Initial commit (docker/build-push-action#87)

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

src/exec.ts

@@ -0,0 +1,34 @@
+import * as actionsExec from '@actions/exec';
+import {ExecOptions} from '@actions/exec';
+
+export interface ExecResult {
+  success: boolean;
+  stdout: string;
+  stderr: string;
+}
+
+export const exec = async (command: string, args: string[] = [], silent: boolean): Promise<ExecResult> => {
+  let stdout: string = '';
+  let stderr: string = '';
+
+  const options: ExecOptions = {
+    silent: silent,
+    ignoreReturnCode: true
+  };
+  options.listeners = {
+    stdout: (data: Buffer) => {
+      stdout += data.toString();
+    },
+    stderr: (data: Buffer) => {
+      stderr += data.toString();
+    }
+  };
+
+  const returnCode: number = await actionsExec.exec(command, args, options);
+
+  return {
+    success: returnCode === 0,
+    stdout: stdout.trim(),
+    stderr: stderr.trim()
+  };
+};

src/main.ts

@@ -0,0 +1,38 @@
+import * as os from 'os';
+import * as mexec from './exec';
+import * as core from '@actions/core';
+import * as exec from '@actions/exec';
+
+interface Platforms {
+  supported: string[];
+  available: string[];
+}
+
+async function run(): Promise<void> {
+  try {
+    if (os.platform() !== 'linux') {
+      core.setFailed('Only supported on linux platform');
+      return;
+    }
+
+    const image: string = core.getInput('image') || 'tonistiigi/binfmt:latest';
+    const platforms: string = core.getInput('platforms') || 'all';
+
+    core.info(`💎 Installing QEMU static binaries...`);
+    await exec.exec('docker', ['run', '--rm', '--privileged', image, '--install', platforms]);
+
+    core.info('🛒 Extracting available platforms...');
+    await mexec.exec(`docker`, ['run', '--rm', '--privileged', image], true).then(res => {
+      if (res.stderr != '' && !res.success) {
+        throw new Error(res.stderr);
+      }
+      const platforms: Platforms = JSON.parse(res.stdout.trim());
+      core.info(`${platforms.supported.join(',')}`);
+      core.setOutput('platforms', platforms.supported.join(','));
+    });
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();