$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-atlasrep.git /var/lib/mock/f41-build-side-1-2951820-35498/root/chroot_tmpdir/scmroot/gap-pkg-atlasrep
Cloning into '/var/lib/mock/f41-build-side-1-2951820-35498/root/chroot_tmpdir/scmroot/gap-pkg-atlasrep'...
$ git fetch origin 126ab12b4ad88d8f108c377b99c4039c4e81b46c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-atlasrep
 * [new ref]         126ab12b4ad88d8f108c377b99c4039c4e81b46c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 126ab12 Version 2.1.9