# HG changeset patch
# User ellis <ellis@rwest.io>
# Date 1686097268 14400
# Node ID 242002f9f0984cc88014bcf4a7db17ca2eae0fa7
# Parent  529419ac94f3fb3e56f221f13f8d885a2057b6cc
deps

diff -r 529419ac94f3 -r 242002f9f098 tools/dep.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/dep.sh	Tue Jun 06 20:21:08 2023 -0400
@@ -0,0 +1,592 @@
+#!/usr/bin/sh
+# install demo build dependencies
+set -u
+PKG_URL_ROOT="${PKG_URL_ROOT:-https://rwest.io/otom8/packy/bundle}"
+PKG_NAME="demo_build_deps"
+check_proc() {
+    # Check for /proc by looking for the /proc/self/exe link
+    # This only run on Linux
+    if ! test -L /proc/self/exe ; then
+        err "fatal: Unable to find /proc/self/exe.  Is /proc mounted?"
+    fi
+}
+
+get_bitness() {
+    need_cmd head
+    # Architecture detection without dependencies beyond coreutils.
+    # ELF files start out "\x7fELF", and the following byte is
+    #   0x01 for 32-bit and
+    #   0x02 for 64-bit.
+    # The printf builtin on some shells like dash only supports octal
+    # escape sequences, so we use those.
+    local _current_exe_head
+    _current_exe_head=$(head -c 5 /proc/self/exe )
+    if [ "$_current_exe_head" = "$(printf '\177ELF\001')" ]; then
+        echo 32
+    elif [ "$_current_exe_head" = "$(printf '\177ELF\002')" ]; then
+        echo 64
+    else
+        err "unknown platform bitness"
+    fi
+}
+
+is_host_amd64_elf() {
+    need_cmd head
+    need_cmd tail
+    # ELF e_machine detection without dependencies beyond coreutils.
+    # Two-byte field at offset 0x12 indicates the CPU,
+    # but we're interested in it being 0x3E to indicate amd64, or not that.
+    local _current_exe_machine
+    _current_exe_machine=$(head -c 19 /proc/self/exe | tail -c 1)
+    [ "$_current_exe_machine" = "$(printf '\076')" ]
+}
+
+get_endianness() {
+    local cputype=$1
+    local suffix_eb=$2
+    local suffix_el=$3
+
+    # detect endianness without od/hexdump, like get_bitness() does.
+    need_cmd head
+    need_cmd tail
+
+    local _current_exe_endianness
+    _current_exe_endianness="$(head -c 6 /proc/self/exe | tail -c 1)"
+    if [ "$_current_exe_endianness" = "$(printf '\001')" ]; then
+        echo "${cputype}${suffix_el}"
+    elif [ "$_current_exe_endianness" = "$(printf '\002')" ]; then
+        echo "${cputype}${suffix_eb}"
+    else
+        err "unknown platform endianness"
+    fi
+}
+
+get_architecture() {
+    local _ostype _cputype _bitness _arch _clibtype
+    _ostype="$(uname -s)"
+    _cputype="$(uname -m)"
+    _clibtype="gnu"
+
+    if [ "$_ostype" = Linux ]; then
+        if [ "$(uname -o)" = Android ]; then
+            _ostype=Android
+        fi
+        if ldd --version 2>&1 | grep -q 'musl'; then
+            _clibtype="musl"
+        fi
+    fi
+
+    if [ "$_ostype" = Darwin ] && [ "$_cputype" = i386 ]; then
+        # Darwin `uname -m` lies
+        if sysctl hw.optional.x86_64 | grep -q ': 1'; then
+            _cputype=x86_64
+        fi
+    fi
+
+    if [ "$_ostype" = SunOS ]; then
+        # Both Solaris and illumos presently announce as "SunOS" in "uname -s"
+        # so use "uname -o" to disambiguate.  We use the full path to the
+        # system uname in case the user has coreutils uname first in PATH,
+        # which has historically sometimes printed the wrong value here.
