[options] Use parsed values when loading configuration

`--config-location=FILE` and abbreviated forms such as `--config-loc`
and `--ignore-conf` on the command line were missed because config
loading tested raw argv tokens. Check the parsed option values instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/test_options.py

@@ -8,6 +8,11 @@ import sys
 import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
+import io
+import shutil
+import tempfile
+
+from youtube_dl import options
 from youtube_dl.options import _hide_login_info
 
 
@@ -22,5 +27,80 @@ class TestOptions(unittest.TestCase):
                          ['--username=PRIVATE'])
 
 
+class TestConfig(unittest.TestCase):
+    def setUp(self):
+        self.test_dir = tempfile.mkdtemp()
+        self.config_file = os.path.join(self.test_dir, 'youtube-dl.conf')
+        with io.open(self.config_file, 'w', encoding='utf-8') as config:
+            config.write('--user-agent custom')
+
+    def tearDown(self):
+        shutil.rmtree(self.test_dir)
+
+    def _parse_options(self, args, system_config='', user_config=''):
+        old_argv, old_open = sys.argv, options.open
+
+        def fake_open(filename, **kwargs):
+            if filename == self.config_file:
+                return old_open(filename, **kwargs)
+            return io.StringIO(
+                system_config if filename == '/etc/youtube-dl.conf' else user_config)
+
+        sys.argv = ['youtube-dl'] + args
+        options.open = fake_open
+        try:
+            return options.parseOpts()[1]
+        finally:
+            sys.argv, options.open = old_argv, old_open
+
+    def test_config_defaults(self):
+        opts = self._parse_options([])
+        self.assertEqual(opts.config_location, None)
+        self.assertFalse(opts.ignore_config)
+        self.assertEqual(self._parse_options(
+            [], '--user-agent system', '--user-agent user').user_agent, 'user')
+
+    def test_config_location(self):
+        for args in (
+                ['--config-location', self.config_file],
+                ['--config-location=' + self.config_file],
+                ['--config-loc', self.config_file],
+                ['--config-loc=' + self.config_file]):
+            self.assertEqual(self._parse_options(
+                args, '--user-agent system', '--user-agent user').user_agent, 'custom')
+
+    def test_config_location_directory(self):
+        for args in (
+                ['--config-location', self.test_dir],
+                ['--config-location=' + self.test_dir]):
+            self.assertEqual(self._parse_options(args).user_agent, 'custom')
+
+    def test_config_location_missing(self):
+        missing = os.path.join(self.test_dir, 'missing.conf')
+        for args in (
+                ['--config-location', missing],
+                ['--config-location=' + missing]):
+            self.assertRaises(SystemExit, self._parse_options, args)
+
+    def test_ignore_config(self):
+        for flag in ('--ignore-config', '--ignore-conf'):
+            opts = self._parse_options(
+                [flag], '--user-agent system', '--user-agent user')
+            self.assertTrue(opts.ignore_config)
+            self.assertEqual(opts.user_agent, None)
+
+    def test_config_location_with_ignore_config(self):
+        for args in (
+                ['--ignore-config', '--config-location', self.config_file],
+                ['--config-location=' + self.config_file, '--ignore-config']):
+            self.assertEqual(self._parse_options(
+                args, '--user-agent system', '--user-agent user').user_agent, 'custom')
+
+    def test_command_line_overrides_config(self):
+        self.assertEqual(self._parse_options([
+            '--config-location=' + self.config_file,
+            '--user-agent', 'command-line']).user_agent, 'command-line')
+
+
 if __name__ == '__main__':
     unittest.main()

youtube_dl/options.py

@@ -916,14 +916,14 @@ def parseOpts(overrideArguments=None):
 
         system_conf = user_conf = custom_conf = []
 
-        if '--config-location' in command_line_conf:
+        if opts.config_location is not None:
             location = compat_expanduser(opts.config_location)
             if os.path.isdir(location):
                 location = os.path.join(location, 'youtube-dl.conf')
             if not os.path.exists(location):
                 parser.error('config-location %s does not exist.' % location)
             custom_conf = _readOptions(location)
-        elif '--ignore-config' in command_line_conf:
+        elif opts.ignore_config:
             pass
         else:
             system_conf = _readOptions('/etc/youtube-dl.conf')