fsck: check tag objects' headers

We inspect commit objects pretty much in detail in git-fsck, but we just
glanced over the tag objects. Let's be stricter.

Since we do not want to limit 'tag' lines unduly, values that would fail
the refname check only result in warnings, not errors.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2014-09-11 16:26:38 +02:00 коммит произвёл Junio C Hamano
Родитель 4d0d89755e
Коммит cec097be3a
1 изменённых файлов: 85 добавлений и 1 удалений

86
fsck.c
Просмотреть файл

@ -6,6 +6,7 @@
#include "commit.h"
#include "tag.h"
#include "fsck.h"
#include "refs.h"
static int fsck_walk_tree(struct tree *tree, fsck_walk_func walk, void *data)
{
@ -355,6 +356,88 @@ static int fsck_commit(struct commit *commit, const char *data,
return ret;
}
static int fsck_tag_buffer(struct tag *tag, const char *data,
unsigned long size, fsck_error error_func)
{
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 error_func(&tag->object, FSCK_ERROR,
"cannot read tag object");
if (type != OBJ_TAG) {
ret = error_func(&tag->object, FSCK_ERROR,
"expected tag got %s",
typename(type));
goto done;
}
}
if (require_end_of_header(buffer, size, &tag->object, error_func))
goto done;
if (!skip_prefix(buffer, "object ", &buffer)) {
ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'object' line");
goto done;
}
if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
ret = error_func(&tag->object, FSCK_ERROR, "invalid 'object' line format - bad sha1");
goto done;
}
buffer += 41;
if (!skip_prefix(buffer, "type ", &buffer)) {
ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'type' line");
goto done;
}
eol = strchr(buffer, '\n');
if (!eol) {
ret = error_func(&tag->object, FSCK_ERROR, "invalid format - unexpected end after 'type' line");
goto done;
}
if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
ret = error_func(&tag->object, FSCK_ERROR, "invalid 'type' value");
if (ret)
goto done;
buffer = eol + 1;
if (!skip_prefix(buffer, "tag ", &buffer)) {
ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'tag' line");
goto done;
}
eol = strchr(buffer, '\n');
if (!eol) {
ret = error_func(&tag->object, FSCK_ERROR, "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))
error_func(&tag->object, FSCK_WARN, "invalid 'tag' name: %s", buffer);
buffer = eol + 1;
if (!skip_prefix(buffer, "tagger ", &buffer))
/* early tags do not contain 'tagger' lines; warn only */
error_func(&tag->object, FSCK_WARN, "invalid format - expected 'tagger' line");
else
ret = fsck_ident(&buffer, &tag->object, error_func);
done:
strbuf_release(&sb);
free(to_free);
return ret;
}
static int fsck_tag(struct tag *tag, const char *data,
unsigned long size, fsck_error error_func)
{
@ -362,7 +445,8 @@ static int fsck_tag(struct tag *tag, const char *data,
if (!tagged)
return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
return 0;
return fsck_tag_buffer(tag, data, size, error_func);
}
int fsck_object(struct object *obj, void *data, unsigned long size,