This file is indexed.

/usr/share/ltsp/plugins/ltsp-build-client/Gentoo/001-set-arch is in ltsp-server 5.4.2-6+deb7u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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case "$MODE" in
    commandline)
        add_option "arch" "`eval_gettext "set the target architecture"`" "regular" "true"
        ;;
    configure)
        if [ -n "$option_arch_value" ] || [ -n "$ARCH" ]; then
            ARCH="${option_arch_value:-$ARCH}"
        else
            ARCH=i686
        fi
        
        # determining main arch (needed to retrieve stage file)
        case "${ARCH}" in
            i486|i686)
                MAIN_ARCH=x86
            ;;
            amd64)
                MAIN_ARCH=amd64
            ;;
            *)
            printf "`eval_gettext "ERROR: unsupported architecture. Check your --arch argument: %s"`", $ARCH_OPT
            printf "`eval_gettext "       supported values are: %s"`", "i486, i686, amd64"
            exit 1
            ;;
        esac     
        ;;
    finalization)
        # use to determine client arch later
        mkdir -p "$ROOT/etc/ltsp"
        echo "$ARCH" > "$ROOT/etc/ltsp/arch.conf"
        ;;
esac