fix: resolve eStargz version check bug and add test coverage

- Move buildx version check before adding compression parameters to prevent build failures on older buildx versions
- Add comprehensive unit tests for estargz feature with 8 test cases
- Simplify redundant ternary operator logic
- Rebuild dist files to fix CI verification

Fixes the critical bug where compression parameters were added before version validation, causing unsupported parameter errors on buildx < 0.10.0

src/__tests__/estargz.test.ts

@@ -0,0 +1,189 @@
+import * as core from '@actions/core';
+import {getArgs, Inputs} from '../context';
+import {Toolkit} from '@docker/actions-toolkit/lib/toolkit';
+
+jest.mock('@actions/core');
+
+// Mock the Toolkit.
+jest.mock('@docker/actions-toolkit/lib/toolkit');
+
+describe('eStargz compression', () => {
+  let mockToolkit: jest.Mocked<Toolkit>;
+  let baseInputs: Inputs;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+
+    // Create a mock toolkit with all necessary methods.
+    mockToolkit = {
+      buildx: {
+        versionSatisfies: jest.fn(),
+        getCommand: jest.fn(),
+        printVersion: jest.fn(),
+        isAvailable: jest.fn()
+      },
+      buildxBuild: {
+        getImageIDFilePath: jest.fn().mockReturnValue('/tmp/iidfile'),
+        getMetadataFilePath: jest.fn().mockReturnValue('/tmp/metadata'),
+        resolveImageID: jest.fn(),
+        resolveMetadata: jest.fn(),
+        resolveDigest: jest.fn(),
+        resolveWarnings: jest.fn(),
+        resolveRef: jest.fn()
+      },
+      builder: {
+        inspect: jest.fn().mockResolvedValue({
+          name: 'default',
+          driver: 'docker-container',
+          nodes: []
+        })
+      },
+      buildkit: {
+        versionSatisfies: jest.fn().mockResolvedValue(false)
+      }
+    } as any;
+
+    // Base inputs for testing.
+    baseInputs = {
+      'add-hosts': [],
+      allow: [],
+      annotations: [],
+      attests: [],
+      'build-args': [],
+      'build-contexts': [],
+      builder: '',
+      'cache-from': [],
+      'cache-to': [],
+      'cgroup-parent': '',
+      context: '.',
+      file: '',
+      labels: [],
+      load: false,
+      network: '',
+      'no-cache': false,
+      'no-cache-filters': [],
+      outputs: [],
+      platforms: [],
+      provenance: '',
+      pull: false,
+      push: false,
+      sbom: '',
+      secrets: [],
+      'secret-envs': [],
+      'secret-files': [],
+      'shm-size': '',
+      ssh: [],
+      tags: ['user/app:latest'],
+      target: '',
+      ulimit: [],
+      'github-token': '',
+      estargz: false
+    };
+  });
+
+  test('should not add estargz parameters when estargz is false', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockResolvedValue(true);
+
+    const inputs = {...baseInputs, push: true, estargz: false};
+    const args = await getArgs(inputs, mockToolkit);
+
+    expect(args.join(' ')).not.toContain('compression=estargz');
+  });
+
+  test('should not add estargz parameters when push is false', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockResolvedValue(true);
+
+    const inputs = {...baseInputs, push: false, estargz: true};
+    const args = await getArgs(inputs, mockToolkit);
+
+    expect(args.join(' ')).not.toContain('compression=estargz');
+    expect(core.warning).toHaveBeenCalledWith("eStargz compression requires push: true; the input 'estargz' is ignored.");
+  });
+
+  test('should not add estargz parameters when buildx version is < 0.10.0', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockImplementation(async (version: string) => {
+      return version === '>=0.6.0'; // Only 0.6.0 check passes, not 0.10.0.
+    });
+
+    const inputs = {...baseInputs, push: true, estargz: true};
+    const args = await getArgs(inputs, mockToolkit);
+
+    expect(args.join(' ')).not.toContain('compression=estargz');
+    expect(core.warning).toHaveBeenCalledWith("eStargz compression requires buildx >= 0.10.0; the input 'estargz' is ignored.");
+  });
+
+  test('should add estargz output when estargz is true, push is true, and buildx >= 0.10.0', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockResolvedValue(true);
+
+    const inputs = {...baseInputs, push: true, estargz: true};
+    const args = await getArgs(inputs, mockToolkit);
+
+    expect(args).toContain('--output');
+    const outputIndex = args.indexOf('--output');
+    expect(args[outputIndex + 1]).toBe('type=registry,compression=estargz,force-compression=true,oci-mediatypes=true');
+  });
+
+  test('should modify existing registry output with estargz parameters', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockResolvedValue(true);
+
+    const inputs = {
+      ...baseInputs,
+      push: true,
+      estargz: true,
+      outputs: ['type=registry,dest=output.txt']
+    };
+    const args = await getArgs(inputs, mockToolkit);
+
+    expect(args).toContain('--output');
+    const outputIndex = args.indexOf('--output');
+    expect(args[outputIndex + 1]).toBe('type=registry,dest=output.txt,compression=estargz,force-compression=true,oci-mediatypes=true');
+  });
+
+  test('should not modify non-registry outputs with estargz parameters', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockResolvedValue(true);
+
+    const inputs = {
+      ...baseInputs,
+      push: true,
+      estargz: true,
+      outputs: ['type=docker']
+    };
+    const args = await getArgs(inputs, mockToolkit);
+
+    expect(args).toContain('--output');
+    const outputIndex = args.indexOf('--output');
+    expect(args[outputIndex + 1]).toBe('type=docker');
+  });
+
+  test('should handle multiple outputs correctly', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockResolvedValue(true);
+
+    const inputs = {
+      ...baseInputs,
+      push: true,
+      estargz: true,
+      outputs: ['type=registry', 'type=docker']
+    };
+    const args = await getArgs(inputs, mockToolkit);
+
+    const argsStr = args.join(' ');
+    expect(argsStr).toContain('type=registry,compression=estargz,force-compression=true,oci-mediatypes=true');
+    expect(argsStr).toContain('type=docker');
+  });
+
+  test('should work with existing registry output without additional params', async () => {
+    (mockToolkit.buildx.versionSatisfies as jest.Mock).mockResolvedValue(true);
+
+    const inputs = {
+      ...baseInputs,
+      push: true,
+      estargz: true,
+      outputs: ['type=registry']
+    };
+    const args = await getArgs(inputs, mockToolkit);
+
+    expect(args).toContain('--output');
+    const outputIndex = args.indexOf('--output');
+    expect(args[outputIndex + 1]).toBe('type=registry,compression=estargz,force-compression=true,oci-mediatypes=true');
+  });
+});

