Mercurial > demo / tools/deps.sh

 #!/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