[codex] Add symlink flag to fs metadata (#17719)

Add `is_symlink` to FsMetadata struct.

codex-rs/exec-server/src/file_system.rs

@@ -25,6 +25,7 @@ pub struct CopyOptions {
 pub struct FileMetadata {
     pub is_directory: bool,
     pub is_file: bool,
+    pub is_symlink: bool,
     pub created_at_ms: i64,
     pub modified_at_ms: i64,
 }

codex-rs/exec-server/src/fs_helper.rs

@@ -214,6 +214,7 @@ pub(crate) async fn run_direct_request(
             Ok(FsHelperPayload::GetMetadata(FsGetMetadataResponse {
                 is_directory: metadata.is_directory,
                 is_file: metadata.is_file,
+                is_symlink: metadata.is_symlink,
                 created_at_ms: metadata.created_at_ms,
                 modified_at_ms: metadata.modified_at_ms,
             }))

codex-rs/exec-server/src/local_file_system.rs

@@ -286,9 +286,11 @@ impl ExecutorFileSystem for DirectFileSystem {
     ) -> FileSystemResult<FileMetadata> {
         reject_sandbox_context(sandbox)?;
         let metadata = tokio::fs::metadata(path.as_path()).await?;
+        let symlink_metadata = tokio::fs::symlink_metadata(path.as_path()).await?;
         Ok(FileMetadata {
             is_directory: metadata.is_dir(),
             is_file: metadata.is_file(),
+            is_symlink: symlink_metadata.file_type().is_symlink(),
             created_at_ms: metadata.created().ok().map_or(0, system_time_to_unix_ms),
             modified_at_ms: metadata.modified().ok().map_or(0, system_time_to_unix_ms),
         })

codex-rs/exec-server/src/protocol.rs

@@ -199,6 +199,7 @@ pub struct FsGetMetadataParams {
 pub struct FsGetMetadataResponse {
     pub is_directory: bool,
     pub is_file: bool,
+    pub is_symlink: bool,
     pub created_at_ms: i64,
     pub modified_at_ms: i64,
 }

codex-rs/exec-server/src/remote_file_system.rs

@@ -115,6 +115,7 @@ impl ExecutorFileSystem for RemoteFileSystem {
         Ok(FileMetadata {
             is_directory: response.is_directory,
             is_file: response.is_file,
+            is_symlink: response.is_symlink,
             created_at_ms: response.created_at_ms,
             modified_at_ms: response.modified_at_ms,
         })

codex-rs/exec-server/src/sandboxed_file_system.rs

@@ -138,6 +138,7 @@ impl ExecutorFileSystem for SandboxedFileSystem {
         Ok(FileMetadata {
             is_directory: response.is_directory,
             is_file: response.is_file,
+            is_symlink: response.is_symlink,
             created_at_ms: response.created_at_ms,
             modified_at_ms: response.modified_at_ms,
         })

codex-rs/exec-server/src/server/file_system_handler.rs

@@ -100,6 +100,7 @@ impl FileSystemHandler {
         Ok(FsGetMetadataResponse {
             is_directory: metadata.is_directory,
             is_file: metadata.is_file,
+            is_symlink: metadata.is_symlink,
             created_at_ms: metadata.created_at_ms,
             modified_at_ms: metadata.modified_at_ms,
         })