$ git clone -n https://src.fedoraproject.org/rpms/eglexternalplatform.git /var/lib/mock/f40-build-2196341-51567/root/chroot_tmpdir/scmroot/eglexternalplatform
Cloning into '/var/lib/mock/f40-build-2196341-51567/root/chroot_tmpdir/scmroot/eglexternalplatform'...
$ git fetch origin 137fc2d2492235054dcab88201d14ae11c2afb01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/eglexternalplatform
 * [new ref]         137fc2d2492235054dcab88201d14ae11c2afb01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 137fc2d Fix changelog