+        if [ "$(/usr/bin/uname -o)" = illumos ]; then
+            _ostype=illumos
+        fi
+
+        # illumos systems have multi-arch userlands, and "uname -m" reports the
+        # machine hardware name; e.g., "i86pc" on both 32- and 64-bit x86
+        # systems.  Check for the native (widest) instruction set on the
+        # running kernel:
+        if [ "$_cputype" = i86pc ]; then
+            _cputype="$(isainfo -n)"
+        fi
+    fi
+
+    case "$_ostype" in
+
+        Android)
+            _ostype=linux-android
+            ;;
+
+        Linux)
+            check_proc
+            _ostype=unknown-linux-$_clibtype
+            _bitness=$(get_bitness)
+            ;;
+
+        FreeBSD)
+            _ostype=unknown-freebsd
+            ;;
+
+        NetBSD)
+            _ostype=unknown-netbsd
+            ;;
+
+        DragonFly)
+            _ostype=unknown-dragonfly
+            ;;
+
+        Darwin)
+            _ostype=apple-darwin
+            ;;
+
+        illumos)
+            _ostype=unknown-illumos
+            ;;
+
+        MINGW* | MSYS* | CYGWIN*)
+            _ostype=pc-windows-gnu
+            ;;
+
+        *)
+            err "unrecognized OS type: $_ostype"
+            ;;
+
+    esac
+
+    case "$_cputype" in
+
+        i386 | i486 | i686 | i786 | x86)
+            _cputype=i686
+            ;;
+
+        xscale | arm)
+            _cputype=arm
+            if [ "$_ostype" = "linux-android" ]; then
+                _ostype=linux-androideabi
+            fi
+            ;;
+
+        armv6l)
+            _cputype=arm
+            if [ "$_ostype" = "linux-android" ]; then
+                _ostype=linux-androideabi
+            else
+                _ostype="${_ostype}eabihf"
+            fi
+            ;;
+
+        armv7l | armv8l)
+            _cputype=armv7
+            if [ "$_ostype" = "linux-android" ]; then
+                _ostype=linux-androideabi
+            else
+                _ostype="${_ostype}eabihf"
+            fi
+            ;;
+
+        aarch64 | arm64)
+            _cputype=aarch64
+            ;;
+
+        x86_64 | x86-64 | x64 | amd64)
+            _cputype=x86_64
+            ;;
+
+        mips)
+            _cputype=$(get_endianness mips '' el)
+            ;;
+
+        mips64)
+            if [ "$_bitness" -eq 64 ]; then
+                # only n64 ABI is supported for now
+                _ostype="${_ostype}abi64"
+                _cputype=$(get_endianness mips64 '' el)
+            fi
+            ;;
+
+        ppc)
+            _cputype=powerpc
+            ;;
+
+        ppc64)
+            _cputype=powerpc64
+            ;;
+
+        ppc64le)
+            _cputype=powerpc64le
+            ;;
+
+        s390x)
+            _cputype=s390x
+            ;;
+        riscv64)
+            _cputype=riscv64gc
+            ;;
+        *)
+            err "unknown CPU type: $_cputype"
+
+    esac
+
+    # Detect 64-bit linux with 32-bit userland
+    if [ "${_ostype}" = unknown-linux-gnu ] && [ "${_bitness}" -eq 32 ]; then
+        case $_cputype in
+            x86_64)
+                if [ -n "${BABEL_CPUTYPE:-}" ]; then
+                    _cputype="$BABEL_CPUTYPE"
+                else {
+                    # 32-bit executable for amd64 = x32
+                    if is_host_amd64_elf; then {
+                         echo "This host is running an x32 userland; as it stands, x32 support is poor," 1>&2
+                         echo "and there isn't a native toolchain -- you will have to install" 1>&2
+                         echo "multiarch compatibility with i686 and/or amd64, then select one" 1>&2
+                         echo "by re-running this script with the BABEL_CPUTYPE environment variable" 1>&2
+                         echo "set to i686 or x86_64, respectively." 1>&2
+                         echo 1>&2
+                         exit 1
+                    }; else
+                        _cputype=i686
+                    fi
+                }; fi
+                ;;
+            mips64)
+                _cputype=$(get_endianness mips '' el)
+                ;;
+            powerpc64)
+                _cputype=powerpc
+                ;;
+            aarch64)
+                _cputype=armv7
+                if [ "$_ostype" = "linux-android" ]; then
+                    _ostype=linux-androideabi
+                else
+                    _ostype="${_ostype}eabihf"
+                fi
+                ;;
+            riscv64gc)
+                err "riscv64 with 32-bit userland unsupported"
+                ;;
+        esac
+    fi
+
+    # Detect armv7 but without the CPU features Rust needs in that build,
+    # and fall back to arm.
