Add json output

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

.github/workflows/ci.yml

@@ -165,6 +165,30 @@ jobs:
             org.opencontainers.image.description=Another description
             org.opencontainers.image.vendor=MyCompany
 
+  json:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: meta
+        uses: ./
+        with:
+          images: |
+            ${{ env.DOCKER_IMAGE }}
+            ghcr.io/name/app
+          labels: |
+            maintainer=CrazyMax
+      -
+        name: JSON output
+        run: |
+          echo "maintainer=${{ fromJSON(steps.meta.outputs.json).labels['maintainer'] }}"
+          echo "version=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}"
+          echo "revision=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}"
+          echo "created=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}"
+
   docker-push:
     runs-on: ubuntu-latest
     services:

README.md

@@ -32,6 +32,7 @@ ___
   * [Latest tag](#latest-tag)
   * [Global expressions](#global-expressions)
   * [Major version zero](#major-version-zero)
+  * [JSON output object](#json-output-object)
   * [Overwrite labels](#overwrite-labels)
 * [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
 
@@ -274,6 +275,7 @@ Following outputs are available
 | `version`     | String  | Docker image version |
 | `tags`        | String  | Docker tags |
 | `labels`      | String  | Docker labels |
+| `json`        | String  | JSON output of tags and labels |
 | `bake-file`   | File    | [Bake definition file](https://github.com/docker/buildx#file-definition) path |
 
 ## `flavor` input
@@ -586,6 +588,30 @@ tags: |
   type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
 ```
 
+### JSON output object
+
+The `json` output is a JSON object composed of the generated tags and labels so that you can reuse them further in your
+workflow using the [`fromJSON` function](https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#fromjson):
+
+```yaml
+      -
+        name: Docker meta
+        uses: docker/metadata-action@v3
+        id: meta
+        with:
+          images: name/app
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            BUILDTIME=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
+            VERSION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}
+            REVISION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}
+```
+
 ### Overwrite labels
 
 If some of the [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)
@@ -594,7 +620,7 @@ labels generated are not suitable, you can overwrite them like this:
 ```yaml
       -
         name: Docker meta
-        id: docker_meta
+        id: meta
         uses: docker/metadata-action@v3
         with:
           images: name/app

__tests__/meta.test.ts

@@ -2394,6 +2394,258 @@ describe('raw', () => {
   ])('given %p wth %p event', tagsLabelsTest);
 });
 
+describe('json', () => {
+  // prettier-ignore
+  test.each([
+    [
+      'json01',
+      'event_push.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=ref,event=branch`,
+          `type=raw,my`,
+          `type=raw,custom`,
+          `type=raw,tags`
+        ],
+        labels: [
+          "invalid"
+        ]
+      } as Inputs,
+      {
+        "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"
+        }
+      }
+    ],
+    [
+      'json02',
+      'event_push.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=ref,event=branch`,
+          `type=raw,my`
+        ]
+      } as Inputs,
+      {
+        "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"
+        }
+      }
+    ],
+    [
+      'json03',
+      'event_tag_release1.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=ref,event=tag`,
+          `type=raw,my`,
+          `type=raw,custom`,
+          `type=raw,tags`
+        ],
+        bakeTarget: "meta"
+      } as Inputs,
+      {
+        "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"
+        }
+      }
+    ],
+    [
+      'json04',
+      'event_tag_20200110-RC2.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=match,pattern=\\d{8}`,
+          `type=raw,my`,
+          `type=raw,custom`,
+          `type=raw,tags`
+        ],
+        flavor: [
+          `latest=false`
+        ]
+      } as Inputs,
+      {
+        "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"
+        }
+      }
+    ],
+    [
+      'json05',
+      'event_tag_v1.1.1.env',
+      {
+        images: ['org/app', 'ghcr.io/user/app'],
+        tags: [
+          `type=semver,pattern={{version}}`,
+          `type=semver,pattern={{major}}.{{minor}}`,
+          `type=semver,pattern={{major}}`,
+          `type=raw,my`,
+          `type=raw,custom`,
+          `type=raw,tags`
+        ]
+      } as Inputs,
+      {
+        "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"
+        }
+      }
+    ],
+    [
+      'json06',
+      'event_tag_v1.1.1.env',
+      {
+        images: ['org/app', 'ghcr.io/user/app'],
+        tags: [
+          `type=raw,my`,
+          `type=raw,custom`,
+          `type=raw,tags`
+        ]
+      } as Inputs,
+      {
+        "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"
+        }
+      }
+    ],
+    [
+      'json07',
+      'event_tag_v1.1.1.env',
+      {
+        images: ['org/app'],
+        labels: [
+          "foo",
+          "maintainer=CrazyMax",
+          "org.opencontainers.image.title=MyCustom=Title",
+          "org.opencontainers.image.description=Another description",
+          "org.opencontainers.image.vendor=MyCompany",
+        ],
+      } as Inputs,
+      {
+        "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 with %p event', async (name: string, envFile: string, inputs: Inputs, exJSON: {}) => {
+    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 jsonOutput = meta.getJSON();
+    console.log('json', jsonOutput);
+    expect(jsonOutput).toEqual(exJSON);
+  });
+});
+
 describe('bake', () => {
   // prettier-ignore
   test.each([

