qcow2 SAL + rhai script to test functionality

packages/system/virt/tests/rhai/04_qcow2_basic.rhai

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+// Basic tests for QCOW2 SAL (offline, will skip if qemu-img is not present)
+
+print("=== QCOW2 Basic Tests ===");
+
+// Dependency check
+let qemu = which("qemu-img");
+if qemu == () {
+    print("⚠️  qemu-img not available - skipping QCOW2 tests");
+    print("Install qemu-utils (Debian/Ubuntu) or QEMU tools for your distro.");
+    print("=== QCOW2 Tests Skipped ===");
+    exit();
+}
+
+// Helper: unique temp path
+let now = 0;
+try {
+    // if process module exists you could pull a timestamp; fallback to random-ish suffix
+    now = 100000 + (rand() % 100000);
+} catch (err) {
+    now = 100000 + (rand() % 100000);
+}
+let img_path = `/tmp/qcow2_test_${now}.img`;
+
+print("\n--- Test 1: Create image ---");
+let create_res = qcow2_create(img_path, 1);
+if create_res.is_err() {
+    print(`❌ Create failed: ${create_res.unwrap_err()}`);
+    exit();
+}
+print(`✓ Created qcow2: ${img_path}`);
+
+print("\n--- Test 2: Info ---");
+let info_res = qcow2_info(img_path);
+if info_res.is_err() {
+    print(`❌ Info failed: ${info_res.unwrap_err()}`);
+    exit();
+}
+let info = info_res.unwrap();
+print("✓ Info fetched");
+if info.format != () { print(`  format: ${info.format}`); }
+if info["virtual-size"] != () { print(`  virtual-size: ${info["virtual-size"]}`); }
+
+print("\n--- Test 3: Snapshot create/list/delete (offline) ---");
+let snap_name = "s1";
+let screate = qcow2_snapshot_create(img_path, snap_name);
+if screate.is_err() {
+    print(`❌ snapshot_create failed: ${screate.unwrap_err()}`);
+    exit();
+}
+print("✓ snapshot created: s1");
+
+let slist = qcow2_snapshot_list(img_path);
+if slist.is_err() {
+    print(`❌ snapshot_list failed: ${slist.unwrap_err()}`);
+    exit();
+}
+let snaps = slist.unwrap();
+print(`✓ snapshot_list ok, count=${snaps.len()}`);
+
+let sdel = qcow2_snapshot_delete(img_path, snap_name);
+if sdel.is_err() {
+    print(`❌ snapshot_delete failed: ${sdel.unwrap_err()}`);
+    exit();
+}
+print("✓ snapshot deleted: s1");
+
+// Optional: Base image builder (commented to avoid big downloads by default)
+// Uncomment to test manually on a dev machine with bandwidth.
+// print("\n--- Optional: Build Ubuntu 24.04 Base ---");
+// let base_dir = "/tmp/virt_images";
+// let base = qcow2_build_ubuntu_24_04_base(base_dir, 10);
+// if base.is_err() {
+//     print(`⚠️  base build failed or skipped: ${base.unwrap_err()}`);
+// } else {
+//     let m = base.unwrap();
+//     print(`✓ Base image path: ${m.base_image_path}`);
+//     print(`✓ Base snapshot: ${m.snapshot}`);
+//     print(`✓ Source URL: ${m.url}`);
+//     if m.resized_to_gb != () { print(`✓ Resized to: ${m.resized_to_gb}G`); }
+// }
+
+print("\n=== QCOW2 Basic Tests Completed ===");