+    # See https://github.com/rust-lang/rustup.rs/issues/587.
+    if [ "$_ostype" = "unknown-linux-gnueabihf" ] && [ "$_cputype" = armv7 ]; then
+        if ensure grep '^Features' /proc/cpuinfo | grep -q -v neon; then
+            # At least one processor does not have NEON.
+            _cputype=arm
+        fi
+    fi
+
+    _arch="${_cputype}-${_ostype}"
+
+    RETVAL="$_arch"
+}
+say() {
+    printf 'dep.sh: %s\n' "$1"
+}
+err() {
+    say "$1" >&2; exit 1
+}
+need_cmd() {
+    if ! check_cmd "$1"; then
+        err "need '$1' (command not found)"
+    fi
+}
+check_cmd() {
+    command -v "$1" > /dev/null 2>&1
+}
+assert_nz() {
+    if [ -z "$1" ]; then err "assert_nz $2"; fi
+}
+ensure() {
+    if ! "$@"; then err "command failed: $*"; fi
+}
+ignore() {
+    "$@"
+}
+main () {
+    need_cmd chmod
+    need_cmd mkdir
+    need_cmd rm
+
+    get_architecture || return 1
+    local _arch="$RETVAL"
+    assert_nz "$_arch" "arch"
+
+    # no extension unless on windows
+    local _ext=""
+    case "$_arch" in
+        *windows*)
+            _ext=".exe"
+            ;;
+    esac
+
+  local _url="${PKG_URL_ROOT}/bin/dist/${_arch}/${PKG_NAME}${_ext}"
+
+    local _dir
+    _dir="$(ensure mktemp -d)"
+    local _file="${_dir}/${PKG_NAME}${_ext}"
+
+    local _ansi_escapes_are_valid=false
+    if [ -t 2 ]; then
+        if [ "${TERM+set}" = 'set' ]; then
+            case "$TERM" in
+                xterm*|rxvt*|urxvt*|linux*|vt*)
+                    _ansi_escapes_are_valid=true
+                ;;
+            esac
+        fi
+    fi
+
+    # check if we have to use /dev/tty to prompt the user
+    local need_tty=yes
+    for arg in "$@"; do
+        case "$arg" in
+            q)
+                # user wants to skip the prompt --
+                # we don't need /dev/tty
+                need_tty=no
+                ;;
+            *)
+                ;;
+        esac
+    done
+
+    if $_ansi_escapes_are_valid; then
+        printf "\33[1minfo:\33[0m downloading $PKG_NAME\n" 1>&2
+    else
+        printf '%s\n' 'info: downloading $PKG_NAME' 1>&2
+    fi
+
+    ensure mkdir -p "$_dir"
+    ensure dl "$_url" "$_file" "$_arch"
+    ensure chmod u+x "$_file"
+    if [ ! -x "$_file" ]; then
+        printf '%s\n' "Cannot execute $_file (likely because of mounting /tmp as noexec)." 1>&2
+        printf '%s\n' "Please copy the file to a location where you can execute binaries and run ./${PKG_NAME}${_ext}." 1>&2
+        exit 1
+    fi
+
+    if [ "$need_tty" = "yes" ]; then
+        # The installer is going to want to ask for confirmation by
+        # reading stdin.  This script was piped into `sh` though and
+        # doesn't have stdin to pass to its children. Instead we're going
+        # to explicitly connect /dev/tty to the installer's stdin.
+        if [ ! -t 1 ]; then
+            err "Unable to run interactively. Run with -y to accept defaults"
+        fi
+
+        ignore "$_file" "$@" < /dev/tty
+    else
+        ignore "$_file" "$@"
+    fi
+
+    local _retval=$?
