git-branch: -f to forcibly reset branch head.

A new usage, 'git-branch -f branch [start]', resets the branch head at
start (or current head).  Should be considered a dangerous operation,
but if you are like me to keep rewinding branches it is handy.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-branch.sh b/git-branch.sh
index 11d52fd..2594518 100755 (executable)
--- a/git-branch.sh
+++ b/git-branch.sh
@@ -3,7 +3,7 @@
 . git-sh-setup || die "Not a git archive"
 
 usage () {
-    echo >&2 "usage: $(basename $0)"' [-d <branch>] | [<branch> [start-point]]
+    echo >&2 "usage: $(basename $0)"' [-d <branch>] | [[-f] <branch> [start-point]]
 
 If no arguments, show available branches and mark current branch with a star.
 If one argument, create a new branch <branchname> based off of current HEAD.
@@ -12,11 +12,12 @@ If two arguments, create a new branch <branchname> based off of <start-point>.
     exit 1
 }
 
+headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
+       sed -e 's|^refs/heads/||')
+
 delete_branch () {
     option="$1"
     shift
-    headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
-              sed -e 's|^refs/heads/||')
     for branch_name
     do
        case ",$headref," in
@@ -52,6 +53,7 @@ delete_branch () {
     exit 0
 }
 
+force=
 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
 do
        case "$1" in
@@ -59,6 +61,9 @@ do
                delete_branch "$@"
                exit
                ;;
+       -f)
+               force="$1"
+               ;;
        --)
                shift
                break
@@ -72,8 +77,6 @@ done
 
 case "$#" in
 0)
-       headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
-                 sed -e 's|^refs/heads/||')
        git-rev-parse --symbolic --all |
        sed -ne 's|^refs/heads/||p' |
        sort |
@@ -97,10 +100,18 @@ branchname="$1"
 
 rev=$(git-rev-parse --verify "$head") || exit
 
-[ -e "$GIT_DIR/refs/heads/$branchname" ] &&
-       die "$branchname already exists."
 git-check-ref-format "heads/$branchname" ||
        die "we do not like '$branchname' as a branch name."
 
+if [ -e "$GIT_DIR/refs/heads/$branchname" ]
+then
+       if test '' = "$force"
+       then
+               die "$branchname already exists."
+       elif test "$branchname" = "$headref"
+       then
+               die "cannot force-update the current branch."
+       fi
+fi
 git update-ref "refs/heads/$branchname" $rev