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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.buildkite-agent;
mkHookOption = { name, description, example ? null }: {
inherit name;
value = mkOption {
default = null;
inherit description;
type = types.nullOr types.lines;
} // (if example == null then {} else { inherit example; });
};
mkHookOptions = hooks: listToAttrs (map mkHookOption hooks);
hooksDir = let
mkHookEntry = name: value: ''
cat > $out/${name} <<'EOF'
#! ${pkgs.runtimeShell}
set -e
${value}
EOF
chmod 755 $out/${name}
'';
in pkgs.runCommand "buildkite-agent-hooks" { preferLocalBuild = true; } ''
mkdir $out
${concatStringsSep "\n" (mapAttrsToList mkHookEntry (filterAttrs (n: v: v != null) cfg.hooks))}
'';
in
{
options = {
services.buildkite-agent = {
enable = mkEnableOption "buildkite-agent";
package = mkOption {
default = pkgs.buildkite-agent;
defaultText = "pkgs.buildkite-agent";
description = "Which buildkite-agent derivation to use";
type = types.package;
};
dataDir = mkOption {
default = "/var/lib/buildkite-agent";
description = "The workdir for the agent";
type = types.str;
};
runtimePackages = mkOption {
default = [ pkgs.bash pkgs.nix ];
defaultText = "[ pkgs.bash pkgs.nix ]";
description = "Add programs to the buildkite-agent environment";
type = types.listOf types.package;
};
tokenPath = mkOption {
type = types.path;
description = ''
The token from your Buildkite "Agents" page.
A run-time path to the token file, which is supposed to be provisioned
outside of Nix store.
'';
};
name = mkOption {
type = types.str;
default = "%hostname-%n";
description = ''
The name of the agent.
'';
};
meta-data = mkOption {
type = types.str;
default = "";
example = "queue=default,docker=true,ruby2=true";
description = ''
Meta data for the agent. This is a comma-separated list of
<code>key=value</code> pairs.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
example = "debug=true";
description = ''
Extra lines to be added verbatim to the configuration file.
'';
};
openssh =
{ privateKeyPath = mkOption {
type = types.path;
description = ''
Private agent key.
A run-time path to the key file, which is supposed to be provisioned
outside of Nix store.
'';
};
publicKeyPath = mkOption {
type = types.path;
description = ''
Public agent key.
A run-time path to the key file, which is supposed to be provisioned
outside of Nix store.
'';
};
};
hooks = mkHookOptions [
{ name = "checkout";
description = ''
The `checkout` hook script will replace the default checkout routine of the
bootstrap.sh script. You can use this hook to do your own SCM checkout
behaviour
''; }
{ name = "command";
description = ''
The `command` hook script will replace the default implementation of running
the build command.
''; }
{ name = "environment";
description = ''
The `environment` hook will run before all other commands, and can be used
to set up secrets, data, etc. Anything exported in hooks will be available
to the build script.
Note: the contents of this file will be copied to the world-readable
Nix store.
'';
example = ''
export SECRET_VAR=`head -1 /run/keys/secret`
''; }
{ name = "post-artifact";
description = ''
The `post-artifact` hook will run just after artifacts are uploaded
''; }
{ name = "post-checkout";
description = ''
The `post-checkout` hook will run after the bootstrap script has checked out
your projects source code.
''; }
{ name = "post-command";
description = ''
The `post-command` hook will run after the bootstrap script has run your
build commands
''; }
{ name = "pre-artifact";
description = ''
The `pre-artifact` hook will run just before artifacts are uploaded
''; }
{ name = "pre-checkout";
description = ''
The `pre-checkout` hook will run just before your projects source code is
checked out from your SCM provider
''; }
{ name = "pre-command";
description = ''
The `pre-command` hook will run just before your build command runs
''; }
{ name = "pre-exit";
description = ''
The `pre-exit` hook will run just before your build job finishes
''; }
];
hooksPath = mkOption {
type = types.path;
default = hooksDir;
defaultText = "generated from services.buildkite-agent.hooks";
description = ''
Path to the directory storing the hooks.
Consider using <option>services.buildkite-agent.hooks.<name></option>
instead.
'';
};
};
};
config = mkIf config.services.buildkite-agent.enable {
users.users.buildkite-agent =
{ name = "buildkite-agent";
home = cfg.dataDir;
createHome = true;
description = "Buildkite agent user";
extraGroups = [ "keys" ];
isSystemUser = true;
};
environment.systemPackages = [ cfg.package ];
systemd.services.buildkite-agent =
{ description = "Buildkite Agent";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
path = cfg.runtimePackages ++ [ pkgs.coreutils ];
environment = config.networking.proxy.envVars // {
HOME = cfg.dataDir;
NIX_REMOTE = "daemon";
};
## NB: maximum care is taken so that secrets (ssh keys and the CI token)
## don't end up in the Nix store.
preStart = let
sshDir = "${cfg.dataDir}/.ssh";
in
''
mkdir -m 0700 -p "${sshDir}"
cp -f "${toString cfg.openssh.privateKeyPath}" "${sshDir}/id_rsa"
cp -f "${toString cfg.openssh.publicKeyPath}" "${sshDir}/id_rsa.pub"
chmod 600 "${sshDir}"/id_rsa*
cat > "${cfg.dataDir}/buildkite-agent.cfg" <<EOF
token="$(cat ${toString cfg.tokenPath})"
name="${cfg.name}"
meta-data="${cfg.meta-data}"
build-path="${cfg.dataDir}/builds"
hooks-path="${cfg.hooksPath}"
${cfg.extraConfig}
EOF
'';
serviceConfig =
{ ExecStart = "${pkgs.buildkite-agent}/bin/buildkite-agent start --config /var/lib/buildkite-agent/buildkite-agent.cfg";
User = "buildkite-agent";
RestartSec = 5;
Restart = "on-failure";
TimeoutSec = 10;
};
};
assertions = [
{ assertion = cfg.hooksPath == hooksDir || all (v: v == null) (attrValues cfg.hooks);
message = ''
Options `services.buildkite-agent.hooksPath' and
`services.buildkite-agent.hooks.<name>' are mutually exclusive.
'';
}
];
};
imports = [
(mkRenamedOptionModule [ "services" "buildkite-agent" "token" ] [ "services" "buildkite-agent" "tokenPath" ])
(mkRenamedOptionModule [ "services" "buildkite-agent" "openssh" "privateKey" ] [ "services" "buildkite-agent" "openssh" "privateKeyPath" ])
(mkRenamedOptionModule [ "services" "buildkite-agent" "openssh" "publicKey" ] [ "services" "buildkite-agent" "openssh" "publicKeyPath" ])
];
}
|