+
+    ignore rm "$_file"
+    ignore rmdir "$_dir"
+
+    return "$_retval"
+}
+
+dl() { # curl || wget
+    local _dld
+    local _ciphersuites
+    local _err
+    local _status
+    if check_cmd curl; then
+        _dld=curl
+    elif check_cmd wget; then
+        _dld=wget
+    else
+        _dld='curl or wget' # to be used in error message of need_cmd
+    fi
+
+    if [ "$1" = --check ]; then
+        need_cmd "$_dld"
+    elif [ "$_dld" = curl ]; then
+        get_ciphersuites_for_curl
+        _ciphersuites="$RETVAL"
+        if [ -n "$_ciphersuites" ]; then
+            _err=$(curl --proto '=https' --tlsv1.2 --ciphers "$_ciphersuites" --silent --show-error --fail --location "$1" --output "$2" 2>&1)
+            _status=$?
+        else
+            echo "Warning: Not enforcing strong cipher suites for TLS, this is potentially less secure"
+            if ! check_help_for "$3" curl --proto --tlsv1.2; then
+                echo "Warning: Not enforcing TLS v1.2, this is potentially less secure"
+                _err=$(curl --silent --show-error --fail --location "$1" --output "$2" 2>&1)
+                _status=$?
+            else
+                _err=$(curl --proto '=https' --tlsv1.2 --silent --show-error --fail --location "$1" --output "$2" 2>&1)
+                _status=$?
+            fi
+        fi
+        if [ -n "$_err" ]; then
+            echo "$_err" >&2
+            if echo "$_err" | grep -q 404$; then
+                err "installer for platform '$3' not found 8^C - ask ellis to support your platform"
+            fi
+        fi
+        return $_status
+    elif [ "$_dld" = wget ]; then
+        get_ciphersuites_for_wget
+        _ciphersuites="$RETVAL"
+        if [ -n "$_ciphersuites" ]; then
+            _err=$(wget --https-only --secure-protocol=TLSv1_2 --ciphers "$_ciphersuites" "$1" -O "$2" 2>&1)
+            _status=$?
+        else
+            echo "Warning: Not enforcing strong cipher suites for TLS, this is potentially less secure"
+            if ! check_help_for "$3" wget --https-only --secure-protocol; then
+                echo "Warning: Not enforcing TLS v1.2, this is potentially less secure"
+                _err=$(wget "$1" -O "$2" 2>&1)
+                _status=$?
+            else
+                _err=$(wget --https-only --secure-protocol=TLSv1_2 "$1" -O "$2" 2>&1)
+                _status=$?
+            fi
+        fi
+        if [ -n "$_err" ]; then
+            echo "$_err" >&2
+            if echo "$_err" | grep -q ' 404 Not Found$'; then
+                err "installer for platform '$3' not found!"
+            fi
+        fi
+        return $_status
+    else
+        err "Unknown dl program"   # should not reach here
+    fi
+}
+
+check_help_for() {
+    local _arch
+    local _cmd
+    local _arg
+    _arch="$1"
+    shift
+    _cmd="$1"
+    shift
+
+    local _category
+    if "$_cmd" --help | grep -q 'For all options use the manual or "--help all".'; then
+      _category="all"
+    else
+      _category=""
+    fi
+
+    case "$_arch" in
+
+        *darwin*)
+        if check_cmd sw_vers; then
+            case $(sw_vers -productVersion) in
+                10.*)
+                    # If we're running on macOS, older than 10.13, then we always
+                    # fail to find these options to force fallback
+                    if [ "$(sw_vers -productVersion | cut -d. -f2)" -lt 13 ]; then
+                        # Older than 10.13
+                        echo "Warning: Detected macOS platform older than 10.13"
+                        return 1
+                    fi
+                    ;;
+                11.*)
+                    # We assume Big Sur will be OK for now
+                    ;;
+                *)
+                    # Unknown product version, warn and continue
+                    echo "Warning: Detected unknown macOS major version: $(sw_vers -productVersion)"
+                    echo "Warning TLS capabilities detection may fail"
+                    ;;
+            esac
+        fi
+        ;;
+
+    esac
+
+    for _arg in "$@"; do
+        if ! "$_cmd" --help $_category | grep -q -- "$_arg"; then
+            return 1
+        fi
+    done
+
+    true # not strictly needed
+}
+
+# Return cipher suite string specified by user, otherwise return strong TLS 1.2-1.3 cipher suites
+# if support by local tools is detected. Detection currently supports these curl backends: 
+# GnuTLS and OpenSSL (possibly also LibreSSL and BoringSSL). Return value can be empty.