dist/index.js

@@ -321,6 +321,12 @@ function run() {
             }
             core.endGroup();
             context_1.setOutput('labels', labels.join(inputs.sepLabels));
+            // JSON
+            const jsonOutput = meta.getJSON();
+            core.startGroup(`JSON output`);
+            core.info(JSON.stringify(jsonOutput, null, 2));
+            core.endGroup();
+            context_1.setOutput('json', jsonOutput);
             // Bake definition file
             const bakeFile = meta.getBakeFile();
             core.startGroup(`Bake definition file`);
@@ -644,21 +650,33 @@ class Meta {
         labels.push(...this.inputs.labels);
         return labels;
     }
+    getJSON() {
+        return {
+            tags: this.getTags(),
+            labels: this.getLabels().reduce((res, label) => {
+                const matches = label.match(/([^=]*)=(.*)/);
+                if (!matches) {
+                    return res;
+                }
+                res[matches[1]] = matches[2];
+                return res;
+            }, {})
+        };
+    }
     getBakeFile() {
-        let jsonLabels = {};
-        for (let label of this.getLabels()) {
-            const matches = label.match(/([^=]*)=(.*)/);
-            if (!matches) {
-                continue;
-            }
-            jsonLabels[matches[1]] = matches[2];
-        }
         const bakeFile = path.join(context_1.tmpDir(), 'docker-metadata-action-bake.json').split(path.sep).join(path.posix.sep);
         fs.writeFileSync(bakeFile, JSON.stringify({
             target: {
                 [this.inputs.bakeTarget]: {
                     tags: this.getTags(),
-                    labels: jsonLabels,
+                    labels: this.getLabels().reduce((res, label) => {
+                        const matches = label.match(/([^=]*)=(.*)/);
+                        if (!matches) {
+                            return res;
+                        }
+                        res[matches[1]] = matches[2];
+                        return res;
+                    }, {}),
                     args: {
                         DOCKER_META_IMAGES: this.inputs.images.join(','),
                         DOCKER_META_VERSION: this.version.main

src/main.ts

@@ -60,6 +60,13 @@ async function run() {
     core.endGroup();
     setOutput('labels', labels.join(inputs.sepLabels));
 
+    // JSON
+    const jsonOutput = meta.getJSON();
+    core.startGroup(`JSON output`);
+    core.info(JSON.stringify(jsonOutput, null, 2));
+    core.endGroup();
+    setOutput('json', jsonOutput);
+
     // Bake definition file
     const bakeFile: string = meta.getBakeFile();
     core.startGroup(`Bake definition file`);

src/meta.ts

@@ -318,16 +318,21 @@ export class Meta {
     return labels;
   }
 
-  public getBakeFile(): string {
+  public getJSON(): {} {
-    let jsonLabels = {};
+    return {
-    for (let label of this.getLabels()) {
+      tags: this.getTags(),
-      const matches = label.match(/([^=]*)=(.*)/);
+      labels: this.getLabels().reduce((res, label) => {
-      if (!matches) {
+        const matches = label.match(/([^=]*)=(.*)/);
-        continue;
+        if (!matches) {
-      }
+          return res;
-      jsonLabels[matches[1]] = matches[2];
+        }
-    }
+        res[matches[1]] = matches[2];
+        return res;
+      }, {})
+    };
+  }
 
+  public getBakeFile(): string {
     const bakeFile = path.join(tmpDir(), 'docker-metadata-action-bake.json').split(path.sep).join(path.posix.sep);
     fs.writeFileSync(
       bakeFile,
@@ -336,7 +341,14 @@ export class Meta {
           target: {
             [this.inputs.bakeTarget]: {
               tags: this.getTags(),
-              labels: jsonLabels,
+              labels: this.getLabels().reduce((res, label) => {
+                const matches = label.match(/([^=]*)=(.*)/);
+                if (!matches) {
+                  return res;
+                }
+                res[matches[1]] = matches[2];
+                return res;
+              }, {}),
               args: {
                 DOCKER_META_IMAGES: this.inputs.images.join(','),
                 DOCKER_META_VERSION: this.version.main