#! /usr/bin/env bash # More info at: https://github.com/elitak/nixos-infect set -e -o pipefail makeConf() { # Skip everything if main config already present [[ -e /etc/nixos/configuration.nix ]] && return 0 # NB <<"EOF" quotes / $ ` in heredocs, < /etc/nixos/configuration.nix << EOF { ... }: { imports = [ ./hardware-configuration.nix $network_import $NIXOS_IMPORT ]; boot.cleanTmpDir = true; networking.hostName = "$(hostname)"; networking.firewall.allowPing = true; services.openssh.enable = true; users.users.root.openssh.authorizedKeys.keys = [$(while read -r line; do echo -n " \"$line\" "; done <<< "$keys") ]; } EOF # If you rerun this later, be sure to prune the filesSystems attr cat > /etc/nixos/hardware-configuration.nix << EOF { ... }: { imports = [ ]; boot.loader.grub.device = "$grubdev"; fileSystems."/" = { device = "$rootfsdev"; fsType = "ext4"; }; } EOF if [ ! -z "$doNetConf" ] then makeNetworkingConf else true fi } makeNetworkingConf() { # XXX It'd be better if we used procfs for all this... local IFS=$'\n' eth0_name=$(ip address show | grep '^2:' | awk -F': ' '{print $2}') eth0_ip4s=$(ip address show dev "$eth0_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|') eth0_ip6s=$(ip address show dev "$eth0_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '') gateway=$(ip route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9.]+).*|\1|') gateway6=$(ip -6 route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9a-f:]+).*|\1|' || true) ether0=$(ip address show dev "$eth0_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|') eth1_name=$(ip address show | grep '^3:' | awk -F': ' '{print $2}')||true if [ -n "$eth1_name" ];then eth1_ip4s=$(ip address show dev "$eth1_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|') eth1_ip6s=$(ip address show dev "$eth1_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '') ether1=$(ip address show dev "$eth1_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|') interfaces1=<< EOF $eth1_name = { ipv4.addresses = [$(for a in "${eth1_ip4s[@]}"; do echo -n " $a"; done) ]; ipv6.addresses = [$(for a in "${eth1_ip6s[@]}"; do echo -n " $a"; done) ]; EOF extraRules1="ATTR{address}==\"${ether1}\", NAME=\"${eth1_name}\"" else interfaces1="" extraRules1="" fi nameservers=($(grep ^nameserver /etc/resolv.conf | cut -f2 -d' ')) if [ "$eth0_name" = eth* ]; then predictable_inames="usePredictableInterfaceNames = lib.mkForce false;" else predictable_inames="usePredictableInterfaceNames = lib.mkForce true;" fi cat > /etc/nixos/networking.nix << EOF { lib, ... }: { # This file was populated at runtime with the networking # details gathered from the active system. networking = { nameservers = [ "8.8.8.8" ]; defaultGateway = "${gateway}"; defaultGateway6 = "${gateway6}"; dhcpcd.enable = false; $predictable_inames interfaces = { $eth0_name = { ipv4.addresses = [$(for a in "${eth0_ip4s[@]}"; do echo -n " $a"; done) ]; ipv6.addresses = [$(for a in "${eth0_ip6s[@]}"; do echo -n " $a"; done) ]; ipv4.routes = [ { address = "${gateway}"; prefixLength = 32; } ]; ipv6.routes = [ { address = "${gateway6}"; prefixLength = 32; } ]; }; $interfaces1 }; }; services.udev.extraRules = '' ATTR{address}=="${ether0}", NAME="${eth0_name}" $extraRules1 ''; } EOF #! /usr/bin/env bash # NB put your semi-sensitive (not posted to github) configuration in a separate # file and include it via this customConfig() function. e.g.: # customConfig() { # cat > /etc/nixos/custom.nix << EOF # { config, lib, pkgs, ... }: { # } # EOF # } # # then you can add the files in configuration.nix's imports above and run something like: # cat customConfig nixos-infect | root@targethost bash if [[ "$(type -t customConfig)" == "function" ]]; then customConfig; fi } makeSwap() { # TODO check currently available swapspace first swapFile=$(mktemp /tmp/nixos-infect.XXXXX.swp) dd if=/dev/zero "of=$swapFile" bs=1M count=$((1*1024)) chmod 0600 "$swapFile" mkswap "$swapFile" swapon -v "$swapFile" } removeSwap() { swapoff -a rm -vf /tmp/nixos-infect.