$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-drv-nouveau.git /var/lib/mock/f41-build-874454-16213/root/chroot_tmpdir/scmroot/xorg-x11-drv-nouveau
Cloning into '/var/lib/mock/f41-build-874454-16213/root/chroot_tmpdir/scmroot/xorg-x11-drv-nouveau'...
$ git fetch origin 50b5a30421be9200537e9d657bd12347f4205d0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-drv-nouveau
 * [new ref]         50b5a30421be9200537e9d657bd12347f4205d0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50b5a30 Eliminate use of obsolete %patchN syntax (#2283636)