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mktree: validate entry type in input

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Previously mktree would accept tree entries which had a mismatch between
the declared type and the actual type of object.  Check the actual type of
the object when it is available locally.

Signed-off-by: Josh Micich <josh.micich@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Josh Micich 2009-05-14 15:49:10 -07:00 committed by Junio C Hamano
parent f1cf2d8b14
commit 31c8221acb
1 changed files with 33 additions and 10 deletions
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43
builtin-mktree.c
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@ -71,7 +71,8 @@ static void mktree_line(char *buf, size_t len, int line_termination, int allow_m
{
char *ptr, *ntr;
unsigned mode;
enum object_type type;
enum object_type mode_type; /* object type derived from mode */
enum object_type obj_type; /* object type derived from sha */
char *path;
unsigned char sha1[20];
@ -94,17 +95,8 @@ static void mktree_line(char *buf, size_t len, int line_termination, int allow_m
if (S_ISGITLINK(mode))
allow_missing = 1;
if (!allow_missing)
type = sha1_object_info(sha1, NULL);
else
type = object_type(mode);
if (type < 0)
die("object %s unavailable", sha1_to_hex(sha1));
*ntr++ = 0; /* now at the beginning of SHA1 */
if (type != type_from_string(ptr))
die("object type %s mismatch (%s)", ptr, typename(type));
path = ntr + 41; /* at the beginning of name */
if (line_termination && path[0] == '"') {
@ -113,6 +105,37 @@ static void mktree_line(char *buf, size_t len, int line_termination, int allow_m
die("invalid quoting");
path = strbuf_detach(&p_uq, NULL);
}
/*
* Object type is redundantly derivable three ways.
* These should all agree.
*/
mode_type = object_type(mode);
if (mode_type != type_from_string(ptr)) {
die("entry '%s' object type (%s) doesn't match mode type (%s)",
path, ptr, typename(mode_type));
}
/* Check the type of object identified by sha1 */
obj_type = sha1_object_info(sha1, NULL);
if (obj_type < 0) {
if (allow_missing) {
; /* no problem - missing objects are presumed to be of the right type */
} else {
die("entry '%s' object %s is unavailable", path, sha1_to_hex(sha1));
}
} else {
if (obj_type != mode_type) {
/*
* The object exists but is of the wrong type.
* This is a problem regardless of allow_missing
* because the new tree entry will never be correct.
*/
die("entry '%s' object %s is a %s but specified type was (%s)",
path, sha1_to_hex(sha1), typename(obj_type), typename(mode_type));
}
}
append_to_tree(mode, sha1, path);
}