lock: use canonical base dir to compute relavite directories

To avoid symlink issues.

Author: sbidoul

src/pip/_internal/commands/lock.py

@@ -159,7 +159,7 @@ def run(self, options: Values, args: List[str]) -> int:
                     "%s is not a valid lock file name.",
                     output_file_path,
                 )
-            base_dir = output_file_path.parent.absolute()
+            base_dir = output_file_path.parent
         pylock_toml = Pylock.from_install_requirements(
             requirement_set.requirements.values(), base_dir=base_dir
         ).as_toml()

src/pip/_internal/models/pylock.py

@@ -88,6 +88,7 @@ class Package:
 
     @classmethod
     def from_install_requirement(cls, ireq: InstallRequirement, base_dir: Path) -> Self:
+        base_dir = base_dir.resolve()
         dist = ireq.get_dist()
         download_info = ireq.download_info
         assert download_info
@@ -105,6 +106,7 @@ def from_install_requirement(cls, ireq: InstallRequirement, base_dir: Path) -> S
                 package.directory = PackageDirectory(
                     path=(
                         Path(url_to_path(download_info.url))
+                        .resolve()
                         .relative_to(base_dir)
                         .as_posix()
                     ),