$ git clone -n https://src.fedoraproject.org/rpms/dummy-test-package-gloster.git /var/lib/mock/f41-build-side-1-2817285-32985/root/chroot_tmpdir/scmroot/dummy-test-package-gloster
Cloning into '/var/lib/mock/f41-build-side-1-2817285-32985/root/chroot_tmpdir/scmroot/dummy-test-package-gloster'...
$ git fetch origin 82228a9c3ea657b8854845bc70441f48e7dbc3e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dummy-test-package-gloster
 * [new ref]           82228a9c3ea657b8854845bc70441f48e7dbc3e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82228a9c Bump release