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![Johannes Schindelin](/assets/img/avatar_default.png)
Instead of specifying whether a message by the fsck machinery constitutes an error or a warning, let's specify an identifier relating to the concrete problem that was encountered. This is necessary for upcoming support to be able to demote certain errors to warnings. In the process, simplify the requirements on the calling code: instead of having to handle full-blown varargs in every callback, we now send a string buffer ready to be used by the callback. We could use a simple enum for the message IDs here, but we want to guarantee that the enum values are associated with the appropriate message types (i.e. error or warning?). Besides, we want to introduce a parser in the next commit that maps the string representation to the enum value, hence we use the slightly ugly preprocessor construct that is extensible for use with said parser. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
579 lines
16 KiB
C
579 lines
16 KiB
C
#include "cache.h"
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#include "object.h"
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#include "blob.h"
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#include "tree.h"
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#include "tree-walk.h"
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#include "commit.h"
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#include "tag.h"
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#include "fsck.h"
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#include "refs.h"
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#include "utf8.h"
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#define FOREACH_MSG_ID(FUNC) \
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/* errors */ \
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FUNC(BAD_DATE, ERROR) \
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FUNC(BAD_DATE_OVERFLOW, ERROR) \
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FUNC(BAD_EMAIL, ERROR) \
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FUNC(BAD_NAME, ERROR) \
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FUNC(BAD_OBJECT_SHA1, ERROR) \
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FUNC(BAD_PARENT_SHA1, ERROR) \
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FUNC(BAD_TAG_OBJECT, ERROR) \
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FUNC(BAD_TIMEZONE, ERROR) \
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FUNC(BAD_TREE, ERROR) \
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FUNC(BAD_TREE_SHA1, ERROR) \
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FUNC(BAD_TYPE, ERROR) \
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FUNC(DUPLICATE_ENTRIES, ERROR) \
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FUNC(MISSING_AUTHOR, ERROR) \
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FUNC(MISSING_COMMITTER, ERROR) \
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FUNC(MISSING_EMAIL, ERROR) \
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FUNC(MISSING_GRAFT, ERROR) \
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FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
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FUNC(MISSING_OBJECT, ERROR) \
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FUNC(MISSING_PARENT, ERROR) \
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FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
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FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
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FUNC(MISSING_TAG, ERROR) \
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FUNC(MISSING_TAG_ENTRY, ERROR) \
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FUNC(MISSING_TAG_OBJECT, ERROR) \
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FUNC(MISSING_TREE, ERROR) \
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FUNC(MISSING_TYPE, ERROR) \
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FUNC(MISSING_TYPE_ENTRY, ERROR) \
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FUNC(NUL_IN_HEADER, ERROR) \
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FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
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FUNC(TREE_NOT_SORTED, ERROR) \
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FUNC(UNKNOWN_TYPE, ERROR) \
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FUNC(UNTERMINATED_HEADER, ERROR) \
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FUNC(ZERO_PADDED_DATE, ERROR) \
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/* warnings */ \
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FUNC(BAD_FILEMODE, WARN) \
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FUNC(BAD_TAG_NAME, WARN) \
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FUNC(EMPTY_NAME, WARN) \
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FUNC(FULL_PATHNAME, WARN) \
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FUNC(HAS_DOT, WARN) \
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FUNC(HAS_DOTDOT, WARN) \
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FUNC(HAS_DOTGIT, WARN) \
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FUNC(MISSING_TAGGER_ENTRY, WARN) \
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FUNC(NULL_SHA1, WARN) \
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FUNC(ZERO_PADDED_FILEMODE, WARN)
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#define MSG_ID(id, msg_type) FSCK_MSG_##id,
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enum fsck_msg_id {
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FOREACH_MSG_ID(MSG_ID)
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FSCK_MSG_MAX
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};
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#undef MSG_ID
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#define MSG_ID(id, msg_type) { FSCK_##msg_type },
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static struct {
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int msg_type;
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} msg_id_info[FSCK_MSG_MAX + 1] = {
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FOREACH_MSG_ID(MSG_ID)
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{ -1 }
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};
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#undef MSG_ID
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static int fsck_msg_type(enum fsck_msg_id msg_id,
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struct fsck_options *options)
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{
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int msg_type;
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msg_type = msg_id_info[msg_id].msg_type;
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if (options->strict && msg_type == FSCK_WARN)
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msg_type = FSCK_ERROR;
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return msg_type;
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}
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__attribute__((format (printf, 4, 5)))
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static int report(struct fsck_options *options, struct object *object,
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enum fsck_msg_id id, const char *fmt, ...)
