$ git clone -n https://src.fedoraproject.org/rpms/cage.git /var/lib/mock/f39-build-1530962-36200/root/chroot_tmpdir/scmroot/cage
Cloning into '/var/lib/mock/f39-build-1530962-36200/root/chroot_tmpdir/scmroot/cage'...
$ git fetch origin 351beaeae915049b8cda5ca53755bbfb3cd297ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cage
 * [new ref]         351beaeae915049b8cda5ca53755bbfb3cd297ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 351beae Update to 0.1.5 (#2227408)