Merge branch 'master' into debian-r

[dak.git] / tests / test_daklib_fstransactions.py

diff --git a/tests/test_daklib_fstransactions.py b/tests/test_daklib_fstransactions.py
new file mode 100755 (executable)
index 0000000..41a109b
--- /dev/null
+++ b/tests/test_daklib_fstransactions.py
@@ -0,0 +1,119 @@
+#! /usr/bin/env python
+#
+# Copyright (C) 2012, Ansgar Burchardt <ansgar@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+from base_test import DakTestCase
+from daklib.fstransactions import FilesystemTransaction
+
+from unittest import main
+
+import os
+import shutil
+import tempfile
+
+
+class TemporaryDirectory:
+    def __init__(self):
+        self.directory = None
+    def __str__(self):
+        return self.directory
+    def filename(self, suffix):
+        return os.path.join(self.directory, suffix)
+    def __enter__(self):
+        self.directory = tempfile.mkdtemp()
+        return self
+    def __exit__(self, *args):
+        if self.directory is not None:
+            shutil.rmtree(self.directory)
+            self.directory = None
+        return None
+
+class FilesystemTransactionTestCase(DakTestCase):
+    def _copy_a_b(self, tmp, fs, **kwargs):
+        fs.copy(tmp.filename('a'), tmp.filename('b'), **kwargs)
+
+    def _write_to_a(self, tmp):
+        with open(tmp.filename('a'), 'w') as fh:
+            print >>fh, 'a'
+
+    def test_copy_non_existing(self):
+        def copy():
+            with TemporaryDirectory() as t:
+                with FilesystemTransaction() as fs:
+                    self._copy_a_b(t, fs)
+
+        self.assertRaises(IOError, copy)
+
+    def test_copy_existing_and_commit(self):
+        with TemporaryDirectory() as t:
+            self._write_to_a(t)
+
+            with FilesystemTransaction() as fs:
+                self._copy_a_b(t, fs)
+                self.assert_(os.path.exists(t.filename('a')))
+                self.assert_(os.path.exists(t.filename('b')))
+
+            self.assert_(os.path.exists(t.filename('a')))
+            self.assert_(os.path.exists(t.filename('b')))
+
+    def test_copy_existing_and_rollback(self):
+        with TemporaryDirectory() as t:
+            self._write_to_a(t)
+
+            class TestException(Exception):
+                pass
+            try:
+                with FilesystemTransaction() as fs:
+                    self._copy_a_b(t, fs)
+                    self.assert_(os.path.exists(t.filename('a')))
+                    self.assert_(os.path.exists(t.filename('b')))
+                    raise TestException()
+            except TestException:
+                pass
+
+            self.assert_(os.path.exists(t.filename('a')))
+            self.assert_(not os.path.exists(t.filename('b')))
+
+    def test_unlink_and_commit(self):
+        with TemporaryDirectory() as t:
+            self._write_to_a(t)
+            a = t.filename('a')
+            with FilesystemTransaction() as fs:
+                self.assert_(os.path.exists(a))
+                fs.unlink(a)
+                self.assert_(not os.path.exists(a))
+            self.assert_(not os.path.exists(a))
+
+    def test_unlink_and_rollback(self):
+        with TemporaryDirectory() as t:
+            self._write_to_a(t)
+            a = t.filename('a')
+            class TestException(Exception):
+                pass
+
+            try:
+                with FilesystemTransaction() as fs:
+                    self.assert_(os.path.exists(a))
+                    fs.unlink(a)
+                    self.assert_(not os.path.exists(a))
+                    raise TestException()
+            except TestException:
+                pass
+            self.assert_(os.path.exists(a))
+
+if __name__ == '__main__':
+    main()