macOS: Bundle mozilla's root certificates with kitty

Apple doesnt provide root certificates in a form useable by openssl
which means all ssl based network requests fail, so bundle our own

Fixes #3936

__main__.py

@@ -123,17 +123,29 @@ def setup_openssl_environment() -> None:
     # out of their asses and implement a common location for SSL certificates.
     # It's not that hard people, there exists a wonderful tool called the symlink
     # See https://www.mobileread.com/forums/showthread.php?t=256095
-    if 'SSL_CERT_FILE' not in os.environ and 'SSL_CERT_DIR' not in os.environ:
-        if os.access('/etc/pki/tls/certs/ca-bundle.crt', os.R_OK):
-            os.environ['SSL_CERT_FILE'] = '/etc/pki/tls/certs/ca-bundle.crt'
+    #
+    # Also load bundled certs on macOS since Apple tries to make everyone use
+    # their NIH SSL library instead of OpenSSL.
+    if 'SSL_CERT_FILE' in os.environ or 'SSL_CERT_DIR' in os.environ:
+        return
+    candidates = ['/etc/pki/tls/certs/ca-bundle.crt']
+    ext_dir = getattr(sys, 'kitty_extensions_dir', '')
+    if ext_dir:
+        if 'darwin' in sys.platform.lower():
+            d = os.path.dirname
+            candidates.append(os.path.join(d(d(d(ext_dir))), 'cacert.pem'))
+    for q in candidates:
+        if os.access(q, os.R_OK):
+            os.environ['SSL_CERT_FILE'] = q
             setattr(sys, 'kitty_ssl_env_var', 'SSL_CERT_FILE')
-        elif os.path.isdir('/etc/ssl/certs'):
+            return
+    if os.path.isdir('/etc/ssl/certs'):
         os.environ['SSL_CERT_DIR'] = '/etc/ssl/certs'
         setattr(sys, 'kitty_ssl_env_var', 'SSL_CERT_DIR')
 
 
 def main() -> None:
-    if getattr(sys, 'frozen', False) and 'darwin' not in sys.platform.lower():
+    if getattr(sys, 'frozen', False):
         setup_openssl_environment()
     first_arg = '' if len(sys.argv) < 2 else sys.argv[1]
     func = entry_points.get(first_arg)

bypy/macos/__main__.py

@@ -170,6 +170,7 @@ class Freeze(object):
         self.add_stdlib()
         self.add_misc_libraries()
         self.freeze_python()
+        self.add_ca_certs()
         if not self.dont_strip:
             self.strip_files()
         if not self.skip_tests:
@@ -180,6 +181,16 @@ class Freeze(object):
 
         return ret
 
+    @flush
+    def add_ca_certs(self):
+        print('\nDownloading CA certs...')
+        from urllib.request import urlopen
+        ca_certs_url = 'https://curl.haxx.se/ca/cacert.pem'
+        certs = urlopen(ca_certs_url).read()
+        dest = os.path.join(self.contents_dir, 'Resources', 'cacert.pem')
+        with open(dest, 'wb') as f:
+            f.write(certs)
+
     @flush
     def strip_files(self):
         print('\nStripping files...')

docs/changelog.rst

@@ -4,6 +4,13 @@ Changelog
 |kitty| is a feature-rich, cross-platform, *fast*, GPU based terminal.
 To update |kitty|, :doc:`follow the instructions <binary>`.
 
+0.23.1 [future]
+----------------------
+
+- macOS: Fix themes kitten failing to download themes because of missing SSL
+  certificates (:iss:`3936`)
+
+- A new :doc:`themes kitten </kittens/themes>` to easily change kitty themes.
 0.23.0 [2021-08-16]
 ----------------------