Windows: Fix warning on info

Signed-off-by: John Howard <jhoward@microsoft.com>

fileutils/fileutils.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -143,17 +142,6 @@ func CopyFile(src, dst string) (int64, error) {
 	return io.Copy(df, sf)
 }
 
-// GetTotalUsedFds Returns the number of used File Descriptors by
-// reading it via /proc filesystem.
-func GetTotalUsedFds() int {
-	if fds, err := ioutil.ReadDir(fmt.Sprintf("/proc/%d/fd", os.Getpid())); err != nil {
-		logrus.Errorf("Error opening /proc/%d/fd: %s", os.Getpid(), err)
-	} else {
-		return len(fds)
-	}
-	return -1
-}
-
 // ReadSymlinkedDirectory returns the target directory of a symlink.
 // The target of the symbolic link may not be a file.
 func ReadSymlinkedDirectory(path string) (string, error) {

fileutils/fileutils_unix.go

@@ -0,0 +1,22 @@
+// +build linux freebsd
+
+package fileutils
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/Sirupsen/logrus"
+)
+
+// GetTotalUsedFds Returns the number of used File Descriptors by
+// reading it via /proc filesystem.
+func GetTotalUsedFds() int {
+	if fds, err := ioutil.ReadDir(fmt.Sprintf("/proc/%d/fd", os.Getpid())); err != nil {
+		logrus.Errorf("Error opening /proc/%d/fd: %s", os.Getpid(), err)
+	} else {
+		return len(fds)
+	}
+	return -1
+}

fileutils/fileutils_windows.go

@@ -0,0 +1,7 @@
+package fileutils
+
+// GetTotalUsedFds Returns the number of used File Descriptors. Not supported
+// on Windows.
+func GetTotalUsedFds() int {
+	return -1
+}