This fixes Chtimes on systems with 32 bit Timespec

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

system/chtimes.go

@@ -2,14 +2,30 @@ package system
 
 import (
 	"os"
+	"syscall"
 	"time"
+	"unsafe"
 )
 
+var (
+	maxTime time.Time
+)
+
+func init() {
+	if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 {
+		// This is a 64 bit timespec
+		// os.Chtimes limits time to the following
+		maxTime = time.Unix(0, 1<<63-1)
+	} else {
+		// This is a 32 bit timespec
+		maxTime = time.Unix(1<<31-1, 0)
+	}
+}
+
 // Chtimes changes the access time and modified time of a file at the given path
 func Chtimes(name string, atime time.Time, mtime time.Time) error {
 	unixMinTime := time.Unix(0, 0)
-	// The max Unix time is 33 bits set
-	unixMaxTime := unixMinTime.Add((1<<33 - 1) * time.Second)
+	unixMaxTime := maxTime
 
 	// If the modified time is prior to the Unix Epoch, or after the
 	// end of Unix Time, os.Chtimes has undefined behavior