diff options
Diffstat (limited to 'users/grfn/terraform/nixosMachine.nix')
| -rw-r--r-- | users/grfn/terraform/nixosMachine.nix | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/users/grfn/terraform/nixosMachine.nix b/users/grfn/terraform/nixosMachine.nix new file mode 100644 index 000000000000..23cd83880420 --- /dev/null +++ b/users/grfn/terraform/nixosMachine.nix @@ -0,0 +1,208 @@ +{ depot, pkgs, lib, ... }: + +# mostly stolen from espes + +{ name +, instanceType +, configuration +, prefix ? "${name}_" +, region ? "us-east-2" +, rootVolumeSizeGb ? 50 +, securityGroupId ? null +, extraIngressPorts ? [ ] +}: + +let + os = depot.ops.nixos.nixosFor ({ modulesPath, ... }: { + imports = [ + (pkgs.path + "/nixos/modules/virtualisation/amazon-image.nix") + configuration + ]; + + ec2.hvm = true; + networking.hostName = name; + # TODO: remove this once the terraform tls provider supports ed25519 keys + # https://github.com/hashicorp/terraform-provider-tls/issues/26 + services.openssh.extraConfig = '' + PubkeyAcceptedKeyTypes=+ssh-rsa + PubkeyAcceptedAlgorithms=+ssh-rsa + ''; + }); + + targetUser = "root"; + + ec2Amis = import "${pkgs.path}/nixos/modules/virtualisation/ec2-amis.nix"; + + osRoot = os.config.system.build.toplevel; + + osRootPath = builtins.unsafeDiscardStringContext (toString osRoot.outPath); + drvPath = builtins.unsafeDiscardStringContext (toString osRoot.drvPath); + + machineResource = "aws_instance.${prefix}machine"; + + recursiveMerge = builtins.foldl' lib.recursiveUpdate { }; + + securityGroupId' = + if isNull securityGroupId + then "\${aws_security_group.${prefix}group.id}" + else securityGroupId; +in +recursiveMerge [ + (lib.optionalAttrs (isNull securityGroupId) { + resource.aws_security_group."${prefix}group" = { + provider = "aws.${region}"; + vpc_id = null; + + # terraform isn't good about knowing what other resources depend on + # security groups + lifecycle.create_before_destroy = true; + }; + + resource.aws_security_group_rule.all_egress = { + provider = "aws.${region}"; + security_group_id = securityGroupId'; + type = "egress"; + protocol = "-1"; + from_port = 0; + to_port = 0; + cidr_blocks = [ "0.0.0.0/0" ]; + ipv6_cidr_blocks = [ "::/0" ]; + + description = null; + prefix_list_ids = null; + self = null; + }; + }) + rec { + data.external.my_ip = { + program = [ + (pkgs.writeShellScript "my_ip" '' + ${pkgs.jq}/bin/jq \ + -n \ + --arg ip "$(curl ifconfig.me)" \ + '{"ip":$ip}' + '') + ]; + }; + + resource.aws_security_group_rule.provision_ssh_access = { + provider = "aws.${region}"; + security_group_id = securityGroupId'; + type = "ingress"; + protocol = "TCP"; + from_port = 22; + to_port = 22; + cidr_blocks = [ "\${data.external.my_ip.result.ip}/32" ]; + ipv6_cidr_blocks = [ ]; + description = null; + prefix_list_ids = null; + self = null; + }; + + resource.tls_private_key."${prefix}key" = { + algorithm = "RSA"; + }; + + resource.aws_key_pair."${prefix}generated_key" = { + provider = "aws.${region}"; + key_name = "generated-key-\${sha256(tls_private_key.${prefix}key.public_key_openssh)}"; + public_key = "\${tls_private_key.${prefix}key.public_key_openssh}"; + }; + + resource.aws_instance."${prefix}machine" = { + provider = "aws.${region}"; + ami = ec2Amis."21.05"."${region}".hvm-ebs; + instance_type = instanceType; + vpc_security_group_ids = [ securityGroupId' ]; + key_name = "\${aws_key_pair.${prefix}generated_key.key_name}"; + root_block_device = { + volume_size = rootVolumeSizeGb; + tags.Name = name; + }; + tags.Name = name; + }; + + resource.null_resource."${prefix}deploy_nixos" = { + triggers = { + # deploy if the machine is recreated + machine_id = "\${${machineResource}.id}"; + + # deploy on os changes + os_drv = drvPath; + }; + + connection = { + type = "ssh"; + host = "\${${machineResource}.public_ip}"; + user = targetUser; + private_key = "\${tls_private_key.${prefix}key.private_key_pem}"; + }; + + # do the actual deployment + provisioner = [ + # wait till ssh is up + { remote-exec.inline = [ "true" ]; } + + # copy the nixos closure + { + local-exec.command = '' + export PATH="${pkgs.openssh}/bin:$PATH" + + scratch="$(mktemp -d)" + trap 'rm -rf -- "$scratch"' EXIT + + # write out ssh key + echo -n "''${tls_private_key.${prefix}key.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 ${targetUser}@''${${machineResource}.public_ip} \ + ${osRootPath} \ + --gzip \ + --use-substitutes + ''; + } + + # activate it + { + remote-exec.inline = [ + # semicolons mandatory + '' + set -e; + nix-env --profile /nix/var/nix/profiles/system --set ${osRootPath}; + ${osRootPath}/bin/switch-to-configuration switch; + '' + ]; + } + ]; + }; + } + + { + resource.aws_security_group_rule = builtins.listToAttrs (map + (port: { + name = "ingress_${toString port}"; + value = { + provider = "aws.${region}"; + security_group_id = securityGroupId'; + type = "ingress"; + protocol = "TCP"; + from_port = port; + to_port = port; + cidr_blocks = [ "0.0.0.0/0" ]; + ipv6_cidr_blocks = [ ]; + description = null; + prefix_list_ids = null; + self = null; + }; + }) + extraIngressPorts); + } +] |