+get_ciphersuites_for_curl() {
+    if [ -n "${BABEL_TLS_CIPHERSUITES-}" ]; then
+        # user specified custom cipher suites, assume they know what they're doing
+        RETVAL="$BABEL_TLS_CIPHERSUITES"
+        return
+    fi
+
+    local _openssl_syntax="no"
+    local _gnutls_syntax="no"
+    local _backend_supported="yes"
+    if curl -V | grep -q ' OpenSSL/'; then
+        _openssl_syntax="yes"
+    elif curl -V | grep -iq ' LibreSSL/'; then
+        _openssl_syntax="yes"
+    elif curl -V | grep -iq ' BoringSSL/'; then
+        _openssl_syntax="yes"
+    elif curl -V | grep -iq ' GnuTLS/'; then
+        _gnutls_syntax="yes"
+    else
+        _backend_supported="no"
+    fi
+
+    local _args_supported="no"
+    if [ "$_backend_supported" = "yes" ]; then
+        # "unspecified" is for arch, allows for possibility old OS using macports, homebrew, etc.
+        if check_help_for "notspecified" "curl" "--tlsv1.2" "--ciphers" "--proto"; then
+            _args_supported="yes"
+        fi
+    fi
+
+    local _cs=""
+    if [ "$_args_supported" = "yes" ]; then
+        if [ "$_openssl_syntax" = "yes" ]; then
+            _cs=$(get_strong_ciphersuites_for "openssl")
+        elif [ "$_gnutls_syntax" = "yes" ]; then
+            _cs=$(get_strong_ciphersuites_for "gnutls")
+        fi
+    fi
+
+    RETVAL="$_cs"
+}
+
+# Return cipher suite string specified by user, otherwise return strong TLS 1.2-1.3 cipher suites
+# if support by local tools is detected. Detection currently supports these wget backends: 
+# GnuTLS and OpenSSL (possibly also LibreSSL and BoringSSL). Return value can be empty.
+get_ciphersuites_for_wget() {
+    if [ -n "${BABEL_TLS_CIPHERSUITES-}" ]; then
+        # user specified custom cipher suites, assume they know what they're doing
+        RETVAL="$BABEL_TLS_CIPHERSUITES"
+        return
+    fi
+
+    local _cs=""
+    if wget -V | grep -q '\-DHAVE_LIBSSL'; then
+        # "unspecified" is for arch, allows for possibility old OS using macports, homebrew, etc.
+        if check_help_for "notspecified" "wget" "TLSv1_2" "--ciphers" "--https-only" "--secure-protocol"; then
+            _cs=$(get_strong_ciphersuites_for "openssl")
+        fi
+    elif wget -V | grep -q '\-DHAVE_LIBGNUTLS'; then
+        # "unspecified" is for arch, allows for possibility old OS using macports, homebrew, etc.
+        if check_help_for "notspecified" "wget" "TLSv1_2" "--ciphers" "--https-only" "--secure-protocol"; then
+            _cs=$(get_strong_ciphersuites_for "gnutls")
+        fi
+    fi
+
+    RETVAL="$_cs"
+}
+
+# Return strong TLS 1.2-1.3 cipher suites in OpenSSL or GnuTLS syntax. TLS 1.2 
+# excludes non-ECDHE and non-AEAD cipher suites. DHE is excluded due to bad 
+# DH params often found on servers (see RFC 7919). Sequence matches or is
+# similar to Firefox 68 ESR with weak cipher suites disabled via about:config.  
+# $1 must be openssl or gnutls.
+get_strong_ciphersuites_for() {
+    if [ "$1" = "openssl" ]; then
+        # OpenSSL is forgiving of unknown values, no problems with TLS 1.3 values on versions that don't support it yet.
+        echo "TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384"
+    elif [ "$1" = "gnutls" ]; then
+        # GnuTLS isn't forgiving of unknown values, so this may require a GnuTLS version that supports TLS 1.3 even if wget doesn't.
+        # Begin with SECURE128 (and higher) then remove/add to build cipher suites. Produces same 9 cipher suites as OpenSSL but in slightly different order.
