From: Ka-Ping Yee <ping@zesty.ca>
Date: Fri, 13 Apr 2001 13:53:07 +0000 (+0000)
Subject: Add inode checks to detect circular symbolic links (so that the
X-Git-Tag: v2.1c1~30
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=eca15c1fb19c94d3a424156d072266c8d327663d;p=thirdparty%2FPython%2Fcpython.git

Add inode checks to detect circular symbolic links (so that the
    Tools/idle/idlelib link doesn't cause an infinite loop -- aack!)
---

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index e5f7d800cbfa..5f372258c123 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -1458,7 +1458,8 @@ class ModuleScanner(Scanner):
     """An interruptible scanner that searches module synopses."""
     def __init__(self):
         roots = map(lambda dir: (dir, ''), pathdirs())
-        Scanner.__init__(self, roots, self.submodules, self.ispackage)
+        Scanner.__init__(self, roots, self.submodules, self.isnewpackage)
+        self.inodes = map(lambda (dir, pkg): os.stat(dir)[1], roots)
 
     def submodules(self, (dir, package)):
         children = []
@@ -1471,8 +1472,11 @@ class ModuleScanner(Scanner):
         children.sort() # so that spam.py comes before spam.pyc or spam.pyo
         return children
 
-    def ispackage(self, (dir, package)):
-        return ispackage(dir)
+    def isnewpackage(self, (dir, package)):
+        inode = os.stat(dir)[1] # detect circular symbolic links
+        if not (os.path.islink(dir) and inode in self.inodes):
+            self.inodes.append(inode)
+            return ispackage(dir)
 
     def run(self, callback, key=None, completer=None):
         if key: key = lower(key)