[PATCH] "git fetch --force".

Just like "git push" can forcibly update a ref to a value that is not
a fast-forward, teach "git fetch" to do so as well.

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

diff --git a/git-fetch-script b/git-fetch-script
index a70909e..dc7f4d6 100755 (executable)
--- a/git-fetch-script
+++ b/git-fetch-script
@@ -6,19 +6,32 @@ _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
 
 append=
+force=
+while case "$#" in 0) break ;; esac
+do
+       case "$1" in
+       -a|--a|--ap|--app|--appe|--appen|--append)
+               append=t
+               shift
+               ;;
+       -f|--f|--fo|--for|--forc|--force)
+               force=t
+               shift
+               ;;
+       *)
+               break
+               ;;
+       esac
+done
+
 case "$#" in
 0)
        test -f "$GIT_DIR/branches/origin" ||
                test -f "$GIT_DIR/remotes/origin" ||
                        die "Where do you want to fetch from?"
        set origin ;;
-*)
-       case "$1" in
-       -a|--a|--ap|--app|--appe|--appen|--append)
-               append=t
-               shift ;;
-       esac
 esac
+
 remote_nick="$1"
 remote=$(get_remote_url "$@")
 refs=
@@ -60,7 +73,16 @@ fast_forward_local () {
     refs/tags/*)
        # Tags need not be pointing at commits so there
        # is no way to guarantee "fast-forward" anyway.
+       if test -f "$GIT_DIR/$1"
+       then
+               echo >&2 "* $1: updating with $4"
+               echo >&2 "  from $3."
+       else
+               echo >&2 "* $1: storing $4"
+               echo >&2 "  from $3."
+       fi
        echo "$2" >"$GIT_DIR/$1" ;;
+
     refs/heads/*)
        # NEEDSWORK: use the same cmpxchg protocol here.
        echo "$2" >"$GIT_DIR/$1.lock"
@@ -81,9 +103,16 @@ fast_forward_local () {
                false
                ;;
            esac || {
-               mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
                echo >&2 "* $1: does not fast forward to $4"
-               echo >&2 "  from $3; leaving it in '$1.remote'"
+               case "$force" in
+               t)
+                       echo >&2 "  from $3; forcing update."
+                       ;;
+               *)
+                       mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
+                       echo >&2 "  from $3; leaving it in '$1.remote'"
+                       ;;
+               esac
            }
        else
                echo >&2 "* $1: storing $4"