$ git clone -n https://src.fedoraproject.org/rpms/libxcb.git /var/lib/mock/f40-build-785913-134135/root/chroot_tmpdir/scmroot/libxcb
Cloning into '/var/lib/mock/f40-build-785913-134135/root/chroot_tmpdir/scmroot/libxcb'...
$ git fetch origin c1d3c57c351c8f9d6a9f3d9d41cc99e9e78d00ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxcb
 * [new ref]         c1d3c57c351c8f9d6a9f3d9d41cc99e9e78d00ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1d3c57 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild