Add Cargo.lock to sdist when --locked or --frozen specified

Changelog.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Add support for x86_64 Haiku in [#735](https://github.com/PyO3/maturin/pull/735)
 * Fix undefined auditwheel policy panic in [#740](https://github.com/PyO3/maturin/pull/740)
 * Fix sdist upload for packages where the pkgname contains multiple underscores in [#741](https://github.com/PyO3/maturin/pull/741)
+* Add `Cargo.lock` to sdist when `--locked` or `--frozen` specified in [#749](https://github.com/PyO3/maturin/pull/749)
 
 ## [0.12.4] - 2021-12-06
 

src/build_context.rs

@@ -230,6 +230,10 @@ impl BuildContext {
         fs::create_dir_all(&self.out)
             .context("Failed to create the target directory for the source distribution")?;
 
+        let include_cargo_lock = self
+            .cargo_extra_args
+            .iter()
+            .any(|arg| arg == "--locked" || arg == "--frozen");
         match PyProjectToml::new(self.manifest_path.parent().unwrap()) {
             Ok(pyproject) => {
                 let sdist_path = source_distribution(
@@ -238,6 +242,7 @@ impl BuildContext {
                     &self.manifest_path,
                     &self.cargo_metadata,
                     pyproject.sdist_include(),
+                    include_cargo_lock,
                 )
                 .context("Failed to build source distribution")?;
                 Ok(Some((sdist_path, "source".to_string())))

src/source_distribution.rs

@@ -235,6 +235,7 @@ pub fn source_distribution(
     manifest_path: impl AsRef<Path>,
     cargo_metadata: &Metadata,
     sdist_include: Option<&Vec<String>>,
+    include_cargo_lock: bool,
 ) -> Result<PathBuf> {
     let known_path_deps = find_path_deps(cargo_metadata)?;
 
@@ -271,6 +272,11 @@ pub fn source_distribution(
     )?;
 
     let manifest_dir = manifest_path.as_ref().parent().unwrap();
+    if include_cargo_lock {
+        let cargo_lock_path = manifest_dir.join("Cargo.lock");
+        let target = root_dir.join("Cargo.lock");
+        writer.add_file(&target, &cargo_lock_path)?;
+    }
 
     if let Some(include_targets) = sdist_include {
         for pattern in include_targets {