$ git clone -n https://src.fedoraproject.org/rpms/alliance.git /var/lib/mock/f40-build-1990550-43410/root/chroot_tmpdir/scmroot/alliance
Cloning into '/var/lib/mock/f40-build-1990550-43410/root/chroot_tmpdir/scmroot/alliance'...
$ git fetch origin a0ed8353c433b869c95ad73aa3ab745c5ce6381c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alliance
 * [new ref]         a0ed8353c433b869c95ad73aa3ab745c5ce6381c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0ed835 Set build_type_safety_c to 0 (#2187002)