$ git clone -n https://src.fedoraproject.org/rpms/cockpit-ostree.git /var/lib/mock/f40-build-2649944-66871/root/chroot_tmpdir/scmroot/cockpit-ostree
Cloning into '/var/lib/mock/f40-build-2649944-66871/root/chroot_tmpdir/scmroot/cockpit-ostree'...
$ git fetch origin 6e510386ac7c0655f1dbfa5f7760d1fa38b53701:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-ostree
 * [new ref]         6e510386ac7c0655f1dbfa5f7760d1fa38b53701 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e51038 [packit] 201 upstream release