Add bake-file output (#36)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/ci.yml

@@ -177,3 +177,38 @@ jobs:
         name: Dump context
         if: always()
         uses: crazy-max/ghaction-dump-context@v1
+
+  bake:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: docker_meta
+        uses: ./
+        with:
+          images: |
+            ${{ env.DOCKER_IMAGE }}
+            ghcr.io/name/app
+          tag-sha: true
+          tag-semver: |
+            {{version}}
+            {{major}}.{{minor}}
+            {{major}}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Build
+        uses: crazy-max/ghaction-docker-buildx-bake@v1
+        with:
+          files: |
+            ./test/docker-bake.hcl
+            ${{ steps.docker_meta.outputs.bake-file }}
+          targets: |
+            release

README.md

@@ -20,7 +20,7 @@ ___
 * [Usage](#usage)
   * [Basic](#basic)
   * [Semver](#semver)
-  * [Complete](#complete)
+  * [Bake definition](#bake-definition)
 * [Customizing](#customizing)
   * [inputs](#inputs)
   * [outputs](#outputs)
@@ -85,7 +85,7 @@ jobs:
       -
         name: Login to DockerHub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1 
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
@@ -147,7 +147,7 @@ jobs:
       -
         name: Login to DockerHub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1 
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
@@ -163,23 +163,29 @@ jobs:
           labels: ${{ steps.docker_meta.outputs.labels }}
 ```
 
-### Complete
+### Bake definition
 
-| Event           | Ref                           | Commit SHA | Docker Tags                             |
+This action also handles a bake definition file that can be used with the
-|-----------------|-------------------------------|------------|-----------------------------------------|
+[Docker Buildx Bake action](https://github.com/crazy-max/ghaction-docker-buildx-bake). You just have to declare a
-| `schedule`      | `refs/heads/master`           | `45f132a`  | `sha-45f132a`, `nightly`                |
+target named `ghaction-docker-meta`.
-| `pull_request`  | `refs/pull/2/merge`           | `a123b57`  | `sha-a123b57`, `pr-2`                   |
+
-| `push`          | `refs/heads/master`           | `cf20257`  | `sha-cf20257`, `master`                 |
+```hcl
-| `push`          | `refs/heads/my/branch`        | `a5df687`  | `sha-a5df687`, `my-branch`              |
+// docker-bake.hcl
-| `push tag`      | `refs/tags/v1.2.3`            | `ad132f5`  | `sha-ad132f5`, `1.2.3`, `1.2`, `latest` |
+
-| `push tag`      | `refs/tags/v2.0.8-beta.67`    | `fc89efd`  | `sha-fc89efd`, `2.0.8-beta.67`          |
+target "ghaction-docker-meta" {}
+
+target "build" {
+  inherits = ["ghaction-docker-meta"]
+  context = "./"
+  dockerfile = "Dockerfile"
+  platforms = ["linux/amd64", "linux/arm/v6", "linux/arm/v7", "linux/arm64", "linux/386", "linux/ppc64le"]
+}
+```
 
