fix(test): use NTFS junctions and platform guards for symlink tests on Windows (openclaw#28747) thanks @arosstale

Verified:
- pnpm install --frozen-lockfile
- pnpm test src/agents/apply-patch.test.ts src/agents/sandbox/fs-bridge.test.ts src/agents/sandbox/validate-sandbox-security.test.ts src/infra/archive.test.ts

Co-authored-by: arosstale <117890364+arosstale@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/agents/apply-patch.test.ts

@@ -148,6 +148,10 @@ describe("applyPatch", () => {
   });
 
   it("rejects symlink escape attempts by default", async () => {
+    // File symlinks require SeCreateSymbolicLinkPrivilege on Windows.
+    if (process.platform === "win32") {
+      return;
+    }
     await withTempDir(async (dir) => {
       const outside = path.join(path.dirname(dir), "outside-target.txt");
       const linkPath = path.join(dir, "link.txt");
@@ -232,6 +236,10 @@ describe("applyPatch", () => {
   });
 
   it("allows symlinks that resolve within cwd by default", async () => {
+    // File symlinks require SeCreateSymbolicLinkPrivilege on Windows.
+    if (process.platform === "win32") {
+      return;
+    }
     await withTempDir(async (dir) => {
       const target = path.join(dir, "target.txt");
       const linkPath = path.join(dir, "link.txt");
@@ -259,7 +267,9 @@ describe("applyPatch", () => {
       await fs.writeFile(outsideFile, "victim\n", "utf8");
 
       const linkDir = path.join(dir, "linkdir");
-      await fs.symlink(outsideDir, linkDir);
+      // Use 'junction' on Windows — junctions target directories without
+      // requiring SeCreateSymbolicLinkPrivilege.
+      await fs.symlink(outsideDir, linkDir, process.platform === "win32" ? "junction" : undefined);
 
       const patch = `*** Begin Patch
 *** Delete File: linkdir/victim.txt
@@ -310,7 +320,13 @@ describe("applyPatch", () => {
         await fs.writeFile(outsideTarget, "keep\n", "utf8");
 
         const linkDir = path.join(dir, "link");
-        await fs.symlink(outsideDir, linkDir);
+        // Use 'junction' on Windows — junctions target directories without
+        // requiring SeCreateSymbolicLinkPrivilege.
+        await fs.symlink(
+          outsideDir,
+          linkDir,
+          process.platform === "win32" ? "junction" : undefined,
+        );
 
         const patch = `*** Begin Patch
 *** Delete File: link

src/agents/sandbox/fs-bridge.test.ts

@@ -308,6 +308,10 @@ describe("sandbox fs bridge shell compatibility", () => {
   it("rejects pre-existing host symlink escapes before docker exec", async () => {
     await withTempDir("openclaw-fs-bridge-", async (stateDir) => {
       const { workspaceDir, outsideFile } = await createHostEscapeFixture(stateDir);
+      // File symlinks require SeCreateSymbolicLinkPrivilege on Windows.
+      if (process.platform === "win32") {
+        return;
+      }
       await fs.symlink(outsideFile, path.join(workspaceDir, "link.txt"));
 
       const bridge = createSandboxFsBridge({

src/agents/sandbox/validate-sandbox-security.test.ts

@@ -103,17 +103,22 @@ describe("validateBindMounts", () => {
   });
 
   it("blocks symlink escapes into blocked directories", () => {
-    const dir = mkdtempSync(join(tmpdir(), "openclaw-sbx-"));
-    const link = join(dir, "etc-link");
-    symlinkSync("/etc", link);
-    const run = () => validateBindMounts([`${link}/passwd:/mnt/passwd:ro`]);
-
     if (process.platform === "win32") {
-      // Windows source paths (e.g. C:\...) are intentionally rejected as non-POSIX.
+      // Symlinks to non-existent targets like /etc require
+      // SeCreateSymbolicLinkPrivilege on Windows.  The Windows branch of this
+      // test does not need a real symlink — it only asserts that Windows source
+      // paths are rejected as non-POSIX.
+      const dir = mkdtempSync(join(tmpdir(), "openclaw-sbx-"));
+      const fakePath = join(dir, "etc-link", "passwd");
+      const run = () => validateBindMounts([`${fakePath}:/mnt/passwd:ro`]);
       expect(run).toThrow(/non-absolute source path/);
       return;
     }
 
+    const dir = mkdtempSync(join(tmpdir(), "openclaw-sbx-"));
+    const link = join(dir, "etc-link");
+    symlinkSync("/etc", link);
+    const run = () => validateBindMounts([`${link}/passwd:/mnt/passwd:ro`]);
     expect(run).toThrow(/blocked path/);
   });