[diffoscope] 01/01: Add comment regarding why difficult to optimise calls to lsattr

[Chris Lamb]

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lamby pushed a commit to branch master
in repository diffoscope.

commit 79727d52cf3006d4a90a2bc1fbd2ab40c5c97622
Author: Chris Lamb <lamby at debian.org>
Date:   Wed Dec 7 14:22:28 2016 +0000

    Add comment regarding why difficult to optimise calls to lsattr
---
 diffoscope/comparators/directory.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/diffoscope/comparators/directory.py b/diffoscope/comparators/directory.py
index b02589f..8e5d10b 100644
--- a/diffoscope/comparators/directory.py
+++ b/diffoscope/comparators/directory.py
@@ -64,6 +64,11 @@ class Stat(Command):
 
 @tool_required('lsattr')
 def lsattr(path):
+    """
+    NB. Difficult to replace with in-Python version. See
+    <http://stackoverflow.com/questions/35501249/python-get-linux-file-immutable-attribute/38092961#38092961>
+    """
+
     try:
         output = subprocess.check_output(['lsattr', '-d', path], shell=False, stderr=subprocess.STDOUT).decode('utf-8')
         return output.split()[0]

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