Implement automatic fast-forward merge for submodules

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 2ff211cbaa928275857577535f02ae92cb407f2f..6b86abc64bfe0034caf23cf9530955128766de32 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -20,6 +20,7 @@ v,verbose          display a diffstat of what changed upstream
 onto=              rebase onto given branch instead of upstream
 p,preserve-merges  try to recreate merges instead of ignoring them
 s,strategy=        use the given merge strategy
+no-ff              cherry-pick all commits, even if unchanged
 m,merge            always used (no-op)
 i,interactive      always used (no-op)
  Actions:
@@ -110,6 +111,7 @@ VERBOSE=
 OK_TO_SKIP_PRE_REBASE=
 REBASE_ROOT=
 AUTOSQUASH=
+NEVER_FF=
 
 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
 mark the corrected paths with 'git add <paths>', and
@@ -232,6 +234,7 @@ do_with_author () {
 pick_one () {
        ff=--ff
        case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
+       case "$NEVER_FF" in '') ;; ?*) ff= ;; esac
        output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
        test -d "$REWRITTEN" &&
                pick_one_preserving_merges "$@" && return
@@ -562,6 +565,7 @@ do_next () {
                        git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
        } &&
        {
+               test -s "$REWRITTEN_LIST" &&
                git notes copy --for-rewrite=rebase < "$REWRITTEN_LIST" ||
                true # we don't care if this copying failed
        } &&
@@ -782,6 +786,9 @@ first and then run 'git rebase --continue' again."
        -i)
                # yeah, we know
                ;;
+       --no-ff)
+               NEVER_FF=t
+               ;;
        --root)
                REBASE_ROOT=t
                ;;
@@ -965,10 +972,11 @@ EOF
                has_action "$TODO" ||
                        die_abort "Nothing to do"
 
-               test -d "$REWRITTEN" || skip_unnecessary_picks
+               test -d "$REWRITTEN" || test -n "$NEVER_FF" || skip_unnecessary_picks
 
+               output git checkout $ONTO || die_abort "could not detach HEAD"
                git update-ref ORIG_HEAD $HEAD
-               output git checkout $ONTO && do_rest
+               do_rest
                ;;
        esac
        shift