$ git clone -n https://src.fedoraproject.org/rpms/fedpkg.git /var/lib/mock/f42-build-side-1-3583170-46888/root/chroot_tmpdir/scmroot/fedpkg
Cloning into '/var/lib/mock/f42-build-side-1-3583170-46888/root/chroot_tmpdir/scmroot/fedpkg'...
$ git fetch origin 6695a1860ab4cf633695e0613ee3c234a6f08551:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedpkg
 * [new ref]         6695a1860ab4cf633695e0613ee3c234a6f08551 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6695a18 Unify the hatchling macros with rpkg