feat: add linux64RemoveExecutableExtension parameter (default: false)

Adds configurable control over the `.x86_64` file extension for
StandaloneLinux64 builds. Default is `false` (keep the extension),
matching Unity's native behavior.

Set `linux64RemoveExecutableExtension: true` to restore the
extensionless behavior from v4.

Rebased from kitlith's original PR #726. Default flipped for v5.

Closes #722

Co-Authored-By: kitlith <kitlith@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

action.yml

@@ -178,6 +178,11 @@ inputs:
     default: 'false'
     required: false
     description: 'Skip the activation/deactivation of Unity. This assumes Unity is already activated.'
+  linux64RemoveExecutableExtension:
+    default: 'false'
+    required: false
+    description:
+      'When building for StandaloneLinux64, remove the default file extension of `.x86_64`. Set to true to restore the extensionless behavior from v4.'
 
 outputs:
   volume:

src/model/build-parameters.test.ts

@@ -117,18 +117,21 @@ describe('BuildParameters', () => {
     });
 
     test.each`
-      targetPlatform                        | expectedExtension | androidExportType
-      ${Platform.types.Android}             | ${'.apk'}         | ${'androidPackage'}
-      ${Platform.types.Android}             | ${'.aab'}         | ${'androidAppBundle'}
-      ${Platform.types.Android}             | ${''}             | ${'androidStudioProject'}
-      ${Platform.types.StandaloneWindows}   | ${'.exe'}         | ${'n/a'}
-      ${Platform.types.StandaloneWindows64} | ${'.exe'}         | ${'n/a'}
+      targetPlatform                        | expectedExtension | androidExportType         | linux64RemoveExecutableExtension
+      ${Platform.types.Android}             | ${'.apk'}         | ${'androidPackage'}       | ${false}
+      ${Platform.types.Android}             | ${'.aab'}         | ${'androidAppBundle'}     | ${true}
+      ${Platform.types.Android}             | ${''}             | ${'androidStudioProject'} | ${false}
+      ${Platform.types.StandaloneWindows}   | ${'.exe'}         | ${'n/a'}                  | ${true}
+      ${Platform.types.StandaloneWindows64} | ${'.exe'}         | ${'n/a'}                  | ${false}
+      ${Platform.types.StandaloneLinux64}   | ${'.x86_64'}      | ${'n/a'}                  | ${false}
+      ${Platform.types.StandaloneLinux64}   | ${''}             | ${'n/a'}                  | ${true}
     `(
-      'appends $expectedExtension for $targetPlatform with androidExportType $androidExportType',
-      async ({ targetPlatform, expectedExtension, androidExportType }) => {
+      'appends $expectedExtension for $targetPlatform with linux64RemoveExecutableExtension=$linux64RemoveExecutableExtension',
+      async ({ targetPlatform, expectedExtension, androidExportType, linux64RemoveExecutableExtension }) => {
         vi.spyOn(Input, 'targetPlatform', 'get').mockReturnValue(targetPlatform);
         vi.spyOn(Input, 'buildName', 'get').mockReturnValue(targetPlatform);
         vi.spyOn(Input, 'androidExportType', 'get').mockReturnValue(androidExportType);
+        vi.spyOn(Input, 'linux64RemoveExecutableExtension', 'get').mockReturnValue(linux64RemoveExecutableExtension);
         await expect(BuildParameters.create()).resolves.toEqual(
           expect.objectContaining({ buildFile: `${targetPlatform}${expectedExtension}` }),
         );

src/model/build-parameters.ts

@@ -73,6 +73,7 @@ class BuildParameters {
       Input.buildName,
       Input.targetPlatform,
       Input.androidExportType,
+      Input.linux64RemoveExecutableExtension,
     );
     const editorVersion = UnityVersioning.determineUnityVersion(
       Input.projectPath,
@@ -188,7 +189,12 @@ class BuildParameters {
     };
   }
 
-  static parseBuildFile(filename: string, platform: string, androidExportType: string): string {
+  static parseBuildFile(
+    filename: string,
+    platform: string,
+    androidExportType: string,
+    linux64RemoveExecutableExtension: boolean,
+  ): string {
     if (Platform.isWindows(platform)) {
       return `${filename}.exe`;
     }
@@ -208,6 +214,10 @@ class BuildParameters {
       }
     }
 
+    if (platform === Platform.types.StandaloneLinux64 && !linux64RemoveExecutableExtension) {
+      return `${filename}.x86_64`;
+    }
+
     return filename;
   }
 

src/model/input.test.ts

@@ -353,4 +353,22 @@ describe('Input', () => {
       expect(spy).toHaveBeenCalledTimes(1);
     });
   });
+
+  describe('linux64RemoveExecutableExtension', () => {
+    it('returns the default value', () => {
+      expect(Input.linux64RemoveExecutableExtension).toStrictEqual(false);
+    });
+
+    it('returns true when string true is passed', () => {
+      const spy = vi.spyOn(core, 'getInput').mockReturnValue('true');
+      expect(Input.linux64RemoveExecutableExtension).toStrictEqual(true);
+      expect(spy).toHaveBeenCalledTimes(1);
+    });
+
+    it('returns false when string false is passed', () => {
+      const spy = vi.spyOn(core, 'getInput').mockReturnValue('false');
+      expect(Input.linux64RemoveExecutableExtension).toStrictEqual(false);
+      expect(spy).toHaveBeenCalledTimes(1);
+    });
+  });
 });

src/model/input.ts

@@ -284,6 +284,12 @@ class Input {
     return Input.getInput('skipActivation')?.toLowerCase() ?? 'false';
   }
 
+  static get linux64RemoveExecutableExtension(): boolean {
+    const input = Input.getInput('linux64RemoveExecutableExtension') ?? 'false';
+
+    return input === 'true';
+  }
+
   public static ToEnvVarFormat(input: string) {
     if (input.toUpperCase() === input) {
       return input;