Merge pull request #5299 from pks-t/pks/config-mem-snapshots

config_mem: implement support for snapshots

src/config_mem.c

@@ -170,14 +170,6 @@ static int config_memory_unlock(git_config_backend *backend, int success)
 	return config_error_readonly();
 }
 
-static int config_memory_snapshot(git_config_backend **out, git_config_backend *backend)
-{
-	GIT_UNUSED(out);
-	GIT_UNUSED(backend);
-	git_error_set(GIT_ERROR_CONFIG, "this backend does not support snapshots");
-	return -1;
-}
-
 static void config_memory_free(git_config_backend *_backend)
 {
 	config_memory_backend *backend = (config_memory_backend *)_backend;
@@ -219,7 +211,7 @@ int git_config_backend_from_string(git_config_backend **out, const char *cfg, si
 	backend->parent.iterator = config_memory_iterator;
 	backend->parent.lock = config_memory_lock;
 	backend->parent.unlock = config_memory_unlock;
-	backend->parent.snapshot = config_memory_snapshot;
+	backend->parent.snapshot = git_config_backend_snapshot;
 	backend->parent.free = config_memory_free;
 
 	*out = (git_config_backend *)backend;

tests/config/snapshot.c

 #include "clar_libgit2.h"
 
+#include "config_backend.h"
+
 static git_config *cfg;
 static git_config *snapshot;
 
@@ -120,3 +122,18 @@ void test_config_snapshot__snapshot(void)
 
 	cl_git_pass(p_unlink("configfile"));
 }
+
+void test_config_snapshot__snapshot_from_in_memony(void)
+{
+	const char *configuration = "[section]\nkey = 1\n";
+	git_config_backend *backend;
+	int i;
+
+	cl_git_pass(git_config_new(&cfg));
+	cl_git_pass(git_config_backend_from_string(&backend, configuration, strlen(configuration)));
+	cl_git_pass(git_config_add_backend(cfg, backend, 0, NULL, 0));
+
+	cl_git_pass(git_config_snapshot(&snapshot, cfg));
+	cl_git_pass(git_config_get_int32(&i, snapshot, "section.key"));
+	cl_assert_equal_i(i, 1);
+}