Skip xattr tests unless xattr is enabled on host

darc/testsuite/archiver.py

@@ -33,7 +33,7 @@ class ArchiverTestCase(DarcTestCase):
 
     def setUp(self):
         self.archiver = Archiver()
-        self.tmpdir = tempfile.mkdtemp(dir=os.getcwd())
+        self.tmpdir = tempfile.mkdtemp()
         self.repository_path = os.path.join(self.tmpdir, 'repository')
         self.repository_location = self.prefix + self.repository_path
         self.input_path = os.path.join(self.tmpdir, 'input')
@@ -123,7 +123,8 @@ class ArchiverTestCase(DarcTestCase):
         os.mknod('input/bdev', 0o600 | stat.S_IFBLK,  os.makedev(10, 20))
         # Char device
         os.mknod('input/cdev', 0o600 | stat.S_IFCHR,  os.makedev(30, 40))
-        xattr.set(os.path.join(self.input_path, 'file1'), b'foo', b'bar')
+        if xattr.is_enabled():
+            xattr.set(os.path.join(self.input_path, 'file1'), b'foo', b'bar')
         # Hard link
         os.link(os.path.join(self.input_path, 'file1'),
                 os.path.join(self.input_path, 'hardlink'))

darc/testsuite/xattr.py

@@ -1,13 +1,15 @@
-import tempfile
 import os
+import tempfile
+import unittest
 from darc.testsuite import DarcTestCase
-from darc.xattr import lsetxattr, llistxattr, lgetxattr, get_all, set, flistxattr, fgetxattr, fsetxattr
+from darc.xattr import lsetxattr, llistxattr, lgetxattr, get_all, set, flistxattr, fgetxattr, fsetxattr, is_enabled
 
 
+@unittest.skipUnless(is_enabled(), 'xattr not enabled on filesystem')
 class XattrTestCase(DarcTestCase):
 
     def setUp(self):
-        self.tmpfile = tempfile.NamedTemporaryFile(dir=os.getcwd())
+        self.tmpfile = tempfile.NamedTemporaryFile()
         self.symlink = os.path.join(os.path.dirname(self.tmpfile.name), 'symlink')
         os.symlink(self.tmpfile.name, self.symlink)
 

darc/xattr.py

@@ -4,12 +4,24 @@ On Linux only the "user." namespace is accessed
 """
 import os
 import sys
+import tempfile
 from ctypes import CDLL, create_string_buffer, c_ssize_t, c_size_t, c_char_p, c_int, c_uint32, get_errno
 from ctypes.util import find_library
 
 libc = CDLL(find_library('c'), use_errno=True)
 
 
+def is_enabled():
+    """Determine if xattr is enabled on the filesystem
+    """
+    with tempfile.TemporaryFile() as fd:
+        try:
+            set(fd.fileno(), b'name', b'value')
+        except OSError:
+            return False
+        return get_all(fd.fileno()) == {b'name': b'value'}
+
+
 def set(path_or_fd, name, value):
     if isinstance(path_or_fd, int):
         fsetxattr(path_or_fd, name, value)