$ git clone -n https://src.fedoraproject.org/rpms/qbs.git /var/lib/mock/f40-build-2182085-51174/root/chroot_tmpdir/scmroot/qbs
Cloning into '/var/lib/mock/f40-build-2182085-51174/root/chroot_tmpdir/scmroot/qbs'...
$ git fetch origin 30a61500c7b07d32fd49e548f6b5c99f6f30d254:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qbs
 * [new ref]         30a61500c7b07d32fd49e548f6b5c99f6f30d254 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30a6150 Update to 2.2.1