 ```yaml
 name: ci
 
 on:
-  schedule:
-    - cron: '0 10 * * *' # everyday at 10am
   push:
     branches:
       - '**'
@@ -211,22 +217,14 @@ jobs:
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       -
-        name: Login to DockerHub
+        name: Build
-        if: github.event_name != 'pull_request'
+        uses: crazy-max/ghaction-docker-buildx-bake@v1
-        uses: docker/login-action@v1 
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          files: |
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+            ./docker-bake.hcl
-      -
+            ${{ steps.docker_meta.outputs.bake-file }}
-        name: Build and push
+          targets: |
-        uses: docker/build-push-action@v2
+            build
-        with:
-          context: .
-          file: ./Dockerfile
-          platforms: linux/amd64,linux/arm64,linux/386
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.docker_meta.outputs.tags }}
-          labels: ${{ steps.docker_meta.outputs.labels }}
 ```
 
 ## Customizing
@@ -251,7 +249,7 @@ Following inputs can be used as `step.with` keys
 | Name                | Type     | Description                        |
 |---------------------|----------|------------------------------------|
 | `images`            | List/CSV | List of Docker images to use as base name for tags |
-| `tag-sha`           | Bool     | Add git short SHA as Docker tag (default `false`) |
+| `tag-sha`           | Bool     | Add git short commit as Docker tag (default `false`) |
 | `tag-edge`          | Bool     | Enable edge branch tagging (default `false`) |
 | `tag-edge-branch`   | String   | Branch that will be tagged as edge (default `repo.default_branch`) |
 | `tag-semver`        | List/CSV | Handle Git tag as semver [template](#handle-semver-tag) if possible |
@@ -273,9 +271,10 @@ Following outputs are available
 
 | Name          | Type    | Description                           |
 |---------------|---------|---------------------------------------|
-| `version`     | String  | Generated Docker image version |
+| `version`     | String  | Docker image version |
-| `tags`        | String  | Generated Docker tags |
+| `tags`        | String  | Docker tags |
-| `labels`      | String  | Generated Docker labels |
+| `labels`      | String  | Docker labels |
+| `bake-file`   | File    | [Bake definition file](https://github.com/docker/buildx#file-definition) path |
 
 ## Notes
 
@@ -327,7 +326,7 @@ the following expressions:
 
 | Expression              | Example                                   | Description                              |
 |-------------------------|-------------------------------------------|------------------------------------------|
-| `{{date 'format'}}`     | `{{date 'YYYYMMDD'}}` > `20200110`        | Render date by its [moment format](https://momentjs.com/docs/#/displaying/format/) 
+| `{{date 'format'}}`     | `{{date 'YYYYMMDD'}}` > `20200110`        | Render date by its [moment format](https://momentjs.com/docs/#/displaying/format/)
 
 You can find more examples in the [CI workflow](.github/workflows/ci.yml).
 
@@ -366,7 +365,7 @@ updates:
       interval: "daily"
 ```
 
-# Contributing
+## Contributing
 
 Want to contribute? Awesome! The most basic way to show your support is to star :star2: the project,
 or to raise issues :speech_balloon:. If you want to open a pull request, please read the

__tests__/context.test.ts

@@ -1,5 +1,16 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
 import * as context from '../src/context';
 
+jest.spyOn(context, 'tmpDir').mockImplementation((): string => {
+  const tmpDir = path.join('/tmp/.ghaction-docker-meta-jest').split(path.sep).join(path.posix.sep);
+  if (!fs.existsSync(tmpDir)) {
+    fs.mkdirSync(tmpDir, {recursive: true});
+  }
+  return tmpDir;
+});
+
 describe('getInputList', () => {
   it('single line correctly', async () => {
     await setInput('foo', 'bar');

