handle no default attestations env var

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

.github/workflows/ci.yml

@@ -734,3 +734,19 @@ jobs:
             ./test/config.hcl
           allow: network.host
           targets: app-entitlements
+
+  no-default-attestations:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Build
+        uses: ./
+        with:
+          source: .
+          files: |
+            ./test/config.hcl
+        env:
+          BUILDX_NO_DEFAULT_ATTESTATIONS: 1

__tests__/context.test.ts

@@ -1,4 +1,4 @@
-import {beforeEach, describe, expect, jest, test} from '@jest/globals';
+import {afterEach, beforeEach, describe, expect, jest, test} from '@jest/globals';
 import * as fs from 'fs';
 import * as path from 'path';
 
@@ -122,6 +122,7 @@ jest.spyOn(Bake.prototype, 'getDefinition').mockImplementation(async (): Promise
 });
 
 describe('getArgs', () => {
+  const originalEnv = process.env;
   beforeEach(() => {
     process.env = Object.keys(process.env).reduce((object, key) => {
       if (!key.startsWith('INPUT_')) {
@@ -130,6 +131,9 @@ describe('getArgs', () => {
       return object;
     }, {});
   });
+  afterEach(() => {
+    process.env = originalEnv;
+  });
 
   // prettier-ignore
   test.each([
@@ -145,7 +149,8 @@ describe('getArgs', () => {
       ]),
       [
         'bake',
-      ]
+      ],
+      undefined
     ],
     [
       1,
@@ -160,7 +165,8 @@ describe('getArgs', () => {
       [
         'bake',
         '--metadata-file', metadataJson
-      ]
+      ],
+      undefined
     ],
     [
       2,
@@ -177,7 +183,8 @@ describe('getArgs', () => {
         'bake',
         '--metadata-file', metadataJson,
         'webapp', 'validate'
-      ]
+      ],
+      undefined
     ],
     [
       3,
@@ -195,7 +202,8 @@ describe('getArgs', () => {
         '--set', '*.cache-from=type=gha',
         '--set', '*.cache-to=type=gha',
         '--metadata-file', metadataJson
-      ]
+      ],
+      undefined
     ],
     [
       4,
@@ -211,7 +219,8 @@ describe('getArgs', () => {
         'bake',
         '--metadata-file', metadataJson,
         "--provenance", `mode=min,inline-only=true,builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`,
-      ]
+      ],
+      undefined
     ],
     [
       5,
@@ -228,7 +237,8 @@ describe('getArgs', () => {
         'bake',
         '--metadata-file', metadataJson,
         "--provenance", `builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`
-      ]
+      ],
+      undefined
     ],
     [
       6,
@@ -245,7 +255,8 @@ describe('getArgs', () => {
         'bake',
         '--metadata-file', metadataJson,
         "--provenance", `mode=max,builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`
-      ]
+      ],
+      undefined
     ],
     [
       7,
@@ -262,7 +273,8 @@ describe('getArgs', () => {
         'bake',
         '--metadata-file', metadataJson,
         "--provenance", 'false'
-      ]
+      ],
+      undefined
     ],
     [
       8,
@@ -279,7 +291,8 @@ describe('getArgs', () => {
         'bake',
         '--metadata-file', metadataJson,
         "--provenance", 'builder-id=foo'
-      ]
+      ],
+      undefined
     ],
     [
       9,
@@ -300,7 +313,8 @@ describe('getArgs', () => {
         '--metadata-file', metadataJson,
         '--provenance', `mode=min,inline-only=true,builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`,
         'image-all'
-      ]
+      ],
+      undefined
     ],
     [
       10,
@@ -320,7 +334,8 @@ describe('getArgs', () => {
         '--metadata-file', metadataJson,
         '--provenance', `mode=min,inline-only=true,builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`,
         'image-all'
-      ]
+      ],
+      undefined
     ],
     [
       11,
@@ -338,7 +353,8 @@ describe('getArgs', () => {
         '--file', './foo.hcl',
         '--metadata-file', metadataJson,
         '--provenance', `mode=min,inline-only=true,builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`,
-      ]
+      ],
+      undefined
     ],
     [
       12,
@@ -356,7 +372,8 @@ describe('getArgs', () => {
         '--allow', 'network.host',
         '--metadata-file', metadataJson,
         "--provenance", `mode=min,inline-only=true,builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`
-      ]
+      ],
+      undefined
     ],
     [
       13,
@@ -375,11 +392,35 @@ describe('getArgs', () => {
         '--file', './foo.hcl',
         '--metadata-file', metadataJson,
         '--provenance', `mode=min,inline-only=true,builder-id=https://github.com/docker/build-push-action/actions/runs/123456789/attempts/1`,
-      ]
+      ],
+      undefined
+    ],
+    [
+      14,
+      '0.15.0',
+      new Map<string, string>([
+        ['source', '.'],
+        ['load', 'false'],
+        ['no-cache', 'false'],
+        ['push', 'false'],
+        ['pull', 'false']
+      ]),
+      [
+        'bake',
+        '--metadata-file', metadataJson
+      ],
+      new Map<string, string>([
+        ['BUILDX_NO_DEFAULT_ATTESTATIONS', '1']
+      ])
     ],
   ])(
     '[%d] given %p with %p as inputs, returns %p',
-    async (num: number, buildxVersion: string, inputs: Map<string, string>, expected: Array<string>) => {
+    async (num: number, buildxVersion: string, inputs: Map<string, string>, expected: Array<string>, envs: Map<string, string> | undefined) => {
+      if (envs) {
+        envs.forEach((value: string, name: string) => {
+          process.env[name] = value;
+        });
+      }
       inputs.forEach((value: string, name: string) => {
         setInput(name, value);
       });

src/context.ts

@@ -103,7 +103,7 @@ async function getBakeArgs(inputs: Inputs, definition: BakeDefinition, toolkit:
   if (await toolkit.buildx.versionSatisfies('>=0.10.0')) {
     if (inputs.provenance) {
       args.push('--provenance', inputs.provenance);
-    } else if ((await toolkit.buildkit.versionSatisfies(inputs.builder, '>=0.11.0')) && !Bake.hasDockerExporter(definition, inputs.load)) {
+    } else if (!noDefaultAttestations() && (await toolkit.buildkit.versionSatisfies(inputs.builder, '>=0.11.0')) && !Bake.hasDockerExporter(definition, inputs.load)) {
       // if provenance not specified and BuildKit version compatible for
       // attestation, set default provenance. Also needs to make sure user
       // doesn't want to explicitly load the image to docker.
@@ -155,3 +155,10 @@ function getSourceInput(name: string): string {
   }
   return source;
 }
+
+function noDefaultAttestations(): boolean {
+  if (process.env.BUILDX_NO_DEFAULT_ATTESTATIONS) {
+    return Util.parseBool(process.env.BUILDX_NO_DEFAULT_ATTESTATIONS);
+  }
+  return false;
+}