$ git clone -n https://src.fedoraproject.org/rpms/erlang-ranch.git /var/lib/mock/f41-build-side-1-2893055-34611/root/chroot_tmpdir/scmroot/erlang-ranch
Cloning into '/var/lib/mock/f41-build-side-1-2893055-34611/root/chroot_tmpdir/scmroot/erlang-ranch'...
$ git fetch origin ce55411df0f333516f745d89d9172cfdd62d2ff5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-ranch
 * [new ref]         ce55411df0f333516f745d89d9172cfdd62d2ff5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce55411 Spec-file cleanup