From 477e1e01eadf5a79ce4b36634474f9c4802e538a Mon Sep 17 00:00:00 2001
From: Riceball LEE <snowyu.lee@gmail.com>
Date: Mon, 13 Aug 2012 16:53:34 +0800
Subject: [PATCH] + IsXattrExists and - remove 'user.' prefix for linux.

---
 xattr_linux.go | 95 +++++++++++++++++++++++++++-----------------------
 1 file changed, 52 insertions(+), 43 deletions(-)

diff --git a/xattr_linux.go b/xattr_linux.go
index 6e6bd22..9f97907 100644
--- a/xattr_linux.go
+++ b/xattr_linux.go
@@ -1,74 +1,83 @@
 package xattr
 
+/*
 import (
-	"strings"
+    "strings"
 )
 
 const (
-	userPrefix = "user."
+    userPrefix = "user."
 )
 
 // Linux xattrs have a manditory prefix of "user.". This is prepended 
 // transparently for Get/Set/Remove and hidden in List
+*/
+
+
+func IsXattrExists(path, name string) bool {
+    _, err := getxattr(path, name, nil, 0)
+    return err == nil
+}
 
 // Retrieve extended attribute data associated with path.
 func Getxattr(path, name string) ([]byte, error) {
-	name = userPrefix + name
-	// find size.
-	size, err := getxattr(path, name, nil, 0)
-	if err != nil {
-		return nil, &XAttrError{"getxattr", path, name, err}
-	}
-	buf := make([]byte, size)
-	// Read into buffer of that size.
-	read, err := getxattr(path, name, &buf[0], size)
-	if err != nil {
-		return nil, &XAttrError{"getxattr", path, name, err}
-	}
-	return buf[:read], nil
+    //name = userPrefix + name
+    // find size.
+    size, err := getxattr(path, name, nil, 0)
+    if err != nil {
+        return nil, &XAttrError{"getxattr", path, name, err}
+    }
+    buf := make([]byte, size)
+    // Read into buffer of that size.
+    read, err := getxattr(path, name, &buf[0], size)
+    if err != nil {
+        return nil, &XAttrError{"getxattr", path, name, err}
+    }
+    return buf[:read], nil
 }
 
 // Retrieves a list of names of extended attributes associated with the 
 // given path in the file system.
 func Listxattr(path string) ([]string, error) {
-	// find size.
-	size, err := listxattr(path, nil, 0)
-	if err != nil {
-		return nil, &XAttrError{"listxattr", path, "", err}
-	}
-	buf := make([]byte, size)
-	// Read into buffer of that size.
-	read, err := listxattr(path, &buf[0], size)
-	if err != nil {
-		return nil, &XAttrError{"listxattr", path, "", err}
-	}
-	return stripUserPrefix(nullTermToStrings(buf[:read])), nil
+    // find size.
+    size, err := listxattr(path, nil, 0)
+    if err != nil {
+        return nil, &XAttrError{"listxattr", path, "", err}
+    }
+    buf := make([]byte, size)
+    // Read into buffer of that size.
+    read, err := listxattr(path, &buf[0], size)
+    if err != nil {
+        return nil, &XAttrError{"listxattr", path, "", err}
+    }
+    return nullTermToStrings(buf[:read]), nil
+    //return stripUserPrefix(nullTermToStrings(buf[:read])), nil
 }
 
 // Associates name and data together as an attribute of path. 
 func Setxattr(path, name string, data []byte) error {
-	name = userPrefix + name
-	if err := setxattr(path, name, &data[0], len(data)); err != nil {
-		return &XAttrError{"setxattr", path, name, err}
-	}
-	return nil
+    //name = userPrefix + name
+    if err := setxattr(path, name, &data[0], len(data)); err != nil {
+        return &XAttrError{"setxattr", path, name, err}
+    }
+    return nil
 }
 
 // Remove the attribute.
 func Removexattr(path, name string) error {
-	name = userPrefix + name
-	if err := removexattr(path, name); err != nil {
-		return &XAttrError{"removexattr", path, name, err}
-	}
-	return nil
+    //name = userPrefix + name
+    if err := removexattr(path, name); err != nil {
+        return &XAttrError{"removexattr", path, name, err}
+    }
+    return nil
 }
 
 // Strip off "user." prefixes from attribute names.
 func stripUserPrefix(s []string) []string {
-	for i, a := range s {
-		if strings.HasPrefix(a, userPrefix) {
-			s[i] = a[5:]
-		}
-	}
-	return s
+    for i, a := range s {
+        if strings.HasPrefix(a, userPrefix) {
+            s[i] = a[5:]
+        }
+    }
+    return s
 }