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|
{ depot, pkgs, lib, ... }:
let
inherit (builtins) concatLists concatStringsSep toJSON unsafeDiscardStringContext;
inherit (depot.users) wpcarro;
inherit (pkgs) writeText;
images = import "${pkgs.path}/nixos/modules/virtualisation/gce-images.nix";
nixosImage = images."20.09";
in {
googleCloudVM = {
project,
name,
region,
zone,
configuration,
extraConfig ? {},
}: let
inherit (configuration.users.users) root;
inherit (configuration.networking) firewall;
# Convert NixOS-style port numbers to Terraform-style.
asStrings = xs: map toString xs;
asRanges = xs: map (x: "${toString x.from}-${toString x.to}") xs;
sshKeys = concatStringsSep "\n"
(map (key: "root:${key}") root.openssh.authorizedKeys.keys);
os = depot.ops.nixos.nixosFor (_: {
imports = [
"${pkgs.path}/nixos/modules/virtualisation/google-compute-image.nix"
configuration
];
networking.hostName = name;
fileSystems."/nix" = {
device = "/dev/disk/by-label/google-${name}-disk";
fsType = "ext4";
};
});
osRoot = os.config.system.build.toplevel;
osPath = unsafeDiscardStringContext (toString osRoot.outPath);
drvPath = unsafeDiscardStringContext (toString osRoot.drvPath);
in writeText "terraform.tf.json" (toJSON (lib.recursiveUpdate extraConfig {
provider.google = {
inherit project region zone;
};
resource.google_compute_instance."${name}" = {
inherit name zone;
machine_type = "e2-standard-2";
tags = [
"http-server"
"https-server"
"${name}-firewall"
];
boot_disk = {
device_name = "boot";
initialize_params = {
size = 10;
image = "projects/nixos-cloud/global/images/${nixosImage.name}";
};
};
attached_disk = {
source = "\${google_compute_disk.${name}.id}";
device_name = "${name}-disk";
};
network_interface = {
network = "default";
subnetwork = "default";
access_config = {};
};
# Copy root's SSH keys from the NixOS configuration and expose them to the
# metadata server.
metadata = {
inherit sshKeys;
ssh-keys = sshKeys;
# NixOS's fetch-instance-ssh-keys.bash relies on these fields being
# available on the metadata server.
ssh_host_ed25519_key = "\${tls_private_key.${name}.private_key_pem}";
ssh_host_ed25519_key_pub = "\${tls_private_key.${name}.public_key_pem}";
# Even though we have SSH access, having oslogin can still be useful for
# troubleshooting in the browser if for some reason SSH isn't working as
# expected.
enable-oslogin = "TRUE";
};
service_account.scopes = ["cloud-platform"];
};
resource.tls_private_key."${name}" = {
algorithm = "ECDSA";
ecdsa_curve = "P384";
};
resource.google_compute_firewall."${name}" = {
name = "${name}-firewall";
network = "default";
# Read the firewall configuration from the NixOS configuration.
allow = [
{
protocol = "tcp";
ports = concatLists [
(asStrings (firewall.allowedTCPPorts or []))
(asRanges (firewall.allowedTCPPortRanges or []))
];
}
{
protocol = "udp";
ports = concatLists [
(asStrings (firewall.allowedUDPPorts or []))
(asRanges (firewall.allowedUDPPortRanges or []))
];
}
];
source_tags = ["${name}-firewall"];
};
resource.google_compute_disk."${name}" = {
inherit zone;
name = "${name}-disk";
size = 100;
};
resource.null_resource.deploy_nixos = {
triggers = {
# Redeploy when the NixOS configuration changes.
os = "${osPath}";
# Redeploy when a new machine is provisioned.
machine_id = "\${google_compute_instance.${name}.id}";
};
connection = {
host = "\${google_compute_instance.${name}.network_interface[0].access_config[0].nat_ip}";
};
provisioner = [
{ remote-exec.inline = ["true"]; }
{
local-exec.command = ''
export PATH="${pkgs.openssh}/bin:$PATH"
scratch="$(mktemp -d)"
function cleanup() {
rm -rf $scratch
}
trap cleanup EXIT
# write out ssh key
echo -n "''${tls_private_key.${name}.private_key_pem}" > $scratch/id_rsa.pem
chmod 0600 $scratch/id_rsa.pem
export NIX_SSHOPTS="\
-o StrictHostKeyChecking=no\
-o UserKnownHostsFile=/dev/null\
-o GlobalKnownHostsFile=/dev/null\
-o IdentityFile=$scratch/id_rsa.pem
"
nix-build ${drvPath}
nix-copy-closure --to \
root@''${google_compute_instance.${name}.network_interface[0].access_config[0].nat_ip} \
${osPath} --gzip --use-substitutes
'';
}
{
remote-exec.inline = [
"nix-env --profile /nix/var/nix/profiles/system --set ${osPath}"
"${osPath}/bin/switch-to-configuration switch"
];
}
];
};
}));
}
|
