annotations support

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

.github/workflows/ci.yml

@@ -383,3 +383,47 @@ jobs:
             DOCKER_METADATA_OUTPUT_TAGS
             DOCKER_METADATA_OUTPUT_LABELS
             DOCKER_METADATA_OUTPUT_JSON
+
+  bake-annotations:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Docker meta
+        id: docker_meta
+        uses: ./
+        with:
+          images: |
+            ${{ env.DOCKER_IMAGE }}
+            ghcr.io/name/app
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+        env:
+          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          version: v0.12.0-rc1
+      -
+        name: Build
+        uses: docker/bake-action@v4
+        with:
+          files: |
+            ./test/docker-bake.hcl
+            ${{ steps.docker_meta.outputs.bake-file-tags }}
+            ${{ steps.docker_meta.outputs.bake-file-annotations }}
+          targets: |
+            release

README.md

@@ -48,6 +48,7 @@ ___
   * [Major version zero](#major-version-zero)
   * [JSON output object](#json-output-object)
   * [Overwrite labels](#overwrite-labels)
+  * [Annotations](#annotations)
 * [Contributing](#contributing)
 
 ## Usage
@@ -307,23 +308,27 @@ The following inputs can be used as `step.with` keys:
 
 The following outputs are available:
 
-| Name               | Type   | Description                                                                                     |
+| Name                    | Type   | Description                                                                                                                                                     |
-|--------------------|--------|-------------------------------------------------------------------------------------------------|
+|-------------------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| `version`          | String | Docker image version                                                                            |
+| `version`               | String | Docker image version                                                                                                                                            |
-| `tags`             | String | Docker tags                                                                                     |
+| `tags`                  | String | Docker tags                                                                                                                                                     |
-| `labels`           | String | Docker labels                                                                                   |
+| `labels`                | String | Docker labels                                                                                                                                                   |
-| `json`             | String | JSON output of tags and labels                                                                  |
+| `annotations`           | String | [Annotations](https://github.com/moby/buildkit/blob/master/docs/annotations.md)                                                                                 |
-| `bake-file-tags`   | File   | [Bake file definition](https://docs.docker.com/build/bake/reference/) path with tags            |
+| `json`                  | String | JSON output of tags and labels                                                                                                                                  |
-| `bake-file-labels` | File   | [Bake file definition](https://docs.docker.com/build/bake/reference/) path with labels          |
+| `bake-file-tags`        | File   | [Bake file definition](https://docs.docker.com/build/bake/reference/) path with tags                                                                            |
+| `bake-file-labels`      | File   | [Bake file definition](https://docs.docker.com/build/bake/reference/) path with labels                                                                          |
+| `bake-file-annotations` | File   | [Bake file definition](https://docs.docker.com/build/bake/reference/) path with [annotations](https://github.com/moby/buildkit/blob/master/docs/annotations.md) |
 
 Alternatively, each output is also exported as an environment variable:
 
 * `DOCKER_METADATA_OUTPUT_VERSION`
 * `DOCKER_METADATA_OUTPUT_TAGS`
 * `DOCKER_METADATA_OUTPUT_LABELS`
+* `DOCKER_METADATA_OUTPUT_ANNOTATIONS`
 * `DOCKER_METADATA_OUTPUT_JSON`
 * `DOCKER_METADATA_OUTPUT_BAKE_FILE_TAGS`
 * `DOCKER_METADATA_OUTPUT_BAKE_FILE_LABELS`
+* `DOCKER_METADATA_OUTPUT_BAKE_FILE_ANNOTATIONS`
 
 So it can be used with our [Docker Build Push action](https://github.com/docker/build-push-action/):
 
@@ -336,9 +341,10 @@ So it can be used with our [Docker Build Push action](https://github.com/docker/
 
 ### environment variables
 
-| Name                          | Type | Description                                                                                                |
+| Name                                 | Type   | Description                                                                                                |
-|-------------------------------|------|------------------------------------------------------------------------------------------------------------|
+|--------------------------------------|--------|------------------------------------------------------------------------------------------------------------|
-| `DOCKER_METADATA_PR_HEAD_SHA` | Bool | If `true`, set associated head SHA instead of commit SHA that triggered the workflow on pull request event |
+| `DOCKER_METADATA_PR_HEAD_SHA`        | Bool   | If `true`, set associated head SHA instead of commit SHA that triggered the workflow on pull request event |
+| `DOCKER_METADATA_ANNOTATIONS_LEVELS` | String | Comma separated list of annotations levels to set for annotations output separated (default `manifest`)    |
 
