$ git clone -n https://src.fedoraproject.org/rpms/simple-scan.git /var/lib/mock/f40-build-804946-144647/root/chroot_tmpdir/scmroot/simple-scan
Cloning into '/var/lib/mock/f40-build-804946-144647/root/chroot_tmpdir/scmroot/simple-scan'...
$ git fetch origin dfd02ef0a27bfc556e65f2a28313af7bb99b0456:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/simple-scan
 * [new ref]         dfd02ef0a27bfc556e65f2a28313af7bb99b0456 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfd02ef Update to 46.0