setup: rework setup_explicit_git_dir()

diff --git a/git-rebase.sh b/git-rebase.sh
index 7508463b30e7d1659ac9423a19d195e494600bd3..e5df23bb8350d6d155bdf1ac9a5be4c9fdc29326 100755 (executable)
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -111,7 +111,7 @@ call_merge () {
        export GITHEAD_$cmt GITHEAD_$hd
        if test -n "$GIT_QUIET"
        then
-               export GIT_MERGE_VERBOSITY=1
+               GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
        fi
        eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
        rv=$?
@@ -566,6 +566,7 @@ fi
 if test -z "$do_merge"
 then
        git format-patch -k --stdout --full-index --ignore-if-in-upstream \
+               --src-prefix=a/ --dst-prefix=b/ \
                --no-renames $root_flag "$revisions" |
        git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
        move_to_original_branch