#!/bin/bash set -eu set -o pipefail # Sourced from: # - https://github.com/LnL7/nix-darwin/blob/8c29d0985d74b4a990238497c47a2542a5616b3c/bootstrap.sh # - https://gist.github.com/expipiplus1/e571ce88c608a1e83547c918591b149f/ac504c6c1b96e65505fbda437a28ce563408ecb0 # - https://github.com/NixOS/nixos-org-configurations/blob/a122f418797713d519aadf02e677fce0dc1cb446/delft/scripts/nix-mac-installer.sh # - https://github.com/matthewbauer/macNixOS/blob/f6045394f9153edea417be90c216788e754feaba/install-macNixOS.sh # - https://gist.github.com/LnL7/9717bd6cdcb30b086fd7f2093e5f8494/86b26f852ce563e973acd30f796a9a416248c34a # # however tracking which bits came from which would be impossible. readonly ESC='\033[0m' readonly BOLD='\033[38;1m' readonly BLUE='\033[38;34m' readonly BLUE_UL='\033[38;4;34m' readonly GREEN='\033[38;32m' readonly GREEN_UL='\033[38;4;32m' readonly RED='\033[38;31m' readonly RED_UL='\033[38;4;31m' readonly YELLOW='\033[38;33m' readonly YELLOW_UL='\033[38;4;33m' readonly CORES=$(sysctl -n hw.ncpu) readonly NIX_USER_COUNT="$CORES" readonly NIX_BUILD_GROUP_ID="30000" readonly NIX_BUILD_GROUP_NAME="nixbld" readonly NIX_FIRST_BUILD_UID="30001" # Please don't change this. We don't support it, because the # default shell profile that comes with Nix doesn't support it. readonly NIX_ROOT="/nix" readonly PLIST_DEST=/Library/LaunchDaemons/org.nixos.nix-daemon.plist readonly PROFILE_TARGETS=("/etc/bashrc" "/etc/zshrc") readonly PROFILE_BACKUP_SUFFIX=".backup-before-nix" readonly PROFILE_NIX_FILE="$NIX_ROOT/var/nix/profiles/default/etc/profile.d/nix-daemon.sh" readonly NIX_INSTALLED_NIX="@nix@" readonly NIX_INSTALLED_CACERT="@cacert@" readonly EXTRACTED_NIX_PATH="$(dirname "$0")" readonly ROOT_HOME="/var/root" if [ -t 0 ]; then readonly IS_HEADLESS='no' else readonly IS_HEADLESS='yes' fi headless() { if [ "$IS_HEADLESS" = "yes" ]; then return 0 else return 1 fi } contactme() { echo "We'd love to help if you need it." echo "" echo "If you can, open an issue at https://github.com/nixos/nix/issues" echo "" echo "Or feel free to contact the team," echo " - on IRC #nixos on irc.freenode.net" echo " - on twitter @nixos_org" } uninstall_directions() { subheader "Uninstalling nix:" local step=0 if [ -e "$PLIST_DEST" ]; then step=$((step + 1)) cat <<EOF $step. Delete $PLIST_DEST sudo launchctl unload $PLIST_DEST sudo rm $PLIST_DEST EOF fi for profile_target in "${PROFILE_TARGETS[@]}"; do if [ -e "$profile_target" ] && [ -e "$profile_target$PROFILE_BACKUP_SUFFIX" ]; then step=$((step + 1)) cat <<EOF $step. Restore $profile_target$PROFILE_BACKUP_SUFFIX back to $profile_target sudo mv $profile_target$PROFILE_BACKUP_SUFFIX $profile_target (after this one, you may need to re-open any terminals that were opened while it existed.) EOF fi done step=$((step + 1)) cat <<EOF $step. Delete the files Nix added to your system: sudo rm -rf /etc/nix $NIX_ROOT $ROOT_HOME/.nix-profile $ROOT_HOME/.nix-defexpr $ROOT_HOME/.nix-channels $HOME/.nix-profile $HOME/.nix-defexpr $HOME/.nix-channels and that is it. EOF } nix_user_for_core() { printf "nixbld%d" "$1" } nix_uid_for_core() { echo $((NIX_FIRST_BUILD_UID + $1 - 1)) } dsclattr() { /usr/bin/dscl . -read "$1" \ | awk "/$2/ { print \$2 }" } _textout() { echo -en "$1" shift if [ "$*" = "" ]; then cat else echo "$@" fi echo -en "$ESC" } header() { follow="---------------------------------------------------------" header=$(echo "---- $* $follow$follow$follow" | head -c 80) echo "" _textout "$BLUE" "$header" } warningheader() { follow="---------------------------------------------------------" header=$(echo "---- $* $follow$follow$follow" | head -c 80) echo "" _textout "$RED" "$header" } subheader() { echo "" _textout "$BLUE_UL" "$*" } row() { printf "$BOLD%s$ESC:\\t%s\\n" "$1" "$2" } task() { echo "" ok "~~> $1" } bold() { echo "$BOLD$*$ESC" } ok() { _textout "$GREEN" "$@" } warning() { warningheader "warning!" cat echo "" } failure() { header "oh no!" _textout "$RED" "$@" echo "" _textout "$RED" "$(contactme)" trap finish_cleanup EXIT exit 1 } ui_confirm() { _textout "$GREEN$GREEN_UL" "$1" if headless; then echo "No TTY, assuming you would say yes :)" return 0 fi local prompt="[y/n] " echo -n "$prompt" while read -r y; do if [ "$y" = "y" ]; then echo "" return 0 elif [ "$y" = "n" ]; then echo "" return 1 else _textout "$RED" "Sorry, I didn't understand. I can only understand answers of y or n" echo -n "$prompt" fi done echo "" return 1 } __sudo() { local expl="$1" local cmd="$2" shift header "sudo execution" echo "I am executing:" echo "" printf " $ sudo %s\\n" "$cmd" echo "" echo "$expl" echo "" return 0 } _sudo() { local expl="$1" shift if ! headless; then __sudo "$expl" "$*" fi sudo "$@" } readonly SCRATCH=$(mktemp -d -t tmp.XXXXXXXXXX) function finish_cleanup { rm -rf "$SCRATCH" } function finish_fail { finish_cleanup failure <<EOF Jeeze, something went wrong. If you can take all the output and open an issue, we'd love to fix the problem so nobody else has this issue. :( EOF } trap finish_fail EXIT function finish_success { finish_cleanup ok "Alright! We're done!" cat <<EOF Before Nix will work in your existing shells, you'll need to close them and open them again. Other than that, you should be ready to go. Try it! Open a new terminal, and type: $ nix-shell -p nix-info --run "nix-info -m" Thank you for using this installer. If you have any feedback, don't hesitate: $(contactme) EOF } validate_starting_assumptions() { if [ "$(uname -s)" != "Darwin" ]; then failure "This script is for use with macOS!" fi if [ $EUID -eq 0 ]; then failure <<EOF Please do not run this script with root privileges. We will call sudo when we need to. EOF fi if type nix-env 2> /dev/null >&2; then failure <<EOF Nix already appears to be installed, and this tool assumes it is _not_ yet installed. $(uninstall_directions) EOF fi if [ "${NIX_REMOTE:-}" != "" ]; then failure <<EOF For some reason, \$NIX_REMOTE is set. It really should not be set before this installer runs, and it hints that Nix is currently installed. Please delete the old Nix installation and start again. Note: You might need to close your shell window and open a new shell to clear the variable. EOF fi if echo "${SSL_CERT_FILE:-}" | grep -qE "(nix/var/nix|nix-profile)"; then failure <<EOF It looks like \$SSL_CERT_FILE is set to a path that used to be part of the old Nix installation. Please unset that variable and try again: $ unset SSL_CERT_FILE EOF fi for file in ~/.bash_profile ~/.bash_login ~/.profile ~/.zshenv ~/.zprofile ~/.zshrc ~/.zlogin; do if [ -f "$file" ]; then if grep -l "^[^#].*.nix-profile" "$file"; then failure <<EOF I found a reference to a ".nix-profile" in $file. This has a high chance of breaking a new nix installation. It was most likely put there by a previous Nix installer. Please remove this reference and try running this again. You should also look for similar references in: - ~/.bash_profile - ~/.bash_login - ~/.profile or other shell init files that you may have. $(uninstall_directions) EOF fi fi done if [ -d /nix ]; then failure <<EOF There are some relics of a previous installation of Nix at /nix, and this scripts assumes Nix is _not_ yet installed. Please delete the old Nix installation and start again. $(uninstall_directions) EOF fi if [ -d /etc/nix ]; then failure <<EOF There are some relics of a previous installation of Nix at /etc/nix, and this scripts assumes Nix is _not_ yet installed. Please delete the old Nix installation and start again. $(uninstall_directions) EOF fi for profile_target in "${PROFILE_TARGETS[@]}"; do if [ -e "$profile_target$PROFILE_BACKUP_SUFFIX" ]; then failure <<EOF When this script runs, it backs up the current $profile_target to $profile_target$PROFILE_BACKUP_SUFFIX. This backup file already exists, though. Please follow these instructions to clean up the old backup file: 1. Copy $profile_target and $profile_target$PROFILE_BACKUP_SUFFIX to another place, just in case. 2. Take care to make sure that $profile_target$PROFILE_BACKUP_SUFFIX doesn't look like it has anything nix-related in it. If it does, something is probably quite wrong. Please open an issue or get in touch immediately. 3. Take care to make sure that $profile_target doesn't look like it has anything nix-related in it. If it does, and $profile_target _did not_, run: $ /usr/bin/sudo /bin/mv $profile_target$PROFILE_BACKUP_SUFFIX $profile_target and try again. EOF fi if grep -qi "nix" "$profile_target"; then failure <<EOF It looks like $profile_target already has some Nix configuration in there. There should be no reason to run this again. If you're having trouble, please open an issue. EOF fi done danger_paths=("$ROOT_HOME/.nix-defexpr" "$ROOT_HOME/.nix-channels" "$ROOT_HOME/.nix-profile") for danger_path in "${danger_paths[@]}"; do if _sudo "making sure that $danger_path doesn't exist" \ test -e "$danger_path"; then failure <<EOF I found a file at $danger_path, which is a relic of a previous installation. You must first delete this file before continuing. $(uninstall_directions) EOF fi done } setup_report() { header "hardware report" row " Cores" "$CORES" header "Nix config report" row " Temp Dir" "$SCRATCH" row " Nix Root" "$NIX_ROOT" row " Build Users" "$NIX_USER_COUNT" row " Build Group ID" "$NIX_BUILD_GROUP_ID" row "Build Group Name" "$NIX_BUILD_GROUP_NAME" if [ "${ALLOW_PREEXISTING_INSTALLATION:-}" != "" ]; then row "Preexisting Install" "Allowed" fi subheader "build users:" row " Username" "UID" for i in $(seq 1 "$NIX_USER_COUNT"); do row " $(nix_user_for_core "$i")" "$(nix_uid_for_core "$i")" done echo "" } create_build_group() { local primary_group_id task "Setting up the build group $NIX_BUILD_GROUP_NAME" if ! /usr/bin/dscl . -read "/Groups/$NIX_BUILD_GROUP_NAME" > /dev/null 2>&1; then _sudo "Create the Nix build group, $NIX_BUILD_GROUP_NAME" \ /usr/sbin/dseditgroup -o create \ -r "Nix build group for nix-daemon" \ -i "$NIX_BUILD_GROUP_ID" \ "$NIX_BUILD_GROUP_NAME" >&2 row " Created" "Yes" else primary_group_id=$(dsclattr "/Groups/$NIX_BUILD_GROUP_NAME" "PrimaryGroupID") if [ "$primary_group_id" -ne "$NIX_BUILD_GROUP_ID" ]; then failure <<EOF It seems the build group $NIX_BUILD_GROUP_NAME already exists, but with the UID $primary_group_id. This script can't really handle that right now, so I'm going to give up. You can fix this by editing this script and changing the NIX_BUILD_GROUP_ID variable near the top to from $NIX_BUILD_GROUP_ID to $primary_group_id and re-run. EOF else row " Exists" "Yes" fi fi } create_build_user_for_core() { local coreid local username local uid coreid="$1" username=$(nix_user_for_core "$coreid") uid=$(nix_uid_for_core "$coreid") dsclpath="/Users/$username" task "Setting up the build user $username" if ! /usr/bin/dscl . -read "$dsclpath" > /dev/null 2>&1; then _sudo "Creating the Nix build user, $username" \ /usr/bin/dscl . create "$dsclpath" \ UniqueID "${uid}" row " Created" "Yes" else actual_uid=$(dsclattr "$dsclpath" "UniqueID") if [ "$actual_uid" -ne "$uid" ]; then failure <<EOF It seems the build user $username already exists, but with the UID with the UID $actual_uid. This script can't really handle that right now, so I'm going to give up. If you already created the users and you know they start from $actual_uid and go up from there, you can edit this script and change NIX_FIRST_BUILD_UID near the top of the file to $actual_uid and try again. EOF else row " Exists" "Yes" fi fi if [ "$(dsclattr "$dsclpath" "IsHidden")" = "1" ]; then row " IsHidden" "Yes" else _sudo "in order to make $username a hidden user" \ /usr/bin/dscl . -create "$dsclpath" "IsHidden" "1" row " IsHidden" "Yes" fi if [ "$(dsclattr "$dsclpath" "NFSHomeDirectory")" = "/var/empty" ]; then row " NFSHomeDirectory" "/var/empty" else _sudo "in order to give $username a safe home directory" \ /usr/bin/dscl . -create "$dsclpath" "NFSHomeDirectory" "/var/empty" row " NFSHomeDirectory" "/var/empty" fi if [ "$(dsclattr "$dsclpath" "RealName")" = "Nix build user $coreid" ]; then row " RealName" "Nix build user $coreid" else _sudo "in order to give $username a useful name" \ /usr/bin/dscl . -create "$dsclpath" "RealName" "Nix build user $coreid" row " RealName" "Nix build user $coreid" fi if [ "$(dsclattr "$dsclpath" "UserShell")" = "/sbin/nologin" ]; then row " Logins Disabled" "Yes" else _sudo "in order to prevent $username from logging in" \ /usr/bin/dscl . -create "$dsclpath" "UserShell" "/sbin/nologin" row " Logins Disabled" "Yes" fi if dseditgroup -o checkmember -m "$username" "$NIX_BUILD_GROUP_NAME" > /dev/null 2>&1 ; then row " Member of $NIX_BUILD_GROUP_NAME" "Yes" else _sudo "Add $username to the $NIX_BUILD_GROUP_NAME group"\ /usr/sbin/dseditgroup -o edit -t user \ -a "$username" "$NIX_BUILD_GROUP_NAME" row " Member of $NIX_BUILD_GROUP_NAME" "Yes" fi if [ "$(dsclattr "$dsclpath" "PrimaryGroupID")" = "$NIX_BUILD_GROUP_ID" ]; then row " PrimaryGroupID" "$NIX_BUILD_GROUP_ID" else _sudo "to let the nix daemon use this user for builds (this might seem redundant, but there are two concepts of group membership)" \ /usr/bin/dscl . -create "$dsclpath" "PrimaryGroupID" "$NIX_BUILD_GROUP_ID" row " PrimaryGroupID" "$NIX_BUILD_GROUP_ID" fi } create_build_users() { for i in $(seq 1 "$NIX_USER_COUNT"); do create_build_user_for_core "$i" done } create_directories() { _sudo "to make the basic directory structure of Nix (part 1)" \ mkdir -pv -m 0755 /nix /nix/var /nix/var/log /nix/var/log/nix /nix/var/log/nix/drvs /nix/var/nix{,/db,/gcroots,/profiles,/temproots,/userpool} _sudo "to make the basic directory structure of Nix (part 2)" \ mkdir -pv -m 1777 /nix/var/nix/{gcroots,profiles}/per-user _sudo "to make the basic directory structure of Nix (part 3)" \ mkdir -pv -m 1775 /nix/store _sudo "to make the basic directory structure of Nix (part 4)" \ chgrp "$NIX_BUILD_GROUP_NAME" /nix/store _sudo "to set up the root user's profile (part 1)" \ mkdir -pv -m 0755 /nix/var/nix/profiles/per-user/root _sudo "to set up the root user's profile (part 2)" \ mkdir -pv -m 0700 "$ROOT_HOME/.nix-defexpr" _sudo "to place the default nix daemon configuration (part 1)" \ mkdir -pv -m 0555 /etc/nix } place_channel_configuration() { echo "https://nixos.org/channels/nixpkgs-unstable nixpkgs" > "$SCRATCH/.nix-channels" _sudo "to set up the default system channel (part 1)" \ install -m 0664 "$SCRATCH/.nix-channels" "$ROOT_HOME/.nix-channels" } welcome_to_nix() { ok "Welcome to the Multi-User Nix Installation" cat <<EOF This installation tool will set up your computer with the Nix package manager. This will happen in a few stages: 1. Make sure your computer doesn't already have Nix. If it does, I will show you instructions on how to clean up your old one. 2. Show you what we are going to install and where. Then we will ask if you are ready to continue. 3. Create the system users and groups that the Nix daemon uses to run builds. 4. Perform the basic installation of the Nix files daemon. 5. Configure your shell to import special Nix Profile files, so you can use Nix. 6. Start the Nix daemon. EOF if ui_confirm "Would you like to see a more detailed list of what we will do?"; then cat <<EOF We will: - make sure your computer doesn't already have Nix files (if it does, I will tell you how to clean them up.) - create local users (see the list above for the users we'll make) - create a local group ($NIX_BUILD_GROUP_NAME) - install Nix in to $NIX_ROOT - create a configuration file in /etc/nix - set up the "default profile" by creating some Nix-related files in $ROOT_HOME EOF for profile_target in "${PROFILE_TARGETS[@]}"; do if [ -e "$profile_target" ]; then cat <<EOF - back up $profile_target to $profile_target$PROFILE_BACKUP_SUFFIX - update $profile_target to include some Nix configuration EOF fi done cat <<EOF - load and start a LaunchDaemon (at $PLIST_DEST) for nix-daemon EOF if ! ui_confirm "Ready to continue?"; then failure <<EOF Okay, maybe you would like to talk to the team. EOF fi fi } chat_about_sudo() { header "let's talk about sudo" if headless; then cat <<EOF This script is going to call sudo a lot. Normally, it would show you exactly what commands it is running and why. However, the script is run in a headless fashion, like this: $ curl https://nixos.org/nix/install | sh or maybe in a CI pipeline. Because of that, we're going to skip the verbose output in the interest of brevity. If you would like to see the output, try like this: $ curl -o install-nix https://nixos.org/nix/install $ sh ./install-nix EOF return 0 fi cat <<EOF This script is going to call sudo a lot. Every time we do, it'll output exactly what it'll