 ## `context` input
 
@@ -904,6 +910,70 @@ labels generated are not suitable, you can overwrite them like this:
             org.opencontainers.image.vendor=MyCompany
 ```
 
+### Annotations
+
+Since Buildx 0.12, it is possible to set annotations to your image through the
+`--annotation` flag.
+
+With the [`build-push-action`](https://github.com/docker/build-push-action/),
+you can set the `annotations` input with the value of the `annotations` output
+of the `metadata-action`:
+
+```yaml
+      -
+        name: Docker meta
+        uses: docker/metadata-action@v5
+        with:
+          images: name/app
+      -
+        name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          tags: ${{ steps.meta.outputs.tags }}
+          annotations: ${{ steps.meta.outputs.annotations }}
+```
+
+The same can be done with the [`bake-action`](https://github.com/docker/bake-action/):
+
+```yaml
+      -
+        name: Docker meta
+        uses: docker/metadata-action@v5
+        with:
+          images: name/app
+      -
+        name: Build
+        uses: docker/bake-action@v3
+        with:
+          files: |
+            ./docker-bake.hcl
+            ${{ steps.meta.outputs.bake-file-tags }}
+            ${{ steps.meta.outputs.bake-file-annotations }}
+          targets: build
+```
+
+If you want to set specific level(s) for your annotations, you can use the
+[`DOCKER_METADATA_ANNOTATIONS_LEVELS` environment variable](#environment-variables)
+with a comma separated list of levels (defaults to `manifest`):
+
+```yaml
+      -
+        name: Docker meta
+        uses: docker/metadata-action@v5
+        with:
+          images: name/app
+        env:
+          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
+      -
+        name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          tags: ${{ steps.meta.outputs.tags }}
+          annotations: ${{ steps.meta.outputs.annotations }}
+```
+
+More information about annotations in the [BuildKit documentation](https://github.com/moby/buildkit/blob/master/docs/annotations.md).
+
 ## Contributing
 
 Want to contribute? Awesome! You can find information about contributing to

__tests__/meta.test.ts

@@ -3503,7 +3503,18 @@ describe('json', () => {
           "org.opencontainers.image.title": "Hello-World",
           "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
           "org.opencontainers.image.version": "dev"
-        }
+        },
+        "annotations": [
+          "manifest:foo=",
+          "manifest:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+          "manifest:org.opencontainers.image.description=This your first repo!",
+          "manifest:org.opencontainers.image.licenses=MIT",
+          "manifest:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+          "manifest:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.title=Hello-World",
+          "manifest:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.version=dev"
+        ]
       }
     ],
     [
@@ -3530,7 +3541,17 @@ describe('json', () => {
           "org.opencontainers.image.title": "Hello-World",
           "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
           "org.opencontainers.image.version": "dev"
-        }
+        },
+        "annotations": [
+          "manifest:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+          "manifest:org.opencontainers.image.description=This your first repo!",
+          "manifest:org.opencontainers.image.licenses=MIT",
+          "manifest:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+          "manifest:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.title=Hello-World",
+          "manifest:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.version=dev"
+        ]
       }
     ],
     [
@@ -3563,7 +3584,17 @@ describe('json', () => {
           "org.opencontainers.image.title": "Hello-World",
           "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
           "org.opencontainers.image.version": "release1"
-        }
+        },
+        "annotations": [
+          "manifest:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+          "manifest:org.opencontainers.image.description=This your first repo!",
+          "manifest:org.opencontainers.image.licenses=MIT",
+          "manifest:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+          "manifest:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.title=Hello-World",
+          "manifest:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.version=release1"
+        ]
       }
     ],
     [
@@ -3597,7 +3628,17 @@ describe('json', () => {
           "org.opencontainers.image.title": "Hello-World",
           "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
           "org.opencontainers.image.version": "20200110"
-        }
+        },
+        "annotations": [
+          "manifest:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+          "manifest:org.opencontainers.image.description=This your first repo!",
+          "manifest:org.opencontainers.image.licenses=MIT",
+          "manifest:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+          "manifest:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.title=Hello-World",
+          "manifest:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.version=20200110"
+        ]
       }
     ],
     [
@@ -3640,7 +3681,17 @@ describe('json', () => {
           "org.opencontainers.image.title": "Hello-World",
           "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
           "org.opencontainers.image.version": "1.1.1"
-        }
+        },
+        "annotations": [
