feat: Adds retry functionality to handle transient build failures with configurable parameters.

README.md

@@ -153,6 +153,28 @@ jobs:
           tags: user/app:latest
 ```
 
+### Retry on failure
+
+Build can be configured to retry on failure with configurable attempts, wait time, and timeout:
+
+```yaml
+      -
+        name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: user/app:latest
+          max-attempts: 3
+          retry-wait-seconds: 30
+          timeout-minutes: 10
+```
+
+This configuration will:
+- Make up to 3 attempts to build (initial attempt + 2 retries)
+- Wait 30 seconds between each retry attempt
+- Timeout each attempt after 10 minutes
+
 ## Examples
 
 * [Multi-platform image](https://docs.docker.com/build/ci/github-actions/multi-platform/)
@@ -258,6 +280,9 @@ The following inputs can be used as `step.with` keys:
 | `target`           | String      | Sets the target stage to build                                                                                                                                                    |
 | `ulimit`           | List        | [Ulimit](https://docs.docker.com/engine/reference/commandline/buildx_build/#ulimit) options (e.g., `nofile=1024:1024`)                                                            |
 | `github-token`     | String      | GitHub Token used to authenticate against a repository for [Git context](#git-context) (default `${{ github.token }}`)                                                            |
+| `max-attempts`     | Number      | Maximum number of build attempts (including initial attempt) (default `1`)                                                                                                        |
+| `retry-wait-seconds` | Number    | Number of seconds to wait between retry attempts (default `5`)                                                                                                                    |
+| `timeout-minutes`  | Number      | Timeout for each build attempt in minutes, `0` means no timeout (default `0`)                                                                                                     |
 
 ### outputs
 

__tests__/context.test.ts

@@ -879,6 +879,77 @@ ANOTHER_SECRET=ANOTHER_SECRET_ENV`]
   );
 });
 
+describe('getInputs', () => {
+  beforeEach(() => {
+    process.env = Object.keys(process.env).reduce((object, key) => {
+      if (!key.startsWith('INPUT_')) {
+        object[key] = process.env[key];
+      }
+      return object;
+    }, {});
+  });
+
+  test('should parse retry inputs with default values', async () => {
+    setInput('context', '.');
+    setInput('load', 'false');
+    setInput('no-cache', 'false');
+    setInput('push', 'false');
+    setInput('pull', 'false');
+    setInput('max-attempts', '1');
+    setInput('retry-wait-seconds', '5');
+    setInput('timeout-minutes', '0');
+
+    const inputs = await context.getInputs();
+    expect(inputs['max-attempts']).toBe(1);
+    expect(inputs['retry-wait-seconds']).toBe(5);
+    expect(inputs['timeout-minutes']).toBe(0);
+  });
+
+  test('should parse retry inputs with custom values', async () => {
+    setInput('context', '.');
+    setInput('max-attempts', '3');
+    setInput('retry-wait-seconds', '30');
+    setInput('timeout-minutes', '10');
+    setInput('load', 'false');
+    setInput('no-cache', 'false');
+    setInput('push', 'false');
+    setInput('pull', 'false');
+
+    const inputs = await context.getInputs();
+    expect(inputs['max-attempts']).toBe(3);
+    expect(inputs['retry-wait-seconds']).toBe(30);
+    expect(inputs['timeout-minutes']).toBe(10);
