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Diffstat (limited to 'scripts/install-multi-user.sh')
| -rw-r--r-- | scripts/install-multi-user.sh | 797 |
1 files changed, 797 insertions, 0 deletions
diff --git a/scripts/install-multi-user.sh b/scripts/install-multi-user.sh new file mode 100644 index 000000000000..5f6542355e0c --- /dev/null +++ b/scripts/install-multi-user.sh @@ -0,0 +1,797 @@ +#!/usr/bin/env 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 NIX_USER_COUNT="32" +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 PROFILE_TARGETS=("/etc/bashrc" "/etc/profile.d/nix.sh" "/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 "$0")" + +readonly ROOT_HOME=$(echo ~root) + +if [ -t 0 ]; then + readonly IS_HEADLESS='no' +else + readonly IS_HEADLESS='yes' +fi + +headless() { + if [ "$IS_HEADLESS" = "yes" ]; then + return 0 + else + return 1 + fi +} + +contactme() { + echo "We'd love to help if you need it." + echo "" + echo "If you can, open an issue at https://github.com/nixos/nix/issues" + echo "" + echo "Or feel free to contact the team," + echo " - on IRC #nixos on irc.freenode.net" + echo " - on twitter @nixos_org" +} + +uninstall_directions() { + subheader "Uninstalling nix:" + local step=0 + + if poly_service_installed_check; then + step=$((step + 1)) + poly_service_uninstall_directions "$step" + fi + + for profile_target in "${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)) +} + +_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() { + poly_validate_assumptions + + 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 $profile_target + +and try again. +EOF + fi + + if [ -e "$profile_target" ] && 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 "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 $NIX_BUILD_GROUP_NAME" + if ! poly_group_exists "$NIX_BUILD_GROUP_NAME"; then + poly_create_build_group + row " Created" "Yes" + else + primary_group_id=$(poly_group_id_get "$NIX_BUILD_GROUP_NAME") + 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") + + task "Setting up the build user $username" + + if ! poly_user_exists "$username"; then + poly_create_build_user "$username" "$uid" "$coreid" + row " Created" "Yes" + else + actual_uid=$(poly_user_id_get "$username") + if [ "$actual_uid" != "$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 $actual_uid and try +again. +EOF + else + row " Exists" "Yes" + fi + fi + + if [ "$(poly_user_hidden_get "$username")" = "1" ]; then + row " Hidden" "Yes" + else + poly_user_hidden_set "$username" + row " Hidden" "Yes" + fi + + if [ "$(poly_user_home_get "$username")" = "/var/empty" ]; then + row " Home Directory" "/var/empty" + else + poly_user_home_set "$username" "/var/empty" + row " Home Directory" "/var/empty" + fi + + # We use grep instead of an equality check because it is difficult + # to extract _just_ the user's note, instead it is prefixed with + # some plist junk. This was causing the user note to always be set, + # even if there was no reason for it. + if ! poly_user_note_get "$username" | grep -q "Nix build user $coreid"; then + row " Note" "Nix build user $coreid" + else + poly_user_note_set "$username" "Nix build user $coreid" + row " Note" "Nix build user $coreid" + fi + + if [ "$(poly_user_shell_get "$username")" = "/sbin/nologin" ]; then + row " Logins Disabled" "Yes" + else + poly_user_shell_set "$username" "/sbin/nologin" + row " Logins Disabled" "Yes" + fi + + if poly_user_in_group_check "$username" "$NIX_BUILD_GROUP_NAME"; then + row " Member of $NIX_BUILD_GROUP_NAME" "Yes" + else + poly_user_in_group_set "$username" "$NIX_BUILD_GROUP_NAME" + row " Member of $NIX_BUILD_GROUP_NAME" "Yes" + fi + + if [ "$(poly_user_primary_group_get "$username")" = "$NIX_BUILD_GROUP_ID" ]; then + row " PrimaryGroupID" "$NIX_BUILD_GROUP_ID" + else + poly_user_primary_group_set "$username" "$NIX_BUILD_GROUP_ID" + row " PrimaryGroupID" "$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 + poly_service_setup_note + 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 $NIX_ROOT/store" \ + rsync -rlpt ./store/* "$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() { + # If there is an /etc/profile.d directory, we want to ensure there + # is a nix.sh within it, so we can use the following loop to add + # the source lines to it. Note that I'm _not_ adding the source + # lines here, because we want to be using the regular machinery. + # + # If we go around that machinery, it becomes more complicated and + # adds complications to the uninstall instruction generator and + # old instruction sniffer as well. + if [ -d /etc/profile.d ]; then + _sudo "create a stub /etc/profile.d/nix.sh which will be updated" \ + touch /etc/profile.d/nix.sh + fi + + 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 +} + +main() { + if [ "$(uname -s)" = "Darwin" ]; then + # shellcheck source=./install-darwin-multi-user.sh + . "$EXTRACTED_NIX_PATH/install-darwin-multi-user.sh" + elif [ "$(uname -s)" = "Linux" ] && [ -e /run/systemd/system ]; then + # shellcheck source=./install-systemd-multi-user.sh + . "$EXTRACTED_NIX_PATH/install-systemd-multi-user.sh" + else + failure "Sorry, I don't know what to do on $(uname)" + fi + + welcome_to_nix + chat_about_sudo + + if [ "${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 + poly_configure_nix_daemon_service + + trap finish_success EXIT +} + + +main |