mirror of
https://github.com/elitak/nixos-infect
synced 2024-11-22 03:03:11 +00:00
1f8634dd48
During my nixos-infect tests I have sometimes canceled infection in the middle. Rerun of nixos-infect failed because there were some old swap files, which were no longer available as swap devices. `swapoff -a` will handle this for us (we are going reboot anyway)
247 lines
8.1 KiB
Bash
Executable file
247 lines
8.1 KiB
Bash
Executable file
#! /usr/bin/env bash
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# More info at: https://github.com/elitak/nixos-infect
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set -e -o pipefail
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makeConf() {
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# Skip everything if main config already present
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[[ -e /etc/nixos/configuration.nix ]] && return 0
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# NB <<"EOF" quotes / $ ` in heredocs, <<EOF does not
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mkdir -p /etc/nixos
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local IFS=$'\n'; keys=($(grep -vE '^[[:space:]]*(#|$)' /root/.ssh/authorized_keys))
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cat > /etc/nixos/configuration.nix << EOF
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{ ... }: {
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imports = [
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./hardware-configuration.nix
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./networking.nix # generated at runtime by nixos-infect
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$NIXOS_IMPORT
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];
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boot.cleanTmpDir = true;
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networking.hostName = "$(hostname)";
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networking.firewall.allowPing = true;
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services.openssh.enable = true;
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users.users.root.openssh.authorizedKeys.keys = [$(for key in "${keys[@]}"; do echo -n "
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\"$key\""; done)
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];
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}
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EOF
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# If you rerun this later, be sure to prune the filesSystems attr
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cat > /etc/nixos/hardware-configuration.nix << EOF
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{ ... }:
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{
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imports = [ <nixpkgs/nixos/modules/profiles/qemu-guest.nix> ];
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boot.loader.grub.device = "/dev/$disk";
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fileSystems."/" = { device = "/dev/${disk}1"; fsType = "ext4"; };
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}
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EOF
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# XXX It'd be better if we used procfs for all this...
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local IFS=$'\n'
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eth0_name=$(ip address show | grep '^2:' | awk -F': ' '{print $2}')
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eth0_ip4s=$(ip address show dev "$eth0_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
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eth0_ip6s=$(ip address show dev "$eth0_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '')
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gateway=$(ip route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9.]+).*|\1|')
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gateway6=$(ip -6 route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9a-f:]+).*|\1|' || true)
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ether0=$(ip address show dev "$eth0_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')
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eth1_name=$(ip address show | grep '^3:' | awk -F': ' '{print $2}')||true
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if [ -n "$eth1_name" ];then
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eth1_ip4s=$(ip address show dev "$eth1_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
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eth1_ip6s=$(ip address show dev "$eth1_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '')
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ether1=$(ip address show dev "$eth1_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')
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interfaces1=<< EOF
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$eth1_name = {
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ipv4.addresses = [$(for a in "${eth1_ip4s[@]}"; do echo -n "
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$a"; done)
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];
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ipv6.addresses = [$(for a in "${eth1_ip6s[@]}"; do echo -n "
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$a"; done)
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];
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EOF
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extraRules1="ATTR{address}==\"${ether1}\", NAME=\"${eth1_name}\""
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else
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interfaces1=""
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extraRules1=""
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fi
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nameservers=($(grep ^nameserver /etc/resolv.conf | cut -f2 -d' '))
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if [ "$eth0_name" = eth* ]; then
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predictable_inames="usePredictableInterfaceNames = lib.mkForce false;"
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else
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predictable_inames="usePredictableInterfaceNames = lib.mkForce true;"
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fi
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cat > /etc/nixos/networking.nix << EOF
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{ lib, ... }: {
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# This file was populated at runtime with the networking
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# details gathered from the active system.