+  });
+
+  test('should parse invalid retry inputs as NaN', async () => {
+    setInput('context', '.');
+    setInput('max-attempts', 'invalid');
+    setInput('retry-wait-seconds', 'abc');
+    setInput('load', 'false');
+    setInput('no-cache', 'false');
+    setInput('push', 'false');
+    setInput('pull', 'false');
+
+    const inputs = await context.getInputs();
+    expect(isNaN(inputs['max-attempts'])).toBe(true);
+    expect(isNaN(inputs['retry-wait-seconds'])).toBe(true);
+  });
+
+  test('should parse negative and zero values', async () => {
+    setInput('context', '.');
+    setInput('max-attempts', '0');
+    setInput('retry-wait-seconds', '-10');
+    setInput('load', 'false');
+    setInput('no-cache', 'false');
+    setInput('push', 'false');
+    setInput('pull', 'false');
+
+    const inputs = await context.getInputs();
+    expect(inputs['max-attempts']).toBe(0);
+    expect(inputs['retry-wait-seconds']).toBe(-10);
+  });
+});
+
 // See: https://github.com/actions/toolkit/blob/a1b068ec31a042ff1e10a522d8fdf0b8869d53ca/packages/core/src/core.ts#L89
 function getInputName(name: string): string {
   return `INPUT_${name.replace(/ /g, '_').toUpperCase()}`;

action.yml

@@ -111,6 +111,18 @@ inputs:
     description: "GitHub Token used to authenticate against a repository for Git context"
     default: ${{ github.token }}
     required: false
+  max-attempts:
+    description: "Maximum number of build attempts (including initial attempt)"
+    required: false
+    default: '1'
+  retry-wait-seconds:
+    description: "Number of seconds to wait between retry attempts"
+    required: false
+    default: '5'
+  timeout-minutes:
+    description: "Timeout for each build attempt in minutes (0 means no timeout)"
+    required: false
+    default: '0'
 
 outputs:
   imageid:

src/context.ts

@@ -41,6 +41,9 @@ export interface Inputs {
   target: string;
   ulimit: string[];
   'github-token': string;
+  'max-attempts': number;
+  'retry-wait-seconds': number;
+  'timeout-minutes': number;
 }
 
 export async function getInputs(): Promise<Inputs> {
@@ -77,7 +80,10 @@ export async function getInputs(): Promise<Inputs> {
     tags: Util.getInputList('tags'),
     target: core.getInput('target'),
     ulimit: Util.getInputList('ulimit', {ignoreComma: true}),
-    'github-token': core.getInput('github-token')
+    'github-token': core.getInput('github-token'),
+    'max-attempts': Util.getInputNumber('max-attempts') ?? 1,
+    'retry-wait-seconds': Util.getInputNumber('retry-wait-seconds') ?? 5,
+    'timeout-minutes': Util.getInputNumber('timeout-minutes') ?? 0
   };
 }
 

src/main.ts

@@ -97,25 +97,7 @@ actionsToolkit.run(
     core.debug(`buildCmd.command: ${buildCmd.command}`);
     core.debug(`buildCmd.args: ${JSON.stringify(buildCmd.args)}`);
 
-    let err: Error | undefined;
-    await Exec.getExecOutput(buildCmd.command, buildCmd.args, {
-      ignoreReturnCode: true,
-      env: Object.assign({}, process.env, {
-        BUILDX_METADATA_WARNINGS: 'true'
-      }) as {
-        [key: string]: string;
-      }
-    }).then(res => {
-      if (res.exitCode != 0) {
-        if (inputs.call && inputs.call === 'check' && res.stdout.length > 0) {
-          // checks warnings are printed to stdout: https://github.com/docker/buildx/pull/2647
-          // take the first line with the message summaryzing the warnings
-          err = new Error(res.stdout.split('\n')[0]?.trim());
-        } else if (res.stderr.length > 0) {
-          err = new Error(`buildx failed with: ${res.stderr.match(/(.*)\s*$/)?.[0]?.trim() ?? 'unknown error'}`);
