$ git clone -n https://src.fedoraproject.org/rpms/bluez.git /var/lib/mock/f42-build-side-1-3537115-46559/root/chroot_tmpdir/scmroot/bluez
Cloning into '/var/lib/mock/f42-build-side-1-3537115-46559/root/chroot_tmpdir/scmroot/bluez'...
$ git fetch origin f38c617dac3a10987512e5c030fac5ff5a4cf9a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bluez
 * [new ref]         f38c617dac3a10987512e5c030fac5ff5a4cf9a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f38c617 Fix filelist