move: build writes toolchain version into to Move.lock

Cargo.toml

@@ -183,7 +183,7 @@ members = [
 ]
 
 [workspace.package]
-# This version string will be inherited by sui-core, sui-faucet, sui-node, sui-tools, sui-sdk, and sui crates.
+# This version string will be inherited by sui-core, sui-faucet, sui-node, sui-tools, sui-sdk, sui-move-build, and sui crates.
 version = "1.16.0"
 
 [profile.release]

crates/sui-move-build/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sui-move-build"
-version = "0.0.0"
+version.workspace = true
 edition = "2021"
 authors = ["Mysten Labs <eng@mystenlabs.com>"]
 description = "Logic for building Sui Move Packages"

crates/sui-move-build/src/lib.rs

@@ -189,13 +189,24 @@ impl BuildConfig {
         let print_diags_to_stderr = self.print_diags_to_stderr;
         let run_bytecode_verifier = self.run_bytecode_verifier;
         let resolution_graph = self.resolution_graph(&path)?;
-        build_from_resolution_graph(
-            path,
+        let result = build_from_resolution_graph(
+            path.clone(),
             resolution_graph,
             run_bytecode_verifier,
             print_diags_to_stderr,
             lint,
-        )
+        );
+        if let Ok(ref compiled) = result {
+            compiled
+                .package
+                .compiled_package_info
+                .build_flags
+                .update_lock_file_toolchain_version(&path, env!("CARGO_PKG_VERSION").into())
+                .map_err(|e| SuiError::ModuleBuildFailure {
+                    error: format!("Failed to update Move.lock toolchain version: {e}"),
+                })?;
+        }
+        result
     }
 
     pub fn resolution_graph(mut self, path: &Path) -> SuiResult<ResolvedGraph> {

external-crates/move/crates/move-package/src/lib.rs

@@ -172,6 +172,7 @@ impl BuildConfig {
         let lock_string = std::fs::read_to_string(path.join(SourcePackageLayout::Lock.path())).ok();
         let _mutx = PackageLock::lock(); // held until function returns
 
+        let install_dir_set = self.install_dir.is_some();
         let install_dir = self.install_dir.as_ref().unwrap_or(&path).to_owned();
 
         let mut dep_graph_builder = DependencyGraphBuilder::new(
@@ -186,7 +187,9 @@ impl BuildConfig {
             lock_string,
         )?;
 
-        if modified {
+        if modified || install_dir_set {
+            // (1) Write the Move.lock file if the existing one is `modified`, or
+            // (2) `install_dir` is set explicitly, which may be a different directory, and where a Move.lock does not exist yet.
             let lock = dependency_graph.write_to_lock(install_dir)?;
             if let Some(lock_path) = &self.lock_file {
                 lock.commit(lock_path)?;
@@ -218,14 +221,15 @@ impl BuildConfig {
             .set_silence_warnings(self.silence_warnings)
     }
 
-    pub fn update_lock_file_toolchain_version(&self, compiler_version: String) -> Result<()> {
+    pub fn update_lock_file_toolchain_version(
+        &self,
+        path: &PathBuf,
+        compiler_version: String,
+    ) -> Result<()> {
         let Some(lock_file) = self.lock_file.as_ref() else {
             return Ok(());
         };
-        let install_dir = self
-            .install_dir
-            .clone()
-            .unwrap_or_else(|| PathBuf::from("."));
+        let install_dir = self.install_dir.as_ref().unwrap_or(path).to_owned();
         let mut lock = LockFile::from(install_dir, lock_file)?;
         lock.seek(SeekFrom::Start(0))?;
         update_compiler_toolchain(

external-crates/move/crates/move-package/tests/test_lock_file.rs

@@ -82,7 +82,8 @@ fn update_lock_file_toolchain_version() {
     build_config.default_flavor = Some(Flavor::Sui);
     build_config.default_edition = Some(Edition::E2024_ALPHA);
     build_config.lock_file = Some(lock_path.clone());
-    let _ = build_config.update_lock_file_toolchain_version("0.0.1".into());
+    let _ =
+        build_config.update_lock_file_toolchain_version(pkg.path().to_path_buf(), "0.0.1".into());
 
     let mut lock_file = File::open(lock_path).unwrap();
     let toolchain_version =