From a4e468a2a0afa80df174831c2f422184820bb0fa Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Date: Thu, 6 Jan 2022 23:15:00 +0100
Subject: [PATCH] mozilla/certdata2pem.py: make cryptography module optional

The Python cryptography module is only used to verify if trusted
certificates have expired, but this is only a warning. For some build
systems and distributions, providing Python cryptography is costly,
especially since it's now partly written in Rust.

As the check is only a warning, it's anyway going to be overlooked by
most people. This commit changes the check to be optional: if the
cryptography Python module is there, we perform the check, otherwise
the check is skipped.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[Steve: refreshed to apply on ca-certificates version 20230311]
Signed-off-by: Steve Hay <me@stevenhay.com>
---
 mozilla/certdata2pem.py | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/mozilla/certdata2pem.py b/mozilla/certdata2pem.py
index 4df86a2..3a6d7dc 100644
--- a/mozilla/certdata2pem.py
+++ b/mozilla/certdata2pem.py
@@ -28,8 +28,6 @@ import sys
 import textwrap
 import io
 
-from cryptography import x509
-
 
 objects = []
 
@@ -122,11 +120,16 @@ for obj in objects:
         if not obj['CKA_LABEL'] in trust or not trust[obj['CKA_LABEL']]:
             continue
 
-        cert = x509.load_der_x509_certificate(bytes(obj['CKA_VALUE']))
-        if cert.not_valid_after < datetime.datetime.utcnow():
-            print('!'*74)
-            print('Trusted but expired certificate found: %s' % obj['CKA_LABEL'])
-            print('!'*74)
+        try:
+            from cryptography import x509
+
+            cert = x509.load_der_x509_certificate(bytes(obj['CKA_VALUE']))
+            if cert.not_valid_after < datetime.datetime.utcnow():
+                print('!'*74)
+                print('Trusted but expired certificate found: %s' % obj['CKA_LABEL'])
+                print('!'*74)
+        except ImportError:
+            pass
 
         bname = obj['CKA_LABEL'][1:-1].replace('/', '_')\
                                       .replace(' ', '_')\
-- 
2.30.2