Initial version

src/exec.ts

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+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

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+import * as os from 'os';
+import * as core from '@actions/core';
+import * as exec from './exec';
+import * as stateHelper from './state-helper';
+
+async function run(): Promise<void> {
+  try {
+    if (os.platform() !== 'linux') {
+      core.setFailed('Only supported on linux platform');
+      return;
+    }
+
+    const registry: string = core.getInput('registry');
+    stateHelper.setRegistry(registry);
+    stateHelper.setLogout(core.getInput('logout'));
+
+    const username: string = core.getInput('username');
+    const password: string = core.getInput('password', {required: true});
+
+    let loginArgs: Array<string> = ['login', '--password', password];
+    if (username) {
+      loginArgs.push('--username', username);
+    }
+    loginArgs.push(registry);
+
+    await exec.exec('docker', loginArgs, true).then(res => {
+      if (res.stderr != '' && !res.success) {
+        throw new Error(res.stderr);
+      }
+      core.info('🎉 Login Succeeded!');
+    });
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+async function logout(): Promise<void> {
+  if (!stateHelper.logout) {
+    return;
+  }
+  await exec.exec('docker', ['logout', stateHelper.registry], false).then(res => {
+    if (res.stderr != '' && !res.success) {
+      core.warning(res.stderr);
+    }
+  });
+}
+
+if (!stateHelper.IsPost) {
+  run();
+} else {
+  logout();
+}

src/state-helper.ts

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+import * as core from '@actions/core';
+
+export const IsPost = !!process.env['STATE_isPost'];
+export const registry = process.env['STATE_registry'] || '';
+export const logout = /true/i.test(process.env['STATE_logout'] || '');
+
+export function setRegistry(registry: string) {
+  core.saveState('registry', registry);
+}
+
+export function setLogout(logout: string) {
+  core.saveState('logout', logout);
+}
+
+if (!IsPost) {
+  core.saveState('isPost', 'true');
+}