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{
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va_list ap;
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struct strbuf sb = STRBUF_INIT;
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int msg_type = fsck_msg_type(id, options), result;
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va_start(ap, fmt);
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strbuf_vaddf(&sb, fmt, ap);
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result = options->error_func(object, msg_type, sb.buf);
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strbuf_release(&sb);
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va_end(ap);
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return result;
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}
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static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
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{
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struct tree_desc desc;
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struct name_entry entry;
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int res = 0;
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if (parse_tree(tree))
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return -1;
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init_tree_desc(&desc, tree->buffer, tree->size);
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while (tree_entry(&desc, &entry)) {
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int result;
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if (S_ISGITLINK(entry.mode))
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continue;
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if (S_ISDIR(entry.mode))
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result = options->walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data, options);
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else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
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result = options->walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data, options);
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else {
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result = error("in tree %s: entry %s has bad mode %.6o",
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sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
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}
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if (result < 0)
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return result;
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if (!res)
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res = result;
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}
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return res;
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}
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static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
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{
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struct commit_list *parents;
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int res;
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int result;
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if (parse_commit(commit))
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return -1;
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result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
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if (result < 0)
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return result;
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res = result;
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parents = commit->parents;
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while (parents) {
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result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
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if (result < 0)
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return result;
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if (!res)
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res = result;
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parents = parents->next;
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}
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return res;
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}
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static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
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{
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if (parse_tag(tag))
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return -1;
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return options->walk(tag->tagged, OBJ_ANY, data, options);
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}
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int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
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{
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if (!obj)
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return -1;
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switch (obj->type) {
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case OBJ_BLOB:
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return 0;
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case OBJ_TREE:
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return fsck_walk_tree((struct tree *)obj, data, options);
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case OBJ_COMMIT:
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return fsck_walk_commit((struct commit *)obj, data, options);
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case OBJ_TAG:
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return fsck_walk_tag((struct tag *)obj, data, options);
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default:
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error("Unknown object type for %s", sha1_to_hex(obj->sha1));
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return -1;
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}
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}
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/*
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* The entries in a tree are ordered in the _path_ order,
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* which means that a directory entry is ordered by adding
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* a slash to the end of it.
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*
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* So a directory called "a" is ordered _after_ a file
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* called "a.c", because "a/" sorts after "a.c".
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*/
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#define TREE_UNORDERED (-1)
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#define TREE_HAS_DUPS (-2)
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static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
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{
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int len1 = strlen(name1);
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int len2 = strlen(name2);
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int len = len1 < len2 ? len1 : len2;
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unsigned char c1, c2;
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int cmp;
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cmp = memcmp(name1, name2, len);
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if (cmp < 0)
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return 0;
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if (cmp > 0)
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return TREE_UNORDERED;
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/*
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* Ok, the first <len> characters are the same.
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* Now we need to order the next one, but turn
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* a '\0' into a '/' for a directory entry.
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*/
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c1 = name1[len];
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c2 = name2[len];
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if (!c1 && !c2)
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/*
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* git-write-tree used to write out a nonsense tree that has
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* entries with the same name, one blob and one tree. Make
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* sure we do not have duplicate entries.
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*/
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return TREE_HAS_DUPS;
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if (!c1 && S_ISDIR(mode1))
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c1 = '/';
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if (!c2 && S_ISDIR(mode2))
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c2 = '/';
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return c1 < c2 ? 0 : TREE_UNORDERED;
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}
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static int fsck_tree(struct tree *item, struct fsck_options *options)
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{
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int retval;
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int has_null_sha1 = 0;
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int has_full_path = 0;
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int has_empty_name = 0;
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int has_dot = 0;
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int has_dotdot = 0;
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int has_dotgit = 0;
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int has_zero_pad = 0;
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int has_bad_modes = 0;
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int has_dup_entries = 0;
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int not_properly_sorted = 0;
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struct tree_desc desc;
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unsigned o_mode;
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const char *o_name;
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init_tree_desc(&desc, item->buffer, item->size);
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o_mode = 0;
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o_name = NULL;
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while (desc.size) {
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unsigned mode;
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const char *name;
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const unsigned char *sha1;
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sha1 = tree_entry_extract(&desc, &name, &mode);
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has_null_sha1 |= is_null_sha1(sha1);
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has_full_path |= !!strchr(name, '/');
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has_empty_name |= !*name;
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has_dot |= !strcmp(name, ".");
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has_dotdot |= !strcmp(name, "..");
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has_dotgit |= (!strcmp(name, ".git") ||
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is_hfs_dotgit(name) ||
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is_ntfs_dotgit(name));
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has_zero_pad |= *(char *)desc.buffer == '0';
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update_tree_entry(&desc);
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switch (mode) {
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/*
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* Standard modes..
