$ git clone -n https://src.fedoraproject.org/rpms/xcb-util.git /var/lib/mock/f45-build-38634-726/root/chroot_tmpdir/scmroot/xcb-util
Cloning into '/var/lib/mock/f45-build-38634-726/root/chroot_tmpdir/scmroot/xcb-util'...
$ git fetch origin 0f1b53bfec87a0cdfbd73d25a41acd30ad100b38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xcb-util
 * [new ref]         0f1b53bfec87a0cdfbd73d25a41acd30ad100b38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f1b53b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild