guix - Wojtek's customized Guix

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#!/bin/sh
# GNU Guix --- Functional package management for GNU
# Copyright © 2017 sharlatan <sharlatanus@gmail.com>
# Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
# Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
# Copyright © 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
# Copyright © 2020 Morgan Smith <Morgan.J.Smith@outlook.com>
# Copyright © 2020 Simon Tournier <zimon.toutoune@gmail.com>
# Copyright © 2020 Daniel Brooks <db48x@db48x.net>
# Copyright © 2021 Jakub Kądziołka <kuba@kadziolka.net>
#
# This file is part of GNU Guix.
#
# GNU Guix is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or (at
# your option) any later version.
#
# GNU Guix is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

# We require Bash but for portability we'd rather not use /bin/bash or
# /usr/bin/env in the shebang, hence this hack.
if [ "x$BASH_VERSION" = "x" ]
then
    exec bash "$0" "$@"
fi

set -e

[ "$UID" -eq 0 ] || { echo "This script must be run as root."; exit 1; }

REQUIRE=(
    "dirname"
    "readlink"
    "wget"
    "gpg"
    "grep"
    "which"
    "sed"
    "sort"
    "getent"
    "mktemp"
    "rm"
    "chmod"
    "uname"
    "groupadd"
    "tail"
    "tr"
    "xz"
)

PAS=$'[ \033[32;1mPASS\033[0m ] '
ERR=$'[ \033[31;1mFAIL\033[0m ] '
WAR=$'[ \033[33;1mWARN\033[0m ] '
INF="[ INFO ] "

DEBUG=0
GNU_URL="https://ftp.gnu.org/gnu/guix/"
#GNU_URL="https://alpha.gnu.org/gnu/guix/"
OPENPGP_SIGNING_KEY_ID="3CE464558A84FDC69DB40CFB090B11993D9AEBB5"

# This script needs to know where root's home directory is.  However, we
# cannot simply use the HOME environment variable, since there is no guarantee
# that it points to root's home directory.
ROOT_HOME="$(echo ~root)"

# ------------------------------------------------------------------------------
#+UTILITIES

_err()
{ # All errors go to stderr.
    printf "[%s]: %s\n" "$(date +%s.%3N)" "$1"
}

_msg()
{ # Default message to stdout.
    printf "[%s]: %s\n" "$(date +%s.%3N)" "$1"
}

_debug()
{
    if [ "${DEBUG}" = '1' ]; then
        printf "[%s]: %s\n" "$(date +%s.%3N)" "$1"
    fi
}


chk_require()
{ # Check that every required command is available.
    declare -a warn
    local c

    _debug "--- [ $FUNCNAME ] ---"

    for c in "$@"; do
        command -v "$c" &>/dev/null || warn+=("$c")
    done

    [ "${#warn}" -ne 0 ] &&
        { _err "${ERR}Missing commands: ${warn[*]}.";
          return 1; }
    
    _msg "${PAS}verification of required commands completed"
}

chk_gpg_keyring()
{ # Check whether the Guix release signing public key is present.
    _debug "--- [ $FUNCNAME ] ---"

    # Without --dry-run this command will create a ~/.gnupg owned by root on
    # systems where gpg has never been used, causing errors and confusion.
    gpg --dry-run --list-keys ${OPENPGP_SIGNING_KEY_ID} >/dev/null 2>&1 || (
        _err "${ERR}Missing OpenPGP public key.  Fetch it with this command:"
        echo "  wget 'https://sv.gnu.org/people/viewgpg.php?user_id=15145' -qO - | sudo -i gpg --import -"
        exit 1
    )
}

chk_term()
{ # Check for ANSI terminal for color printing.
    local ansi_term

    if [ -t 2 ]; then
        if [ "${TERM+set}" = 'set' ]; then
            case "$TERM" in
                xterm*|rxvt*|urxvt*|linux*|vt*|eterm*|screen*)
                    ansi_term=true
                    ;;
                *)
                    ansi_term=false
                    ERR="[ FAIL ] "
                    PAS="[ PASS ] "
                    ;;
            esac
        fi
    fi
}

chk_init_sys()
{ # Return init system type name.
    if [[ $(/sbin/init --version 2>/dev/null) =~ upstart ]]; then
        _msg "${INF}init system is: upstart"
        INIT_SYS="upstart"
        return 0
    elif [[ $(systemctl 2>/dev/null) =~ -\.mount ]]; then
        _msg "${INF}init system is: systemd"
        INIT_SYS="systemd"
        return 0
    elif [[ -f /etc/init.d/cron && ! -h /etc/init.d/cron ]]; then
        _msg "${INF}init system is: sysv-init"
        INIT_SYS="sysv-init"
        return 0
    elif [[ $(openrc --version 2>/dev/null) =~ \(OpenRC\) ]]; then
        _msg "${INF}init system is: OpenRC"
        INIT_SYS="openrc"
        return 0
    else
        INIT_SYS="NA"
        _err "${ERR}Init system could not be detected."
    fi
}

chk_sys_arch()
{ # Check for operating system and architecture type.
    local os
    local arch

    os="$(uname -s)"
    arch="$(uname -m)"

    case "$arch" in
        i386 | i486 | i686 | i786 | x86)
            local arch=i686
            ;;
        x86_64 | x86-64 | x64 | amd64)
            local arch=x86_64
            ;;
        aarch64)
            local arch=aarch64
            ;;
        armv7l)
            local arch=armhf
            ;;
        *)
            _err "${ERR}Unsupported CPU type: ${arch}"
            exit 1
    esac

    case "$os" in
        Linux | linux)
            local os=linux
            ;;
        *)
            _err "${ERR}Your operation system (${os}) is not supported."
            exit 1
    esac

    ARCH_OS="${arch}-${os}"
}

chk_sys_nscd()
{ # Check if nscd is up and suggest to start it or install it
    if [ "$(type -P pidof)" ]; then
        if [ ! "$(pidof nscd)" ]; then
            _msg "${WAR}We recommend installing and/or starting your distribution 'nscd' service"
            _msg "${WAR}Please read 'info guix \"Application Setup\"' about \"Name Service Switch\""
        fi
    else
        _msg "${INF}We cannot determine if your distribution 'nscd' service is running"
        _msg "${INF}Please read 'info guix \"Application Setup\"' about \"Name Service Switch\""
    fi
}

# ------------------------------------------------------------------------------
#+MAIN

guix_get_bin_list()
{ # Scan GNU archive and save list of binaries
    local gnu_url="$1"
    local -a bin_ver_ls
    local latest_ver
    local default_ver

    _debug "--- [ $FUNCNAME ] ---"

    # Filter only version and architecture
    bin_ver_ls=("$(wget -qO- "$gnu_url" \
        | sed -n -e 's/.*guix-binary-\([0-9.]*[a-z0-9]*\)\..*.tar.xz.*/\1/p' \
        | sort -Vu)")

    latest_ver="$(echo "${bin_ver_ls[0]}" \
                       | grep -oE "([0-9]{1,2}\.){2}[0-9]{1,2}[a-z0-9]*" \
                       | tail -n1)"

    default_ver="guix-binary-${latest_ver}.${ARCH_OS}"

    if [[ "${#bin_ver_ls}" -ne "0" ]]; then
        _msg "${PAS}Release for your system: ${default_ver}"
    else
        _err "${ERR}Could not obtain list of Guix releases."
        exit 1
    fi

    # Use default to download according to the list and local ARCH_OS.
    BIN_VER="${default_ver}"
}

guix_get_bin()
{ # Download and verify binary package.
    local url="$1"
    local bin_ver="$2"
    local dl_path="$3"

    _debug "--- [ $FUNCNAME ] ---"

    _msg "${INF}Downloading Guix release archive"

    wget --help | grep -q '\--show-progress' && \
        _PROGRESS_OPT="-q --show-progress" || _PROGRESS_OPT=""
    wget $_PROGRESS_OPT -P "$dl_path" "${url}/${bin_ver}.tar.xz" "${url}/${bin_ver}.tar.xz.sig"

    if [[ "$?" -eq 0 ]]; then
       _msg "${PAS}download completed."
    else
        _err "${ERR}could not download ${url}/${bin_ver}.tar.xz."
        exit 1
    fi

    pushd "${dl_path}" >/dev/null
    gpg --verify "${bin_ver}.tar.xz.sig" >/dev/null 2>&1
    if [[ "$?" -eq 0 ]]; then
        _msg "${PAS}Signature is valid."
        popd >/dev/null
    else
        _err "${ERR}could not verify the signature."
        exit 1
    fi
}

sys_create_store()
{ # Unpack and install /gnu/store and /var/guix
    local pkg="$1"
    local tmp_path="$2"

    _debug "--- [ $FUNCNAME ] ---"

    cd "$tmp_path"
    tar --extract \
        --file "$pkg" &&
    _msg "${PAS}unpacked archive"

    if [[ -e "/var/guix" || -e "/gnu" ]]; then
        _err "${ERR}A previous Guix installation was found.  Refusing to overwrite."
        exit 1
    else
        _msg "${INF}Installing /var/guix and /gnu..."
        mv "${tmp_path}/var/guix" /var/
        mv "${tmp_path}/gnu" /
    fi

    _msg "${INF}Linking the root user's profile"
    mkdir -p "${ROOT_HOME}/.config/guix"
    ln -sf /var/guix/profiles/per-user/root/current-guix \
       "${ROOT_HOME}/.config/guix/current"

    GUIX_PROFILE="${ROOT_HOME}/.config/guix/current"
    source "${GUIX_PROFILE}/etc/profile"
    _msg "${PAS}activated root profile at ${ROOT_HOME}/.config/guix/current"
}

sys_create_build_user()
{ # Create the group and user accounts for build users.

    _debug "--- [ $FUNCNAME ] ---"

    if [ $(getent group guixbuild) ]; then
        _msg "${INF}group guixbuild exists"
    else
        groupadd --system guixbuild
        _msg "${PAS}group <guixbuild> created"
    fi

    for i in $(seq -w 1 10); do
        if id "guixbuilder${i}" &>/dev/null; then
            _msg "${INF}user is already in the system, reset"
            usermod -g guixbuild -G guixbuild           \
                    -d /var/empty -s "$(which nologin)" \
                    -c "Guix build user $i"             \
                    "guixbuilder${i}";
        else
            useradd -g guixbuild -G guixbuild           \
                    -d /var/empty -s "$(which nologin)" \
                    -c "Guix build user $i" --system    \
                    "guixbuilder${i}";
            _msg "${PAS}user added <guixbuilder${i}>"
        fi
    done
}

sys_enable_guix_daemon()
{ # Run the daemon, and set it to automatically start on boot.

    local info_path
    local local_bin
    local var_guix

    _debug "--- [ $FUNCNAME ] ---"

    info_path="/usr/local/share/info"
    local_bin="/usr/local/bin"
    var_guix="/var/guix/profiles/per-user/root/current-guix"

    case "$INIT_SYS" in
        upstart)
            { initctl reload-configuration;
              cp "${ROOT_HOME}/.config/guix/current/lib/upstart/system/guix-daemon.conf" \
                 /etc/init/ &&
                  start guix-daemon; } &&
                _msg "${PAS}enabled Guix daemon via upstart"
            ;;
        systemd)
            { # systemd .mount units must be named after the target directory.
              # Here we assume a hard-coded name of /gnu/store.
              # XXX Work around <https://issues.guix.gnu.org/41356> until next release.
              if [ -f "${ROOT_HOME}/.config/guix/current/lib/systemd/system/gnu-store.mount" ]; then
                  cp "${ROOT_HOME}/.config/guix/current/lib/systemd/system/gnu-store.mount" \
                     /etc/systemd/system/;
                  chmod 664 /etc/systemd/system/gnu-store.mount;
                  systemctl daemon-reload &&
                      systemctl enable gnu-store.mount;
              fi

              cp "${ROOT_HOME}/.config/guix/current/lib/systemd/system/guix-daemon.service" \
                 /etc/systemd/system/;
              chmod 664 /etc/systemd/system/guix-daemon.service;

              # Work around <https://bugs.gnu.org/36074>, present in 1.0.1.
              sed -i /etc/systemd/system/guix-daemon.service \
                  -e "s/GUIX_LOCPATH='/'GUIX_LOCPATH=/";

              # Work around <https://bugs.gnu.org/35671>, present in 1.0.1.
              if ! grep en_US /etc/systemd/system/guix-daemon.service >/dev/null;
              then sed -i /etc/systemd/system/guix-daemon.service \
                       -e 's/^Environment=\(.*\)$/Environment=\1 LC_ALL=en_US.UTF-8';
              fi;

              systemctl daemon-reload &&
                  systemctl enable guix-daemon &&
                  systemctl start  guix-daemon; } &&
                _msg "${PAS}enabled Guix daemon via systemd"
            ;;
        sysv-init)
            { mkdir -p /etc/init.d;
              cp "${ROOT_HOME}/.config/guix/current/etc/init.d/guix-daemon" \
                 /etc/init.d/guix-daemon;
              chmod 775 /etc/init.d/guix-daemon;

              update-rc.d guix-daemon defaults &&
                  update-rc.d guix-daemon enable &&
                  service guix-daemon start; } &&
                _msg "${PAS}enabled Guix daemon via sysv"
            ;;
        openrc)
            { mkdir -p /etc/init.d;
              cp "${ROOT_HOME}/.config/guix/current/etc/openrc/guix-daemon" \
                 /etc/init.d/guix-daemon;
              chmod 775 /etc/init.d/guix-daemon;

              rc-update add guix-daemon default &&
                  rc-service guix-daemon start; } &&
                _msg "${PAS}enabled Guix daemon via OpenRC"
            ;;
        NA|*)
            _msg "${ERR}unsupported init system; run the daemon manually:"
            echo "  ${ROOT_HOME}/.config/guix/current/bin/guix-daemon --build-users-group=guixbuild"
            ;;
    esac

    _msg "${INF}making the guix command available to other users"

    [ -e "$local_bin" ] || mkdir -p "$local_bin"
    ln -sf "${var_guix}/bin/guix"  "$local_bin"

    [ -e "$info_path" ] || mkdir -p "$info_path"
    for i in "${var_guix}"/share/info/*; do
        ln -sf "$i" "$info_path"
    done
}

sys_authorize_build_farms()
{ # authorize the public key of the build farm
    while true; do
        read -p "Permit downloading pre-built package binaries from the project's build farm? (yes/no) " yn
        case $yn in
            [Yy]*) guix archive --authorize < "${ROOT_HOME}/.config/guix/current/share/guix/ci.guix.gnu.org.pub" &&
                       _msg "${PAS}Authorized public key for ci.guix.gnu.org";
                   break;;
            [Nn]*) _msg "${INF}Skipped authorizing build farm public keys"
                   break;;
            *) _msg "Please answer yes or no.";
        esac
    done
}

sys_create_init_profile()
{ # Create /etc/profile.d/guix.sh for better desktop integration
  # This will not take effect until the next shell or desktop session!
    [ -d "/etc/profile.d" ] || mkdir /etc/profile.d # Just in case
    cat <<"EOF" > /etc/profile.d/guix.sh
# _GUIX_PROFILE: `guix pull` profile
_GUIX_PROFILE="$HOME/.config/guix/current"
export PATH="$_GUIX_PROFILE/bin${PATH:+:}$PATH"
# Export INFOPATH so that the updated info pages can be found
# and read by both /usr/bin/info and/or $GUIX_PROFILE/bin/info
# When INFOPATH is unset, add a trailing colon so that Emacs
# searches 'Info-default-directory-list'.
export INFOPATH="$_GUIX_PROFILE/share/info:$INFOPATH"

# GUIX_PROFILE: User's default profile
GUIX_PROFILE="$HOME/.guix-profile"
[ -L $GUIX_PROFILE ] || return
GUIX_LOCPATH="$GUIX_PROFILE/lib/locale"
export GUIX_PROFILE GUIX_LOCPATH

[ -f "$GUIX_PROFILE/etc/profile" ] && . "$GUIX_PROFILE/etc/profile"

# set XDG_DATA_DIRS to include Guix installations
export XDG_DATA_DIRS="$GUIX_PROFILE/share:${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}"
EOF
}

sys_create_shell_completion()
{ # Symlink supported shell completions system-wide

    var_guix=/var/guix/profiles/per-user/root/current-guix
    bash_completion=/etc/bash_completion.d
    zsh_completion=/usr/share/zsh/site-functions
    fish_completion=/usr/share/fish/vendor_completions.d

    { # Just in case
        for dir_shell in $bash_completion $zsh_completion $fish_completion; do
            [ -d "$dir_shell" ] || mkdir -p $dir_shell
        done;

        ln -sf ${var_guix}/etc/bash_completion.d/* "$bash_completion";
        ln -sf ${var_guix}/share/zsh/site-functions/* "$zsh_completion";
        ln -sf ${var_guix}/share/fish/vendor_completions.d/* "$fish_completion"; } &&
        _msg "${PAS}installed shell completion"
}


welcome()
{
    cat<<"EOF"
    ░░░                                     ░░░
    ░░▒▒░░░░░░░░░               ░░░░░░░░░▒▒░░
     ░░▒▒▒▒▒░░░░░░░           ░░░░░░░▒▒▒▒▒░
         ░▒▒▒░░▒▒▒▒▒         ░░░░░░░▒▒░
               ░▒▒▒▒░       ░░░░░░
                ▒▒▒▒▒      ░░░░░░
                 ▒▒▒▒▒     ░░░░░
                 ░▒▒▒▒▒   ░░░░░
                  ▒▒▒▒▒   ░░░░░
                   ▒▒▒▒▒ ░░░░░
                   ░▒▒▒▒▒░░░░░
                    ▒▒▒▒▒▒░░░
                     ▒▒▒▒▒▒░
     _____ _   _ _    _    _____       _
    / ____| \ | | |  | |  / ____|     (_)
   | |  __|  \| | |  | | | |  __ _   _ ___  __
   | | |_ | . ' | |  | | | | |_ | | | | \ \/ /
   | |__| | |\  | |__| | | |__| | |_| | |>  <
    \_____|_| \_|\____/   \_____|\__,_|_/_/\_\

This script installs GNU Guix on your system

https://www.gnu.org/software/guix/
EOF
    echo -n "Press return to continue..."
    read -r  ANSWER
}

main()
{
    local tmp_path
    welcome

    _msg "Starting installation ($(date))"

    chk_term
    chk_require "${REQUIRE[@]}"
    chk_gpg_keyring
    chk_init_sys
    chk_sys_arch
    chk_sys_nscd

    _msg "${INF}system is ${ARCH_OS}"

    umask 0022
    tmp_path="$(mktemp -t -d guix.XXX)"

    guix_get_bin_list "${GNU_URL}"
    guix_get_bin "${GNU_URL}" "${BIN_VER}" "$tmp_path"

    sys_create_store "${BIN_VER}.tar.xz" "${tmp_path}"
    sys_create_build_user
    sys_enable_guix_daemon
    sys_authorize_build_farms
    sys_create_init_profile
    sys_create_shell_completion

    _msg "${INF}cleaning up ${tmp_path}"
    rm -r "${tmp_path}"

    _msg "${PAS}Guix has successfully been installed!"
    _msg "${INF}Run 'info guix' to read the manual."

    # Required to source /etc/profile in desktop environments.
    _msg "${INF}Please log out and back in to complete the installation."
 }

main "$@"


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