fuelup-init.sh

#!/bin/sh
set -e

FUELUP_DIR=${FUELUP_DIR-"$HOME/.fuelup"}

main() {
    need_cmd git
    need_cmd curl
    need_cmd chmod
    need_cmd mkdir
    need_cmd rm
    need_cmd rmdir
    need_cmd jq

    check_cargo_bin forc
    check_cargo_bin forc-fmt
    check_cargo_bin forc-explore
    check_cargo_bin forc-lsp
    check_cargo_bin fuel-core 

    get_architecture || return 1
    local _arch="$RETVAL"
    assert_nz "$_arch" "arch"

    mkdir -p "$FUELUP_DIR/bin"

    local _fuelup_version
    _fuelup_version="$(curl -s https://api.github.com/repos/FuelLabs/fuelup/releases/latest | jq -r ".tag_name")"
    _fuelup_version="$(echo "${_fuelup_version}" | cut -c 2-)"
    local _fuelup_url="https://github.com/FuelLabs/fuelup/releases/download/v${_fuelup_version}/fuelup-${_fuelup_version}-${_arch}.tar.gz"

    local _dir
    _dir="$(ensure mktemp -d)"
    local _file="${_dir}/fuelup.tar.gz"

    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
            --help)
                usage
                exit 0
                ;;
            *)
                OPTIND=1
                if [ "${arg%%--*}" = "" ]; then
                    # Long option (other than --help);
                    # don't attempt to interpret it.
                    continue
                fi
                while getopts :hy sub_arg "$arg"; do
                    case "$sub_arg" in
                        h)
                            usage
                            exit 0
                            ;;
                        y)
                            # user wants to skip the prompt --
                            # we don't need /dev/tty
                            need_tty=no
                            ;;
                        *)
                            ;;
                        esac
                done
                ;;
        esac
    done

    if $_ansi_escapes_are_valid; then
        printf "\33[1minfo:\33[0m downloading installer\n" 1>&2
    else
        printf '%s\n' 'info: downloading installer' 1>&2
    fi

    ensure downloader "$_fuelup_url" "$_file" "$_arch"

    ignore tar -xf "$_file" -C "$_dir"

    ensure mv "$_dir/fuelup-${_fuelup_version}-${_arch}/fuelup" "$FUELUP_DIR/bin/fuelup"
    ensure chmod u+x "$FUELUP_DIR/bin/fuelup"

    if [ ! -x "$FUELUP_DIR/bin/fuelup" ]; then
        printf '%s\n' "Cannot execute $_FUELUP_DIR/bin/fuelup." 1>&2
        printf '%s\n' "Please copy the file to a location where you can execute binaries and run ./fuelup." 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 -y to accept defaults, --help for additional options"
        fi

        ignore "$FUELUP_DIR/bin/fuelup" "$@" </dev/tty
    else
        ignore "$FUELUP_DIR/bin/fuelup" "$@"
    fi

    local _retval=$?

    ignore rm "$_file"
    ignore rmdir "$_dir/fuelup-${_fuelup_version}-${_arch}"
    ignore rmdir "$_dir"

    printf '\n'
    printf '%s\n' "fuelup ${_fuelup_version} has been installed in $FUELUP_DIR/bin. To fetch the latest forc and fuel-core binaries, run 'fuelup install'." 1>&2

    return "$_retval"
}

get_architecture() {
    local _ostype _cputype
    _ostype="$(uname -s)"
    _arch="$(uname -m)"

    case "$_ostype" in
    Linux)
        _ostype="unknown-linux-gnu"
        ;;
    Darwin)
        _ostype="apple-darwin"
        ;;
    *)
        err "unsupported os type: $_ostype"
        ;;
    esac

    case "$_arch" in
    x86_64 | x86-64 | x64 | amd64)
        _arch="x86_64"
        ;;
    aarch64 | arm64)
        _arch="aarch64"
        ;;
    *)
        err "unsupported cpu type: $_cputype"
        ;;
    esac

    _arch="${_arch}-${_ostype}"

    RETVAL="$_arch"
}

check_cargo_bin() {
    if which "${1}" | grep -q "[.cargo]"; then
      warn "$1 is already installed via cargo and is in use by your system. You should update your PATH, or execute 'cargo uninstall $1'"
    fi
}

assert_nz() {
    if [ -z "$1" ]; then err "assert_nz $2"; fi
}

say() {
    printf 'fuelup: %s\n' "$1"
}

need_cmd() {
    if ! check_cmd "$1"; then
        err "need '$1' (command not found)"
    fi
}

check_cmd() {
    command -v "$1" >/dev/null 2>&1
}

# 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
}

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
            _err=$(curl $_retry --proto '=https' --tlsv1.2 --ciphers "$_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 $_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 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"

}

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 "${RUSTUP_TLS_CIPHERSUITES-}" ]; then
        # user specified custom cipher suites, assume they know what they're doing
        RETVAL="$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 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
}

err() {
    say "$1" >&2
    exit 1
}

warn() {
  say "warning: ${1}" >&2
}

# This is just for indicating that commands' results are being
# intentionally ignored. Usually, because it's being executed
# as part of error handling.
ignore() {
    "$@"
}
main "$@" || exit 1