+          "manifest:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+          "manifest:org.opencontainers.image.description=This your first repo!",
+          "manifest:org.opencontainers.image.licenses=MIT",
+          "manifest:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+          "manifest:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.title=Hello-World",
+          "manifest:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.version=1.1.1"
+        ]
       }
     ],
     [
@@ -3672,7 +3723,17 @@ describe('json', () => {
           "org.opencontainers.image.title": "Hello-World",
           "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
           "org.opencontainers.image.version": "my"
-        }
+        },
+        "annotations": [
+          "manifest:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+          "manifest:org.opencontainers.image.description=This your first repo!",
+          "manifest:org.opencontainers.image.licenses=MIT",
+          "manifest:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+          "manifest:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.title=Hello-World",
+          "manifest:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.version=my"
+        ]
       }
     ],
     [
@@ -3704,7 +3765,19 @@ describe('json', () => {
           "org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
           "org.opencontainers.image.vendor": "MyCompany",
           "org.opencontainers.image.version": "v1.1.1"
-        }
+        },
+        "annotations": [
+          "manifest:maintainer=CrazyMax",
+          "manifest:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+          "manifest:org.opencontainers.image.description=Another description",
+          "manifest:org.opencontainers.image.licenses=MIT",
+          "manifest:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+          "manifest:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.title=MyCustom=Title",
+          "manifest:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+          "manifest:org.opencontainers.image.vendor=MyCompany",
+          "manifest:org.opencontainers.image.version=v1.1.1"
+        ]
       }
     ]
   ])('given %p with %p event', async (name: string, envFile: string, inputs: Inputs, exJSON: unknown) => {
@@ -3714,7 +3787,7 @@ describe('json', () => {
     const repo = await toolkit.github.repoData();
     const meta = new Meta({...getInputs(), ...inputs}, await getContext(ContextSource.workflow), repo);
 
-    const jsonOutput = meta.getJSON();
+    const jsonOutput = meta.getJSON(['manifest']);
     expect(jsonOutput).toEqual(exJSON);
   });
 });
@@ -3769,6 +3842,30 @@ describe('bakeFile', () => {
             }
           }
         }
+      },
+      {
+        "target": {
+          "docker-metadata-action": {
+            "annotations": [
+              "index:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "index:org.opencontainers.image.description=This your first repo!",
+              "index:org.opencontainers.image.licenses=MIT",
+              "index:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "index:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.title=Hello-World",
+              "index:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.version=dev",
+              "manifest-descriptor:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "manifest-descriptor:org.opencontainers.image.description=This your first repo!",
+              "manifest-descriptor:org.opencontainers.image.licenses=MIT",
+              "manifest-descriptor:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "manifest-descriptor:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.title=Hello-World",
+              "manifest-descriptor:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.version=dev"
+            ]
+          }
+        }
       }
     ],
     [
@@ -3810,6 +3907,30 @@ describe('bakeFile', () => {
             }
           }
         }
+      },
+      {
+        "target": {
+          "docker-metadata-action": {
+            "annotations": [
+              "index:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "index:org.opencontainers.image.description=This your first repo!",
+              "index:org.opencontainers.image.licenses=MIT",
+              "index:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "index:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.title=Hello-World",
+              "index:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.version=dev",
+              "manifest-descriptor:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "manifest-descriptor:org.opencontainers.image.description=This your first repo!",
+              "manifest-descriptor:org.opencontainers.image.licenses=MIT",
+              "manifest-descriptor:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "manifest-descriptor:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.title=Hello-World",
+              "manifest-descriptor:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.version=dev"
+            ]
+          }
+        }
       }
     ],
     [
@@ -3857,6 +3978,30 @@ describe('bakeFile', () => {
             }
           }
         }
+      },
+      {
+        "target": {
+          "meta": {
+            "annotations": [
+              "index:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "index:org.opencontainers.image.description=This your first repo!",
+              "index:org.opencontainers.image.licenses=MIT",
+              "index:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "index:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.title=Hello-World",
+              "index:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.version=release1",
