Only use relative paths in lockfile (#6490)

For users who were using absolute paths in the `pyproject.toml`
previously, this is a behavior change: We now convert all absolute paths
in `path` entries to relative paths. Since i assume that no-one relies
on absolute path in their lockfiles - they are intended to be portable -
I'm tagging this as a bugfix.

Closes https://github.com/astral-sh/uv/pull/6438
Fixes https://github.com/astral-sh/uv/issues/6371

crates/uv-requirements/src/lookahead.rs

@@ -283,26 +283,17 @@ fn required_dist(requirement: &Requirement) -> Result<Option<Dist>, distribution
         }
         RequirementSource::Path {
             install_path,
-            lock_path,
             ext,
             url,
-        } => Dist::from_file_url(
-            requirement.name.clone(),
-            url.clone(),
-            install_path,
-            lock_path,
-            *ext,
-        )?,
+        } => Dist::from_file_url(requirement.name.clone(), url.clone(), install_path, *ext)?,
         RequirementSource::Directory {
             install_path,
-            lock_path,
             url,
             editable,
         } => Dist::from_directory_url(
             requirement.name.clone(),
             url.clone(),
             install_path,
-            lock_path,
             *editable,
         )?,
     }))

crates/uv-requirements/src/source_tree.rs

@@ -171,7 +171,6 @@ impl<'a, Context: BuildContext> SourceTreeResolver<'a, Context> {
         let source = SourceUrl::Directory(DirectorySourceUrl {
             url: &url,
             install_path: Cow::Borrowed(source_tree),
-            lock_path: Cow::Borrowed(source_tree),
             editable: false,
         });
 

crates/uv-requirements/src/unnamed.rs

@@ -256,7 +256,6 @@ impl<'a, Context: BuildContext> NamedRequirementsResolver<'a, Context> {
                 SourceUrl::Directory(DirectorySourceUrl {
                     url: &requirement.url.verbatim,
                     install_path: Cow::Borrowed(&parsed_directory_url.install_path),
-                    lock_path: Cow::Borrowed(&parsed_directory_url.lock_path),
                     editable: parsed_directory_url.editable,
                 })
             }