| 1 | package fileops |
| 2 | |
| 3 | import ( |
| 4 | "os" |
| 5 | "path/filepath" |
| 6 | "testing" |
| 7 | "time" |
| 8 | ) |
| 9 | |
| 10 | func TestMutationLockSurvivesReplacement(t *testing.T) { |
| 11 | path := filepath.Join(t.TempDir(), "file") |
| 12 | if err := os.WriteFile(path, []byte("old"), 0o600); err != nil { |
| 13 | t.Fatal(err) |
| 14 | } |
| 15 | info, _ := os.Stat(path) |
| 16 | unlock := Lock(DiskTarget(path, info)) |
| 17 | if err := os.Rename(path, path+".old"); err != nil { |
| 18 | unlock() |
| 19 | t.Fatal(err) |
| 20 | } |
| 21 | if err := os.WriteFile(path, []byte("new"), 0o600); err != nil { |
| 22 | unlock() |
| 23 | t.Fatal(err) |
| 24 | } |
| 25 | info, _ = os.Stat(path) |
| 26 | started, acquired := make(chan struct{}), make(chan struct{}) |
| 27 | go func() { |
| 28 | close(started) |
| 29 | release := Lock(DiskTarget(path, info)) |
| 30 | release() |
| 31 | close(acquired) |
| 32 | }() |
| 33 | <-started |
| 34 | select { |
| 35 | case <-acquired: |
| 36 | unlock() |
| 37 | t.Fatal("replacement bypassed the in-flight mutation lock") |
| 38 | case <-time.After(50 * time.Millisecond): |
| 39 | } |
| 40 | unlock() |
| 41 | select { |
| 42 | case <-acquired: |
| 43 | case <-time.After(5 * time.Second): |
| 44 | t.Fatal("replacement lock did not release") |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | func TestLiveObservationCloneIsIndependent(t *testing.T) { |
| 49 | first := NewStore() |
| 50 | target := OverlayTarget("file") |
| 51 | first.ObservePresent(target, "v1") |
| 52 | second := first.Clone() |
| 53 | first.Forget(target) |
| 54 | if got := second.Get(target); got.Kind != Present || got.Version != "v1" { |
| 55 | t.Fatalf("live transfer lost observation: %+v", got) |
| 56 | } |
| 57 | second.ObservePresent(target, "v2") |
| 58 | if got := first.Get(target); got.Kind != Unseen { |
| 59 | t.Fatalf("replacement runtime mutated old runtime: %+v", got) |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | type linuxStatInfo struct { |
| 64 | os.FileInfo |
| 65 | meta any |
| 66 | } |
| 67 | |
| 68 | func (s linuxStatInfo) Sys() any { return s.meta } |
| 69 | |
| 70 | func TestDiskVersionIncludesLinuxCtim(t *testing.T) { |
| 71 | info, err := os.Stat(t.TempDir()) |
| 72 | if err != nil { |
| 73 | t.Fatal(err) |
| 74 | } |
| 75 | // Linux syscall.Stat_t uses Ctim, while Darwin uses Ctimespec. Keep this |
| 76 | // contract runnable on every host, with identical size, mode and mtime. |
| 77 | type timespec struct{ Sec, Nsec int64 } |
| 78 | type stat struct{ Ctim timespec } |
| 79 | before := linuxStatInfo{info, stat{timespec{1, 10}}} |
| 80 | after := linuxStatInfo{info, stat{timespec{1, 11}}} |
| 81 | if DiskVersion(before) == DiskVersion(after) { |
| 82 | t.Fatal("Linux Ctim nanosecond change was omitted from the version") |
| 83 | } |
| 84 | } |
| 85 |