git subtree merge --prefix=subdir FETCH_HEAD
git branch pre-split
-split1=$(git subtree split --annotate='*' --prefix subdir --onto FETCH_HEAD --rejoin)
+split1=$(git subtree split --annotate='*' \
+ --prefix subdir --onto FETCH_HEAD --rejoin)
echo "split1={$split1}"
git branch split1 "$split1"
allchanges=$(git log --name-only --pretty=format:'' | sort | fixnl)
check_equal "$allchanges" "$chkm $chkms $chks $chkms_sub"
+echo
+echo 'ok'