$ git clone -n https://src.fedoraproject.org/rpms/linux-system-roles.git /var/lib/mock/f45-build-17465-499/root/chroot_tmpdir/scmroot/linux-system-roles
Cloning into '/var/lib/mock/f45-build-17465-499/root/chroot_tmpdir/scmroot/linux-system-roles'...
$ git fetch origin 5ed3cff4eb4d468a9d775de1c43c09bc519a8079:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/linux-system-roles
 * [new ref]         5ed3cff4eb4d468a9d775de1c43c09bc519a8079 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ed3cff Update to 2.5.0 upstream release