+              "manifest-descriptor:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "manifest-descriptor:org.opencontainers.image.description=This your first repo!",
+              "manifest-descriptor:org.opencontainers.image.licenses=MIT",
+              "manifest-descriptor:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "manifest-descriptor:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.title=Hello-World",
+              "manifest-descriptor:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.version=release1"
+            ]
+          }
+        }
       }
     ],
     [
@@ -3905,6 +4050,30 @@ describe('bakeFile', () => {
             }
           }
         }
+      },
+      {
+        "target": {
+          "docker-metadata-action": {
+            "annotations": [
+              "index:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "index:org.opencontainers.image.description=This your first repo!",
+              "index:org.opencontainers.image.licenses=MIT",
+              "index:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "index:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.title=Hello-World",
+              "index:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.version=20200110",
+              "manifest-descriptor:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "manifest-descriptor:org.opencontainers.image.description=This your first repo!",
+              "manifest-descriptor:org.opencontainers.image.licenses=MIT",
+              "manifest-descriptor:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "manifest-descriptor:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.title=Hello-World",
+              "manifest-descriptor:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.version=20200110"
+            ]
+          }
+        }
       }
     ],
     [
@@ -3962,6 +4131,30 @@ describe('bakeFile', () => {
             }
           }
         }
+      },
+      {
+        "target": {
+          "docker-metadata-action": {
+            "annotations": [
+              "index:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "index:org.opencontainers.image.description=This your first repo!",
+              "index:org.opencontainers.image.licenses=MIT",
+              "index:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "index:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.title=Hello-World",
+              "index:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.version=1.1.1",
+              "manifest-descriptor:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "manifest-descriptor:org.opencontainers.image.description=This your first repo!",
+              "manifest-descriptor:org.opencontainers.image.licenses=MIT",
+              "manifest-descriptor:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "manifest-descriptor:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.title=Hello-World",
+              "manifest-descriptor:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.version=1.1.1"
+            ]
+          }
+        }
       }
     ],
     [
@@ -4008,6 +4201,30 @@ describe('bakeFile', () => {
             }
           }
         }
+      },
+      {
+        "target": {
+          "docker-metadata-action": {
+            "annotations": [
+              "index:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "index:org.opencontainers.image.description=This your first repo!",
+              "index:org.opencontainers.image.licenses=MIT",
+              "index:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "index:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.title=Hello-World",
+              "index:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.version=my",
+              "manifest-descriptor:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "manifest-descriptor:org.opencontainers.image.description=This your first repo!",
+              "manifest-descriptor:org.opencontainers.image.licenses=MIT",
+              "manifest-descriptor:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "manifest-descriptor:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.title=Hello-World",
+              "manifest-descriptor:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.version=my"
+            ]
+          }
+        }
       }
     ],
     [
@@ -4053,9 +4270,37 @@ describe('bakeFile', () => {
             }
           }
         }
+      },
+      {
+        "target": {
+          "docker-metadata-action": {
+            "annotations": [
+              "index:maintainer=CrazyMax",
+              "index:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "index:org.opencontainers.image.description=Another description",
+              "index:org.opencontainers.image.licenses=MIT",
+              "index:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "index:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.title=MyCustom=Title",
+              "index:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "index:org.opencontainers.image.vendor=MyCompany",
+              "index:org.opencontainers.image.version=v1.1.1",
+              "manifest-descriptor:maintainer=CrazyMax",
+              "manifest-descriptor:org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+              "manifest-descriptor:org.opencontainers.image.description=Another description",
+              "manifest-descriptor:org.opencontainers.image.licenses=MIT",
+              "manifest-descriptor:org.opencontainers.image.revision=860c1904a1ce19322e91ac35af1ab07466440c37",
+              "manifest-descriptor:org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.title=MyCustom=Title",
