$ git clone -n https://src.fedoraproject.org/rpms/xmobar.git /var/lib/mock/f38-build-715935-95717/root/chroot_tmpdir/scmroot/xmobar
Cloning into '/var/lib/mock/f38-build-715935-95717/root/chroot_tmpdir/scmroot/xmobar'...
$ git fetch origin 23900ab63e53fe3dfa95f19a612913dd8457f977:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmobar
 * [new ref]         23900ab63e53fe3dfa95f19a612913dd8457f977 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23900ab update to 0.46