| 1 | //go:build linux && rootrunner |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "os" |
| 8 | "os/exec" |
| 9 | "path/filepath" |
| 10 | "strconv" |
| 11 | "strings" |
| 12 | "testing" |
| 13 | "time" |
| 14 | |
| 15 | "golang.org/x/sys/unix" |
| 16 | ) |
| 17 | |
| 18 | func TestRootRebootServingParkGrownDiskPhase1(t *testing.T) { |
| 19 | TestRootRebootServingParkChangedMountPhase1(t) |
| 20 | } |
| 21 | |
| 22 | func TestRootRebootServingParkGrownDiskPhase2(t *testing.T) { |
| 23 | TestRootRebootServingParkChangedMountPhase2(t) |
| 24 | } |
| 25 | |
| 26 | // Capture retirement on a small ext4 filesystem, grow it online, then attach it |
| 27 | // under a different device number after reboot. Neither identity change is a seam. |
| 28 | func servingRunnerGrownDisk(t *testing.T, data string, first bool) func() { |
| 29 | t.Helper() |
| 30 | command := func(args ...string) string { |
| 31 | t.Helper() |
| 32 | out, err := exec.CommandContext(t.Context(), args[0], args[1:]...).CombinedOutput() |
| 33 | if err != nil { |
| 34 | t.Fatalf("grown disk %q: %v %s", args, err, out) |
| 35 | } |
| 36 | return strings.TrimSpace(string(out)) |
| 37 | } |
| 38 | image := filepath.Join(servingRebootRoot, "grow.ext4") |
| 39 | deviceFile := filepath.Join(servingRebootRoot, "grow.device") |
| 40 | uuidFile := filepath.Join(servingRebootRoot, "grow.uuid") |
| 41 | create := func(path string, size int64) { |
| 42 | t.Helper() |
| 43 | f, err := os.OpenFile(path, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0600) |
| 44 | if err != nil { |
| 45 | t.Fatal(err) |
| 46 | } |
| 47 | err = f.Truncate(size) |
| 48 | closeErr := f.Close() |
| 49 | if err != nil || closeErr != nil { |
| 50 | t.Fatal(err, closeErr) |
| 51 | } |
| 52 | } |
| 53 | detach := func(device string) { |
| 54 | t.Cleanup(func() { |
| 55 | ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) |
| 56 | defer cancel() |
| 57 | if out, err := exec.CommandContext(ctx, "losetup", "--detach", device).CombinedOutput(); err != nil { |
| 58 | t.Errorf("detach %s: %v %s", device, err, out) |
| 59 | } |
| 60 | }) |
| 61 | } |
| 62 | if first { |
| 63 | if err := os.Mkdir(data, 0700); err != nil { |
| 64 | t.Fatal(err) |
| 65 | } |
| 66 | create(image, 128<<20) |
| 67 | command("mkfs.ext4", "-q", "-F", image) |
| 68 | } else { |
| 69 | old, err := os.ReadFile(deviceFile) |
| 70 | if err != nil { |
| 71 | t.Fatal(err) |
| 72 | } |
| 73 | suffix := strings.TrimPrefix(string(old), "/dev/loop") |
| 74 | if suffix == string(old) { |
| 75 | t.Fatal("invalid loop path") |
| 76 | } |
| 77 | if _, err := strconv.ParseUint(suffix, 10, 32); err != nil { |
| 78 | t.Fatal(err) |
| 79 | } |
| 80 | blocker := filepath.Join(servingRebootRoot, "blocker") |
| 81 | create(blocker, 1<<20) |
| 82 | command("losetup", string(old), blocker) |
| 83 | detach(string(old)) |
| 84 | } |
| 85 | device := command("losetup", "--find", "--show", image) |
| 86 | detach(device) |
| 87 | uuid := command("blkid", "-s", "UUID", "-o", "value", device) |
| 88 | if first { |
| 89 | if err := os.WriteFile(deviceFile, []byte(device), 0600); err != nil { |
| 90 | t.Fatal(err) |
| 91 | } |
| 92 | if err := os.WriteFile(uuidFile, []byte(uuid), 0600); err != nil { |
| 93 | t.Fatal(err) |
| 94 | } |
| 95 | } else { |
| 96 | old, err := os.ReadFile(deviceFile) |
| 97 | if err != nil || string(old) == device { |
| 98 | t.Fatal("device did not change", err) |
| 99 | } |
| 100 | saved, err := os.ReadFile(uuidFile) |
| 101 | if err != nil || uuid == "" || string(saved) != uuid { |
| 102 | t.Fatal("filesystem UUID changed", err) |
| 103 | } |
| 104 | } |
| 105 | if err := unix.Mount(device, data, "ext4", unix.MS_NOSUID|unix.MS_NODEV, ""); err != nil { |
| 106 | t.Fatal(err) |
| 107 | } |
| 108 | t.Cleanup(func() { |
| 109 | if err := unix.Unmount(data, 0); err != nil { |
| 110 | t.Error(err) |
| 111 | } |
| 112 | }) |
| 113 | var st unix.Statfs_t |
| 114 | if err := unix.Statfs(data, &st); err != nil { |
| 115 | t.Fatal(err) |
| 116 | } |
| 117 | t.Logf("grown filesystem: device=%s uuid=%s blocks=%d blocksize=%d", device, uuid, st.Blocks, st.Bsize) |
| 118 | if !first { |
| 119 | if st.Blocks*uint64(st.Bsize) <= 128<<20 { |
| 120 | t.Fatal("grown capacity lost across reboot") |
| 121 | } |
| 122 | return nil |
| 123 | } |
| 124 | return func() { |
| 125 | t.Helper() |
| 126 | if err := os.Truncate(image, 256<<20); err != nil { |
| 127 | t.Fatal(err) |
| 128 | } |
| 129 | command("losetup", "--set-capacity", device) |
| 130 | t.Log(command("resize2fs", device)) |
| 131 | var grown unix.Statfs_t |
| 132 | if err := unix.Statfs(data, &grown); err != nil { |
| 133 | t.Fatal(err) |
| 134 | } |
| 135 | if grown.Blocks <= st.Blocks || grown.Fsid != st.Fsid || command("blkid", "-s", "UUID", "-o", "value", device) != uuid { |
| 136 | t.Fatal("grow changed identity or did not increase capacity") |
| 137 | } |
| 138 | command("sync", "-f", data) |
| 139 | t.Logf("grew filesystem: blocks %d -> %d, filesystem identity unchanged", st.Blocks, grown.Blocks) |
| 140 | } |
| 141 | } |
| 142 | |
amadan