check BuildKit compatibility before setting default provenance opts

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

.github/workflows/ci.yml

@@ -491,7 +491,39 @@ jobs:
           cache-from: type=gha,scope=nocachefilter
           cache-to: type=gha,scope=nocachefilter,mode=max
 
-  attests:
+  attests-compat:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - buildx: latest
+            buildkit: moby/buildkit:buildx-stable-1
+          - buildx: latest
+            buildkit: moby/buildkit:v0.10.6
+          - buildx: v0.9.1
+            buildkit: moby/buildkit:buildx-stable-1
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: ${{ matrix.buildx }}
+          driver-opts: |
+            network=host
+            image=${{ matrix.buildkit }}
+      -
+        name: Build
+        uses: ./
+        with:
+          context: ./test/go
+          file: ./test/go/Dockerfile
+          outputs: type=cacheonly
+
+  sbom:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -506,9 +538,6 @@ jobs:
         image: registry:2
         ports:
           - 5000:5000
-    env:
-      BUILDX_VERSION: v0.10.0-rc2  # TODO: remove when Buildx v0.10.0 is released
-      BUILDKIT_IMAGE: moby/buildkit:v0.11.0-rc3  # TODO: remove when BuildKit v0.11.0 is released
     steps:
       -
         name: Checkout

src/buildx.ts

@@ -3,9 +3,24 @@ import fs from 'fs';
 import path from 'path';
 import * as semver from 'semver';
 import * as exec from '@actions/exec';
-
 import * as context from './context';
 
+export type Builder = {
+  name?: string;
+  driver?: string;
+  nodes: Node[];
+};
+
+export type Node = {
+  name?: string;
+  endpoint?: string;
+  'driver-opts'?: Array<string>;
+  status?: string;
+  'buildkitd-flags'?: string;
+  buildkit?: string;
+  platforms?: string;
+};
+
 export async function getImageIDFile(): Promise<string> {
   return path.join(context.tmpDir(), 'iidfile').split(path.sep).join(path.posix.sep);
 }
@@ -126,6 +141,112 @@ export async function isAvailable(standalone?: boolean): Promise<boolean> {
     });
 }
 
+export async function satisfiesBuildKitVersion(builderName: string, range: string, standalone?: boolean): Promise<boolean> {
+  const builderInspect = await inspect(builderName, standalone);
+  for (const node of builderInspect.nodes) {
+    if (!node.buildkit) {
+      return false;
+    }
+    // BuildKit version reported by moby is in the format of `v0.11.0-moby`
+    if (builderInspect.driver == 'docker' && !node.buildkit.endsWith('-moby')) {
+      return false;
+    }
+    const version = node.buildkit.replace(/-moby$/, '');
+    if (!semver.satisfies(version, range)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+async function inspect(name: string, standalone?: boolean): Promise<Builder> {
+  const cmd = getCommand(['inspect', name], standalone);
+  return await exec
+    .getExecOutput(cmd.command, cmd.args, {
+      ignoreReturnCode: true,
+      silent: true
+    })
+    .then(res => {
+      if (res.stderr.length > 0 && res.exitCode != 0) {
+        throw new Error(res.stderr.trim());
+      }
+      return parseInspect(res.stdout);
+    });
+}
+
+async function parseInspect(data: string): Promise<Builder> {
+  const builder: Builder = {
+    nodes: []
+  };
+  let node: Node = {};
+  for (const line of data.trim().split(`\n`)) {
+    const [key, ...rest] = line.split(':');
+    const value = rest.map(v => v.trim()).join(':');
+    if (key.length == 0 || value.length == 0) {
+      continue;
+    }
+    switch (key.toLowerCase()) {
+      case 'name': {
+        if (builder.name == undefined) {
+          builder.name = value;
+        } else {
+          if (Object.keys(node).length > 0) {
+            builder.nodes.push(node);
+            node = {};
+          }
+          node.name = value;
+        }
+        break;
+      }
+      case 'driver': {
+        builder.driver = value;
+        break;
+      }
+      case 'endpoint': {
+        node.endpoint = value;
+        break;
+      }
+      case 'driver options': {
+        node['driver-opts'] = (value.match(/(\w+)="([^"]*)"/g) || []).map(v => v.replace(/^(.*)="(.*)"$/g, '$1=$2'));
+        break;
+      }
+      case 'status': {
+        node.status = value;
+        break;
+      }
+      case 'flags': {
+        node['buildkitd-flags'] = value;
+        break;
+      }
+      case 'buildkit': {
+        node.buildkit = value;
+        break;
+      }
+      case 'platforms': {
+        let platforms: Array<string> = [];
+        // if a preferred platform is being set then use only these
+        // https://docs.docker.com/engine/reference/commandline/buildx_inspect/#get-information-about-a-builder-instance
+        if (value.includes('*')) {
+          for (const platform of value.split(', ')) {
+            if (platform.includes('*')) {
+              platforms.push(platform.replace('*', ''));
+            }
+          }
+        } else {
+          // otherwise set all platforms available
+          platforms = value.split(', ');
+        }
+        node.platforms = platforms.join(',');
+        break;
+      }
+    }
+  }
+  if (Object.keys(node).length > 0) {
+    builder.nodes.push(node);
+  }
+  return builder;
+}
+
 export async function getVersion(standalone?: boolean): Promise<string> {
   const cmd = getCommand(['version'], standalone);
   return await exec

