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* Docker utilities for gitlab-mcp container management
*/
import { spawnSync, spawn, ChildProcess } from 'child_process';
import { randomBytes } from 'crypto';
import { chmodSync, existsSync, readFileSync, writeFileSync, mkdirSync } from 'fs';
import { join } from 'path';
import YAML from 'yaml';
import {
DockerConfig,
DockerComposeFile,
DockerStatusResult,
DockerCommandResult,
ContainerInfo,
ContainerStatus,
GitLabInstance,
InstancesYaml,
DEFAULT_DOCKER_CONFIG,
getConfigDir,
} from './types';
import { getContainerRuntime } from './container-runtime';
import { expandPath } from '../utils/path-utils.js';
// Re-export expandPath for backwards compatibility with existing imports
export { expandPath } from '../utils/path-utils.js';
/**
* Get expanded config directory path
*/
export function getExpandedConfigDir(): string {
return expandPath(getConfigDir());
}
/**
* Check if a container runtime (Docker/Podman) is installed
*/
export function isDockerInstalled(): boolean {
const runtime = getContainerRuntime();
return runtime.runtimeVersion !== undefined;
}
/**
* Check if the container runtime daemon is running
*/
export function isDockerRunning(): boolean {
const runtime = getContainerRuntime();
return runtime.runtimeAvailable;
}
/**
* Check if a compose tool is available for the detected runtime
*/
export function isComposeInstalled(): boolean {
const runtime = getContainerRuntime();
return runtime.composeCmd !== null;
}
/**
* Validate container name format to prevent command injection
*/
function isValidContainerName(name: string): boolean {
// Docker container names can only contain [a-zA-Z0-9][a-zA-Z0-9_.-]
return /^[a-zA-Z0-9][a-zA-Z0-9_.-]*$/.test(name);
}
/**
* Get container info
*/
export function getContainerInfo(containerName: string = 'gitlab-mcp'): ContainerInfo | undefined {
// Validate container name to prevent command injection
if (!isValidContainerName(containerName)) {
console.error(
`Invalid container name: "${containerName}". Name must match [a-zA-Z0-9][a-zA-Z0-9_.-]*`,
);
return undefined;
}
try {
const runtime = getContainerRuntime();
const result = spawnSync(
runtime.runtimeCmd,
[
'ps',
'-a',
'--filter',
`name=${containerName}`,
'--format',
'{{.ID}}|{{.Names}}|{{.Image}}|{{.Status}}|{{.Ports}}|{{.CreatedAt}}',
],
{
stdio: 'pipe',
encoding: 'utf8',
},
);
if (result.status !== 0 || !result.stdout.trim()) {
return undefined;
}
const line = result.stdout.trim().split('\n')[0];
const parts = line.split('|');
if (parts.length < 6) {
return undefined;
}
const [id, name, image, statusStr, ports, created] = parts;
// Parse status
let status: ContainerStatus = 'exited';
const statusLower = statusStr.toLowerCase();
if (statusLower.includes('up')) {
status = 'running';
} else if (statusLower.includes('paused')) {
status = 'paused';
} else if (statusLower.includes('restarting')) {
status = 'restarting';
} else if (statusLower.includes('created')) {
status = 'created';
} else Eif (statusLower.includes('dead')) {
status = 'dead';
}
// Extract uptime from status string
let uptime: string | undefined;
const uptimeMatch = statusStr.match(/Up\s+(.+?)(?:\s*\(|$)/i);
if (uptimeMatch) {
uptime = uptimeMatch[1].trim();
}
return {
id,
name,
image,
status,
ports: ports ? ports.split(',').map((p) => p.trim()) : [],
created,
uptime,
};
} catch {
return undefined;
}
}
/**
* Get Docker status
*/
export function getDockerStatus(containerName: string = 'gitlab-mcp'): DockerStatusResult {
const runtime = getContainerRuntime();
const result: DockerStatusResult = {
dockerInstalled: runtime.runtimeVersion !== undefined,
dockerRunning: runtime.runtimeAvailable,
composeInstalled: runtime.composeCmd !== null,
instances: [],
runtime,
};
if (result.dockerRunning) {
result.container = getContainerInfo(containerName);
}
// Load instances from config
result.instances = loadInstances();
return result;
}
/** Connection string of the database bundled by the compose-bundle deployment */
const BUNDLED_POSTGRESQL_URL =
'postgresql://gitlab_mcp:${POSTGRES_PASSWORD}@postgres:5432/gitlab_mcp';
/**
* PostgreSQL URL the deployment stores OAuth sessions in, as written into the compose
* file; undefined when sessions live in a file on the data volume. An external URL
* carries its password, so it stays in .env and the compose file references it.