-        }
-      }
-    });
+    await executeBuildWithRetry(buildCmd, inputs);
 
     const imageID = toolkit.buildxBuild.resolveImageID();
     const metadata = toolkit.buildxBuild.resolveMetadata();
@@ -182,10 +164,6 @@ actionsToolkit.run(
         stateHelper.setSummarySupported();
       }
     });
-
-    if (err) {
-      throw err;
-    }
   },
   // post
   async () => {
@@ -238,6 +216,89 @@ actionsToolkit.run(
   }
 );
 
+async function executeBuildWithRetry(buildCmd: {command: string; args: string[]}, inputs: context.Inputs): Promise<void> {
+  // Validate and sanitize retry inputs
+  let maxAttempts = inputs['max-attempts'];
+  if (isNaN(maxAttempts) || maxAttempts < 1) {
+    core.warning(`Invalid max-attempts value '${inputs['max-attempts']}'. Using default: 1`);
+    maxAttempts = 1;
+  }
+
+  let retryWaitSeconds = inputs['retry-wait-seconds'];
+  if (isNaN(retryWaitSeconds) || retryWaitSeconds < 0) {
+    core.warning(`Invalid retry-wait-seconds value '${inputs['retry-wait-seconds']}'. Using default: 5`);
+    retryWaitSeconds = 5;
+  }
+
+  let timeoutMinutes = inputs['timeout-minutes'];
+  if (isNaN(timeoutMinutes) || timeoutMinutes < 0) {
+    core.warning(`Invalid timeout-minutes value '${inputs['timeout-minutes']}'. Using default: 0`);
+    timeoutMinutes = 0;
+  }
+
+  let lastError: Error | undefined;
+
+  for (let attempt = 1; attempt <= maxAttempts; attempt++) {
+    try {
+      if (maxAttempts > 1) {
+        core.info(`Build attempt ${attempt} of ${maxAttempts}`);
+      }
+
+      await executeBuildWithTimeout(buildCmd, inputs, timeoutMinutes);
+      return;
+    } catch (error) {
+      lastError = error as Error;
+      core.warning(`Build failed on attempt ${attempt}: ${lastError.message}`);
+
+      if (attempt < maxAttempts) {
+        if (retryWaitSeconds > 0) {
+          core.info(`Retrying in ${retryWaitSeconds} seconds...`);
+          await new Promise(resolve => setTimeout(resolve, retryWaitSeconds * 1000));
+        } else {
+          core.info('Retrying immediately...');
+        }
+      }
+    }
+  }
+
+  if (lastError) {
+    core.error(`All ${maxAttempts} attempts failed`);
+    throw lastError;
+  }
+}
+
+async function executeBuildWithTimeout(buildCmd: {command: string; args: string[]}, inputs: context.Inputs, timeoutMinutes: number): Promise<void> {
+  const buildPromise = Exec.getExecOutput(buildCmd.command, buildCmd.args, {
+    ignoreReturnCode: true,
+    env: Object.assign({}, process.env, {
+      BUILDX_METADATA_WARNINGS: 'true'
+    }) as {
+      [key: string]: string;
+    }
+  }).then(res => {
+    if (res.exitCode != 0) {
+      if (inputs.call && inputs.call === 'check' && res.stdout.length > 0) {
+        throw new Error(res.stdout.split('\n')[0]?.trim());
+      } else if (res.stderr.length > 0) {
+        throw new Error(`buildx failed with: ${res.stderr.match(/(.*)\s*$/)?.[0]?.trim() ?? 'unknown error'}`);
+      } else {
+        throw new Error('buildx failed with unknown error');
+      }
+    }
+  });
+
+  if (timeoutMinutes <= 0) {
+    return buildPromise;
+  }
+
+  let timeoutHandle: NodeJS.Timeout;
+  const timeoutPromise = new Promise<void>((_, reject) => {
+    timeoutHandle = setTimeout(() => reject(new Error(`Build attempt timed out after ${timeoutMinutes} minutes`)), timeoutMinutes * 60 * 1000);
+  });
+
+  return Promise.race([buildPromise, timeoutPromise]).finally(() => clearTimeout(timeoutHandle));
+}
+
 async function buildRef(toolkit: Toolkit, since: Date, builder?: string): Promise<string> {
   // get ref from metadata file
   const ref = toolkit.buildxBuild.resolveRef();