$ git clone -n https://src.fedoraproject.org/rpms/kf6-purpose.git /var/lib/mock/f40-build-742394-110734/root/chroot_tmpdir/scmroot/kf6-purpose
Cloning into '/var/lib/mock/f40-build-742394-110734/root/chroot_tmpdir/scmroot/kf6-purpose'...
$ git fetch origin 4b92dfc6ea368d04f088947048cbabff9d97ff5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-purpose
 * [new ref]         4b92dfc6ea368d04f088947048cbabff9d97ff5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b92dfc 5.245.0