forked from mirrors/nixpkgs
53 lines
1.8 KiB
Nix
53 lines
1.8 KiB
Nix
{ config, pkgs, modulesPath, ... }:
|
|
|
|
# This attempts to pull a nix expression from this EC2 instance's user-data.
|
|
|
|
let
|
|
bootScript = pkgs.writeScript "bootscript.sh" ''
|
|
#!${pkgs.stdenv.shell} -eux
|
|
|
|
echo "attempting to fetch configuration from user-data..."
|
|
|
|
export PATH=${config.nix.package}/bin:${pkgs.wget}/bin:${pkgs.systemd}/bin:${pkgs.gnugrep}/bin:${pkgs.gnused}/bin:${config.system.build.nixos-rebuild}/bin:$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="$(mktemp)"
|
|
wget -q --wait=1 --tries=0 --retry-connrefused -O - http://169.254.169.254/2011-01-01/user-data > "$userData"
|
|
|
|
if [[ $? -eq 0 ]]; then
|
|
echo "user-data fetched"
|
|
# 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" "$channels" > /root/.nix-channels
|
|
nix-channel --update
|
|
fi
|
|
|
|
echo "setting configuration"
|
|
cp "$userData" /etc/nixos/configuration.nix
|
|
else
|
|
echo "user-data does not appear to be a nix expression; ignoring"
|
|
fi
|
|
else
|
|
echo "failed to fetch user-data"
|
|
fi
|
|
|
|
type -f nixos-rebuild
|
|
|
|
nixos-rebuild switch
|
|
'';
|
|
in {
|
|
imports = [ "${modulesPath}/virtualisation/amazon-image.nix" ];
|
|
ec2.metadata = true;
|
|
boot.postBootCommands = ''
|
|
${bootScript} &
|
|
'';
|
|
}
|