*/
function sessionDatabaseUrl(config: DockerConfig): string | undefined {
if (!config.oauthEnabled) return undefined;
if (config.deploymentType === 'compose-bundle') return BUNDLED_POSTGRESQL_URL;
if (config.deploymentType === 'external-db') {
// The compose file references the URL written to .env; without one Compose would
// substitute an empty string and the migrations could not start.
if (!config.databaseUrl) {
throw new Error('An external-db deployment with OAuth needs the PostgreSQL connection URL');
}
return '${OAUTH_STORAGE_POSTGRESQL_URL}';
}
return undefined;
}
const CORE_IMAGE_REPOSITORY = 'ghcr.io/structured-world/gitlab-mcp';
/**
* Image of a deployment that keeps sessions in PostgreSQL. Only the db image carries that
* backend, so the released core image is replaced by the db image of the same tag; any
* other image is taken as a db build already.
*/
function databaseImage(image: string): string {
if (image !== CORE_IMAGE_REPOSITORY && !image.startsWith(`${CORE_IMAGE_REPOSITORY}:`)) {
if (!image.startsWith(`${CORE_IMAGE_REPOSITORY}@`)) return image;
// A digest names one build of the core image; its db image has another digest.
throw new Error('Pin the gitlab-mcp-db image by tag or digest for a PostgreSQL deployment');
}
return image.replace(CORE_IMAGE_REPOSITORY, `${CORE_IMAGE_REPOSITORY}-db`);
}
/**
* A URL as a literal .env value: Compose interpolates unquoted values (a "$" in a password
* would be replaced) but keeps single-quoted ones as written. A single quote inside the
* URL is percent-encoded, which PostgreSQL decodes back to the same connection string.
*/
function envLiteralUrl(url: string): string {
return `'${url.replaceAll("'", '%27')}'`;
}
/**
* Generate docker-compose.yml content
*/
export function generateDockerCompose(config: DockerConfig): string {
const databaseUrl = sessionDatabaseUrl(config);
const image = databaseUrl ? databaseImage(config.image) : config.image;
const environment = [
'TRANSPORT=sse',
'HOST=0.0.0.0',
'PORT=3333',
`OAUTH_ENABLED=${config.oauthEnabled}`,
];
const volumes = ['gitlab-mcp-data:/data'];
const compose: DockerComposeFile = {
version: '3.8',
services: {
'gitlab-mcp': {
image,
container_name: config.containerName,
ports: [`\${PORT:-${config.port}}:3333`],
environment,
volumes,
restart: 'unless-stopped',
},
},
volumes: {
'gitlab-mcp-data': {},
},
};
// Add OAuth-specific configuration
if (config.oauthEnabled) {
// Reference secret via env var — actual value stored in .env file
environment.push(
'OAUTH_SESSION_SECRET=${OAUTH_SESSION_SECRET}',
'OAUTH_ISSUER=${OAUTH_ISSUER}',
);
if (databaseUrl) {
environment.push(
'OAUTH_STORAGE_TYPE=postgresql',
`OAUTH_STORAGE_POSTGRESQL_URL=${databaseUrl}`,
);
} else {
// Sessions survive restarts on the data volume
environment.push(
'OAUTH_STORAGE_TYPE=file',
'OAUTH_STORAGE_FILE_PATH=/data/oauth-sessions.json',
);
}
// The instance list (GITLAB_INSTANCES, rewritten whenever instances change) and the
// instance secrets it names (kept in .env) reach the server at every start.
