$ git clone -n https://src.fedoraproject.org/rpms/speedtest.git /var/lib/mock/f39-build-1586734-38209/root/chroot_tmpdir/scmroot/speedtest
Cloning into '/var/lib/mock/f39-build-1586734-38209/root/chroot_tmpdir/scmroot/speedtest'...
$ git fetch origin 392ea7b5df97a12dcbb2f4901c8c5d963b515e2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/speedtest
 * [new ref]         392ea7b5df97a12dcbb2f4901c8c5d963b515e2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 392ea7b Initial