Standalone mode support

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

src/buildx.ts

@@ -107,9 +107,10 @@ export function hasGitAuthToken(secrets: string[]): boolean {
   return false;
 }
 
-export async function isAvailable(): Promise<boolean> {
+export async function isAvailable(standalone?: boolean): Promise<boolean> {
+  const cmd = getCommand([], standalone);
   return await exec
-    .getExecOutput('docker', ['buildx'], {
+    .getExecOutput(cmd.command, cmd.args, {
       ignoreReturnCode: true,
       silent: true
     })
@@ -118,12 +119,17 @@ export async function isAvailable(): Promise<boolean> {
         return false;
       }
       return res.exitCode == 0;
+    })
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    .catch(error => {
+      return false;
     });
 }
 
-export async function getVersion(): Promise<string> {
+export async function getVersion(standalone?: boolean): Promise<string> {
+  const cmd = getCommand(['version'], standalone);
   return await exec
-    .getExecOutput('docker', ['buildx', 'version'], {
+    .getExecOutput(cmd.command, cmd.args, {
       ignoreReturnCode: true,
       silent: true
     })
@@ -146,3 +152,10 @@ export function parseVersion(stdout: string): string {
 export function satisfies(version: string, range: string): boolean {
   return semver.satisfies(version, range) || /^[0-9a-f]{7}$/.exec(version) !== null;
 }
+
+export function getCommand(args: Array<string>, standalone?: boolean) {
+  return {
+    command: standalone ? 'buildx' : 'docker',
+    args: standalone ? args : ['buildx', ...args]
+  };
+}

src/context.ts

@@ -101,7 +101,6 @@ export async function getInputs(defaultContext: string): Promise<Inputs> {
 export async function getArgs(inputs: Inputs, defaultContext: string, buildxVersion: string): Promise<Array<string>> {
   // prettier-ignore
   return [
-    'buildx',
     ...await getBuildArgs(inputs, defaultContext, buildxVersion),
     ...await getCommonArgs(inputs, buildxVersion),
     handlebars.compile(inputs.context)({defaultContext})

src/docker.ts

@@ -0,0 +1,19 @@
+import * as exec from '@actions/exec';
+
+export async function isAvailable(): Promise<boolean> {
+  return await exec
+    .getExecOutput('docker', undefined, {
+      ignoreReturnCode: true,
+      silent: true
+    })
+    .then(res => {
+      if (res.stderr.length > 0 && res.exitCode != 0) {
+        return false;
+      }
+      return res.exitCode == 0;
+    })
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    .catch(error => {
+      return false;
+    });
+}

src/main.ts

@@ -1,30 +1,50 @@
 import * as fs from 'fs';
 import * as buildx from './buildx';
 import * as context from './context';
+import * as docker from './docker';
 import * as stateHelper from './state-helper';
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 
 async function run(): Promise<void> {
   try {
+    const defContext = context.defaultContext();
+    const inputs: context.Inputs = await context.getInputs(defContext);
+
+    // standalone if docker cli not available
+    const standalone = !(await docker.isAvailable());
+
     core.startGroup(`Docker info`);
-    await exec.exec('docker', ['version']);
-    await exec.exec('docker', ['info']);
+    if (standalone) {
+      core.info(`Docker info skipped in standalone mode`);
+    } else {
+      await exec.exec('docker', ['version'], {
+        failOnStdErr: false
+      });
+      await exec.exec('docker', ['info'], {
+        failOnStdErr: false
+      });
+    }
     core.endGroup();
 
-    if (!(await buildx.isAvailable())) {
+    if (!(await buildx.isAvailable(standalone))) {
       core.setFailed(`Docker buildx is required. See https://github.com/docker/setup-buildx-action to set up buildx.`);
       return;
     }
     stateHelper.setTmpDir(context.tmpDir());
 
-    const buildxVersion = await buildx.getVersion();
-    const defContext = context.defaultContext();
-    const inputs: context.Inputs = await context.getInputs(defContext);
+    const buildxVersion = await buildx.getVersion(standalone);
+    await core.group(`Buildx version`, async () => {
+      const versionCmd = buildx.getCommand(['version'], standalone);
+      await exec.exec(versionCmd.command, versionCmd.args, {
+        failOnStdErr: false
+      });
+    });
 
     const args: string[] = await context.getArgs(inputs, defContext, buildxVersion);
+    const buildCmd = buildx.getCommand(args, standalone);
     await exec
-      .getExecOutput('docker', args, {
+      .getExecOutput(buildCmd.command, buildCmd.args, {
         ignoreReturnCode: true
       })
       .then(res => {