+        echo "SECURE128:-VERS-SSL3.0:-VERS-TLS1.0:-VERS-TLS1.1:-VERS-DTLS-ALL:-CIPHER-ALL:-MAC-ALL:-KX-ALL:+AEAD:+ECDHE-ECDSA:+ECDHE-RSA:+AES-128-GCM:+CHACHA20-POLY1305:+AES-256-GCM"
+    fi 
+}
+
+main "$@" || exit 1
+
diff -r 529419ac94f3 -r 242002f9f098 tools/deps.sh
--- a/tools/deps.sh	Tue Jun 06 18:55:17 2023 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,309 +0,0 @@
-#!/usr/bin/sh
-# install demo build dependencies
-set -u
-PKG_URL_ROOT="${PKG_URL_ROOT:-https://rwest.io/otom8/packy/bundle}"
-PKG_NAME="demo_build_deps"
-say() {printf 'babel-installer: %s\n' "$1"}
-err() {say "$1" >&2; exit 1}
-need_cmd() {
-    if ! check_cmd "$1"; then
-        err "need '$1' (command not found)"
-    fi}
-check_cmd() {command -v "$1" > /dev/null 2>&1}
-ensure() {if ! "$@"; then err "command failed: $*"; fi}
-ignore() {"$@"}
-
-main () {
-    need_cmd chmod
-    need_cmd mkdir
-    need_cmd rm
-
-    get_architecture || return 1
-    local _arch="$RETVAL"
-    assert_nz "$_arch" "arch"
-
-    # no extension unless on windows
-    local _ext=""
-    case "$_arch" in
-        *windows*)
-            _ext=".exe"
-            ;;
-    esac
-
-  local _url="${PKG_URL_ROOT}/bin/dist/${_arch}/${PKG_NAME}${_ext}"
-
-    local _dir
-    _dir="$(ensure mktemp -d)"
-    local _file="${_dir}/${PKG_NAME}${_ext}"
-
-    local _ansi_escapes_are_valid=false
-    if [ -t 2 ]; then
-        if [ "${TERM+set}" = 'set' ]; then
-            case "$TERM" in
-                xterm*|rxvt*|urxvt*|linux*|vt*)
-                    _ansi_escapes_are_valid=true
-                ;;
-            esac
-        fi
-    fi
-
-    # check if we have to use /dev/tty to prompt the user
-    local need_tty=yes
-    for arg in "$@"; do
-        case "$arg" in
-            q)
-                # user wants to skip the prompt --
-                # we don't need /dev/tty
-                need_tty=no
-                ;;
-            *)
-                ;;
-        esac
-    done
-
-    if $_ansi_escapes_are_valid; then
-        printf "\33[1minfo:\33[0m downloading $PKG_NAME\n" 1>&2
-    else
-        printf '%s\n' 'info: downloading $PKG_NAME' 1>&2
-    fi
-
-    ensure mkdir -p "$_dir"
-    ensure downloader "$_url" "$_file" "$_arch"
-    ensure chmod u+x "$_file"
-    if [ ! -x "$_file" ]; then
-        printf '%s\n' "Cannot execute $_file (likely because of mounting /tmp as noexec)." 1>&2
-        printf '%s\n' "Please copy the file to a location where you can execute binaries and run ./${PKG_NAME}${_ext}." 1>&2
-        exit 1
-    fi
-
-    if [ "$need_tty" = "yes" ]; then
-        # The installer is going to want to ask for confirmation by
-        # reading stdin.  This script was piped into `sh` though and
-        # doesn't have stdin to pass to its children. Instead we're going
-        # to explicitly connect /dev/tty to the installer's stdin.
-        if [ ! -t 1 ]; then
-            err "Unable to run interactively. Run with -y to accept defaults"
-        fi
-
-        ignore "$_file" "$@" < /dev/tty
-    else
-        ignore "$_file" "$@"
-    fi
-
-    local _retval=$?
-
-    ignore rm "$_file"
-    ignore rmdir "$_dir"
-
-    return "$_retval"
-}
-
-dl() { # curl || wget
-    local _dld
-    local _ciphersuites
-    local _err
-    local _status
-    if check_cmd curl; then
-        _dld=curl
-    elif check_cmd wget; then
-        _dld=wget
-    else
-        _dld='curl or wget' # to be used in error message of need_cmd
-    fi
-
-    if [ "$1" = --check ]; then
-        need_cmd "$_dld"
-    elif [ "$_dld" = curl ]; then
-        get_ciphersuites_for_curl
-        _ciphersuites="$RETVAL"
-        if [ -n "$_ciphersuites" ]; then
-            _err=$(curl --proto '=https' --tlsv1.2 --ciphers "$_ciphersuites" --silent --show-error --fail --location "$1" --output "$2" 2>&1)
-            _status=$?