__tests__/meta.test.ts

@@ -1484,3 +1484,244 @@ describe('custom', () => {
     ],
   ])('given %p event ', tagsLabelsTest);
 });
+
+describe('bake-file', () => {
+  // prettier-ignore
+  test.each([
+    [
+      'event_push.env',
+      {
+        images: ['user/app'],
+        tagCustom: ['my', 'custom', 'tags']
+      } as Inputs,
+      {
+        "target": {
+          "ghaction-docker-meta": {
+            "tags": [
+              "user/app:dev",
+              "user/app:my",
+              "user/app:custom",
+              "user/app:tags"
+            ],
+            "labels": {
+              "org.opencontainers.image.title": "Hello-World",
+              "org.opencontainers.image.description": "This your first repo!",
+              "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.version": "dev",
+              "org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
+              "org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
+              "org.opencontainers.image.licenses": "MIT"
+            }
+          }
+        }
+      }
+    ],
+    [
+      'event_push.env',
+      {
+        images: ['user/app'],
+        tagCustom: ['my']
+      } as Inputs,
+      {
+        "target": {
+          "ghaction-docker-meta": {
+            "tags": [
+              "user/app:dev",
+              "user/app:my",
+            ],
+            "labels": {
+              "org.opencontainers.image.title": "Hello-World",
+              "org.opencontainers.image.description": "This your first repo!",
+              "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.version": "dev",
+              "org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
+              "org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
+              "org.opencontainers.image.licenses": "MIT"
+            }
+          }
+        }
+      }
+    ],
+    [
+      'event_tag_release1.env',
+      {
+        images: ['user/app'],
+        tagCustom: ['my', 'custom', 'tags']
+      } as Inputs,
+      {
+        "target": {
+          "ghaction-docker-meta": {
+            "tags": [
+              "user/app:release1",
+              "user/app:my",
+              "user/app:custom",
+              "user/app:tags",
+              "user/app:latest"
+            ],
+            "labels": {
+              "org.opencontainers.image.title": "Hello-World",
+              "org.opencontainers.image.description": "This your first repo!",
+              "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.version": "release1",
+              "org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
+              "org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
+              "org.opencontainers.image.licenses": "MIT"
+            }
+          }
+        }
+      }
+    ],
+    [
+      'event_tag_20200110-RC2.env',
+      {
+        images: ['user/app'],
+        tagMatch: `\\d{8}`,
+        tagLatest: false,
+        tagCustom: ['my', 'custom', 'tags']
+      } as Inputs,
+      {
+        "target": {
+          "ghaction-docker-meta": {
+            "tags": [
+              "user/app:20200110",
+              "user/app:my",
+              "user/app:custom",
+              "user/app:tags"
+            ],
+            "labels": {
+              "org.opencontainers.image.title": "Hello-World",
+              "org.opencontainers.image.description": "This your first repo!",
+              "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.version": "20200110",
+              "org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
+              "org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
+              "org.opencontainers.image.licenses": "MIT"
+            }
+          }
+        }
+      }
+    ],
+    [
+      'event_tag_v1.1.1.env',
+      {
+        images: ['org/app', 'ghcr.io/user/app'],
+        tagSemver: ['{{version}}', '{{major}}.{{minor}}', '{{major}}'],
+        tagCustom: ['my', 'custom', 'tags']
+      } as Inputs,
+      {
+        "target": {
+          "ghaction-docker-meta": {
+            "tags": [
+              "org/app:1.1.1",
+              "org/app:1.1",
+              "org/app:1",
+              "org/app:my",
+              "org/app:custom",
+              "org/app:tags",
+              "org/app:latest",
+              "ghcr.io/user/app:1.1.1",
+              "ghcr.io/user/app:1.1",
+              "ghcr.io/user/app:1",
+              "ghcr.io/user/app:my",
+              "ghcr.io/user/app:custom",
+              "ghcr.io/user/app:tags",
+              "ghcr.io/user/app:latest"
+            ],
+            "labels": {
+              "org.opencontainers.image.title": "Hello-World",
+              "org.opencontainers.image.description": "This your first repo!",
+              "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.version": "1.1.1",
+              "org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
+              "org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
+              "org.opencontainers.image.licenses": "MIT"
+            }
+          }
+        }
+      }
+    ],
+    [
+      'event_tag_v1.1.1.env',
+      {
+        images: ['org/app', 'ghcr.io/user/app'],
+        tagSemver: ['{{version}}', '{{major}}.{{minor}}.{{patch}}'],
+        tagCustom: ['my', 'custom', 'tags'],
+        tagCustomOnly: true,
+      } as Inputs,
+      {
+        "target": {
+          "ghaction-docker-meta": {
+            "tags": [
+              "org/app:my",
+              "org/app:custom",
+              "org/app:tags",
+              "ghcr.io/user/app:my",
+              "ghcr.io/user/app:custom",
+              "ghcr.io/user/app:tags"
+            ],
+            "labels": {
+              "org.opencontainers.image.title": "Hello-World",
+              "org.opencontainers.image.description": "This your first repo!",
+              "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.version": "my",
+              "org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
+              "org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
+              "org.opencontainers.image.licenses": "MIT"
+            }
+          }
+        }
+      }
+    ],
+    [
+      'event_tag_v1.1.1.env',
+      {
+        images: ['org/app'],
+        labelCustom: [
+          "maintainer=CrazyMax",
+          "org.opencontainers.image.title=MyCustom=Title",
+          "org.opencontainers.image.description=Another description",
+          "org.opencontainers.image.vendor=MyCompany",
+        ],
+      } as Inputs,
+      {
+        "target": {
+          "ghaction-docker-meta": {
+            "tags": [
+              "org/app:v1.1.1",
+              "org/app:latest"
+            ],
+            "labels": {
+              "maintainer": "CrazyMax",
+              "org.opencontainers.image.title": "MyCustom=Title",
+              "org.opencontainers.image.description": "Another description",
+              "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
+              "org.opencontainers.image.vendor": "MyCompany",
+              "org.opencontainers.image.version": "v1.1.1",
+              "org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
+              "org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
+              "org.opencontainers.image.licenses": "MIT"
+            }
+          }
+        }
+      }
+    ]
+  ])('given %p event ', async (envFile: string, inputs: Inputs, exBakeDefinition: {}) => {
+    process.env = dotenv.parse(fs.readFileSync(path.join(__dirname, 'fixtures', envFile)));
+    const context = github.context();
+    console.log(process.env, context);
+
+    const repo = await github.repo(process.env.GITHUB_TOKEN || '');
+    const meta = new Meta({...getInputs(), ...inputs}, context, repo);
+
+    const bakeFile = meta.bakeFile();
+    console.log('bakeFile', bakeFile, fs.readFileSync(bakeFile, 'utf8'));
+    expect(JSON.parse(fs.readFileSync(bakeFile, 'utf8'))).toEqual(exBakeDefinition);
+  });
+});

