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fetch: fetch objects by their exact SHA-1 object names

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Teach "git fetch" to accept an exact SHA-1 object name the user may
obtain out of band on the LHS of a pathspec, and send it on a "want"
message when the server side advertises the allow-tip-sha1-in-want
capability.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2013-01-29 14:02:15 -08:00
parent 390eb36b0a
commit 6e7b66eebd
4 changed files with 67 additions and 2 deletions
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12
remote.c
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@ -15,6 +15,7 @@ static struct refspec s_tag_refspec = {
0,
1,
0,
0,
"refs/tags/*",
"refs/tags/*"
};
@ -565,9 +566,13 @@ static struct refspec *parse_refspec_internal(int nr_refspec, const char **refsp
flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
if (fetch) {
unsigned char unused[40];
/* LHS */
if (!*rs[i].src)
; /* empty is ok; it means "HEAD" */
else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
rs[i].exact_sha1 = 1; /* ok */
else if (!check_refname_format(rs[i].src, flags))
; /* valid looking ref is ok */
else
@ -1495,7 +1500,12 @@ int get_fetch_map(const struct ref *remote_refs,
} else {
const char *name = refspec->src[0] ? refspec->src : "HEAD";
ref_map = get_remote_ref(remote_refs, name);
if (refspec->exact_sha1) {
ref_map = alloc_ref(name);
get_sha1_hex(name, ref_map->old_sha1);
} else {
ref_map = get_remote_ref(remote_refs, name);
}
if (!missing_ok && !ref_map)
die("Couldn't find remote ref %s", name);
if (ref_map) {