From 3c83eedcc2df3ecf6c4a17953ca24dff60c1378e Mon Sep 17 00:00:00 2001
From: Romain Naour <romain.naour@gmail.com>
Date: Thu, 12 Nov 2020 00:16:18 +0100
Subject: [PATCH] lib/crypt: uClibc-ng doesn't set errno when encryption method
 is not available

Since commit [1] in cpython, an exception is raised when an encryption method
is not available. This eception is handled only if errno is set to EINVAL by
crypt() but uClibc-ng doesn't set errno in crypt() [2].

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/830981961
https://gitlab.com/buildroot.org/buildroot/-/jobs/830981979

[1] https://github.com/python/cpython/commit/0d3fe8ae4961bf551e7d5e42559e2ede1a08fd7c
[2] https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/libcrypt/crypt.c?h=v1.0.36#n29

Signed-off-by: Romain Naour <romain.naour@gmail.com>
---
 Lib/crypt.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/crypt.py b/Lib/crypt.py
index 33dbc46bb3..4692a5270c 100644
--- a/Lib/crypt.py
+++ b/Lib/crypt.py
@@ -94,7 +94,9 @@ def _add_method(name, *args, rounds=None):
         result = crypt('', salt)
     except OSError as e:
         # Not all libc libraries support all encryption methods.
-        if e.errno == errno.EINVAL:
+        # Not all libc libraries set errno when encryption method is not
+        # available.
+        if e.errno == errno.EINVAL or e.errno == 0:
             return False
         raise
     if result and len(result) == method.total_size:
-- 
2.25.4