From c769beaddf66bc2301a595fda97195726898a9de Mon Sep 17 00:00:00 2001 From: Eric Litak Date: Mon, 14 Mar 2016 02:59:18 -0700 Subject: [PATCH] mostly docs --- nixos-infect | 91 ++++++++++++++++++++++++++++++++++------------------ 1 file changed, 59 insertions(+), 32 deletions(-) diff --git a/nixos-infect b/nixos-infect index 20de439..1a1caca 100755 --- a/nixos-infect +++ b/nixos-infect @@ -1,56 +1,83 @@ #! /usr/bin/env bash -set -e + +# WARNING NB This script wipes out the targeted host's root filesystem when it +# runs to completion. Any errors halt execution. set -x is used to help debug, +# as often a failed run leaves the system in an inconsistent state, requiring a +# rebuild (in DigitalOcean panel: Droplet Settings -> "Destroy" -> "Rebuild +# from original"). +# +# TO USE: +# - Add any custom config you want (see notes below) +# - Deploy a Debian 8.3 x64 droplet (enable ipv6; add your ssh key) +# - cat customConfig.optional nixos-infect | ssh root@targethost bash +# +# This was last tested with the DigitalOcean Debian 8.3 x64 image. Different +# versions as well as the Ubuntu images should work as well, but then, there's +# not much point in selecting something different if you intend to wipe out the +# fs as this does. You may need to make minor modifications to use in other +# templates, but basically all that will ever need tweaking should be: +# /etc/nixos/{,hardware-}configuration.nix, inline in this file +# /etc/nixso/networking.nix, generated at runtime (no ipv6? different number of adapters?) +# +# Motivation: nixos-assimilate should supplant this script entirely, if it's +# ever completed. nixos-in-place was quite broken when I tried it, and also +# took a pretty janky approach that was substantially more complex than this +# (although it supported more platforms): it didn't install to root (/nixos +# instead), left dregs of the old filesystem (almost always unnecessary since +# starting from a fresh deployment), and most importantly, simply didn't work for +# me! (old system was being because grub wasnt properly reinstalled) + +set -ex makeConf() { -# XXX NB remember to escape / $ ` in heredocs! -# TODO use appended archive or some curl-able tarball? -mkdir -p /etc/nixos/shared -cat > /etc/nixos/networking.nix < /etc/nixos/networking.nix << EOF # This file will be populated at runtime with the # networking details gathered from the active system. {...}:{} EOF -cat > /etc/nixos/configuration.nix < /etc/nixos/configuration.nix << EOF { config, pkgs, ... }: { imports = [ ./hardware-configuration.nix ./networking.nix - #./shared/essentials.nix - #./shared/user-settings.nix ]; - networking.hostName = "$(hostname)"; time.timeZone = "America/Los_Angeles"; boot.cleanTmpDir = true; - services.openssh.enable = true; services.tlsdated.enable = true; - #services.tlsdated.extraOptions = ""; # BUG fixed in unstable - + services.openssh.enable = true; networking.firewall.allowPing = true; + networking.hostName = "$(hostname)"; + users.users.root.openssh.authorizedKeys.keys = [ '' + $(cat /root/.ssh/authorized_keys | head -n1) + '' ]; } EOF -# (nixos-generate-config will add qemu-user and bind-mounts, so avoid) -cat > /etc/nixos/hardware-configuration.nix < /etc/nixos/hardware-configuration.nix << EOF { config, lib, pkgs, ... }: { imports = [ ]; boot.loader.grub.devices = [ "/dev/vda" ]; fileSystems."/" = { device = "/dev/vda1"; fsType = "ext4"; }; } 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 + #! /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() { @@ -63,7 +90,7 @@ makeSwap() { } makeConf -makeSwap # TODO check if actually needed? seem to recall smallest size would die. +makeSwap # smallest (512MB) droplet needs extra memory! apt-get install -y curl sudo rsync @@ -100,8 +127,7 @@ swapoff /swap mount -B / $oldRootMount rsync -a --delete --exclude=$(dirname $newRootMount) $newRootMount/ $oldRootMount -# restore access to commands (TODO not sure whih of these 3 are essential, nor if order matters XXX) -export PATH=/nix/var/nix/profiles/system/sw/bin:/nix/var/nix/profiles/system/sw/sbin +# restore access to commands /nix/var/nix/profiles/system/activate source /nix/var/nix/profiles/system/etc/profile @@ -115,7 +141,7 @@ gateway6=$(ip -6 route show dev eth0 | grep default | sed -r 's|default via ([0- ether0=$(ip address show dev eth0 | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|') ether1=$(ip address show dev eth1 | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|') -cat > /etc/nixos/networking.nix < /etc/nixos/networking.nix << EOF { config, pkgs, ... }: { networking = { nameservers = [ "8.8.4.4" ]; @@ -129,7 +155,7 @@ cat > /etc/nixos/networking.nix <