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*/
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case S_IFREG | 0755:
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case S_IFREG | 0644:
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case S_IFLNK:
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case S_IFDIR:
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case S_IFGITLINK:
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break;
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/*
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* This is nonstandard, but we had a few of these
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* early on when we honored the full set of mode
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* bits..
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*/
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case S_IFREG | 0664:
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if (!options->strict)
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break;
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default:
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has_bad_modes = 1;
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}
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if (o_name) {
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switch (verify_ordered(o_mode, o_name, mode, name)) {
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case TREE_UNORDERED:
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not_properly_sorted = 1;
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break;
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case TREE_HAS_DUPS:
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has_dup_entries = 1;
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break;
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default:
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break;
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}
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}
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o_mode = mode;
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o_name = name;
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}
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retval = 0;
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if (has_null_sha1)
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retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
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if (has_full_path)
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retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
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if (has_empty_name)
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retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
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if (has_dot)
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retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
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if (has_dotdot)
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retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
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if (has_dotgit)
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retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
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if (has_zero_pad)
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retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
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if (has_bad_modes)
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retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
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if (has_dup_entries)
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retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
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if (not_properly_sorted)
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retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
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return retval;
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}
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static int require_end_of_header(const void *data, unsigned long size,
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struct object *obj, struct fsck_options *options)
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{
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const char *buffer = (const char *)data;
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unsigned long i;
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for (i = 0; i < size; i++) {
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switch (buffer[i]) {
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case '\0':
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return report(options, obj,
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FSCK_MSG_NUL_IN_HEADER,
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"unterminated header: NUL at offset %ld", i);
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case '\n':
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if (i + 1 < size && buffer[i + 1] == '\n')
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return 0;
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}
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}
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return report(options, obj,
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FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
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}
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static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
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{
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char *end;
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if (**ident == '<')
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return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
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*ident += strcspn(*ident, "<>\n");
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if (**ident == '>')
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return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
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if (**ident != '<')
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return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
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if ((*ident)[-1] != ' ')
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return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
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(*ident)++;
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*ident += strcspn(*ident, "<>\n");
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if (**ident != '>')
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return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
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(*ident)++;
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if (**ident != ' ')
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return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
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(*ident)++;
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if (**ident == '0' && (*ident)[1] != ' ')
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return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
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if (date_overflows(strtoul(*ident, &end, 10)))
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return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
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if (end == *ident || *end != ' ')
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return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
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*ident = end + 1;
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if ((**ident != '+' && **ident != '-') ||
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!isdigit((*ident)[1]) ||
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!isdigit((*ident)[2]) ||
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!isdigit((*ident)[3]) ||
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!isdigit((*ident)[4]) ||
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((*ident)[5] != '\n'))
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return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
