$ git clone -n https://src.fedoraproject.org/rpms/cockpit-navigator.git /var/lib/mock/f42-build-3403670-45135/root/chroot_tmpdir/scmroot/cockpit-navigator
Cloning into '/var/lib/mock/f42-build-3403670-45135/root/chroot_tmpdir/scmroot/cockpit-navigator'...
$ git fetch origin 257466cb0c134a3a57c66f3a42d542f0ca3a2e0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-navigator
 * [new ref]         257466cb0c134a3a57c66f3a42d542f0ca3a2e0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 257466c Replaced by cockpit-files