+              "manifest-descriptor:org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+              "manifest-descriptor:org.opencontainers.image.vendor=MyCompany",
+              "manifest-descriptor:org.opencontainers.image.version=v1.1.1"
+            ]
+          }
+        }
       }
     ]
-  ])('given %p with %p event', async (name: string, envFile: string, inputs: Inputs, exBakeTags: unknown, exBakeLabels: unknown) => {
+  ])('given %p with %p event', async (name: string, envFile: string, inputs: Inputs, exBakeTags: unknown, exBakeLabels: unknown, exBakeAnnotations: unknown) => {
     process.env = dotenv.parse(fs.readFileSync(path.join(__dirname, 'fixtures', envFile)));
 
     const toolkit = new Toolkit();
@@ -4067,6 +4312,9 @@ describe('bakeFile', () => {
 
     const bakeFileLabels = meta.getBakeFile('labels');
     expect(JSON.parse(fs.readFileSync(bakeFileLabels, 'utf8'))).toEqual(exBakeLabels);
+
+    const bakeFileAnnotations = meta.getBakeFile('annotations:index,manifest-descriptor');
+    expect(JSON.parse(fs.readFileSync(bakeFileAnnotations, 'utf8'))).toEqual(exBakeAnnotations);
   });
 });
 

action.yml

@@ -44,12 +44,16 @@ outputs:
     description: 'Generated Docker tags'
   labels:
     description: 'Generated Docker labels'
+  annotations:
+    description: 'Generated annotations'
   json:
     description: 'JSON output of tags and labels'
   bake-file-tags:
     description: 'Bake definition file with tags'
   bake-file-labels:
     description: 'Bake definition file with labels'
+  bake-file-annotations:
+    description: 'Bake definiton file with annotations'
   bake-file:
     description: 'Bake definition file with tags and labels'
 

src/main.ts

@@ -74,19 +74,38 @@ actionsToolkit.run(
       setOutput('labels', labels.join(inputs.sepLabels));
     });
 
+    // Annotations
+    const alevels = process.env.DOCKER_METADATA_ANNOTATIONS_LEVELS || 'manifest';
+    if (labels.length > 0) {
+      await core.group(`Annotations`, async () => {
+        const annotations: Array<string> = [];
+        for (const level of alevels.split(',')) {
+          annotations.push(
+            ...labels.map(label => {
+              const v = `${level}:${label}`;
+              core.info(v);
+              return v;
+            })
+          );
+        }
+        setOutput(`annotations`, annotations.join(inputs.sepLabels));
+      });
+    }
+
     // JSON
-    const jsonOutput = meta.getJSON();
+    const jsonOutput = meta.getJSON(alevels.split(','));
     await core.group(`JSON output`, async () => {
       core.info(JSON.stringify(jsonOutput, null, 2));
       setOutput('json', JSON.stringify(jsonOutput));
     });
 
     // Bake files
-    for (const kind of ['tags', 'labels']) {
+    for (const kind of ['tags', 'labels', 'annotations:' + alevels]) {
+      const outputName = kind.split(':')[0];
       const bakeFile: string = meta.getBakeFile(kind);
-      await core.group(`Bake file definition (${kind})`, async () => {
+      await core.group(`Bake file definition (${outputName})`, async () => {
         core.info(fs.readFileSync(bakeFile, 'utf8'));
-        setOutput(`bake-file-${kind}`, bakeFile);
+        setOutput(`bake-file-${outputName}`, bakeFile);
       });
     }
 

src/meta.ts

@@ -480,7 +480,11 @@ export class Meta {
       .map(([key, value]) => `${key}=${value}`);
   }
 
-  public getJSON(): unknown {
+  public getJSON(alevels: string[]): unknown {
+    const annotations: Array<string> = [];
+    for (const level of alevels) {
+      annotations.push(...this.getLabels().map(label => `${level}:${label}`));
+    }
     return {
       tags: this.getTags(),
       labels: this.getLabels().reduce((res, label) => {
@@ -490,34 +494,42 @@ export class Meta {
         }
         res[matches[1]] = matches[2];
         return res;
-      }, {})
+      }, {}),
+      annotations: annotations
     };
   }
 
   public getBakeFile(kind: string): string {
-    switch (kind) {
+    if (kind == 'tags') {
-      case 'tags':
+      return this.generateBakeFile(kind, {
-        return this.generateBakeFile(kind, {
+        tags: this.getTags(),
-          tags: this.getTags(),
+        args: {
-          args: {
+          DOCKER_META_IMAGES: this.getImageNames().join(','),
-            DOCKER_META_IMAGES: this.getImageNames().join(','),
+          DOCKER_META_VERSION: this.version.main
-            DOCKER_META_VERSION: this.version.main
+        }
-          }
+      });
-        });
+    } else if (kind == 'labels') {
-      case 'labels':
+      return this.generateBakeFile(kind, {
-        return this.generateBakeFile(kind, {
+        labels: this.getLabels().reduce((res, label) => {
-          labels: this.getLabels().reduce((res, label) => {
+          const matches = label.match(/([^=]*)=(.*)/);
-            const matches = label.match(/([^=]*)=(.*)/);
+          if (!matches) {
-            if (!matches) {
-              return res;
-            }
-            res[matches[1]] = matches[2];
             return res;
-          }, {})
+          }
-        });
+          res[matches[1]] = matches[2];
-      default:
+          return res;
-        throw new Error(`Unknown bake file type: ${kind}`);
+        }, {})
+      });
+    } else if (kind.startsWith('annotations:')) {
+      const name = kind.split(':')[0];
+      const annotations: Array<string> = [];
+      for (const level of kind.split(':')[1].split(',')) {
+        annotations.push(...this.getLabels().map(label => `${level}:${label}`));
+      }
+      return this.generateBakeFile(name, {
+        annotations: annotations
+      });
     }
+    throw new Error(`Unknown bake file type: ${kind}`);
   }
 
   public getBakeFileTagsLabels(): string {