xdg: Read paths from user-dirs.dirs as bytes

Fixes #1676, #1725

docs/changelog.rst

@@ -4,6 +4,14 @@ Changelog
 
 This changelog is used to track all major changes to Mopidy.
 
+v2.2.2 (UNRELEASED)
+===================
+
+Bug fix release.
+
+- Files: Fix crash due to mix of text and bytes in paths that come from
+  ``$XDG_CONFIG_HOME/user-dirs.dirs``. (Fixes: :issue:`1676`, :issue:`1725`)
+
 
 v2.2.1 (2018-10-15)
 ===================

mopidy/internal/xdg.py

@@ -53,15 +53,16 @@ def _get_user_dirs(xdg_config_dir):
         return {}
 
     with open(dirs_file, 'rb') as fh:
-        data = fh.read().decode('utf-8')
+        data = fh.read()
 
-    data = '[XDG_USER_DIRS]\n' + data
-    data = data.replace('$HOME', os.path.expanduser('~'))
-    data = data.replace('"', '')
+    data = b'[XDG_USER_DIRS]\n' + data
+    data = data.replace(b'$HOME', os.path.expanduser(b'~'))
+    data = data.replace(b'"', b'')
 
     config = configparser.RawConfigParser()
-    config.readfp(io.StringIO(data))
+    config.readfp(io.BytesIO(data))
 
     return {
-        k.upper(): os.path.abspath(v)
-        for k, v in config.items('XDG_USER_DIRS') if v is not None}
+        k.upper().decode('utf-8'): os.path.abspath(v)
+        for k, v in config.items('XDG_USER_DIRS') if v is not None
+    }

tests/internal/test_xdg.py

@@ -21,9 +21,10 @@ def test_cache_dir_default(environ):
 
 
 def test_cache_dir_from_env(environ):
-    os.environ['XDG_CACHE_HOME'] = '/foo/bar'
+    os.environ['XDG_CACHE_HOME'] = b'/foo/bar'
 
-    assert xdg.get_dirs()['XDG_CACHE_DIR'] == '/foo/bar'
+    assert xdg.get_dirs()['XDG_CACHE_DIR'] == b'/foo/bar'
+    assert type(xdg.get_dirs()['XDG_CACHE_DIR']) == bytes
 
 
 def test_config_dir_default(environ):
@@ -31,9 +32,10 @@ def test_config_dir_default(environ):
 
 
 def test_config_dir_from_env(environ):
-    os.environ['XDG_CONFIG_HOME'] = '/foo/bar'
+    os.environ['XDG_CONFIG_HOME'] = b'/foo/bar'
 
-    assert xdg.get_dirs()['XDG_CONFIG_DIR'] == '/foo/bar'
+    assert xdg.get_dirs()['XDG_CONFIG_DIR'] == b'/foo/bar'
+    assert type(xdg.get_dirs()['XDG_CONFIG_DIR']) == bytes
 
 
 def test_data_dir_default(environ):
@@ -42,21 +44,23 @@ def test_data_dir_default(environ):
 
 
 def test_data_dir_from_env(environ):
-    os.environ['XDG_DATA_HOME'] = '/foo/bar'
+    os.environ['XDG_DATA_HOME'] = b'/foo/bar'
 
-    assert xdg.get_dirs()['XDG_DATA_DIR'] == '/foo/bar'
+    assert xdg.get_dirs()['XDG_DATA_DIR'] == b'/foo/bar'
+    assert type(xdg.get_dirs()['XDG_DATA_DIR']) == bytes
 
 
 def test_user_dirs(environ, tmpdir):
     os.environ['XDG_CONFIG_HOME'] = str(tmpdir)
 
     with open(os.path.join(str(tmpdir), 'user-dirs.dirs'), 'wb') as fh:
-        fh.write('# Some comments\n')
-        fh.write('XDG_MUSIC_DIR="$HOME/Music2"\n')
+        fh.write(b'# Some comments\n')
+        fh.write(b'XDG_MUSIC_DIR="$HOME/Music2"\n')
 
     result = xdg.get_dirs()
 
     assert result['XDG_MUSIC_DIR'] == os.path.expanduser(b'~/Music2')
+    assert type(result['XDG_MUSIC_DIR']) == bytes
     assert 'XDG_DOWNLOAD_DIR' not in result