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(*ident) += 6;
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return 0;
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}
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static int fsck_commit_buffer(struct commit *commit, const char *buffer,
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unsigned long size, struct fsck_options *options)
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{
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unsigned char tree_sha1[20], sha1[20];
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struct commit_graft *graft;
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unsigned parent_count, parent_line_count = 0;
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int err;
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if (require_end_of_header(buffer, size, &commit->object, options))
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return -1;
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if (!skip_prefix(buffer, "tree ", &buffer))
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return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
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if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
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return report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
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buffer += 41;
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while (skip_prefix(buffer, "parent ", &buffer)) {
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if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
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return report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
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buffer += 41;
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parent_line_count++;
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}
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graft = lookup_commit_graft(commit->object.sha1);
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parent_count = commit_list_count(commit->parents);
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if (graft) {
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if (graft->nr_parent == -1 && !parent_count)
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; /* shallow commit */
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else if (graft->nr_parent != parent_count)
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return report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
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} else {
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if (parent_count != parent_line_count)
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return report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
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}
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if (!skip_prefix(buffer, "author ", &buffer))
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return report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
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err = fsck_ident(&buffer, &commit->object, options);
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if (err)
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return err;
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if (!skip_prefix(buffer, "committer ", &buffer))
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return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
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err = fsck_ident(&buffer, &commit->object, options);
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if (err)
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return err;
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if (!commit->tree)
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return report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
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return 0;
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}
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static int fsck_commit(struct commit *commit, const char *data,
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unsigned long size, struct fsck_options *options)
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{
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const char *buffer = data ? data : get_commit_buffer(commit, &size);
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int ret = fsck_commit_buffer(commit, buffer, size, options);
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if (!data)
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unuse_commit_buffer(commit, buffer);
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return ret;
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}
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static int fsck_tag_buffer(struct tag *tag, const char *data,
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unsigned long size, struct fsck_options *options)
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{
|
|
unsigned char sha1[20];
|
|
int ret = 0;
|
|
const char *buffer;
|
|
char *to_free = NULL, *eol;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
if (data)
|
|
buffer = data;
|
|
else {
|
|
enum object_type type;
|
|
|
|
buffer = to_free =
|
|
read_sha1_file(tag->object.sha1, &type, &size);
|
|
if (!buffer)
|
|
return report(options, &tag->object,
|
|
FSCK_MSG_MISSING_TAG_OBJECT,
|
|
"cannot read tag object");
|
|
|
|
if (type != OBJ_TAG) {
|
|
ret = report(options, &tag->object,
|
|
FSCK_MSG_TAG_OBJECT_NOT_TAG,
|
|
"expected tag got %s",
|
|
typename(type));
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (require_end_of_header(buffer, size, &tag->object, options))
|
|
goto done;
|
|
|
|
if (!skip_prefix(buffer, "object ", &buffer)) {
|
|
ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
|
|
goto done;
|
|
}
|
|
if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
|
|
ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
|
|
goto done;
|
|
}
|
|
buffer += 41;
|
|
|
|
if (!skip_prefix(buffer, "type ", &buffer)) {
|
|
ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
|
|
goto done;
|
|
}
|
|
eol = strchr(buffer, '\n');
|
|
if (!eol) {
|
|
ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
|
|
goto done;
|
|
}
|
|
if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
|
|
ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
|
|
if (ret)
|
|
goto done;
|
|
buffer = eol + 1;
|
|
|
|
if (!skip_prefix(buffer, "tag ", &buffer)) {
|
|
ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
|
|
goto done;
|
|
}
|
|
eol = strchr(buffer, '\n');
|
|
if (!eol) {
|
|
ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
|
|
goto done;
|
|
}
|
|
strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
|
|
if (check_refname_format(sb.buf, 0))
|
|
report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
|
|
"invalid 'tag' name: %.*s",
|
|
(int)(eol - buffer), buffer);
|
|
buffer = eol + 1;
|
|
|
|
if (!skip_prefix(buffer, "tagger ", &buffer))
|
|
/* early tags do not contain 'tagger' lines; warn only */
|
|
report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
|
|
else
|
|
ret = fsck_ident(&buffer, &tag->object, options);
|
|
|
|
done:
|
|
strbuf_release(&sb);
|
|
free(to_free);
|
|
return ret;
|
|
}
|
|
|
|
static int fsck_tag(struct tag *tag, const char *data,
|
|
unsigned long size, struct fsck_options *options)
|
|
{
|
|
struct object *tagged = tag->tagged;
|
|
|
|
if (!tagged)
|
|
return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
|
|
|
|
return fsck_tag_buffer(tag, data, size, options);
|
|
}
|
|
|
|
int fsck_object(struct object *obj, void *data, unsigned long size,
|
|
struct fsck_options *options)
|
|
{
|
|
if (!obj)
|
|
return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
|
|
|
|
if (obj->type == OBJ_BLOB)
|
|
return 0;
|
|
if (obj->type == OBJ_TREE)
|
|
return fsck_tree((struct tree *) obj, options);
|
|
if (obj->type == OBJ_COMMIT)
|
|
return fsck_commit((struct commit *) obj, (const char *) data,
|
|
size, options);
|
|
if (obj->type == OBJ_TAG)
|
|
return fsck_tag((struct tag *) obj, (const char *) data,
|
|
size, options);
|
|
|
|
return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
|
|
obj->type);
|
|
}
|
|
|
|
int fsck_error_function(struct object *obj, int msg_type, const char *message)
|
|
{
|
|
error("object %s: %s", sha1_to_hex(obj->sha1), message);
|
|
return 1;
|
|
}
|