action.yml

@@ -68,6 +68,8 @@ outputs:
     description: 'Generated Docker tags'
   labels:
     description: 'Generated Docker labels'
+  bake-file:
+    description: 'Bake definiton file'
 
 runs:
   using: 'node12'

dist/index.js

@@ -39,9 +39,20 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.asyncForEach = exports.getInputList = exports.getInputs = void 0;
+exports.asyncForEach = exports.getInputList = exports.getInputs = exports.tmpDir = void 0;
 const sync_1 = __importDefault(__webpack_require__(8750));
 const core = __importStar(__webpack_require__(2186));
+const fs = __importStar(__webpack_require__(5747));
+const os = __importStar(__webpack_require__(2087));
+const path = __importStar(__webpack_require__(5622));
+let _tmpDir;
+function tmpDir() {
+    if (!_tmpDir) {
+        _tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'ghaction-docker-meta-')).split(path.sep).join(path.posix.sep);
+    }
+    return _tmpDir;
+}
+exports.tmpDir = tmpDir;
 function getInputs() {
     return {
         images: getInputList('images'),
@@ -184,6 +195,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
+const fs = __importStar(__webpack_require__(5747));
 const context_1 = __webpack_require__(3842);
 const github = __importStar(__webpack_require__(5928));
 const meta_1 = __webpack_require__(3714);
@@ -213,6 +225,7 @@ function run() {
             core.info(version.main || '');
             core.endGroup();
             core.setOutput('version', version.main || '');
+            // Docker tags
             const tags = meta.tags();
             core.startGroup(`Docker tags`);
             for (let tag of tags) {
@@ -220,6 +233,7 @@ function run() {
             }
             core.endGroup();
             core.setOutput('tags', tags.join(inputs.sepTags));
+            // Docker labels
             const labels = meta.labels();
             core.startGroup(`Docker labels`);
             for (let label of labels) {
@@ -227,6 +241,12 @@ function run() {
             }
             core.endGroup();
             core.setOutput('labels', labels.join(inputs.sepLabels));
+            // Bake definition file
+            const bakeFile = meta.bakeFile();
+            core.startGroup(`Bake definition file`);
+            core.info(fs.readFileSync(bakeFile, 'utf8'));
+            core.endGroup();
+            core.setOutput('bake-file', bakeFile);
         }
         catch (error) {
             core.setFailed(error.message);
@@ -268,8 +288,11 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.Meta = void 0;
 const handlebars = __importStar(__webpack_require__(7492));
+const fs = __importStar(__webpack_require__(5747));
+const path = __importStar(__webpack_require__(5622));
 const moment_1 = __importDefault(__webpack_require__(9623));
 const semver = __importStar(__webpack_require__(1383));
+const context_1 = __webpack_require__(3842);
 const core = __importStar(__webpack_require__(2186));
 class Meta {
     constructor(inputs, context, repo) {
@@ -397,6 +420,26 @@ class Meta {
         labels.push(...this.inputs.labelCustom);
         return labels;
     }
+    bakeFile() {
+        let jsonLabels = {};
+        for (let label of this.labels()) {
+            const matches = label.match(/([^=]*)=(.*)/);
+            if (!matches) {
+                continue;
+            }
+            jsonLabels[matches[1]] = matches[2];
+        }
+        const bakeFile = path.join(context_1.tmpDir(), 'ghaction-docker-meta-bake.json').split(path.sep).join(path.posix.sep);
+        fs.writeFileSync(bakeFile, JSON.stringify({
+            target: {
+                'ghaction-docker-meta': {
+                    tags: this.tags(),
+                    labels: jsonLabels
+                }
+            }
+        }, null, 2));
+        return bakeFile;
+    }
 }
 exports.Meta = Meta;
 //# sourceMappingURL=meta.js.map

src/context.ts

@@ -1,5 +1,10 @@
 import csvparse from 'csv-parse/lib/sync';
 import * as core from '@actions/core';
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+
+let _tmpDir: string;
 
 export interface Inputs {
   images: string[];
@@ -19,6 +24,13 @@ export interface Inputs {
   githubToken: string;
 }
 
