19897: Add tests for writing immutable mount objects

I originally wrote these expecting to get them to return ENOTSUP as
well. However, that doesn't happen now because of how the Operations
class calls Directory.writable() and turns False into EPERM. I'm
committing the tests since they're useful as-is, with a note that I'd
like to convert them to ENOTSUP in the future.

Arvados-DCO-1.1-Signed-off-by: Brett Smith <brett.smith@curii.com>

diff --git a/services/fuse/tests/test_mount.py b/services/fuse/tests/test_mount.py
index fa2b27f1f8c551cc7e09290b736306e132b11969..f4e5138e2ce0fd5d1559046754f2c50a4f1c2ddb 100644 (file)
--- a/services/fuse/tests/test_mount.py
+++ b/services/fuse/tests/test_mount.py
@@ -1362,3 +1362,78 @@ class UnsupportedCreateTest(MountTestBase):
             with test_path.open('w'):
                 pass
         self.assertEqual(exc_check.exception.errno, errno.ENOTSUP)
+
+
+# FIXME: IMO, for consistency with the "create inside a project" case,
+# these operations should also return ENOTSUP instead of EPERM.
+# Right now they're returning EPERM because the clasess' writable() method
+# usually returns False, and the Operations class transforms that accordingly.
+# However, for cases where the mount will never be writable, I think ENOTSUP
+# is a clearer error: it lets the user know they can't fix the problem by
+# adding permissions in Arvados, etc.
+@parameterized.parameterized_class([
+    {'root_class': fusedir.MagicDirectory,
+     'preset_dir': 'by_id',
+     'preset_file': 'README',
+     },
+
+    {'root_class': fusedir.SharedDirectory,
+     'root_kwargs': {
+         'exclude': run_test_server.fixture('users')['admin']['uuid'],
+     },
+     'preset_dir': 'Active User',
+     },
+
+    {'root_class': fusedir.TagDirectory,
+     'root_kwargs': {
+         'tag': run_test_server.fixture('links')['foo_collection_tag']['name'],
+     },
+     'preset_dir': run_test_server.fixture('collections')['foo_collection_in_aproject']['uuid'],
+     },
+
+    {'root_class': fusedir.TagsDirectory,
+     'preset_dir': run_test_server.fixture('links')['foo_collection_tag']['name'],
+     },
+])
+class UnsupportedOperationsTest(UnsupportedCreateTest):
+    preset_dir = None
+    preset_file = None
+
+    def test_create(self):
+        test_path = Path(self.mounttmp, 'test_create')
+        with self.assertRaises(OSError) as exc_check:
+            with test_path.open('w'):
+                pass
+        self.assertEqual(exc_check.exception.errno, errno.EPERM)
+
+    def test_mkdir(self):
+        test_path = Path(self.mounttmp, 'test_mkdir')
+        with self.assertRaises(OSError) as exc_check:
+            test_path.mkdir()
+        self.assertEqual(exc_check.exception.errno, errno.EPERM)
+
+    def test_rename(self):
+        src_name = self.preset_dir or self.preset_file
+        if src_name is None:
+            return
+        test_src = Path(self.mounttmp, src_name)
+        test_dst = test_src.with_name('test_dst')
+        with self.assertRaises(OSError) as exc_check:
+            test_src.rename(test_dst)
+        self.assertEqual(exc_check.exception.errno, errno.EPERM)
+
+    def test_rmdir(self):
+        if self.preset_dir is None:
+            return
+        test_path = Path(self.mounttmp, self.preset_dir)
+        with self.assertRaises(OSError) as exc_check:
+            test_path.rmdir()
+        self.assertEqual(exc_check.exception.errno, errno.EPERM)
+
+    def test_unlink(self):
+        if self.preset_file is None:
+            return
+        test_path = Path(self.mounttmp, self.preset_file)
+        with self.assertRaises(OSError) as exc_check:
+            test_path.unlink()
+        self.assertEqual(exc_check.exception.errno, errno.EPERM)