-        else
-            echo "Warning: Not enforcing strong cipher suites for TLS, this is potentially less secure"
-            if ! check_help_for "$3" curl --proto --tlsv1.2; then
-                echo "Warning: Not enforcing TLS v1.2, this is potentially less secure"
-                _err=$(curl --silent --show-error --fail --location "$1" --output "$2" 2>&1)
-                _status=$?
-            else
-                _err=$(curl --proto '=https' --tlsv1.2 --silent --show-error --fail --location "$1" --output "$2" 2>&1)
-                _status=$?
-            fi
-        fi
-        if [ -n "$_err" ]; then
-            echo "$_err" >&2
-            if echo "$_err" | grep -q 404$; then
-                err "installer for platform '$3' not found 8^C - ask ellis to support your platform"
-            fi
-        fi
-        return $_status
-    elif [ "$_dld" = wget ]; then
-        get_ciphersuites_for_wget
-        _ciphersuites="$RETVAL"
-        if [ -n "$_ciphersuites" ]; then
-            _err=$(wget --https-only --secure-protocol=TLSv1_2 --ciphers "$_ciphersuites" "$1" -O "$2" 2>&1)
-            _status=$?
-        else
-            echo "Warning: Not enforcing strong cipher suites for TLS, this is potentially less secure"
-            if ! check_help_for "$3" wget --https-only --secure-protocol; then
-                echo "Warning: Not enforcing TLS v1.2, this is potentially less secure"
-                _err=$(wget "$1" -O "$2" 2>&1)
-                _status=$?
-            else
-                _err=$(wget --https-only --secure-protocol=TLSv1_2 "$1" -O "$2" 2>&1)
-                _status=$?
-            fi
-        fi
-        if [ -n "$_err" ]; then
-            echo "$_err" >&2
-            if echo "$_err" | grep -q ' 404 Not Found$'; then
-                err "installer for platform '$3' not found!"
-            fi
-        fi
-        return $_status
-    else
-        err "Unknown downloader"   # should not reach here
-    fi
-}
-
-check_help_for() {
-    local _arch
-    local _cmd
-    local _arg
-    _arch="$1"
-    shift
-    _cmd="$1"
-    shift
-
-    local _category
-    if "$_cmd" --help | grep -q 'For all options use the manual or "--help all".'; then
-      _category="all"
-    else
-      _category=""
-    fi
-
-    case "$_arch" in
-
-        *darwin*)
-        if check_cmd sw_vers; then
-            case $(sw_vers -productVersion) in
-                10.*)
-                    # If we're running on macOS, older than 10.13, then we always
-                    # fail to find these options to force fallback
-                    if [ "$(sw_vers -productVersion | cut -d. -f2)" -lt 13 ]; then
-                        # Older than 10.13
-                        echo "Warning: Detected macOS platform older than 10.13"
-                        return 1
-                    fi
-                    ;;
-                11.*)
-                    # We assume Big Sur will be OK for now
-                    ;;
-                *)
-                    # Unknown product version, warn and continue
-                    echo "Warning: Detected unknown macOS major version: $(sw_vers -productVersion)"
-                    echo "Warning TLS capabilities detection may fail"
-                    ;;
-            esac
-        fi
-        ;;
-
-    esac
-
-    for _arg in "$@"; do
-        if ! "$_cmd" --help $_category | grep -q -- "$_arg"; then
-            return 1
-        fi
-    done
-
-    true # not strictly needed
-}
-
-# Return cipher suite string specified by user, otherwise return strong TLS 1.2-1.3 cipher suites
-# if support by local tools is detected. Detection currently supports these curl backends: 
-# GnuTLS and OpenSSL (possibly also LibreSSL and BoringSSL). Return value can be empty.
