chore: import upstream snapshot with attribution

2026-07-13 12:25:30 +08:00
commit 680845cb1c
445 changed files with 103779 additions and 0 deletions
@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2026 Apple Inc. and the Containerization project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+extension Kernel {
+    /// Build the `init=/sbin/vminitd` Linux kernel command line for the given
+    /// rootfs type. Used by both the VZ and cloud-hypervisor backends since
+    /// the guest's vminitd init contract is identical across VMMs.
+    func linuxCommandline(initialFilesystem: Mount) -> String {
+        var args = self.commandLine.kernelArgs
+
+        args.append("init=/sbin/vminitd")
+        // rootfs is always mounted read-only.
+        args.append("ro")
+
+        switch initialFilesystem.type {
+        case "virtiofs":
+            args.append(contentsOf: [
+                "rootfstype=virtiofs",
+                "root=rootfs",
+            ])
+        case "ext4":
+            args.append(contentsOf: [
+                "rootfstype=ext4",
+                "root=/dev/vda",
+            ])
+        default:
+            fatalError("unsupported initfs filesystem \(initialFilesystem.type)")
+        }
+
+        if self.commandLine.initArgs.count > 0 {
+            args.append("--")
+            args.append(contentsOf: self.commandLine.initArgs)
+        }
+
+        return args.joined(separator: " ")
+    }
+}