$ git clone -n https://src.fedoraproject.org/rpms/bluez.git /var/lib/mock/f40-build-1463412-23577/root/chroot_tmpdir/scmroot/bluez
Cloning into '/var/lib/mock/f40-build-1463412-23577/root/chroot_tmpdir/scmroot/bluez'...
$ git fetch origin a55d3d7457e6581ca8cd475c9b8d4d60a194dbee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bluez
 * [new ref]         a55d3d7457e6581ca8cd475c9b8d4d60a194dbee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a55d3d7 Update files list