graft->nr_parent == -1 && !parents)
 308                        ; /* shallow commit */
 309                else if (graft->nr_parent != parents)
 310                        return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
 311        } else {
 312                struct commit_list *p = commit->parents;
 313                while (p && parents) {
 314                        p = p->next;
 315                        parents--;
 316                }
 317                if (p || parents)
 318                        return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
 319        }
 320        if (memcmp(buffer, "author ", 7))
 321                return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
 322        buffer += 7;
 323        err = fsck_ident(&buffer, &commit->object, error_func);
 324        if (err)
 325                return err;
 326        if (memcmp(buffer, "committer ", strlen("committer ")))
 327                return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
 328        buffer += strlen("committer ");
 329        err = fsck_ident(&buffer, &commit->object, error_func);
 330        if (err)
 331                return err;
 332        if (!commit->tree)
 333                return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 334
 335        return 0;
 336}
 337
 338static int fsck_tag(struct tag *tag, fsck_error error_func)
 339{
 340        struct object *tagged = tag->tagged;
 341
 342        if (!tagged)
 343                return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
 344        return 0;
 345}
 346
 347int fsck_object(struct object *obj, int strict, fsck_error error_func)
 348{
 349        if (!obj)
 350                return error_func(obj, FSCK_ERROR, "no valid object to fsck");
 351
 352        if (obj->type == OBJ_BLOB)
 353                return 0;
 354        if (obj->type == OBJ_TREE)
 355                return fsck_tree((struct tree *) obj, strict, error_func);
 356        if (obj->type == OBJ_COMMIT)
 357                return fsck_commit((struct commit *) obj, error_func);
 358        if (obj->type == OBJ_TAG)
 359                return fsck_tag((struct tag *) obj, error_func);
 360
 361        return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
 362                          obj->type);
 363}
 364
 365int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
 366{
 367        va_list ap;
 368        struct strbuf sb = STRBUF_INIT;
 369
 370        strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
 371
 372        va_start(ap, fmt);
 373        strbuf_vaddf(&sb, fmt, ap);
 374        va_end(ap);
 375
 376        error("%s", sb.buf);
 377        strbuf_release(&sb);
 378        return 1;
 379}