$ git clone -n https://src.fedoraproject.org/rpms/plasma-wallpapers-dynamic.git /var/lib/mock/f40-build-798231-141768/root/chroot_tmpdir/scmroot/plasma-wallpapers-dynamic
Cloning into '/var/lib/mock/f40-build-798231-141768/root/chroot_tmpdir/scmroot/plasma-wallpapers-dynamic'...
$ git fetch origin 8f36c3b9ecb816c4921b359e166330b6ca1641c4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-wallpapers-dynamic
 * [new ref]         8f36c3b9ecb816c4921b359e166330b6ca1641c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f36c3b Rebase to 5.0.0 for Plasma 6