Function TestMutable

pkg/fs/fs_test.go:269–330

(t *testing.T)

}

func TestMutable(t *testing.T) {
	condSkip(t)
	inEmptyMutDir(t, func(env *mountEnv, rootDir string) {
		filename := filepath.Join(rootDir, "x")
		f, err := os.Create(filename)
		if err != nil {
			t.Fatalf("Create: %v", err)
		}
		if err := f.Close(); err != nil {
			t.Fatalf("Close: %v", err)
		}
		fi, err := os.Stat(filename)
		if err != nil {
			t.Errorf("Stat error: %v", err)
		} else if !fi.Mode().IsRegular() || fi.Size() != 0 {
			t.Errorf("Stat of roots/r/x = %v size %d; want a %d byte regular file", fi.Mode(), fi.Size(), 0)
		}

		for _, str := range []string{"foo, ", "bar\n", "another line.\n"} {
			f, err = os.OpenFile(filename, os.O_WRONLY|os.O_APPEND, 0644)
			if err != nil {
				t.Fatalf("OpenFile: %v", err)
			}
			if _, err := f.Write([]byte(str)); err != nil {
				t.Logf("Error with append: %v", err)
				t.Fatalf("Error appending %q to %s: %v", str, filename, err)
			}
			if err := f.Close(); err != nil {
				t.Fatal(err)
			}
		}
		ro0 := env.Stat(mutFileOpenRO)
		slurp, err := os.ReadFile(filename)
		if err != nil {
			t.Fatal(err)
		}
		if env.Stat(mutFileOpenRO)-ro0 != 1 {
			t.Error("Read didn't trigger read-only path optimization.")
		}

		const want = "foo, bar\nanother line.\n"
		fi, err = os.Stat(filename)
		if err != nil {
			t.Errorf("Stat error: %v", err)
		} else if !fi.Mode().IsRegular() || fi.Size() != int64(len(want)) {
			t.Errorf("Stat of roots/r/x = %v size %d; want a %d byte regular file", fi.Mode(), fi.Size(), len(want))
		}
		if got := string(slurp); got != want {
			t.Fatalf("contents = %q; want %q", got, want)
		}

		// Delete it.
		if err := os.Remove(filename); err != nil {
			t.Fatal(err)
		}

		// Gone?
		if _, err := os.Stat(filename); !os.IsNotExist(err) {