$ git clone -n https://src.fedoraproject.org/rpms/erlang-proper.git /var/lib/mock/f41-build-1102259-20038/root/chroot_tmpdir/scmroot/erlang-proper
Cloning into '/var/lib/mock/f41-build-1102259-20038/root/chroot_tmpdir/scmroot/erlang-proper'...
$ git fetch origin 139af38cb14f355091c4574ef6075d055449c2c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-proper
 * [new ref]         139af38cb14f355091c4574ef6075d055449c2c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 139af38 Switch to SPDX tag