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#!/usr/bin/env bash
set -eu
set -o pipefail
readonly SERVICE_SRC=/lib/systemd/system/nix-daemon.service
readonly SERVICE_DEST=/etc/systemd/system/nix-daemon.service
readonly SOCKET_SRC=/lib/systemd/system/nix-daemon.socket
readonly SOCKET_DEST=/etc/systemd/system/nix-daemon.socket
poly_validate_assumptions() {
if [ "$(uname -s)" != "Linux" ]; then
failure "This script is for use with Linux!"
fi
}
poly_service_installed_check() {
[ "$(systemctl is-enabled nix-daemon.service)" = "linked" ] \
|| [ "$(systemctl is-enabled nix-daemon.socket)" = "enabled" ]
}
poly_service_uninstall_directions() {
cat <<EOF
$1. Delete the systemd service and socket units
sudo systemctl stop nix-daemon.socket
sudo systemctl stop nix-daemon.service
sudo systemctl disable nix-daemon.socket
sudo systemctl disable nix-daemon.service
sudo systemctl daemon-reload
EOF
}
poly_service_setup_note() {
cat <<EOF
- load and start a service (at $SERVICE_DEST
and $SOCKET_DEST) for nix-daemon
EOF
}
poly_configure_nix_daemon_service() {
_sudo "to set up the nix-daemon service" \
systemctl link "/nix/var/nix/profiles/default$SERVICE_SRC"
_sudo "to set up the nix-daemon socket service" \
systemctl enable "/nix/var/nix/profiles/default$SOCKET_SRC"
_sudo "to load the systemd unit for nix-daemon" \
systemctl daemon-reload
_sudo "to start the nix-daemon.socket" \
systemctl start nix-daemon.socket
_sudo "to start the nix-daemon.service" \
systemctl start nix-daemon.service
}
poly_group_exists() {
getent group "$1" > /dev/null 2>&1
}
poly_group_id_get() {
getent group "$1" | cut -d: -f3
}
poly_create_build_group() {
_sudo "Create the Nix build group, $NIX_BUILD_GROUP_NAME" \
groupadd -g "$NIX_BUILD_GROUP_ID" --system \
"$NIX_BUILD_GROUP_NAME" >&2
}
poly_user_exists() {
getent passwd "$1" > /dev/null 2>&1
}
poly_user_id_get() {
getent passwd "$1" | cut -d: -f3
}
poly_user_hidden_get() {
echo "1"
}
poly_user_hidden_set() {
true
}
poly_user_home_get() {
getent passwd "$1" | cut -d: -f6
}
poly_user_home_set() {
_sudo "in order to give $1 a safe home directory" \
usermod --home "$2" "$1"
}
poly_user_note_get() {
getent passwd "$1" | cut -d: -f5
}
poly_user_note_set() {
_sudo "in order to give $1 a useful comment" \
usermod --comment "$2" "$1"
}
poly_user_shell_get() {
getent passwd "$1" | cut -d: -f7
}
poly_user_shell_set() {
_sudo "in order to prevent $1 from logging in" \
usermod --shell "$2" "$1"
}
poly_user_in_group_check() {
groups "$1" | grep -q "$2" > /dev/null 2>&1
}
poly_user_in_group_set() {
_sudo "Add $1 to the $2 group"\
usermod --append --groups "$2" "$1"
}
poly_user_primary_group_get() {
getent passwd "$1" | cut -d: -f4
}
poly_user_primary_group_set() {
_sudo "to let the nix daemon use this user for builds (this might seem redundant, but there are two concepts of group membership)" \
usermod --gid "$2" "$1"
}
poly_create_build_user() {
username=$1
uid=$2
builder_num=$3
_sudo "Creating the Nix build user, $username" \
useradd \
--home-dir /var/empty \
--comment "Nix build user $builder_num" \
--gid "$NIX_BUILD_GROUP_ID" \
--groups "$NIX_BUILD_GROUP_NAME" \
--no-user-group \
--system \
--shell /sbin/nologin \
--uid "$uid" \
--password "!" \
"$username"
}
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