[PATCH 3/6] bisect: use refs infrastructure for BISECT_START

[David Turner <dturner@twopensource.com>]

This ref needs to go through the refs backend, since some code assumes
that it can be written and read as a ref.

Signed-off-by: David Turner <dturner@twopensource.com>
---
 contrib/completion/git-completion.bash | 2 +-
 git-bisect.sh                          | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 93716c4..c4d4d80 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -938,7 +938,7 @@ _git_bisect ()
 	local subcommands="start bad good skip reset visualize replay log run"
 	local subcommand="$(__git_find_on_cmdline "$subcommands")"
 	if [ -z "$subcommand" ]; then
-		if [ -f "$(__gitdir)"/BISECT_START ]; then
+		if [ git rev-parse BISECT_START 2>/dev/null ]; then
 			__gitcomp "$subcommands"
 		else
 			__gitcomp "replay start"
diff --git a/git-bisect.sh b/git-bisect.sh
index ae3fec2..8658772 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -166,7 +166,7 @@ bisect_start() {
 	#
 	echo "$start_head" >"$GIT_DIR/BISECT_START" && {
 		test "z$mode" != "z--no-checkout" ||
-		git update-ref --no-deref BISECT_HEAD "$start_head"
+		git rev-parse "$start_head" > "$GIT_DIR/BISECT_HEAD"
 	} &&
 	git rev-parse --sq-quote "$@" >"$GIT_DIR/BISECT_NAMES" &&
 	eval "$eval true" &&
@@ -399,7 +399,7 @@ bisect_clean_state() {
 	rm -f "$GIT_DIR/BISECT_RUN" &&
 	# Cleanup head-name if it got left by an old version of git-bisect
 	rm -f "$GIT_DIR/head-name" &&
-	git update-ref -d --no-deref BISECT_HEAD &&
+	rm -f "$GIT_DIR/BISECT_HEAD" &&
 	# clean up BISECT_START last
 	rm -f "$GIT_DIR/BISECT_START"
 }
-- 
2.0.4.314.gdbf7a51-twtrsrc