$ git clone -n https://src.fedoraproject.org/rpms/SimGear.git /var/lib/mock/f40-build-2084518-50018/root/chroot_tmpdir/scmroot/SimGear
Cloning into '/var/lib/mock/f40-build-2084518-50018/root/chroot_tmpdir/scmroot/SimGear'...
$ git fetch origin d7bd46b05d03f1c572e8a44ba935b0bc5c4b48a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/SimGear
 * [new ref]         d7bd46b05d03f1c572e8a44ba935b0bc5c4b48a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7bd46b new upstream release