$ git clone -n https://src.fedoraproject.org/rpms/bluez.git /var/lib/mock/f42-build-side-1-3501048-45971/root/chroot_tmpdir/scmroot/bluez
Cloning into '/var/lib/mock/f42-build-side-1-3501048-45971/root/chroot_tmpdir/scmroot/bluez'...
$ git fetch origin 75f71ee7594cec1ccb9d337cd6f28dcaffc384de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bluez
 * [new ref]         75f71ee7594cec1ccb9d337cd6f28dcaffc384de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75f71ee Upstream patches to fix broken 5.81