$ git clone -n https://src.fedoraproject.org/rpms/libavif.git /var/lib/mock/f45-build-15870-480/root/chroot_tmpdir/scmroot/libavif
Cloning into '/var/lib/mock/f45-build-15870-480/root/chroot_tmpdir/scmroot/libavif'...
$ git fetch origin 5971d2b8b5b8baa59fe7c3fa52313370663258b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libavif
 * [new ref]         5971d2b8b5b8baa59fe7c3fa52313370663258b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5971d2b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild