$ git clone -n https://src.fedoraproject.org/rpms/extra-enforcer-rules.git /var/lib/mock/f40-build-2054986-49105/root/chroot_tmpdir/scmroot/extra-enforcer-rules
Cloning into '/var/lib/mock/f40-build-2054986-49105/root/chroot_tmpdir/scmroot/extra-enforcer-rules'...
$ git fetch origin 8ff23358c71ca1acec250f8360fe36bc925e71e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/extra-enforcer-rules
 * [new ref]         8ff23358c71ca1acec250f8360fe36bc925e71e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ff2335 Update javapackages test plan to f40