fix: Try the read the lock file even if the version is incompatible (#1278)

news/1273.bugfix.md

+Try to read the lock file even if the lock version is incompatible.

pdm/cli/actions.py

@@ -165,7 +165,7 @@ def check_lockfile(project: Project, raise_not_exist: bool = True) -> str | None
             style="yellow",
             err=True,
         )
-        return "all"
+        return "reuse"  # try to reuse the lockfile if possible
     elif not project.is_lockfile_hash_match():
         project.core.ui.echo(
             "Lock file hash doesn't match pyproject.toml, packages may be outdated",

pdm/models/environment.py

@@ -208,8 +208,8 @@ class Environment:
                     downloaded = finder.download_and_unpack(
                         best_match.link, dirname, dirname
                     )
-                except unearth.UnpackError:
-                    raise download_error
+                except unearth.UnpackError as e:
+                    raise download_error from e
                 shutil.move(str(downloaded), path)
 
     @cached_property

pdm/models/repositories.py

@@ -208,7 +208,7 @@ class BaseRepository:
         try:
             result = self._candidate_info_cache.get(candidate)
         except KeyError:
-            raise CandidateInfoNotFound(candidate)
+            raise CandidateInfoNotFound(candidate) from None
         return result
 
     @cache_result
@@ -399,7 +399,7 @@ class LockedRepository(BaseRepository):
 
         for key, hashes in lockfile.get("metadata", {}).get("files", {}).items():
             self.file_hashes[tuple(key.split(None, 1))] = {  # type: ignore
-                Link(item["url"]): item["hash"] for item in hashes
+                Link(item["url"]): item["hash"] for item in hashes if "url" in item
             }
 
     def _identify_candidate(self, candidate: Candidate) -> tuple:

pdm/models/versions.py

@@ -49,7 +49,7 @@ class Version:
                         raise InvalidPyVersion(
                             f"{version_str}: postreleases are not supported "
                             "for python version specifiers."
-                        )
+                        ) from None
             version = tuple(bits)
         self._version: Tuple[VersionBit, ...] = version
 

pdm/project/core.py

@@ -452,17 +452,21 @@ class Project:
             normalize_name(k): v
             for k, v in self.tool_settings.get("overrides", {}).items()
         }
-        if strategy != "all" and not self.is_lockfile_compatible():
-            self.core.ui.echo(
-                "Updating the whole lock file as it is not compatible with PDM",
-                style="yellow",
-                err=True,
-            )
-            strategy = "all"
-        if not for_install and strategy == "all":
-            return BaseProvider(repository, allow_prereleases, overrides)
+        locked_repository: LockedRepository | None = None
+        if strategy != "all" or for_install:
+            try:
+                locked_repository = self.locked_repository
+            except Exception:
+                if for_install:
+                    raise
+                self.core.ui.echo(
+                    "Unable to reuse the lock file as it is not compatible with PDM",
+                    style="yellow",
+                    err=True,
+                )
 
-        locked_repository = self.locked_repository
+        if locked_repository is None:
+            return BaseProvider(repository, allow_prereleases, overrides)
         if for_install:
             return BaseProvider(locked_repository, allow_prereleases, overrides)
         provider_class = (