$ git clone -n https://src.fedoraproject.org/rpms/torbrowser-launcher.git /var/lib/mock/f40-build-1380155-23557/root/chroot_tmpdir/scmroot/torbrowser-launcher
Cloning into '/var/lib/mock/f40-build-1380155-23557/root/chroot_tmpdir/scmroot/torbrowser-launcher'...
$ git fetch origin ef271f17a59d2f9e660ec9f83670ecea51537c15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/torbrowser-launcher
 * [new ref]         ef271f17a59d2f9e660ec9f83670ecea51537c15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef271f1 Require dbus-glib