$ git clone -n https://src.fedoraproject.org/rpms/cosmic-idle.git /var/lib/mock/f45-build-4714-333/root/chroot_tmpdir/scmroot/cosmic-idle
Cloning into '/var/lib/mock/f45-build-4714-333/root/chroot_tmpdir/scmroot/cosmic-idle'...
$ git fetch origin dd0d69a5088ba69b8cd72e30d8bc9740a969ecc3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-idle
 * [new ref]         dd0d69a5088ba69b8cd72e30d8bc9740a969ecc3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd0d69a Update to 1.6.0