src/context.ts

@@ -209,27 +209,10 @@ async function getBuildArgs(inputs: Inputs, context: string, toolkit: Toolkit):
   await Util.asyncForEach(inputs['no-cache-filters'], async noCacheFilter => {
     args.push('--no-cache-filter', noCacheFilter);
   });
-  await Util.asyncForEach(inputs.outputs, async output => {
-    if (inputs.estargz && inputs.push) {
-      if (output.startsWith('type=registry') || output === 'type=registry') {
-        const estargzOutput = output.includes(',') 
-          ? `${output},compression=estargz,force-compression=true,oci-mediatypes=true`
-          : `${output},compression=estargz,force-compression=true,oci-mediatypes=true`;
-        args.push('--output', estargzOutput);
-      } else {
-        args.push('--output', output);
-      }
-    } else {
-      args.push('--output', output);
-    }
-  });
-  
-  if (inputs.estargz && inputs.push && inputs.outputs.length === 0) {
-    args.push('--output', 'type=registry,compression=estargz,force-compression=true,oci-mediatypes=true');
-  }
-  if (inputs.platforms.length > 0) {
-    args.push('--platform', inputs.platforms.join(','));
-  }
+
+  // Check estargz requirements BEFORE modifying outputs.
+  const useEstargz = inputs.estargz && inputs.push && (await toolkit.buildx.versionSatisfies('>=0.10.0'));
+
   if (inputs.estargz) {
     if (!(await toolkit.buildx.versionSatisfies('>=0.10.0'))) {
       core.warning("eStargz compression requires buildx >= 0.10.0; the input 'estargz' is ignored.");
@@ -237,6 +220,22 @@ async function getBuildArgs(inputs: Inputs, context: string, toolkit: Toolkit):
       core.warning("eStargz compression requires push: true; the input 'estargz' is ignored.");
     }
   }
+
+  await Util.asyncForEach(inputs.outputs, async output => {
+    if (useEstargz && (output.startsWith('type=registry') || output === 'type=registry')) {
+      const estargzOutput = `${output},compression=estargz,force-compression=true,oci-mediatypes=true`;
+      args.push('--output', estargzOutput);
+    } else {
+      args.push('--output', output);
+    }
+  });
+
+  if (useEstargz && inputs.outputs.length === 0) {
+    args.push('--output', 'type=registry,compression=estargz,force-compression=true,oci-mediatypes=true');
+  }
+  if (inputs.platforms.length > 0) {
+    args.push('--platform', inputs.platforms.join(','));
+  }
   if (await toolkit.buildx.versionSatisfies('>=0.10.0')) {
     args.push(...(await getAttestArgs(inputs, toolkit)));
   } else {