$ git clone -n https://src.fedoraproject.org/rpms/cockpit.git /var/lib/mock/f42-build-side-1-3582506-46885/root/chroot_tmpdir/scmroot/cockpit
Cloning into '/var/lib/mock/f42-build-side-1-3582506-46885/root/chroot_tmpdir/scmroot/cockpit'...
$ git fetch origin 8b03250ac9013dd7c66805930db8ebd4888c66f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit
 * [new ref]         8b03250ac9013dd7c66805930db8ebd4888c66f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b03250 Update to 341 upstream release