fix(cli): init creates its files where hard links are refused, with no Developer Mode needed (#6463)

packages/cli/src/utils/projectConfig.create.test.ts

@@ -12,7 +12,11 @@ import {
 
 vi.mock("node:fs", async (importOriginal) => {
   const original = await importOriginal<typeof fs>();
-  return { ...original, readFileSync: vi.fn(original.readFileSync) };
+  return {
+    ...original,
+    readFileSync: vi.fn(original.readFileSync),
+    linkSync: vi.fn(original.linkSync),
+  };
 });
 
 const dirs: string[] = [];
@@ -43,6 +47,18 @@ describe("project config creation", () => {
     expect(JSON.parse(fs.readFileSync(path, "utf-8"))).toEqual(updated);
   });
 
+  it("creates the config on a volume or sandbox that refuses hard links (EPERM)", () => {
+    const dir = project();
+    vi.mocked(fs.linkSync).mockImplementationOnce(() => {
+      throw Object.assign(new Error("operation not permitted"), { code: "EPERM" });
+    });
+    createProjectConfig(dir);
+    expect(JSON.parse(fs.readFileSync(projectConfigPath(dir), "utf-8"))).toEqual(
+      DEFAULT_PROJECT_CONFIG,
+    );
+    expect(fs.readdirSync(dir)).toEqual(["hyperframes.json"]);
+  });
+
   it("preserves a config created after the skill seed reads ENOENT", () => {
     const dir = project();
     const path = projectConfigPath(dir);

packages/cli/src/utils/writeNewFile.ts

@@ -1,18 +1,10 @@
-import { linkSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
-import { dirname, join } from "node:path";
+import { createFileAtomically } from "@hyperframes/core/atomic-file";
 
 /** Publish complete content without replacing or following an existing destination entry. */
 export function writeNewFileSync(filePath: string, content: string): void {
-  const stagingDir = mkdtempSync(join(dirname(filePath), ".hf-create-"));
   try {
-    const stagedPath = join(stagingDir, "content");
-    writeFileSync(stagedPath, content, { encoding: "utf-8", flag: "wx" });
-    try {
-      linkSync(stagedPath, filePath);
-    } catch (err) {
-      if (!(err instanceof Error && "code" in err && err.code === "EEXIST")) throw err;
-    }
-  } finally {
-    rmSync(stagingDir, { recursive: true, force: true });
+    createFileAtomically(filePath, content);
+  } catch (err) {
+    if (!(err instanceof Error && "code" in err && err.code === "EEXIST")) throw err;
   }
 }