compose.services['gitlab-mcp'].env_file = ['.env', INSTANCES_ENV_FILE];
}
if (databaseUrl) {
// One-shot schema migration from the db image; the server starts only after it
// succeeds. It waits for the database to accept connections itself and baselines a
// database created before migrations shipped. The bundled database is only started
// first: podman-compose 1.6.0 on Podman 4.9.3 hangs on `service_healthy`
// (https://github.com/containers/podman-compose/issues/1541).
compose.services.migrate = {
image,
restart: 'no',
working_dir: '/app/node_modules/@structured-world/gitlab-mcp-db',
entrypoint: ['node', 'dist/src/migrate.js'],
environment: [`OAUTH_STORAGE_POSTGRESQL_URL=${databaseUrl}`],
...(config.deploymentType === 'compose-bundle' && { depends_on: ['postgres'] }),
};
compose.services['gitlab-mcp'].depends_on = {
migrate: { condition: 'service_completed_successfully' },
};
}
// Add compose-bundle postgres service (only when OAuth needs a database)
if (config.deploymentType === 'compose-bundle' && config.oauthEnabled) {
compose.services.postgres = {
image: 'postgres:16-alpine',
container_name: `${config.containerName}-db`,
ports: [],
environment: [
'POSTGRES_USER=gitlab_mcp',
'POSTGRES_PASSWORD=${POSTGRES_PASSWORD}',
'POSTGRES_DB=gitlab_mcp',
],
volumes: ['postgres-data:/var/lib/postgresql/data'],
restart: 'unless-stopped',
healthcheck: {
test: ['CMD-SHELL', 'pg_isready -U gitlab_mcp'],
interval: '5s',
timeout: '5s',
retries: 5,
},
};
Eif (compose.volumes) {
compose.volumes['postgres-data'] = {};
}
}
// Add tool configuration environment variables
if (config.environment) {
for (const [key, value] of Object.entries(config.environment)) {
environment.push(`${key}=${value}`);
}
}
return YAML.stringify(compose);
}
/**
* Generate instances.yml content
*/
export function generateInstancesYaml(instances: GitLabInstance[]): string {
const yaml: InstancesYaml = {
instances: {},
};
for (const instance of instances) {
yaml.instances[instance.host] = {
name: instance.name,
};
if (instance.oauth) {
yaml.instances[instance.host].oauth = {
client_id: instance.oauth.clientId,
client_secret_env: instance.oauth.clientSecretEnv,
};
}
if (instance.defaultPreset) {
yaml.instances[instance.host].default_preset = instance.defaultPreset;
}
}
return YAML.stringify(yaml);
}
/**
* Load instances from config file
*/
export function loadInstances(): GitLabInstance[] {
const configDir = getExpandedConfigDir();
const instancesPath = join(configDir, 'instances.yml');
if (!existsSync(instancesPath)) {
return [];
}
try {
const content = readFileSync(instancesPath, 'utf8');
const yaml = YAML.parse(content) as InstancesYaml;
return Object.entries(yaml.instances).map(([host, config]) => ({
host,
name: config.name,
oauth: config.oauth
? {
clientId: config.oauth.client_id,
clientSecretEnv: config.oauth.client_secret_env,
}
: undefined,
defaultPreset: config.default_preset,
}));
} catch {
return [];
}
}
/**
* Save instances to config file
*/
export function saveInstances(instances: GitLabInstance[]): void {
const configDir = getExpandedConfigDir();
if (!existsSync(configDir)) {
mkdirSync(configDir, { recursive: true });
}
const instancesPath = join(configDir, 'instances.yml');
const content = generateInstancesYaml(instances);
writeFileSync(instancesPath, content, 'utf8');
saveServerInstances(instances);
}
/** Env file holding the server's instance list, next to the compose file. */
const INSTANCES_ENV_FILE = 'instances.env';
/** JSON escape of a single quote: a backslash followed by u0027. */
const JSON_QUOTE_ESCAPE = `${String.fromCodePoint(92)}u0027`;
/**
* Write the instances as the server reads them: GITLAB_INSTANCES with the configuration
* object the server validates. Secrets stay in .env; each instance names its variable.
