labelPrefix flavor for annotations support

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

README.md

@@ -47,6 +47,7 @@ ___
     * [`{{date '<format>' tz='<timezone>'}}`](#date-format-tztimezone)
   * [Major version zero](#major-version-zero)
   * [JSON output object](#json-output-object)
+  * [Labels prefix](#labels-prefix)
   * [Overwrite labels](#overwrite-labels)
 * [Contributing](#contributing)
 
@@ -368,6 +369,7 @@ flavor: |
   latest=auto
   prefix=
   suffix=
+  labelPrefix=
 ```
 
 * `latest=<auto|true|false>`: Handle [latest tag](#latest-tag) (default `auto`)
@@ -375,6 +377,8 @@ flavor: |
   tag and optionally for `latest`
 * `suffix=<string>,onlatest=<true|false>`: A global suffix for each generated
   tag and optionally for `latest`
+* `labelPrefix=<string>`: A global prefix to apply to each label. Can be  
+  useful to [set annotations at manifest or index level](#labels-prefix).
 
 ## `tags` input
 
@@ -867,6 +871,31 @@ that you can reuse them further in your workflow using the [`fromJSON` function]
             REVISION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}
 ```
 
+### Labels prefix
+
+Since Buildx 0.12, it is possible to set annotations to your image through the
+`--annotation` flag. When using the metadata-action you can set the `manifest:`
+or `index:` prefix to each label using the `labelPrefix` attribute in the
+`flavor` input. When used with the [`build-push-action`](https://github.com/docker/build-push-action/)
+and the `annotations` input, it will either set annotations at the manifest or
+index level:
+
+```yaml
+      -
+        name: Docker meta
+        uses: docker/metadata-action@v5
+        with:
+          images: name/app
+          flavor: |
+            labelPrefix=index:
+      -
+        name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          tags: ${{ steps.meta.outputs.tags }}
+          annotations: ${{ steps.meta.outputs.labels }}
+```
+
 ### Overwrite labels
 
 If some [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)

__tests__/flavor.test.ts

@@ -37,6 +37,7 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "",
         suffixLatest: false,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -50,6 +51,7 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "",
         suffixLatest: false,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -63,6 +65,7 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "",
         suffixLatest: false,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -83,6 +86,7 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "",
         suffixLatest: false,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -96,6 +100,7 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "-alpine",
         suffixLatest: false,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -111,6 +116,7 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "-alpine",
         suffixLatest: false,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -124,6 +130,7 @@ describe('transform', () => {
         prefixLatest: true,
         suffix: "",
         suffixLatest: false,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -137,6 +144,7 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "-alpine",
         suffixLatest: true,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -151,6 +159,7 @@ describe('transform', () => {
         prefixLatest: true,
         suffix: "-alpine",
         suffixLatest: true,
+        labelPrefix: "",
       } as Flavor,
       false
     ],
@@ -164,6 +173,21 @@ describe('transform', () => {
         prefixLatest: false,
         suffix: "",
         suffixLatest: false,
+        labelPrefix: "",
+      } as Flavor,
+      false
+    ],
+    [
+      [
+        `labelPrefix=manifest:`,
+      ],
+      {
+        latest: "auto",
+        prefix: "",
+        prefixLatest: false,
+        suffix: "",
+        suffixLatest: false,
+        labelPrefix: "manifest:",
       } as Flavor,
       false
     ]

__tests__/meta.test.ts

@@ -3463,6 +3463,37 @@ describe('raw', () => {
         "org.opencontainers.image.version=foo"
       ]
     ],
+    [
+      'raw11',
+      'event_push_dev.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=raw,foo`
+        ],
+        flavor: [
+          `labelPrefix=index:`,
+        ]
+      } as Inputs,
+      {
+        main: 'foo',
+        partial: [],
+        latest: false
+      } as Version,
+      [
+        'user/app:foo'
+      ],
+      [
+        "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=foo"
+      ]
+    ]
   ])('given %p wth %p event', tagsLabelsTest);
 });
 
@@ -3706,7 +3737,35 @@ describe('json', () => {
           "org.opencontainers.image.version": "v1.1.1"
         }
       }
-    ]
+    ],
+    [
+      'json08',
+      'event_push_dev.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=raw,foo`
+        ],
+        flavor: [
+          "labelPrefix=manifest:",
+        ]
+      } as Inputs,
+      {
+        "tags": [
+          "user/app:foo"
+        ],
+        "labels": {
+          "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": "foo"
+        }
+      }
+    ],
   ])('given %p with %p event', async (name: string, envFile: string, inputs: Inputs, exJSON: unknown) => {
     process.env = dotenv.parse(fs.readFileSync(path.join(__dirname, 'fixtures', envFile)));
 
@@ -4012,6 +4071,42 @@ describe('bake', () => {
           }
         }
       }
+    ],
+    [
+      'bake08',
+      'event_push_dev.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=raw,foo`
+        ],
+        flavor: [
+          "labelPrefix=index:",
+        ]
+      } as Inputs,
+      {
+        "target": {
+          "docker-metadata-action": {
+            "tags": [
+              "user/app:foo"
+            ],
+            "labels": {
+              "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": "foo"
+            },
+            "args": {
+              "DOCKER_META_IMAGES": "user/app",
+              "DOCKER_META_VERSION": "foo",
+            }
+          }
+        }
+      }
     ]
   ])('given %p with %p event', async (name: string, envFile: string, inputs: Inputs, exBakeDefinition: unknown) => {
     process.env = dotenv.parse(fs.readFileSync(path.join(__dirname, 'fixtures', envFile)));

src/flavor.ts

@@ -7,6 +7,7 @@ export interface Flavor {
   prefixLatest: boolean;
   suffix: string;
   suffixLatest: boolean;
+  labelPrefix: string;
 }
 
 export function Transform(inputs: string[]): Flavor {
@@ -15,7 +16,8 @@ export function Transform(inputs: string[]): Flavor {
     prefix: '',
     prefixLatest: false,
     suffix: '',
-    suffixLatest: false
+    suffixLatest: false,
+    labelPrefix: ''
   };
 
   for (const input of inputs) {
@@ -68,6 +70,10 @@ export function Transform(inputs: string[]): Flavor {
           }
           break;
         }
+        case 'labelprefix': {
+          flavor.labelPrefix = value;
+          break;
+        }
         default: {
           throw new Error(`Unknown flavor entry: ${input}`);
         }
@@ -81,6 +87,7 @@ export function Transform(inputs: string[]): Flavor {
   core.info(`prefixLatest=${flavor.prefixLatest}`);
   core.info(`suffix=${flavor.suffix}`);
   core.info(`suffixLatest=${flavor.suffixLatest}`);
+  core.info(`labelPrefix=${flavor.labelPrefix}`);
   core.endGroup();
 
   return flavor;

src/meta.ts

@@ -455,7 +455,7 @@ export class Meta {
   }
 
   public getLabels(): Array<string> {
-    const labels: Array<string> = [
+    let labels: Array<string> = [
       `org.opencontainers.image.title=${this.repo.name || ''}`,
       `org.opencontainers.image.description=${this.repo.description || ''}`,
       `org.opencontainers.image.url=${this.repo.html_url || ''}`,
@@ -466,6 +466,9 @@ export class Meta {
       `org.opencontainers.image.licenses=${this.repo.license?.spdx_id || ''}`
     ];
     labels.push(...this.inputs.labels);
+    if (this.flavor.labelPrefix.length > 0) {
+      labels = labels.map(label => this.flavor.labelPrefix + label);
+    }
 
     return Array.from(
       new Map<string, string>(