#!/bin/sh # shellcheck shell=dash # If you need an offline install, or you'd prefer to run the binary directly, head to # https://github.com/DeterminateSystems/nix-installer/releases then pick the version and platform # most appropriate for your deployment target. # # This is just a little script that selects and downloads the right `nix-installer`. It does # platform detection, downloads the installer, and runs it; that's it. # # It runs on Unix shells like {a,ba,da,k,z}sh. It uses the common `local` # extension. Note: Most shells limit `local` to 1 var per line, contra bash. # This script is based off https://github.com/rust-lang/rustup/blob/f8d7b3baba7a63237cb2b82ef49a68a37dd0633c/rustup-init.sh if [ "$KSH_VERSION" = 'Version JM 93t+ 2010-03-05' ]; then # The version of ksh93 that ships with many illumos systems does not # support the "local" extension. Print a message rather than fail in # subtle ways later on: echo 'nix-installer does not work with this ksh93 version; please try bash!' >&2 exit 1 fi set -u # If NIX_INSTALLER_FORCE_ALLOW_HTTP is unset or empty, default it. NIX_INSTALLER_BINARY_ROOT="${NIX_INSTALLER_BINARY_ROOT:-https://install.determinate.systems/nix}" main() { downloader --check need_cmd uname need_cmd mktemp need_cmd chmod need_cmd mkdir need_cmd rm need_cmd rmdir get_architecture || return 1 local _arch="$RETVAL" assert_nz "$_arch" "arch" local _ext="" case "$_arch" in *windows*) _ext=".exe" ;; esac local _url="${NIX_INSTALLER_OVERRIDE_URL-${NIX_INSTALLER_BINARY_ROOT}/nix-installer-${_arch}${_ext}}" local _dir if ! _dir="$(ensure mktemp -d)"; then # Because the previous command ran in a subshell, we must manually # propagate exit status. exit 1 fi local _file="${_dir}/nix-installer${_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 --no-confirm) need_tty=no ;; *) continue ;; esac done if [ "${NIX_INSTALLER_NO_CONFIRM-}" ]; then need_tty=no fi if $_ansi_escapes_are_valid; then printf "\33[1minfo:\33[0m downloading installer \33[4m%s\33[0m\n" "$_url" 1>&2 else printf 'info: downloading installer (%s)\n' "$_url" 1>&2 fi ensure mkdir -p "$_dir" ensure downloader "$_url" "$_file" "$_arch" ensure chmod u+x "$_file" if [ ! -x "$_file" ]; then printf '%s\n' "Cannot execute $_file (likely because of mounting /tmp as noexec)." 1>&2 printf '%s\n' "Please copy the file to a location where you can execute binaries and run ./nix-installer${_ext}." 1>&2 exit 1 fi if [ "$need_tty" = "yes" ] && [ ! -t 0 ]; then # The installer is going to want to ask for confirmation by # reading stdin. This script was piped into `sh` though and # doesn't have stdin to pass to its children. Instead we're going # to explicitly connect /dev/tty to the installer's stdin. if [ ! -t 1 ]; then err "Unable to run interactively. Run with --no-confirm to accept defaults, --help for additional options" fi ignore "$_file" "$@" < /dev/tty else ignore "$_file" "$@" fi local _retval=$? ignore rm "$_file" ignore rmdir "$_dir" return "$_retval" } check_proc() { # Check for /proc by looking for the /proc/self/exe link # This is only run on Linux if ! test -L /proc/self/exe ; then err "fatal: Unable to find /proc/self/exe. Is /proc mounted? Installation cannot proceed without /proc." fi } get_architecture() { local _ostype _cputype _arch _ostype="$(uname -s)" _cputype="$(uname -m)" if [ "$_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 ]; then # Darwin `uname -m` can lie due to Rosetta shenanigans. If you manage to # invoke a native shell binary and then a native uname binary, you can # get the real answer, but that's hard to ensure, so instead we use # `sysctl` (which doesn't lie) to check for the actual architecture. if [ "$_cputype" = i386 ]; then # Handling i386 compatibility mode in older macOS versions (<10.15) # running on x86_64-based Macs. # Starting from 10.15, macOS explicitly bans all i386 binaries from running. # See: # Avoid `sysctl: unknown oid` stderr output and/or non-zero exit code. if sysctl hw.optional.x86_64 2> /dev/null || true | grep -q ': 1'; then _cputype=x86_64 fi elif [ "$_cputype" = x86_64 ]; then # Handling x86-64 compatibility mode (a.k.a. Rosetta 2) # in