*/
function saveServerInstances(instances: GitLabInstance[]): void {
const configDir = getExpandedConfigDir();
if (!existsSync(configDir)) {
mkdirSync(configDir, { recursive: true });
}
let value = '';
if (instances.length > 0) {
const config = {
instances: instances.map((instance) => ({
url: instance.host.includes('://') ? instance.host : `https://${instance.host}`,
label: instance.name,
...(instance.oauth && {
oauth: {
clientId: instance.oauth.clientId,
clientSecretEnv: instance.oauth.clientSecretEnv,
},
}),
})),
};
// Single-quoted env values are literal and cannot contain a single quote; JSON spells
// it as the escape backslash-u0027 instead.
value = `'${JSON.stringify(config).replaceAll("'", JSON_QUOTE_ESCAPE)}'`;
}
writeFileSync(join(configDir, INSTANCES_ENV_FILE), `GITLAB_INSTANCES=${value}\n`, 'utf8');
}
/**
* Save docker-compose.yml to config directory
*/
export function saveDockerCompose(config: DockerConfig): void {
const configDir = getExpandedConfigDir();
if (!existsSync(configDir)) {
mkdirSync(configDir, { recursive: true });
}
const composePath = join(configDir, 'docker-compose.yml');
const content = generateDockerCompose(config);
writeFileSync(composePath, content, 'utf8');
}
/**
* Run docker compose command
*/
export function runComposeCommand(args: string[], configDir?: string): DockerCommandResult {
const cwd = configDir ?? getExpandedConfigDir();
// Check if docker-compose.yml exists
const composePath = join(cwd, 'docker-compose.yml');
if (!existsSync(composePath)) {
return {
success: false,
error: `docker-compose.yml not found in ${cwd}. Run 'gitlab-mcp docker init' first.`,
};
}
const runtime = getContainerRuntime();
if (!runtime.composeCmd) {
return {
success: false,
error: 'No compose tool available. Install docker-compose or podman-compose.',
};
}
try {
// Use the detected compose command
const [composeExe, ...composePrefix] = runtime.composeCmd;
const fullArgs = [...composePrefix, ...args];
const result = spawnSync(composeExe, fullArgs, {
cwd,
stdio: 'pipe',
encoding: 'utf8',
});
if (result.status === 0) {
return {
success: true,
output: result.stdout,
};
} else {
return {
success: false,
error: result.stderr || result.stdout || 'Unknown error',
};
}
} catch (error) {
return {
success: false,
error: error instanceof Error ? error.message : String(error),
};
}
}
/**
* Start container
*/
export function startContainer(): DockerCommandResult {
return runComposeCommand(['up', '-d']);
}
/**
* Stop container
*/
export function stopContainer(): DockerCommandResult {
return runComposeCommand(['down']);
}
/**
* Restart container
*/
export function restartContainer(): DockerCommandResult {
return runComposeCommand(['restart']);
}
/**
* Pull latest image and restart
*/
export function upgradeContainer(): DockerCommandResult {
const pullResult = runComposeCommand(['pull']);
if (!pullResult.success) {
return pullResult;
}
return runComposeCommand(['up', '-d']);
}
/**
* Get container logs (returns process for streaming)
*/
export function tailLogs(follow: boolean = true, lines: number = 100): ChildProcess {
const configDir = getExpandedConfigDir();
const runtime = getContainerRuntime();
if (!runtime.composeCmd) {
throw new Error('No compose tool available. Install Docker Compose or podman-compose.');
}
const [composeExe, ...composePrefix] = runtime.composeCmd;
const args = [...composePrefix, 'logs'];
if (follow) {
args.push('-f');
}
args.push('--tail', String(lines));
return spawn(composeExe, args, {
cwd: configDir,
stdio: 'inherit',
});
}
/**
* Get container logs (non-streaming)
*/
export function getLogs(lines: number = 100): DockerCommandResult {
return runComposeCommand(['logs', '--tail', String(lines)]);
}
/**
* Add a GitLab instance to configuration
*/
export function addInstance(instance: GitLabInstance): void {
const instances = loadInstances();
// Check if already exists
const existingIndex = instances.findIndex((i) => i.host === instance.host);
if (existingIndex >= 0) {
instances[existingIndex] = instance;
} else {
instances.push(instance);
}
saveInstances(instances);
}
/**
* Remove a GitLab instance from configuration
*/
export function removeInstance(host: string): boolean {
const instances = loadInstances();
const filteredInstances = instances.filter((i) => i.host !== host);
if (filteredInstances.length === instances.length) {
return false; // Instance not found
}
saveInstances(filteredInstances);
return true;
}
/**
* Initialize Docker configuration
*/
export function initDockerConfig(config: Partial<DockerConfig> = {}): DockerConfig {
const fullConfig: DockerConfig = {
...DEFAULT_DOCKER_CONFIG,
...config,
};
// Save docker-compose.yml
saveDockerCompose(fullConfig);
// Write .env file with secrets (restricted permissions)
saveEnvFile(fullConfig);
// Save instances if provided; an OAuth deployment's compose file names the server's
// instance list, so it exists from the start
if (fullConfig.instances.length > 0) {
saveInstances(fullConfig.instances);
} else if (fullConfig.oauthEnabled) {
saveServerInstances([]);
}
return fullConfig;
}
/**
* Write .env file with secrets for docker-compose environment variable references.
