$ git clone -n https://src.fedoraproject.org/rpms/live555.git /var/lib/mock/f40-build-746075-112353/root/chroot_tmpdir/scmroot/live555
Cloning into '/var/lib/mock/f40-build-746075-112353/root/chroot_tmpdir/scmroot/live555'...
$ git fetch origin 56c02d00f4e3e2b94e3543aacb24fbb872e725a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/live555
 * [new ref]         56c02d00f4e3e2b94e3543aacb24fbb872e725a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56c02d0 Convert to rpmautospec