feat: allow to pass docker compose configuration as string

src/index.ts

@@ -1,8 +1,9 @@
 import childProcess from 'child_process';
-
+import { Readable } from 'stream'
 export interface IDockerComposeOptions {
   cwd?: string;
   config?: string | string[];
+  configAsString?: string;
   log?: boolean;
   composeOptions?: string[] | (string | string[])[];
   commandOptions?: string[] | (string | string[])[];
@@ -67,8 +68,11 @@ const execCompose = (command, args, options: IDockerComposeOptions = {}): Promis
   const composeOptions = options.composeOptions || [];
   const commandOptions = options.commandOptions || [];
   let composeArgs = composeOptionsToArgs(composeOptions);
+  const isConfigProvidedAsString = !!options.configAsString;
+
+  const configArgs = isConfigProvidedAsString ? [ '-f', '-' ] : configToArgs(options.config);
 
-  composeArgs = composeArgs.concat(configToArgs(options.config).concat([ command ].concat(composeOptionsToArgs(commandOptions), args)));
+  composeArgs = composeArgs.concat(configArgs.concat([ command ].concat(composeOptionsToArgs(commandOptions), args)));
 
   const cwd = options.cwd;
   const env = options.env || undefined;
@@ -102,6 +106,11 @@ const execCompose = (command, args, options: IDockerComposeOptions = {}): Promis
     }
   });
 
+  if (isConfigProvidedAsString) {
+    childProc.stdin.write(options.configAsString);
+    childProc.stdin.end();
+  }
+
   if (options.log) {
     childProc.stdout.pipe(process.stdout);
     childProc.stderr.pipe(process.stderr);

test/index.test.ts

@@ -1,7 +1,7 @@
 import Docker from 'dockerode';
 import * as compose from '../src/index';
 import * as path from 'path';
-
+import { readFile } from 'fs'
 const docker = new Docker();
 
 // Docker commands, especially builds, can take some time. This makes sure that they can take the time they need.
@@ -302,6 +302,27 @@ test('ensure run and exec with command defined as array are working', async ():
   await compose.down({ cwd: path.join(__dirname), log: logOutput });
 });
 
+test('build accepts config as string', async (): Promise<void> => {
+  const configuration = await new Promise(function (resolve, reject) {
+    readFile(path.join(__dirname, 'docker-compose-2.yml'), function (err, content) {
+      if (err) {
+        return reject(err);
+      }
+      return resolve(content.toString());
+    })
+  });
+  const config = {
+    configAsString: <string> configuration,
+    log: logOutput
+  };
+
+  await compose.upAll(config);
+  const port = await compose.port('db', 5432, config);
+
+  expect(port.out).toMatch(/.*:[0-9]{1,5}/);
+  await compose.down(config);
+});
+
 test('build single service', async (): Promise<void> => {
   const opts = {
     cwd: path.join(__dirname),