$ git clone -n https://src.fedoraproject.org/rpms/kf6-karchive.git /var/lib/mock/f42-build-side-1-3502573-45978/root/chroot_tmpdir/scmroot/kf6-karchive
Cloning into '/var/lib/mock/f42-build-side-1-3502573-45978/root/chroot_tmpdir/scmroot/kf6-karchive'...
$ git fetch origin 30e3c79781fcdae2b9e65e2e064ee45934f956a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-karchive
 * [new ref]         30e3c79781fcdae2b9e65e2e064ee45934f956a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30e3c79 6.13.0