do, and why. Just like this: EOF __sudo "to demonstrate how our sudo prompts look" \ echo "this is a sudo prompt" cat <<EOF This might look scary, but everything can be undone by running just a few commands. We used to ask you to confirm each time sudo ran, but it was too many times. Instead, I'll just ask you this one time: EOF if ui_confirm "Can we use sudo?"; then ok "Yay! Thanks! Let's get going!" else failure <<EOF That is okay, but we can't install. EOF fi } install_from_extracted_nix() { ( cd "$EXTRACTED_NIX_PATH" _sudo "to copy the basic Nix files to the new store at $NIX_ROOT/store" \ rsync -rlpt "$(pwd)/store/" "$NIX_ROOT/store/" if [ -d "$NIX_INSTALLED_NIX" ]; then echo " Alright! We have our first nix at $NIX_INSTALLED_NIX" else failure <<EOF Something went wrong, and I didn't find Nix installed at $NIX_INSTALLED_NIX. EOF fi _sudo "to initialize the Nix Database" \ $NIX_INSTALLED_NIX/bin/nix-store --init cat ./.reginfo \ | _sudo "to load data for the first time in to the Nix Database" \ "$NIX_INSTALLED_NIX/bin/nix-store" --load-db echo " Just finished getting the nix database ready." ) } shell_source_lines() { cat <<EOF # Nix if [ -e '$PROFILE_NIX_FILE' ]; then . '$PROFILE_NIX_FILE' fi # End Nix EOF } configure_shell_profile() { for profile_target in "${PROFILE_TARGETS[@]}"; do if [ -e "$profile_target" ]; then _sudo "to back up your current $profile_target to $profile_target$PROFILE_BACKUP_SUFFIX" \ cp "$profile_target" "$profile_target$PROFILE_BACKUP_SUFFIX" shell_source_lines \ | _sudo "extend your $profile_target with nix-daemon settings" \ tee -a "$profile_target" fi done } setup_default_profile() { _sudo "to installing a bootstrapping Nix in to the default Profile" \ HOME=$ROOT_HOME "$NIX_INSTALLED_NIX/bin/nix-env" -i "$NIX_INSTALLED_NIX" _sudo "to installing a bootstrapping SSL certificate just for Nix in to the default Profile" \ HOME=$ROOT_HOME "$NIX_INSTALLED_NIX/bin/nix-env" -i "$NIX_INSTALLED_CACERT" _sudo "to update the default channel in the default profile" \ HOME=$ROOT_HOME NIX_SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt "$NIX_INSTALLED_NIX/bin/nix-channel" --update nixpkgs } place_nix_configuration() { cat <<EOF > "$SCRATCH/nix.conf" build-users-group = $NIX_BUILD_GROUP_NAME max-jobs = $NIX_USER_COUNT cores = 1 sandbox = false EOF _sudo "to place the default nix daemon configuration (part 2)" \ install -m 0664 "$SCRATCH/nix.conf" /etc/nix/nix.conf } configure_nix_daemon_plist() { _sudo "to set up the nix-daemon as a LaunchDaemon" \ ln -sfn "/nix/var/nix/profiles/default$PLIST_DEST" "$PLIST_DEST" _sudo "to load the LaunchDaemon plist for nix-daemon" \ launchctl load /Library/LaunchDaemons/org.nixos.nix-daemon.plist _sudo "to start the nix-daemon" \ launchctl start org.nixos.nix-daemon } main() { welcome_to_nix chat_about_sudo if [ "${ALLOW_PREEXISTING_INSTALLATION:-}" = "" ]; then validate_starting_assumptions fi setup_report if ! ui_confirm "Ready to continue?"; then ok "Alright, no changes have been made :)" contactme trap finish_cleanup EXIT exit 1 fi create_build_group create_build_users create_directories place_channel_configuration install_from_extracted_nix configure_shell_profile set +eu . /etc/profile set -eu setup_default_profile place_nix_configuration configure_nix_daemon_plist trap finish_success EXIT } main