mirror of
https://github.com/apple/container.git
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74 lines
3.6 KiB
Swift
74 lines
3.6 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2026 Apple Inc. and the container 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 ContainerTestSupport
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import Foundation
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import Testing
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// Reads the ext4 root filesystem's on-disk superblock directly via dd/od,
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// since the standard warmup images don't ship e2fsprogs (no dumpe2fs) and
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// /proc/mounts doesn't expose the ext4 "data=" journal mode at all.
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//
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// Superblock layout (ext4(5)): the superblock starts at byte offset 1024 on
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// the device. s_feature_compat is a little-endian u32 at superblock+92; bit
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// 0x4 (EXT4_FEATURE_COMPAT_HAS_JOURNAL) indicates a journal exists. Only the
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// journal bit's own byte (offset 92, the field's low byte) is read since the
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// bit fits there. s_default_mount_opts is a little-endian u32 at
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// superblock+256; bits 0x60 select data=journal/ordered/writeback, and again
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// only the low byte (offset 256) is needed. Absolute device offsets are
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// therefore 1024+92=1116 and 1024+256=1280.
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@Suite
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struct TestCLIRunFilesystem {
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private let alpine = WarmupImage.alpine320
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private static let featureCompatOffset = 1116
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private static let defaultMountOptsOffset = 1280
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private static let hasJournalBit = 0x4
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private static let dataOrderedBits = 0x40
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@Test func testRootFilesystemHasOrderedJournal() async throws {
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try await ContainerFixture.with { f in
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let image = alpine.rawValue
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let c = "\(f.testID)-c"
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try await f.doLongRun(name: c, image: image, autoRemove: false, waitUntilRunning: true)
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f.addCleanup {
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try? f.doStop(c)
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try? f.doRemove(c)
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}
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let device = try f.doExec(c, cmd: ["sh", "-c", "mount | awk '$3 == \"/\" {print $1}'"])
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.trimmingCharacters(in: .whitespacesAndNewlines)
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try #require(!device.isEmpty, "could not determine the root filesystem's backing device")
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let featureCompat = try readSuperblockByte(f, c, device, Self.featureCompatOffset)
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#expect(
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featureCompat & Self.hasJournalBit != 0,
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"expected EXT4_FEATURE_COMPAT_HAS_JOURNAL set on the root filesystem superblock, got byte \(featureCompat)")
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let defaultMountOpts = try readSuperblockByte(f, c, device, Self.defaultMountOptsOffset)
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#expect(
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defaultMountOpts & Self.dataOrderedBits == Self.dataOrderedBits,
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"expected data=ordered default mount option on the root filesystem, got byte \(defaultMountOpts)")
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}
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}
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private func readSuperblockByte(_ f: ContainerFixture, _ container: String, _ device: String, _ offset: Int) throws -> Int {
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let output = try f.doExec(container, cmd: ["sh", "-c", "dd if=\(device) bs=1 skip=\(offset) count=1 2>/dev/null | od -An -tu1"])
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let trimmed = output.trimmingCharacters(in: .whitespacesAndNewlines)
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return try #require(Int(trimmed), "unexpected od output reading offset \(offset) of \(device): \(output)")
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}
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}
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