Fixed file modified time not changing on Windows

Signed-off-by: Darren Stahl <darst@microsoft.com>

system/chtimes_test.go

@@ -0,0 +1,120 @@
+package system
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+// prepareTempFile creates a temporary file in a temporary directory.
+func prepareTempFile(t *testing.T) (string, string) {
+	dir, err := ioutil.TempDir("", "docker-system-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	file := filepath.Join(dir, "exist")
+	if err := ioutil.WriteFile(file, []byte("hello"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	return file, dir
+}
+
+// TestChtimes tests Chtimes on a tempfile. Test only mTime, because aTime is OS dependent
+func TestChtimes(t *testing.T) {
+	file, dir := prepareTempFile(t)
+	defer os.RemoveAll(dir)
+
+	beforeUnixEpochTime := time.Unix(0, 0).Add(-100 * time.Second)
+	unixEpochTime := time.Unix(0, 0)
+	afterUnixEpochTime := time.Unix(100, 0)
+	// The max Unix time is 33 bits set
+	unixMaxTime := unixEpochTime.Add((1<<33 - 1) * time.Second)
+	afterUnixMaxTime := unixMaxTime.Add(100 * time.Second)
+
+	// Test both aTime and mTime set to Unix Epoch
+	Chtimes(file, unixEpochTime, unixEpochTime)
+
+	f, err := os.Stat(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ModTime() != unixEpochTime {
+		t.Fatalf("Expected: %s, got: %s", unixEpochTime, f.ModTime())
+	}
+
+	// Test aTime before Unix Epoch and mTime set to Unix Epoch
+	Chtimes(file, beforeUnixEpochTime, unixEpochTime)
+
+	f, err = os.Stat(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ModTime() != unixEpochTime {
+		t.Fatalf("Expected: %s, got: %s", unixEpochTime, f.ModTime())
+	}
+
+	// Test aTime set to Unix Epoch and mTime before Unix Epoch
+	Chtimes(file, unixEpochTime, beforeUnixEpochTime)
+
+	f, err = os.Stat(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ModTime() != unixEpochTime {
+		t.Fatalf("Expected: %s, got: %s", unixEpochTime, f.ModTime())
+	}
+
+	// Test both aTime and mTime set to after Unix Epoch (valid time)
+	Chtimes(file, afterUnixEpochTime, afterUnixEpochTime)
+
+	f, err = os.Stat(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ModTime() != afterUnixEpochTime {
+		t.Fatalf("Expected: %s, got: %s", afterUnixEpochTime, f.ModTime())
+	}
+
+	// Test both aTime and mTime set to Unix max time
+	Chtimes(file, unixMaxTime, unixMaxTime)
+
+	f, err = os.Stat(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ModTime() != unixMaxTime {
+		t.Fatalf("Expected: %s, got: %s", unixMaxTime, f.ModTime())
+	}
+
+	// Test aTime after Unix max time and mTime set to Unix max time
+	Chtimes(file, afterUnixMaxTime, unixMaxTime)
+
+	f, err = os.Stat(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ModTime() != unixMaxTime {
+		t.Fatalf("Expected: %s, got: %s", unixMaxTime, f.ModTime())
+	}
+
+	// Test aTime set to Unix Epoch and mTime before Unix Epoch
+	Chtimes(file, unixMaxTime, afterUnixMaxTime)
+
+	f, err = os.Stat(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ModTime() != unixEpochTime {
+		t.Fatalf("Expected: %s, got: %s", unixEpochTime, f.ModTime())
+	}
+}