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hard-code the empty tree object

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Now any commands may reference the empty tree object by its
sha1 (4b825dc642cb6eb9a060e54bf8d69288fbee4904). This is
useful for showing some diffs, especially for initial
commits.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2008-02-13 06:25:04 -05:00 committed by Junio C Hamano
parent 6c47d0e8f3
commit 346245a1bb
1 changed files with 11 additions and 0 deletions
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11
sha1_file.c
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@ -1845,6 +1845,15 @@ static struct cached_object {
} *cached_objects; } *cached_objects;
static int cached_object_nr, cached_object_alloc; static int cached_object_nr, cached_object_alloc;
static struct cached_object empty_tree = {
/* empty tree sha1: 4b825dc642cb6eb9a060e54bf8d69288fbee4904 */
"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60"
"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04",
OBJ_TREE,
"",
0
};
static struct cached_object *find_cached_object(const unsigned char *sha1) static struct cached_object *find_cached_object(const unsigned char *sha1)
{ {
int i; int i;
@ -1854,6 +1863,8 @@ static struct cached_object *find_cached_object(const unsigned char *sha1)
if (!hashcmp(co->sha1, sha1)) if (!hashcmp(co->sha1, sha1))
return co; return co;
} }
if (!hashcmp(sha1, empty_tree.sha1))
return &empty_tree;
return NULL; return NULL;
} }