bpo-43757: Make pathlib use os.path.realpath() to resolve symlinks in a path (GH-25264)
Also adds a new "strict" argument to realpath() to avoid changing the default behaviour of pathlib while sharing the implementation.
diff --git a/Lib/test/test_ntpath.py b/Lib/test/test_ntpath.py
index f97aca5..661c59d 100644
--- a/Lib/test/test_ntpath.py
+++ b/Lib/test/test_ntpath.py
@@ -271,6 +271,17 @@ def test_realpath_basic(self):
@os_helper.skip_unless_symlink
@unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
+ def test_realpath_strict(self):
+ # Bug #43757: raise FileNotFoundError in strict mode if we encounter
+ # a path that does not exist.
+ ABSTFN = ntpath.abspath(os_helper.TESTFN)
+ os.symlink(ABSTFN + "1", ABSTFN)
+ self.addCleanup(os_helper.unlink, ABSTFN)
+ self.assertRaises(FileNotFoundError, ntpath.realpath, ABSTFN, strict=True)
+ self.assertRaises(FileNotFoundError, ntpath.realpath, ABSTFN + "2", strict=True)
+
+ @os_helper.skip_unless_symlink
+ @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
def test_realpath_relative(self):
ABSTFN = ntpath.abspath(os_helper.TESTFN)
open(ABSTFN, "wb").close()
@@ -340,8 +351,9 @@ def test_realpath_broken_symlinks(self):
@os_helper.skip_unless_symlink
@unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
def test_realpath_symlink_loops(self):
- # Symlink loops are non-deterministic as to which path is returned, but
- # it will always be the fully resolved path of one member of the cycle
+ # Symlink loops in non-strict mode are non-deterministic as to which
+ # path is returned, but it will always be the fully resolved path of
+ # one member of the cycle
ABSTFN = ntpath.abspath(os_helper.TESTFN)
self.addCleanup(os_helper.unlink, ABSTFN)
self.addCleanup(os_helper.unlink, ABSTFN + "1")
@@ -385,6 +397,50 @@ def test_realpath_symlink_loops(self):
@os_helper.skip_unless_symlink
@unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
+ def test_realpath_symlink_loops_strict(self):
+ # Symlink loops raise OSError in strict mode
+ ABSTFN = ntpath.abspath(os_helper.TESTFN)
+ self.addCleanup(os_helper.unlink, ABSTFN)
+ self.addCleanup(os_helper.unlink, ABSTFN + "1")
+ self.addCleanup(os_helper.unlink, ABSTFN + "2")
+ self.addCleanup(os_helper.unlink, ABSTFN + "y")
+ self.addCleanup(os_helper.unlink, ABSTFN + "c")
+ self.addCleanup(os_helper.unlink, ABSTFN + "a")
+
+ os.symlink(ABSTFN, ABSTFN)
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN, strict=True)
+
+ os.symlink(ABSTFN + "1", ABSTFN + "2")
+ os.symlink(ABSTFN + "2", ABSTFN + "1")
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1", strict=True)
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN + "2", strict=True)
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1\\x", strict=True)
+ # Windows eliminates '..' components before resolving links, so the
+ # following call is not expected to raise.
+ self.assertPathEqual(ntpath.realpath(ABSTFN + "1\\..", strict=True),
+ ntpath.dirname(ABSTFN))
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1\\..\\x", strict=True)
+ os.symlink(ABSTFN + "x", ABSTFN + "y")
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1\\..\\"
+ + ntpath.basename(ABSTFN) + "y",
+ strict=True)
+ self.assertRaises(OSError, ntpath.realpath,
+ ABSTFN + "1\\..\\" + ntpath.basename(ABSTFN) + "1",
+ strict=True)
+
+ os.symlink(ntpath.basename(ABSTFN) + "a\\b", ABSTFN + "a")
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN + "a", strict=True)
+
+ os.symlink("..\\" + ntpath.basename(ntpath.dirname(ABSTFN))
+ + "\\" + ntpath.basename(ABSTFN) + "c", ABSTFN + "c")
+ self.assertRaises(OSError, ntpath.realpath, ABSTFN + "c", strict=True)
+
+ # Test using relative path as well.
+ self.assertRaises(OSError, ntpath.realpath, ntpath.basename(ABSTFN),
+ strict=True)
+
+ @os_helper.skip_unless_symlink
+ @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
def test_realpath_symlink_prefix(self):
ABSTFN = ntpath.abspath(os_helper.TESTFN)
self.addCleanup(os_helper.unlink, ABSTFN + "3")