t3508: add check_head_differs_from() helper function and use it

diff --git a/git-repack.sh b/git-repack.sh
index 0868734723b3c96144bfa9360a9e19ebae1995f7..1eb3bca352f38ec3807383cc5fff7f7e62731b2b 100755 (executable)
--- a/git-repack.sh
+++ b/git-repack.sh
@@ -24,7 +24,7 @@ SUBDIRECTORY_OK='Yes'
 . git-sh-setup
 
 no_update_info= all_into_one= remove_redundant= unpack_unreachable=
-local= quiet= no_reuse= extra=
+local= no_reuse= extra=
 while test $# != 0
 do
        case "$1" in
@@ -33,7 +33,7 @@ do
        -A)     all_into_one=t
                unpack_unreachable=--unpack-unreachable ;;
        -d)     remove_redundant=t ;;
-       -q)     quiet=-q ;;
+       -q)     GIT_QUIET=t ;;
        -f)     no_reuse=--no-reuse-object ;;
        -l)     local=--local ;;
        --max-pack-size|--window|--window-memory|--depth)
@@ -80,13 +80,11 @@ case ",$all_into_one," in
        ;;
 esac
 
-args="$args $local $quiet $no_reuse$extra"
-names=$(git pack-objects --honor-pack-keep --non-empty --all --reflog $args </dev/null "$PACKTMP") ||
+args="$args $local ${GIT_QUIET:+-q} $no_reuse$extra"
+names=$(git pack-objects --keep-true-parents --honor-pack-keep --non-empty --all --reflog $args </dev/null "$PACKTMP") ||
        exit 1
 if [ -z "$names" ]; then
-       if test -z "$quiet"; then
-               echo Nothing new to pack.
-       fi
+       say Nothing new to pack.
 fi
 
 # Ok we have prepared all new packfiles.
@@ -176,7 +174,7 @@ then
                  done
                )
        fi
-       git prune-packed $quiet
+       git prune-packed ${GIT_QUIET:+-q}
 fi
 
 case "$no_update_info" in