[PATCH] bisect reset: Allow resetting to any commit, not just a branch

‘git bisect reset’ could already checkout an arbitrary commit if you
were on a detached HEAD before starting the bisection.  This lets you
specify an arbitrary commit to ‘git bisect reset <commit>’.

This also provides a way to clean the bisection state without moving
HEAD: ‘git bisect reset HEAD’.

Signed-off-by: Anders Kaseorg <redacted>
---
 git-bisect.sh |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/git-bisect.sh b/git-bisect.sh
index 6f6f039..d319b9f 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh

@@ -311,8 +311,7 @@ bisect_reset() {
 	}
 	case "$#" in
 	0) branch=$(cat "$GIT_DIR/BISECT_START") ;;
-	1) git show-ref --verify --quiet -- "refs/heads/$1" ||
-	       die "$1 does not seem to be a valid branch"
+	1) git rev-parse --verify "$1^{commit}" || exit
 	   branch="$1" ;;
 	*)
 	    usage ;;

-- 
1.6.5