$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-drv-nouveau.git /var/lib/mock/f45-build-39008-731/root/chroot_tmpdir/scmroot/xorg-x11-drv-nouveau
Cloning into '/var/lib/mock/f45-build-39008-731/root/chroot_tmpdir/scmroot/xorg-x11-drv-nouveau'...
$ git fetch origin ad8b1cf0ce177068263fa95966c1a81b4030870d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-drv-nouveau
 * [new ref]         ad8b1cf0ce177068263fa95966c1a81b4030870d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad8b1cf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild