fix: only quote string when the requirement is a URL

src/pdm/backend/base.py

@@ -166,6 +166,7 @@ def clean(self, context: Context) -> None:
             shutil.rmtree(context.build_dir)
 
     def initialize(self, context: Context) -> None:
+        """Initialize the build context."""
         self.call_hook("pdm_build_initialize", context)
 
     def get_files(self, context: Context) -> Iterable[tuple[str, Path]]:

src/pdm/backend/utils.py

@@ -201,13 +201,18 @@ def expand_vars(line: str, root: str) -> str:
     """Expand environment variables in a string."""
     if "$" not in line:
         return line
-    line = line.replace("${PROJECT_ROOT}", root.lstrip("/"))
+
+    if "://" in line:
+        quote: Callable[[str], str] = urllib.parse.quote
+    else:
+        quote = str
+    line = line.replace("${PROJECT_ROOT}", quote(root).lstrip("/"))
 
     def replace_func(match: Match[str]) -> str:
         rv = os.getenv(match.group(1))
         if rv is None:
             return match.group(0)
-        return urllib.parse.quote(rv)
+        return quote(rv)
 
     return re.sub(r"\$\{(.+?)\}", replace_func, line)
 

src/pdm/backend/wheel.py

@@ -83,16 +83,6 @@ def _get_platform_tags(self) -> tuple[str | None, str | None, str | None]:
             plat_name = self.config_settings["--plat-name"]
         return python_tag, py_limited_api, plat_name
 
-    def prepare_metadata(self, metadata_directory: str) -> Path:
-        """Write the dist-info files under the given directory"""
-        context = self.build_context(Path(metadata_directory))
-        self.initialize(context)
-        return self._write_dist_info(Path(metadata_directory))
-
-    def initialize(self, context: Context) -> None:
-        self._fix_dependencies()
-        return super().initialize(context)
-
     def _fix_dependencies(self) -> None:
         """Fix the dependencies and remove dynamic variables from the metadata"""
         metadata = self.config.metadata
@@ -107,6 +97,16 @@ def _fix_dependencies(self) -> None:
                     expand_vars(dep, root) for dep in deps
                 ]
 
+    def initialize(self, context: Context) -> None:
+        self._fix_dependencies()
+        return super().initialize(context)
+
+    def prepare_metadata(self, metadata_directory: str) -> Path:
+        """Write the dist-info files under the given directory"""
+        context = self.build_context(Path(metadata_directory))
+        self.initialize(context)
+        return self._write_dist_info(Path(metadata_directory))
+
     def _collect_files(self, context: Context, root: Path) -> FileMap:
         files = super()._collect_files(context, root)
         if root == self.location: