Merge pull request #26214 from zimbatm/google-compute-image

Google compute image

nixos/modules/virtualisation/google-compute-image.nix

···
 with lib;
 let
   diskSize = 1024; # MB
+  gce = pkgs.google-compute-engine;
 in
 {
   imports = [ ../profiles/headless.nix ../profiles/qemu-guest.nix ./grow-partition.nix ];
-
-  # https://cloud.google.com/compute/docs/tutorials/building-images
-  networking.firewall.enable = mkDefault false;
 
   system.build.googleComputeImage = import ../../lib/make-disk-image.nix {
     name = "google-compute-image";
···
   services.openssh.permitRootLogin = "prohibit-password";
   services.openssh.passwordAuthentication = mkDefault false;
 
+  # Use GCE udev rules for dynamic disk volumes
+  services.udev.packages = [ gce ];
+
   # Force getting the hostname from Google Compute.
   networking.hostName = mkDefault "";
 
   # Always include cryptsetup so that NixOps can use it.
   environment.systemPackages = [ pkgs.cryptsetup ];
 
+  # Rely on GCP's firewall instead
+  networking.firewall.enable = mkDefault false;
+
   # Configure default metadata hostnames
   networking.extraHosts = ''
     169.254.169.254 metadata.google.internal metadata
···
 
   networking.usePredictableInterfaceNames = false;
 
+  # allow the google-accounts-daemon to manage users
+  users.mutableUsers = true;
+  # and allow users to sudo without password
+  security.sudo.enable = true;
+  security.sudo.extraConfig = ''
+  %google-sudoers ALL=(ALL:ALL) NOPASSWD:ALL
+  '';
+
+  # NOTE: google-accounts tries to write to /etc/sudoers.d but the folder doesn't exist
+  # FIXME: not such file or directory on dynamic SSH provisioning
+  systemd.services.google-accounts-daemon = {
+    description = "Google Compute Engine Accounts Daemon";
+    # This daemon creates dynamic users
+    enable = config.users.mutableUsers;
+    after = [
+      "network.target"
+      "google-instance-setup.service"
+      "google-network-setup.service"
+    ];
+    wantedBy = [ "multi-user.target" ];
+    requires = ["network.target"];
+    path = with pkgs; [ shadow ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${gce}/bin/google_accounts_daemon --debug";
+    };
+  };
+
+  systemd.services.google-clock-skew-daemon = {
+    description = "Google Compute Engine Clock Skew Daemon";
+    after = [
+      "network.target"
+      "google-instance-setup.service"
+      "google-network-setup.service"
+    ];
+    requires = [ "network.target" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${gce}/bin/google_clock_skew_daemon --debug";
+    };
+  };
+
+  systemd.services.google-instance-setup = {
+    description = "Google Compute Engine Instance Setup";
+    after = ["fs.target" "network-online.target" "network.target" "rsyslog.service"];
+    before = ["sshd.service"];
+    wants = ["local-fs.target" "network-online.target" "network.target"];
+    wantedBy = [ "sshd.service" "multi-user.target" ];
+    path = with pkgs; [ ethtool ];
+    serviceConfig = {
+      ExecStart = "${gce}/bin/google_instance_setup --debug";
+      Type = "oneshot";
+    };
+  };
+
+  systemd.services.google-ip-forwarding-daemon = {
+    description = "Google Compute Engine IP Forwarding Daemon";
+    after = ["network.target" "google-instance-setup.service" "google-network-setup.service"];
+    requires = ["network.target"];
+    wantedBy = [ "multi-user.target" ];
+    path = with pkgs; [ iproute ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${gce}/bin/google_ip_forwarding_daemon --debug";
+    };
+  };
+
+  systemd.services.google-shutdown-scripts = {
+    description = "Google Compute Engine Shutdown Scripts";
+    after = [
+      "local-fs.target"
+      "network-online.target"
+      "network.target"
+      "rsyslog.service"
+      "google-instance-setup.service"
+      "google-network-setup.service"
+    ];
+    wants = [ "local-fs.target" "network-online.target" "network.target"];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      ExecStart = "${pkgs.coreutils}/bin/true";
+      ExecStop = "${gce}/bin/google_metadata_script_runner --debug --script-type shutdown";
+      Type = "oneshot";
+      RemainAfterExit = true;
+      TimeoutStopSec = 0;
+    };
+  };
+
+  systemd.services.google-network-setup = {
+    description = "Google Compute Engine Network Setup";
+    after = [
+      "local-fs.target"
+      "network-online.target"
+      "network.target"
+      "rsyslog.service"
+    ];
+    wants = [ "local-fs.target" "network-online.target" "network.target"];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      ExecStart = "${gce}/bin/google_network_setup --debug";
+      KillMode = "process";
+      Type = "oneshot";
+    };
+  };
+
+  systemd.services.google-startup-scripts = {
+    description = "Google Compute Engine Startup Scripts";
+    after = [
+      "local-fs.target"
+      "network-online.target"
+      "network.target"
+      "rsyslog.service"
+      "google-instance-setup.service"
+      "google-network-setup.service"
+    ];
+    wants = [ "local-fs.target" "network-online.target" "network.target"];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      ExecStart = "${gce}/bin/google_metadata_script_runner --debug --script-type startup";
+      KillMode = "process";
+      Type = "oneshot";
+    };
+  };
+
+  # TODO: remove this
   systemd.services.fetch-ssh-keys =
     { description = "Fetch host keys and authorized_keys for root user";
 
···
       serviceConfig.StandardOutput = "journal+console";
     };
 
-  # Setings taken from https://cloud.google.com/compute/docs/tutorials/building-images#providedkernel
+  # Settings taken from https://github.com/GoogleCloudPlatform/compute-image-packages/blob/master/google_config/sysctl/11-gce-network-security.conf
   boot.kernel.sysctl = {
-    # enables syn flood protection
+    # Turn on SYN-flood protections.  Starting with 2.6.26, there is no loss
+    # of TCP functionality/features under normal conditions.  When flood
+    # protections kick in under high unanswered-SYN load, the system
+    # should remain more stable, with a trade off of some loss of TCP
+    # functionality/features (e.g. TCP Window scaling).
     "net.ipv4.tcp_syncookies" = mkDefault "1";
 
     # ignores source-routed packets
···
 
     # randomizes addresses of mmap base, heap, stack and VDSO page
     "kernel.randomize_va_space" = mkDefault "2";
+
+    # Reboot the machine soon after a kernel panic.
+    "kernel.panic" = mkDefault "10";
+
+    ## Not part of the original config
 
     # provides protection from ToCToU races
     "fs.protected_hardlinks" = mkDefault "1";

pkgs/tools/virtualization/google-compute-engine/0001-allow-nologin-other-paths.patch

···
+From 2e9ac201af238b742c7032962b9b12a8b66bab0c Mon Sep 17 00:00:00 2001
+From: zimbatm <[e-mail]>
+Date: Mon, 29 May 2017 22:36:15 +0100
+Subject: [PATCH] allow nologin on other paths
+
+---
+ google_compute_engine/accounts/accounts_utils.py | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/google_compute_engine/accounts/accounts_utils.py b/google_compute_engine/accounts/accounts_utils.py
+index 57e62be..d7eda06 100644
+--- a/google_compute_engine/accounts/accounts_utils.py
++++ b/google_compute_engine/accounts/accounts_utils.py
+@@ -295,8 +295,8 @@ class AccountsUtils(object):
+     # logins. This helps avoid problems caused by operator and root sharing
+     # a home directory in CentOS and RHEL.
+     pw_entry = self._GetUser(user)
+-    if pw_entry and pw_entry.pw_shell == '/sbin/nologin':
+-      message = 'Not updating user %s. User set /sbin/nologin as login shell.'
++    if pw_entry and os.path.basename(pw_entry.pw_shell) == 'nologin':
++      message = 'Not updating user %s. User set `nologin` as login shell.'
+       self.logger.debug(message, user)
+       return True
+ 
+-- 
+2.13.0
+

pkgs/tools/virtualization/google-compute-engine/default.nix

···
+{ lib
+, fetchFromGitHub
+, pythonPackages
+, bash
+, shadow
+, systemd
+, utillinux
+}:
+let
+  version = "20170523";
+in
+pythonPackages.buildPythonApplication {
+  name = "google-compute-engine-${version}";
+  namePrefix = "";
+
+  src = fetchFromGitHub {
+    owner = "GoogleCloudPlatform";
+    repo = "compute-image-packages";
+    rev = version;
+    sha256 = "1qxyj3lj9in6m8yi6y6wcmc3662h9z4qax07v97rdnay99mxdv68";
+  };
+
+  patches = [ ./0001-allow-nologin-other-paths.patch ];
+
+  postPatch = ''
+    for file in $(find google_compute_engine -type f); do
+      substituteInPlace "$file" \
+        --replace /bin/systemctl "${systemd}/bin/systemctl" \
+        --replace /bin/bash "${bash}/bin/bash" \
+        --replace /sbin/hwclock "${utillinux}/bin/hwclock"
+
+      # SELinux tool ???  /sbin/restorecon
+    done
+
+    substituteInPlace google_config/udev/64-gce-disk-removal.rules \
+      --replace /bin/sh "${bash}/bin/sh" \
+      --replace /bin/umount "${utillinux}/bin/umount" \
+      --replace /usr/bin/logger "${utillinux}/bin/logger"
+  '';
+
+  postInstall = ''
+    # allows to install the package in `services.udev.packages` in NixOS
+    mkdir -p $out/lib/udev/rules.d
+    cp -r google_config/udev/*.rules $out/lib/udev/rules.d
+  '';
+
+  propagatedBuildInputs = with pythonPackages; [ boto setuptools ];
+
+  meta = with lib; {
+    description = "Google Compute Engine tools and services";
+    homepage = https://github.com/GoogleCloudPlatform/compute-image-packages;
+    license = licenses.asl20;
+    maintainers = with maintainers; [ zimbatm ];
+  };
+}

pkgs/top-level/all-packages.nix

···
 
   google-fonts = callPackage ../data/fonts/google-fonts { };
 
+  google-compute-engine = callPackage ../tools/virtualization/google-compute-engine {  };
+
   gource = callPackage ../applications/version-management/gource { };
 
   gpart = callPackage ../tools/filesystems/gpart { };