$ git clone -n https://src.fedoraproject.org/rpms/mailnag.git /var/lib/mock/f41-build-side-2-python-2708461-30473/root/chroot_tmpdir/scmroot/mailnag
Cloning into '/var/lib/mock/f41-build-side-2-python-2708461-30473/root/chroot_tmpdir/scmroot/mailnag'...
$ git fetch origin 60c6a5d5099058137ee25c13fede7b137820cef5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mailnag
 * [new ref]         60c6a5d5099058137ee25c13fede7b137820cef5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60c6a5d convert GPLv2 license to SPDX