*.swp } prepareEnv() { # $grubdev is used in makeConf() for grubdev in /dev/vda /dev/sda; do [[ -e $grubdev ]] && break; done # Retrieve root fs block device # (get root mount) (get partition or logical volume) rootfsdev=$(mount | grep "on / type" | awk '{print $1;}') # DigitalOcean doesn't seem to set USER while running user data export USER="root" export HOME="/root" # Nix installer tries to use sudo regardless of whether we're already uid 0 #which sudo || { sudo() { eval "$@"; }; export -f sudo; } # shellcheck disable=SC2174 mkdir -p -m 0755 /nix } fakeCurlUsingWget() { # Use adapted wget if curl is missing which wget && { \ curl() { eval "wget $( (local isStdout=1 for arg in "$@"; do case "$arg" in "-o") echo "-O"; isStdout=0 ;; "-O") isStdout=0 ;; "-L") ;; *) echo "$arg" ;; esac done; [[ $isStdout -eq 1 ]] && echo "-O-" )| tr '\n' ' ' )" }; export -f curl; } } req() { type "$1" > /dev/null 2>&1 || which "$1" > /dev/null 2>&1 } checkEnv() { # Perform some easy fixups before checking # TODO prevent multiple calls to apt-get update which dnf && dnf install -y perl-Digest-SHA # Fedora 24 which bzcat || (which yum && yum install -y bzip2) \ || (which apt-get && apt-get update && apt-get install -y bzip2) \ || true which curl || fakeCurlUsingWget \ || (which apt-get && apt-get update && apt-get install -y curl) \ || true [[ "$(whoami)" == "root" ]] || { echo "ERROR: Must run as root"; return 1; } req curl || req wget || { echo "ERROR: Missing both curl and wget"; return 1; } req bzcat || { echo "ERROR: Missing bzcat"; return 1; } req groupadd || { echo "ERROR: Missing groupadd"; return 1; } req useradd || { echo "ERROR: Missing useradd"; return 1; } req ip || { echo "ERROR: Missing ip"; return 1; } req awk || { echo "ERROR: Missing awk"; return 1; } req cut || { echo "ERROR: Missing cut"; return 1; } } infect() { # Add nix build users # FIXME run only if necessary, rather than defaulting true groupadd nixbld -g 30000 || true for i in {1..10}; do useradd -c "Nix build user $i" -d /var/empty -g nixbld -G nixbld -M -N -r -s "$(which nologin)" nixbld$i || true; done # TODO use addgroup and adduser as fallbacks #addgroup nixbld -g 30000 || true #for i in {1..10}; do adduser -DH -G nixbld nixbld$i || true; done curl -L https://nixos.org/nix/install | $SHELL # shellcheck disable=SC1090 source ~/.nix-profile/etc/profile.d/nix.sh [[ -z "$NIX_CHANNEL" ]] && NIX_CHANNEL="nixos-19.09" nix-channel --remove nixpkgs nix-channel --add "https://nixos.org/channels/$NIX_CHANNEL" nixos nix-channel --update export NIXOS_CONFIG=/etc/nixos/configuration.nix nix-env --set \ -I nixpkgs=$HOME/.nix-defexpr/channels/nixos \ -f '' \ -p /nix/var/nix/profiles/system \ -A system # Remove nix installed with curl | bash rm -fv /nix/var/nix/profiles/default* /nix/var/nix/profiles/system/sw/bin/nix-collect-garbage # Reify resolv.conf [[ -L /etc/resolv.conf ]] && mv -v /etc/resolv.conf /etc/resolv.conf.lnk && cat /etc/resolv.conf.lnk > /etc/resolv.conf # Stage the Nix coup d'état touch /etc/NIXOS echo etc/nixos > /etc/NIXOS_LUSTRATE echo etc/resolv.conf >> /etc/NIXOS_LUSTRATE echo root/.nix-defexpr/channels >> /etc/NIXOS_LUSTRATE rm -rf /boot.bak mv -v /boot /boot.bak /nix/var/nix/profiles/system/bin/switch-to-configuration boot } [ "$PROVIDER" = "digitalocean" ] && doNetConf=y # digitalocean requires detailed network config to be generated prepareEnv makeSwap # smallest (512MB) droplet needs extra memory! checkEnv makeConf infect removeSwap if [[ -z "$NO_REBOOT" ]]; then reboot fi