$ git clone -n https://src.fedoraproject.org/rpms/oscillatord.git /var/lib/mock/f39-build-1519551-35818/root/chroot_tmpdir/scmroot/oscillatord
Cloning into '/var/lib/mock/f39-build-1519551-35818/root/chroot_tmpdir/scmroot/oscillatord'...
$ git fetch origin 5189a66d34132c344610ccc4f937711ec079fd85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/oscillatord
 * [new ref]         5189a66d34132c344610ccc4f937711ec079fd85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5189a66 Update to 3.5.6