$ git clone -n https://src.fedoraproject.org/rpms/arc-kde.git /var/lib/mock/f40-build-2649095-66830/root/chroot_tmpdir/scmroot/arc-kde
Cloning into '/var/lib/mock/f40-build-2649095-66830/root/chroot_tmpdir/scmroot/arc-kde'...
$ git fetch origin f66911f2024482a077386a3e996ba0d1310b52f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arc-kde
 * [new ref]         f66911f2024482a077386a3e996ba0d1310b52f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f66911f Update plasma 6 patch