From 5d28a0032282970788f723910f40a67e402d2e09 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Mon, 19 Aug 2024 16:33:23 +0300
Subject: [PATCH] Add nix_store_copy_closure to libstore-c

---
 src/libstore-c/nix_api_store.cc | 12 ++++++++++++
 src/libstore-c/nix_api_store.h  | 10 ++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/libstore-c/nix_api_store.cc b/src/libstore-c/nix_api_store.cc
index 79841ca49..fb7391276 100644
--- a/src/libstore-c/nix_api_store.cc
+++ b/src/libstore-c/nix_api_store.cc
@@ -144,3 +144,15 @@ StorePath * nix_store_path_clone(const StorePath * p)
 {
     return new StorePath{p->path};
 }
+
+nix_err nix_store_copy_closure(nix_c_context * context, Store * srcStore, Store * dstStore, StorePath * path)
+{
+    if (context)
+        context->last_err_code = NIX_OK;
+    try {
+        nix::RealisedPath::Set paths;
+        paths.insert(path->path);
+        nix::copyClosure(*srcStore->ptr, *dstStore->ptr, paths);
+    }
+    NIXC_CATCH_ERRS
+}
diff --git a/src/libstore-c/nix_api_store.h b/src/libstore-c/nix_api_store.h
index 4b2134457..93208cb7c 100644
--- a/src/libstore-c/nix_api_store.h
+++ b/src/libstore-c/nix_api_store.h
@@ -161,6 +161,16 @@ nix_err nix_store_realise(
 nix_err
 nix_store_get_version(nix_c_context * context, Store * store, nix_get_string_callback callback, void * user_data);
 
+/**
+ * @brief Copy the closure of `path` from `srcStore` to `dstStore`.
+ *
+ * @param[out] context Optional, stores error information
+ * @param[in] srcStore nix source store reference
+ * @param[in] srcStore nix destination store reference
+ * @param[in] path Path to copy
+ */
+nix_err nix_store_copy_closure(nix_c_context * context, Store * srcStore, Store * dstStore, StorePath * path);
+
 // cffi end
 #ifdef __cplusplus
 }