mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-01 07:01:54 +00:00
62 lines
1.8 KiB
Nix
62 lines
1.8 KiB
Nix
{ config, pkgs, ... }:
|
|
|
|
let
|
|
script = ''
|
|
#!${pkgs.runtimeShell} -eu
|
|
|
|
echo "attempting to fetch configuration from EC2 user data..."
|
|
|
|
export HOME=/root
|
|
export PATH=${pkgs.lib.makeBinPath [ config.nix.package pkgs.systemd pkgs.gnugrep pkgs.gnused config.system.build.nixos-rebuild]}:$PATH
|
|
export NIX_PATH=/nix/var/nix/profiles/per-user/root/channels/nixos:nixos-config=/etc/nixos/configuration.nix:/nix/var/nix/profiles/per-user/root/channels
|
|
|
|
userData=/etc/ec2-metadata/user-data
|
|
|
|
if [ -s "$userData" ]; then
|
|
# If the user-data looks like it could be a nix expression,
|
|
# copy it over. Also, look for a magic three-hash comment and set
|
|
# that as the channel.
|
|
if sed '/^\(#\|SSH_HOST_.*\)/d' < "$userData" | grep -q '\S'; then
|
|
channels="$(grep '^###' "$userData" | sed 's|###\s*||')"
|
|
printf "%s" "$channels" | while read channel; do
|
|
echo "writing channel: $channel"
|
|
done
|
|
|
|
if [[ -n "$channels" ]]; then
|
|
printf "%s" "$channels" > /root/.nix-channels
|
|
nix-channel --update
|
|
fi
|
|
|
|
echo "setting configuration from EC2 user data"
|
|
cp "$userData" /etc/nixos/configuration.nix
|
|
else
|
|
echo "user data does not appear to be a Nix expression; ignoring"
|
|
exit
|
|
fi
|
|
else
|
|
echo "no user data is available"
|
|
exit
|
|
fi
|
|
|
|
nixos-rebuild switch
|
|
'';
|
|
in {
|
|
systemd.services.amazon-init = {
|
|
inherit script;
|
|
description = "Reconfigure the system from EC2 userdata on startup";
|
|
|
|
wantedBy = [ "multi-user.target" ];
|
|
after = [ "multi-user.target" ];
|
|
requires = [ "network-online.target" ];
|
|
|
|
restartIfChanged = false;
|
|
unitConfig.X-StopOnRemoval = false;
|
|
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
RemainAfterExit = true;
|
|
};
|
|
};
|
|
}
|
|
|