Allow to control where the replace refs are looked for

It can be useful to have grafts or replace refs for specific use-cases while
keeping the default "view" of the repository pristine (or with a different
set of grafts/replace refs).

It is possible to use a different graft file with GIT_GRAFT_FILE, but while
replace refs are more powerful, they don't have an equivalent override.

Add a GIT_REPLACE_REF_BASE environment variable to control where git is
going to look for replace refs.

Signed-off-by: Mike Hommey <mh@glandium.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/log-tree.c b/log-tree.c
index 8dba7be..9c25bbc 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -96,11 +96,12 @@ static int add_ref_decoration(const char *refname, const unsigned char *sha1, in
 
 	assert(cb_data == NULL);
 
-	if (starts_with(refname, "refs/replace/")) {
+	if (starts_with(refname, git_replace_ref_base)) {
 		unsigned char original_sha1[20];
 		if (!check_replace_refs)
 			return 0;
-		if (get_sha1_hex(refname + 13, original_sha1)) {
+		if (get_sha1_hex(refname + strlen(git_replace_ref_base),
+				 original_sha1)) {
 			warning("invalid replace ref %s", refname);
 			return 0;
 		}