wehub-resource-sync
680845cb1c
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81 lines
3.4 KiB
Swift
81 lines
3.4 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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import CloudHypervisor
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import Foundation
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extension Mount {
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/// Returns a `CloudHypervisor.DiskConfig` describing this mount as a virtio-blk
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/// device, or `nil` if the mount is not a block device.
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///
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/// The caller supplies the device id; cloud-hypervisor uses it both as a
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/// stable handle for hotplug-remove and as the udev/sysfs identifier inside
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/// the guest.
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///
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/// `imageType` defaults to `.raw` because Containerization mounts are
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/// always raw block files (ext4 produced by the EXT4 unpacker, NBD URLs,
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/// etc.). When cloud-hypervisor doesn't see an `image_type` it falls
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/// back to `Unknown` and silently rejects all writes — see CH's
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/// `virtio-devices/src/block.rs` "Attempting to write to sector 0 on a
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/// disk without specifying image_type" warning.
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public func chDiskConfig(id: String) -> CloudHypervisor.DiskConfig? {
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guard case .virtioblk = self.runtimeOptions else {
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return nil
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}
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return CloudHypervisor.DiskConfig(
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path: self.source,
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readonly: self.options.contains("ro"),
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direct: nil,
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iommu: nil,
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id: id,
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pciSegment: nil,
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imageType: .raw
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)
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}
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/// Returns a `CloudHypervisor.FsConfig` describing this mount as a virtio-fs
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/// share served by an out-of-process `virtiofsd`, or `nil` if the mount is
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/// not a virtiofs share.
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///
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/// `tag` is the guest-side mount tag and `socketPath` is the UDS path the
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/// virtiofsd subprocess publishes. Both are owned by the caller.
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public func chFsConfig(tag: String, socketPath: String, id: String) -> CloudHypervisor.FsConfig? {
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guard case .virtiofs = self.runtimeOptions else {
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return nil
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}
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return CloudHypervisor.FsConfig(
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tag: tag,
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socket: socketPath,
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numQueues: nil,
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queueSize: nil,
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id: id,
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pciSegment: nil
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)
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}
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}
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/// Build the host-side UDS path for a virtiofsd ↔ cloud-hypervisor socket.
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///
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/// `tag` is the full source-hash (used as the FUSE tag advertised to the
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/// guest); the socket *path* uses only an 8-char prefix because the full
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/// path — `<workDir>/virtiofs-<tag>.sock` with a 36-char tag — overshoots
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/// Linux's 108-byte `SUN_LEN` limit. 32 bits of disambiguation is more
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/// than enough within a single VM (handful of distinct virtiofs sources).
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func chVirtiofsSocketURL(workDir: URL, tag: String) -> URL {
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let short = String(tag.prefix(8))
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return workDir.appendingPathComponent("vfs-\(short).sock")
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}
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