+export function tmpDir(): string {
+  if (!_tmpDir) {
+    _tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'ghaction-docker-meta-')).split(path.sep).join(path.posix.sep);
+  }
+  return _tmpDir;
+}
+
 export function getInputs(): Inputs {
   return {
     images: getInputList('images'),

src/main.ts

@@ -1,3 +1,4 @@
+import * as fs from 'fs';
 import {getInputs, Inputs} from './context';
 import * as github from './github';
 import {Meta, Version} from './meta';
@@ -33,6 +34,7 @@ async function run() {
     core.endGroup();
     core.setOutput('version', version.main || '');
 
+    // Docker tags
     const tags: Array<string> = meta.tags();
     core.startGroup(`Docker tags`);
     for (let tag of tags) {
@@ -41,6 +43,7 @@ async function run() {
     core.endGroup();
     core.setOutput('tags', tags.join(inputs.sepTags));
 
+    // Docker labels
     const labels: Array<string> = meta.labels();
     core.startGroup(`Docker labels`);
     for (let label of labels) {
@@ -48,6 +51,13 @@ async function run() {
     }
     core.endGroup();
     core.setOutput('labels', labels.join(inputs.sepLabels));
+
+    // Bake definition file
+    const bakeFile: string = meta.bakeFile();
+    core.startGroup(`Bake definition file`);
+    core.info(fs.readFileSync(bakeFile, 'utf8'));
+    core.endGroup();
+    core.setOutput('bake-file', bakeFile);
   } catch (error) {
     core.setFailed(error.message);
   }

src/meta.ts

@@ -1,7 +1,9 @@
 import * as handlebars from 'handlebars';
+import * as fs from 'fs';
+import * as path from 'path';
 import moment from 'moment';
 import * as semver from 'semver';
-import {Inputs} from './context';
+import {Inputs, tmpDir} from './context';
 import * as core from '@actions/core';
 import {Context} from '@actions/github/lib/context';
 import {ReposGetResponseData} from '@octokit/types';
@@ -143,4 +145,34 @@ export class Meta {
     labels.push(...this.inputs.labelCustom);
     return labels;
   }
+
+  public bakeFile(): string {
+    let jsonLabels = {};
+    for (let label of this.labels()) {
+      const matches = label.match(/([^=]*)=(.*)/);
+      if (!matches) {
+        continue;
+      }
+      jsonLabels[matches[1]] = matches[2];
+    }
+
+    const bakeFile = path.join(tmpDir(), 'ghaction-docker-meta-bake.json').split(path.sep).join(path.posix.sep);
+    fs.writeFileSync(
+      bakeFile,
+      JSON.stringify(
+        {
+          target: {
+            'ghaction-docker-meta': {
+              tags: this.tags(),
+              labels: jsonLabels
+            }
+          }
+        },
+        null,
+        2
+      )
+    );
+
+    return bakeFile;
+  }
 }

test/docker-bake.hcl

@@ -0,0 +1,38 @@
+target "ghaction-docker-meta" {}
+
+group "default" {
+  targets = ["db", "app"]
+}
+
+group "release" {
+  targets = ["db", "app-plus"]
+}
+
+target "db" {
+  context = "./test"
+  tags = ["docker.io/tonistiigi/db"]
+}
+
+target "app" {
+  inherits = ["ghaction-docker-meta"]
+  context = "./test"
+  dockerfile = "Dockerfile"
+  args = {
+    name = "foo"
+  }
+}
+
+target "cross" {
+  platforms = [
+    "linux/amd64",
+    "linux/arm64",
+    "linux/386"
+  ]
+}
+
+target "app-plus" {
+  inherits = ["app", "cross"]
+  args = {
+    IAMPLUS = "true"
+  }
+}