newer macOS versions (>=11) running on arm64-based Macs. # Rosetta 2 is built exclusively for x86-64 and cannot run i386 binaries. # Avoid `sysctl: unknown oid` stderr output and/or non-zero exit code. if sysctl hw.optional.arm64 2> /dev/null || true | grep -q ': 1'; then _cputype=arm64 fi 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 Linux) check_proc _ostype=linux ;; Darwin) _ostype=darwin ;; *) err "unrecognized OS type: $_ostype" ;; esac case "$_cputype" in aarch64 | arm64) _cputype=aarch64 ;; x86_64 | x86-64 | x64 | amd64) _cputype=x86_64 ;; i686) _cputype=i686 ;; *) err "unknown CPU type: $_cputype" ;; esac _arch="${_cputype}-${_ostype}" RETVAL="$_arch" } say() { printf 'nix-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 } assert_nz() { if [ -z "$1" ]; then err "assert_nz $2"; fi } # Run a command that should never fail. If the command fails execution # will immediately terminate with an error showing the failing # command. ensure() { if ! "$@"; then err "command failed: $*"; fi } # This is just for indicating that commands' results are being # intentionally ignored. Usually, because it's being executed # as part of error handling. ignore() { "$@" } # This wraps curl or wget. Try curl first, if not installed, # use wget instead. downloader() { local _dld local _ciphersuites local _err local _status local _retry 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 [ "$_dld" = curl ]; then check_curl_for_retry_support _retry="$RETVAL" get_ciphersuites_for_curl _ciphersuites="$RETVAL" if [ -n "$_ciphersuites" ]; then if [ -n "${NIX_INSTALLER_FORCE_ALLOW_HTTP-}" ]; then _err=$(curl $_retry --silent --show-error --fail --location "$1" --output "$2" 2>&1) else _err=$(curl $_retry --proto '=https' --tlsv1.2 --ciphers "$_ciphersuites" --silent --show-error --fail --location "$1" --output "$2" 2>&1) fi _status=$? 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 $_retry --silent --show-error --fail --location "$1" --output "$2" 2>&1) _status=$? else _err=$(curl $_retry --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, this may be unsupported" fi fi return $_status elif [ "$_dld" = wget ]; then if [ "$(wget -V 2>&1|head -2|tail -1|cut -f1 -d" ")" = "BusyBox" ]; then echo "Warning: using the BusyBox version of wget. Not enforcing strong cipher suites for TLS or TLS v1.2, this is potentially less secure" _err=$(wget "$1" -O "$2" 2>&1) _status=$? else 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 fi if [ -n "$_err" ]; then echo "$_err" >&2 if echo "$_err" | grep -q ' 404 Not Found$'; then err "installer for platform '$3' not found, this may be unsupported" 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 } # Check if curl supports the --retry flag, then pass it to the curl invocation. check_curl_for_retry_support() { local _retry_supported="" # "unspecified" is for arch, allows for possibility old OS using macports, homebrew, etc. if check_help_for "notspecified" "curl" "--retry"; then _retry_supported="--retry 3" fi RETVAL="$_retry_supported" } # Return cipher suite string specified by user, otherwise return strong TLS 1.2-1.3 cipher suites # if support by local tools is detected. Detection currently supports these curl backends: # GnuTLS and OpenSSL (possibly also LibreSSL and BoringSSL). Return value can be empty. get_ciphersuites_for_curl() { if [ -n "${RUSTUP_TLS_CIPHERSUITES-}" ]; then # user specified custom cipher suites, assume they know what they're doing RETVAL="$RUSTUP_TLS_CIPHERSUITES" return fi local _openssl_syntax="no" local _gnutls_syntax="no" local _backend_supported="yes" if curl -V | grep -q ' OpenSSL/'; then _openssl_syntax="yes" elif curl -V | grep -iq ' LibreSSL/'; then _openssl_syntax="yes" elif curl -V | grep -iq ' BoringSSL/'; then _openssl_syntax="yes" elif curl -V | grep -iq ' GnuTLS/'; then _gnutls_syntax="yes" else _backend_supported="no" fi local _args_supported="no" if [ "$_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 "${RUSTUP_TLS_CIPHERSUITES-}" ]; then # user specified custom cipher suites, assume they know what they're doing RETVAL="$RUSTUP_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