src/context.ts

@@ -103,17 +103,17 @@ export async function getInputs(defaultContext: string): Promise<Inputs> {
   };
 }
 
-export async function getArgs(inputs: Inputs, defaultContext: string, buildxVersion: string): Promise<Array<string>> {
+export async function getArgs(inputs: Inputs, defaultContext: string, buildxVersion: string, standalone?: boolean): Promise<Array<string>> {
   const context = handlebars.compile(inputs.context)({defaultContext});
   // prettier-ignore
   return [
-    ...await getBuildArgs(inputs, defaultContext, context, buildxVersion),
+    ...await getBuildArgs(inputs, defaultContext, context, buildxVersion, standalone),
     ...await getCommonArgs(inputs, buildxVersion),
     context
   ];
 }
 
-async function getBuildArgs(inputs: Inputs, defaultContext: string, context: string, buildxVersion: string): Promise<Array<string>> {
+async function getBuildArgs(inputs: Inputs, defaultContext: string, context: string, buildxVersion: string, standalone?: boolean): Promise<Array<string>> {
   const args: Array<string> = ['build'];
   await asyncForEach(inputs.addHosts, async addHost => {
     args.push('--add-host', addHost);
@@ -164,10 +164,12 @@ async function getBuildArgs(inputs: Inputs, defaultContext: string, context: str
   if (buildx.satisfies(buildxVersion, '>=0.10.0')) {
     if (inputs.provenance) {
       args.push('--provenance', inputs.provenance);
-    } else if (fromPayload('repository.private') !== false) {
-      args.push('--provenance', `mode=min,inline-only=true`);
-    } else {
-      args.push('--provenance', `mode=max,builder-id=${process.env.GITHUB_SERVER_URL || 'https://github.com'}/${github.context.repo.owner}/${github.context.repo.repo}/actions/runs/${github.context.runId}`);
+    } else if (await buildx.satisfiesBuildKitVersion(inputs.builder, '>=0.11.0', standalone)) {
+      if (fromPayload('repository.private') !== false) {
+        args.push('--provenance', `mode=min,inline-only=true`);
+      } else {
+        args.push('--provenance', `mode=max,builder-id=${process.env.GITHUB_SERVER_URL || 'https://github.com'}/${github.context.repo.owner}/${github.context.repo.repo}/actions/runs/${github.context.runId}`);
+      }
     }
     if (inputs.sbom) {
       args.push('--sbom', inputs.sbom);

src/main.ts

@@ -41,7 +41,7 @@ async function run(): Promise<void> {
       });
     });
 
-    const args: string[] = await context.getArgs(inputs, defContext, buildxVersion);
+    const args: string[] = await context.getArgs(inputs, defContext, buildxVersion, standalone);
     const buildCmd = buildx.getCommand(args, standalone);
     await exec
       .getExecOutput(buildCmd.command, buildCmd.args, {