fix(KAN-58): accept empty unversioned bucket response

native/publish-macos.mjs

@@ -94,7 +94,26 @@ export async function publishMacos({
             ...args,
         ]);
     }
-    const versioning = JSON.parse(s3('get-bucket-versioning', []));
+    const versioningOutput = s3('get-bucket-versioning', [
+        '--output',
+        'json',
+    ]).trim();
+    let versioning;
+    try {
+        // AWS CLI prints nothing for a successful empty VersioningConfiguration.
+        versioning = JSON.parse(versioningOutput || '{}');
+    } catch {
+        throw new Error('Invalid JSON from S3 bucket versioning check.');
+    }
+    if (
+        !versioning ||
+        typeof versioning !== 'object' ||
+        Array.isArray(versioning)
+    ) {
+        throw new Error(
+            'Invalid S3 bucket versioning response: expected an object.',
+        );
+    }
     if (versioning.Status) {
         throw new Error(
             'Use an unversioned release bucket: Hetzner does not support conditional writes on versioned buckets.',

native/tests/publish-macos.test.js

@@ -38,7 +38,8 @@ function fixture(t) {
         const key = value('--key');
         events.push({ operation, key });
         if (operation === 'get-bucket-versioning') {
-            return '{}';
+            assert.equal(value('--output'), 'json');
+            return '';
         }
         if (operation === 'put-object') {
             assert.equal(value('--if-none-match'), '*');
@@ -103,6 +104,33 @@ test('uploads immutable files and writes completion record after public verifica
     });
 });
 
+for (const response of ['', ' \n\t', '{}']) {
+    test(`unversioned bucket response ${JSON.stringify(response)} permits a verified upload`, async (t) => {
+        const f = fixture(t);
+        const run = f.run;
+        f.run = (command, args) => {
+            const result = run(command, args);
+            return args.includes('get-bucket-versioning') ? response : result;
+        };
+        await publishMacos(f);
+        assert.equal(f.objects.size, 3);
+        assert.equal(f.events.at(-1).operation, 'public-get');
+        assert(f.events.at(-1).key.endsWith('/release.json'));
+    });
+}
+
+for (const response of ['{', 'null', '[]', '"Enabled"', 'false']) {
+    test(`invalid versioning response ${response} aborts before any upload`, async (t) => {
+        const f = fixture(t);
+        f.run = (_command, args) => {
+            assert(args.includes('get-bucket-versioning'));
+            return response;
+        };
+        await assert.rejects(publishMacos(f), /Invalid .*versioning/);
+        assert.equal(f.objects.size, 0);
+    });
+}
+
 test('retry accepts byte-identical objects without replacing them', async (t) => {
     const f = fixture(t);
     await publishMacos(f);