bisect: improve error message when branch checkout fails

In "git-bisect.sh" the "git checkout" command is only used to
change the current branch, but it is used like this:

git checkout "$branch"

which will output the following misleading error message when
it fails:

error: pathspec 'foo' did not match any file(s) known to git.

This patch change the way we use "git checkout" like this:

git checkout "$branch" --

so that we will get the following error message:

fatal: invalid reference: foo

which is better.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-bisect.sh b/git-bisect.sh
index e313bdea70d0a765106aa42a17a66f01d3d0f7d8..df0ae63b4e40f9aa7373269e9a7fb7eeeb66cd18 100755 (executable)
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -77,7 +77,7 @@ bisect_start() {
        then
                # Reset to the rev from where we started.
                start_head=$(cat "$GIT_DIR/BISECT_START")
-               git checkout "$start_head" || exit
+               git checkout "$start_head" -- || exit
        else
                # Get rev from where we start.
                case "$head" in
@@ -370,7 +370,7 @@ bisect_checkout() {
        _msg="$2"
        echo "Bisecting: $_msg"
        mark_expected_rev "$_rev"
-       git checkout -q "$_rev" || exit
+       git checkout -q "$_rev" -- || exit
        git show-branch "$_rev"
 }
 
@@ -549,7 +549,7 @@ bisect_reset() {
        *)
            usage ;;
        esac
-       git checkout "$branch" && bisect_clean_state
+       git checkout "$branch" -- && bisect_clean_state
 }
 
 bisect_clean_state() {