xattr: simple wrapper for syscalls

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

xattr/xattr.go

@@ -0,0 +1,35 @@
+// +build linux
+
+package xattr
+
+import (
+	"strings"
+	"syscall"
+)
+
+// Get returns the extended attributes (xattr) on file `path`, for the given `name`.
+func Get(path, name string) ([]byte, error) {
+	dest := make([]byte, 1024)
+	i, err := syscall.Getxattr(path, name, dest)
+	if err != nil {
+		return nil, err
+	}
+	return dest[:i], nil
+}
+
+// Set sets the extended attributes (xattr) on file `path`, for the given `name` and `value`
+func Set(path, name string, value []byte) error {
+	return syscall.Setxattr(path, name, value, 0)
+}
+
+// List returns a list of all the extended attributes (xattr) for file `path`
+func List(path string) ([]string, error) {
+	dest := make([]byte, 1024)
+	i, err := syscall.Listxattr(path, dest)
+	if err != nil {
+		return nil, err
+	}
+	return strings.Split(strings.TrimRight(string(dest[:i]), nilByte), nilByte), nil
+}
+
+const nilByte = "\x00"