-get_ciphersuites_for_curl() {
-    if [ -n "${BABEL_TLS_CIPHERSUITES-}" ]; then
-        # user specified custom cipher suites, assume they know what they're doing
-        RETVAL="$BABEL_TLS_CIPHERSUITES"
-        return
-    fi
-
-    local _openssl_syntax="no"
-    local _gnutls_syntax="no"
-    local _backend_supported="yes"
-    if curl -V | grep -q ' OpenSSL/'; then
-        _openssl_syntax="yes"
-    elif curl -V | grep -iq ' LibreSSL/'; then
-        _openssl_syntax="yes"
-    elif curl -V | grep -iq ' BoringSSL/'; then
-        _openssl_syntax="yes"
-    elif curl -V | grep -iq ' GnuTLS/'; then
-        _gnutls_syntax="yes"
-    else
-        _backend_supported="no"
-    fi
-
-    local _args_supported="no"
-    if [ "$_backend_supported" = "yes" ]; then
-        # "unspecified" is for arch, allows for possibility old OS using macports, homebrew, etc.
-        if check_help_for "notspecified" "curl" "--tlsv1.2" "--ciphers" "--proto"; then
-            _args_supported="yes"
-        fi
-    fi
-
-    local _cs=""
-    if [ "$_args_supported" = "yes" ]; then
-        if [ "$_openssl_syntax" = "yes" ]; then
-            _cs=$(get_strong_ciphersuites_for "openssl")
-        elif [ "$_gnutls_syntax" = "yes" ]; then
-            _cs=$(get_strong_ciphersuites_for "gnutls")
-        fi
-    fi
-
-    RETVAL="$_cs"
-}
-
-# Return cipher suite string specified by user, otherwise return strong TLS 1.2-1.3 cipher suites
-# if support by local tools is detected. Detection currently supports these wget backends: 
-# GnuTLS and OpenSSL (possibly also LibreSSL and BoringSSL). Return value can be empty.
-get_ciphersuites_for_wget() {
-    if [ -n "${BABEL_TLS_CIPHERSUITES-}" ]; then
-        # user specified custom cipher suites, assume they know what they're doing
-        RETVAL="$BABEL_TLS_CIPHERSUITES"
-        return
-    fi
-
-    local _cs=""
-    if wget -V | grep -q '\-DHAVE_LIBSSL'; then
-        # "unspecified" is for arch, allows for possibility old OS using macports, homebrew, etc.
-        if check_help_for "notspecified" "wget" "TLSv1_2" "--ciphers" "--https-only" "--secure-protocol"; then
-            _cs=$(get_strong_ciphersuites_for "openssl")
-        fi
-    elif wget -V | grep -q '\-DHAVE_LIBGNUTLS'; then
-        # "unspecified" is for arch, allows for possibility old OS using macports, homebrew, etc.
-        if check_help_for "notspecified" "wget" "TLSv1_2" "--ciphers" "--https-only" "--secure-protocol"; then
-            _cs=$(get_strong_ciphersuites_for "gnutls")
-        fi
-    fi
-
-    RETVAL="$_cs"
-}
-
-# Return strong TLS 1.2-1.3 cipher suites in OpenSSL or GnuTLS syntax. TLS 1.2 
-# excludes non-ECDHE and non-AEAD cipher suites. DHE is excluded due to bad 
-# DH params often found on servers (see RFC 7919). Sequence matches or is
-# similar to Firefox 68 ESR with weak cipher suites disabled via about:config.  
-# $1 must be openssl or gnutls.
-get_strong_ciphersuites_for() {
-    if [ "$1" = "openssl" ]; then
-        # OpenSSL is forgiving of unknown values, no problems with TLS 1.3 values on versions that don't support it yet.
-        echo "TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384"
-    elif [ "$1" = "gnutls" ]; then
-        # GnuTLS isn't forgiving of unknown values, so this may require a GnuTLS version that supports TLS 1.3 even if wget doesn't.
-        # Begin with SECURE128 (and higher) then remove/add to build cipher suites. Produces same 9 cipher suites as OpenSSL but in slightly different order.
-        echo "SECURE128:-VERS-SSL3.0:-VERS-TLS1.0:-VERS-TLS1.1:-VERS-DTLS-ALL:-CIPHER-ALL:-MAC-ALL:-KX-ALL:+AEAD:+ECDHE-ECDSA:+ECDHE-RSA:+AES-128-GCM:+CHACHA20-POLY1305:+AES-256-GCM"
-    fi 
-}
-
-main "$@" || exit 1