Add support for AWS Lightsail (#125)

Co-authored-by: Eric Litak <elitak@gmail.com>

README.md

@@ -19,6 +19,7 @@ This script has successfully been tested on at least the follow hosting provider
 * [Cockbox](https://cockbox.org)
 * [Google Cloud Platform](https://cloud.google.com/)
 * [Contabo](https://contabo.com)
+* [AWS Lightsail](https://aws.amazon.com/lightsail/)
 * [Windcloud](https://windcloud.de/)
 * [Clouding.io](https://clouding.io)
 
@@ -244,6 +245,13 @@ Tested on Cloud VPS. Contabo sets the hostname to something like `vmi######.cont
 |------------|-----------------|-----------|----------|
 |Ubuntu      | 22.04           |**success**|2022-09-26|
 
+### AWS Lightsail
+Make sure to set `PROVIDER="lightsail"`. 
+
+Setting a root ssh key manually is not necessary, the key provided as part of the instance launch process will be used.
+
+If you run into issues, debug using the most similar ec2 instance that is on the Nitro platform. Nitro platform instances have a serial console that allow you to troubleshoot boot issues, and Lightsail instances are just EC2 with a different pricing model and UI.
+
 ### Windcloud
 Tested on vServer. The network configuration seems to be important so the same tweaks as for DigitalOcean are necessary (see above).
 #### Tested on
@@ -259,6 +267,7 @@ Requires the same static network settings that Digital Ocean does.
 #### Tested on
 |Distribution|       Name      | Status    | test date|
 |------------|-----------------|-----------|----------|
+|Debian      | 11.4            |**success**|2022-12-12|
 |Ubuntu      | 20.04           | success   |2022-11-26|
 
 ### Clouding.io

nixos-infect

@@ -7,6 +7,13 @@ set -e -o pipefail
 makeConf() {
   # Skip everything if main config already present
   [[ -e /etc/nixos/configuration.nix ]] && return 0
+
+  # Lightsail config is not like the others
+  if [ "$PROVIDER" = "lightsail" ]; then
+    makeLightsailConf
+    return 0
+  fi
+
   # NB <<"EOF" quotes / $ ` in heredocs, <<EOF does not
   mkdir -p /etc/nixos
   # Prevent grep for sending error code 1 (and halting execution) when no lines are selected : https://www.unix.com/man-page/posix/1P/grep
@@ -76,6 +83,16 @@ EOF
   [[ -n "$doNetConf" ]] && makeNetworkingConf || true
 }
 
+makeLightsailConf() {
+  mkdir -p /etc/nixos
+  cat > /etc/nixos/configuration.nix << EOF
+{ config, pkgs, modulesPath, ... }:
+{
+  imports = [ "\${modulesPath}/virtualisation/amazon-image.nix" ];
+}
+EOF
+}
+
 makeNetworkingConf() {
   # XXX It'd be better if we used procfs for all this...
   local IFS=$'\n'
@@ -318,6 +335,12 @@ infect() {
   # Reify resolv.conf
   [[ -L /etc/resolv.conf ]] && mv -v /etc/resolv.conf /etc/resolv.conf.lnk && cat /etc/resolv.conf.lnk > /etc/resolv.conf
 
+  # Set label of root partition
+  if [ -n "$newrootfslabel" ]; then
+    echo "Setting label of $rootfsdev to $newrootfslabel"
+    e2label "$rootfsdev" "$newrootfslabel"
+  fi
+
   # Stage the Nix coup d'état
   touch /etc/NIXOS
   echo etc/nixos                  >> /etc/NIXOS_LUSTRATE
@@ -337,6 +360,8 @@ infect() {
   /nix/var/nix/profiles/system/bin/switch-to-configuration boot
 }
 
+[ "$PROVIDER" = "digitalocean" ] && doNetConf=y # digitalocean requires detailed network config to be generated
+[ "$PROVIDER" = "lightsail" ] && newrootfslabel="nixos"
 if [[ "$PROVIDER" = "digitalocean" ]] || [[ "$PROVIDER" = "servarica" ]]; then
 	doNetConf=y # some providers require detailed network config to be generated
 fi