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networking = {
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nameservers = [$(for a in "${nameservers[@]}"; do echo -n "
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\"$a\""; done)
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];
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defaultGateway = "${gateway}";
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defaultGateway6 = "${gateway6}";
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dhcpcd.enable = false;
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$predictable_inames
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interfaces = {
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$eth0_name = {
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ipv4.addresses = [$(for a in "${eth0_ip4s[@]}"; do echo -n "
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$a"; done)
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];
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ipv6.addresses = [$(for a in "${eth0_ip6s[@]}"; do echo -n "
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$a"; done)
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];
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};
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$interfaces1
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};
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};
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services.udev.extraRules = ''
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ATTR{address}=="${ether0}", NAME="${eth0_name}"
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$extraRules1
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'';
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}
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EOF
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#! /usr/bin/env bash
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# NB put your semi-sensitive (not posted to github) configuration in a separate
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# file and include it via this customConfig() function. e.g.:
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# customConfig() {
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# cat > /etc/nixos/custom.nix << EOF
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# { config, lib, pkgs, ... }: {
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# }
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# EOF
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# }
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#
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# then you can add the files in configuration.nix's imports above and run something like:
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# cat customConfig nixos-infect | root@targethost bash
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if [[ "$(type -t customConfig)" == "function" ]]; then customConfig; fi
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}
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makeSwap() {
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# TODO check currently available swapspace first
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swapFile=$(mktemp /tmp/nixos-infect.XXXXX.swp)
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dd if=/dev/zero "of=$swapFile" bs=1M count=$((1*1024))
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chmod 0600 "$swapFile"
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mkswap "$swapFile"
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swapon -v "$swapFile"
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}
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removeSwap() {
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swapoff -a
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rm -vf /tmp/nixos-infect.*.swp
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}
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prepareEnv() {
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# $disk is used in makeConf()
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for disk in vda sda; do [[ -e /dev/$disk ]] && break; done
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# DigitalOcean doesn't seem to set USER while running user data
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export USER="root"
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export HOME="/root"
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# Use adapted wget if curl is missing
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which curl || { \
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curl() {
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eval "wget $(
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(local isStdout=1
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for arg in "$@"; do
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case "$arg" in
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"-o")
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echo "-O";
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isStdout=0
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;;
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"-O")
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isStdout=0
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;;
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"-L")
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;;
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*)
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echo "$arg"
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;;
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esac
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done;
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[[ $isStdout -eq 1 ]] && echo "-O-"
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)| tr '\n' ' '
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)"
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}; export -f curl; }
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# Nix installer tries to use sudo regardless of whether we're already uid 0
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#which sudo || { sudo() { eval "$@"; }; export -f sudo; }
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# shellcheck disable=SC2174
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mkdir -p -m 0755 /nix
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}
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req() {
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type "$1" > /dev/null 2>&1 || which "$1" > /dev/null 2>&1
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}
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checkEnv() {
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# Perform some easy fixups before checking
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which dnf && dnf install -y perl-Digest-SHA # Fedora 24
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which bzcat || (which yum && yum install -y bzip2) \
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|| (which apt-get && apt-get install bzip2) \
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|| true
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[[ "$(whoami)" == "root" ]] || { echo "ERROR: Must run as root"; return 1; }
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req curl || req wget || { echo "ERROR: Missing both curl and wget"; return 1; }
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req bzcat || { echo "ERROR: Missing bzcat"; return 1; }
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req groupadd || { echo "ERROR: Missing groupadd"; return 1; }
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req useradd || { echo "ERROR: Missing useradd"; return 1; }
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req ip || { echo "ERROR: Missing ip"; return 1; }
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req awk || { echo "ERROR: Missing awk"; return 1; }
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req cut || { echo "ERROR: Missing cut"; return 1; }
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}
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infect() {
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# Add nix build users
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# FIXME run only if necessary, rather than defaulting true
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groupadd nixbld -g 30000 || true
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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$i || true; done
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# TODO use addgroup and adduser as fallbacks
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#addgroup nixbld -g 30000 || true
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#for i in {1..10}; do adduser -DH -G nixbld nixbld$i || true; done
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curl https://nixos.org/nix/install | $SHELL
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# shellcheck disable=SC1090
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source ~/.nix-profile/etc/profile.d/nix.sh
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[[ -z "$NIX_CHANNEL" ]] && NIX_CHANNEL="nixos-18.03"
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nix-channel --remove nixpkgs
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nix-channel --add "https://nixos.org/channels/$NIX_CHANNEL" nixos
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nix-channel --update
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export NIXOS_CONFIG=/etc/nixos/configuration.nix
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nix-env --set \
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-I nixpkgs=$HOME/.nix-defexpr/channels/nixos \
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-f '<nixpkgs/nixos>' \
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-p /nix/var/nix/profiles/system \
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-A system
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# Remove nix installed with curl | bash
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rm -fv /nix/var/nix/profiles/default*
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/nix/var/nix/profiles/system/sw/bin/nix-collect-garbage
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# Reify resolv.conf
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[[ -L /etc/resolv.conf ]] && mv -v /etc/resolv.conf /etc/resolv.conf.lnk && cat /etc/resolv.conf.lnk > /etc/resolv.conf
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# Stage the Nix coup d'état
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touch /etc/NIXOS
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echo etc/nixos > /etc/NIXOS_LUSTRATE
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echo etc/resolv.conf >> /etc/NIXOS_LUSTRATE
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echo root/.nix-defexpr/channels >> /etc/NIXOS_LUSTRATE
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rm -rf /boot.bak
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mv -v /boot /boot.bak
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/nix/var/nix/profiles/system/bin/switch-to-configuration boot
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}
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prepareEnv
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checkEnv
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makeConf
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makeSwap # smallest (512MB) droplet needs extra memory!
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infect
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removeSwap
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reboot
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