* File is created with 0600 permissions to limit exposure.
*/
export function saveEnvFile(config: DockerConfig): void {
const configDir = getExpandedConfigDir();
if (!existsSync(configDir)) {
mkdirSync(configDir, { recursive: true });
}
const managed = new Map<string, string>();
if (config.oauthSessionSecret) {
managed.set('OAUTH_SESSION_SECRET', config.oauthSessionSecret);
}
if (config.oauthEnabled) {
// The public URL chosen during setup; without one, local access on the published port.
managed.set('OAUTH_ISSUER', config.oauthIssuer ?? `http://localhost:${config.port}`);
}
if (config.deploymentType === 'compose-bundle' && config.oauthEnabled) {
// Generate a strong random postgres password for the bundled database
managed.set('POSTGRES_PASSWORD', randomBytes(24).toString('base64url'));
}
if (config.deploymentType === 'external-db' && config.oauthEnabled && config.databaseUrl) {
// The compose file references it; the URL carries the database password
managed.set('OAUTH_STORAGE_POSTGRESQL_URL', envLiteralUrl(config.databaseUrl));
}
if (managed.size > 0) {
const envPath = join(configDir, '.env');
let existing = '';
if (existsSync(envPath)) {
// The mode applies only when the file is created: an existing .env is restricted
// first, so its secrets never land in a file other accounts on the host can read.
chmodSync(envPath, 0o600);
existing = readFileSync(envPath, 'utf8');
}
writeFileSync(envPath, mergeEnvFile(existing, managed), { encoding: 'utf8', mode: 0o600 });
}
}
/**
* Generated secrets keep the value already written: a new session secret would end every
* session, a new database password would not match the database initialized with the old.
*/
const GENERATED_ENV_KEYS = new Set(['OAUTH_SESSION_SECRET', 'POSTGRES_PASSWORD']);
/** Variable a `.env` line assigns, if any. */
function envLineKey(line: string): string | undefined {
return /^\s*(?:export\s+)?([A-Za-z_]\w*)\s*=/.exec(line)?.[1];
}
/**
* `.env` content with the `managed` entries set. Everything else (secrets named by instances,
* OAuth application credentials added by hand, comments) is kept in place.
*/
export function mergeEnvFile(existing: string, managed: ReadonlyMap<string, string>): string {
const written = new Set<string>();
const lines = existing === '' ? [] : existing.replace(/\n$/, '').split('\n');
const merged = lines.flatMap((line) => {
const key = envLineKey(line);
const value = key === undefined ? undefined : managed.get(key);
if (key === undefined || value === undefined) return [line];
// A repeated assignment of a managed key would override the value written here.
if (written.has(key)) return [];
written.add(key);
return [GENERATED_ENV_KEYS.has(key) ? line : `${key}=${value}`];
});
for (const [key, value] of managed) {
if (!written.has(key)) merged.push(`${key}=${value}`);
}
return merged.join('\n') + '\n';
}
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