feat: add openshell sandbox backend

extensions/openshell/src/mirror.ts

@@ -0,0 +1,47 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+
+export async function replaceDirectoryContents(params: {
+  sourceDir: string;
+  targetDir: string;
+}): Promise<void> {
+  await fs.mkdir(params.targetDir, { recursive: true });
+  const existing = await fs.readdir(params.targetDir);
+  await Promise.all(
+    existing.map((entry) =>
+      fs.rm(path.join(params.targetDir, entry), {
+        recursive: true,
+        force: true,
+      }),
+    ),
+  );
+  const sourceEntries = await fs.readdir(params.sourceDir);
+  for (const entry of sourceEntries) {
+    await fs.cp(path.join(params.sourceDir, entry), path.join(params.targetDir, entry), {
+      recursive: true,
+      force: true,
+      dereference: false,
+    });
+  }
+}
+
+export async function movePathWithCopyFallback(params: {
+  from: string;
+  to: string;
+}): Promise<void> {
+  try {
+    await fs.rename(params.from, params.to);
+    return;
+  } catch (error) {
+    const code = (error as NodeJS.ErrnoException | null)?.code;
+    if (code !== "EXDEV") {
+      throw error;
+    }
+  }
+  await fs.cp(params.from, params.to, {
+    recursive: true,
+    force: true,
+    dereference: false,
+  });
+  await fs.rm(params.from, { recursive: true, force: true });
+}