Encode binary xattr values

1 files changed, 9 insertions, 1 deletions

diff --git a/summainlib.py b/summainlib.py
index 07895e1..e148760 100644
--- a/summainlib.py
+++ b/summainlib.py
@@ -14,6 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+import base64
 import grp
 import hashlib
 import hmac
@@ -220,7 +221,14 @@ class FilesystemObject(object):
     def _compute_xattrs(self): # pragma: no cover
         if len(self._xattrs) == 0:
             return ''
-        parts = ['  %s=%s' % (k, self._xattrs[k]) for k in self._xattrs]
+
+        def quote(s):
+            if s.isalnum():
+                return '"%s"' % s
+            else:
+                return '0s' + base64.urlsafe_b64encode(s)
+
+        parts = ['  %s=%s' % (k, quote(self._xattrs[k])) for k in self._xattrs]
         return '\n' + '\n'.join(parts)
         
     def format_time(self, secs, nsecs):