$ git clone -n https://src.fedoraproject.org/rpms/ephemeral.git /var/lib/mock/f40-build-1330286-23549/root/chroot_tmpdir/scmroot/ephemeral
Cloning into '/var/lib/mock/f40-build-1330286-23549/root/chroot_tmpdir/scmroot/ephemeral'...
$ git fetch origin 7e06162e3de4f504a98ed565bf5462e02a8ae8d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ephemeral
 * [new ref]         7e06162e3de4f504a98ed565bf5462e02a8ae8d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e06162 Abandonware