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