thodg/libgit2

diff --git a/examples/network/clone.c b/examples/network/clone.c
index f553c40..db35bd7 100644
--- a/examples/network/clone.c
+++ b/examples/network/clone.c
@@ -57,7 +57,6 @@ int do_clone(git_repository *repo, int argc, char **argv)
 	git_repository *cloned_repo = NULL;
 	git_clone_options clone_opts = GIT_CLONE_OPTIONS_INIT;
 	git_checkout_opts checkout_opts = GIT_CHECKOUT_OPTS_INIT;
-	git_remote_callbacks callbacks = GIT_REMOTE_CALLBACKS_INIT;
 	const char *url = argv[1];
 	const char *path = argv[2];
 	int error;
@@ -75,10 +74,9 @@ int do_clone(git_repository *repo, int argc, char **argv)
 	checkout_opts.progress_cb = checkout_progress;
 	checkout_opts.progress_payload = &pd;
 	clone_opts.checkout_opts = checkout_opts;
-	callbacks.transfer_progress = &fetch_progress;
-	callbacks.credentials = cred_acquire_cb;
-	callbacks.payload = &pd;
-	clone_opts.remote_callbacks = &callbacks;
+	clone_opts.remote_callbacks.transfer_progress = &fetch_progress;
+	clone_opts.remote_callbacks.credentials = cred_acquire_cb;
+	clone_opts.remote_callbacks.payload = &pd;
 
 	// Do the clone
 	error = git_clone(&cloned_repo, url, path, &clone_opts);
diff --git a/include/git2/clone.h b/include/git2/clone.h
index a341a41..331cf92 100644
--- a/include/git2/clone.h
+++ b/include/git2/clone.h
@@ -49,7 +49,7 @@ typedef struct git_clone_options {
 	unsigned int version;
 
 	git_checkout_opts checkout_opts;
-	git_remote_callbacks *remote_callbacks;
+	git_remote_callbacks remote_callbacks;
 
 	int bare;
 	int ignore_cert_errors;
@@ -58,7 +58,7 @@ typedef struct git_clone_options {
 } git_clone_options;
 
 #define GIT_CLONE_OPTIONS_VERSION 1
-#define GIT_CLONE_OPTIONS_INIT {GIT_CLONE_OPTIONS_VERSION, {GIT_CHECKOUT_OPTS_VERSION, GIT_CHECKOUT_SAFE_CREATE}}
+#define GIT_CLONE_OPTIONS_INIT {GIT_CLONE_OPTIONS_VERSION, {GIT_CHECKOUT_OPTS_VERSION, GIT_CHECKOUT_SAFE_CREATE}, GIT_REMOTE_CALLBACKS_INIT}
 
 /**
  * Clone a remote repository.
diff --git a/include/git2/remote.h b/include/git2/remote.h
index 8145de1..9858634 100644
--- a/include/git2/remote.h
+++ b/include/git2/remote.h
@@ -457,7 +457,7 @@ struct git_remote_callbacks {
  * @param callbacks a pointer to the user's callback settings
  * @return 0 or an error code
  */
-GIT_EXTERN(int) git_remote_set_callbacks(git_remote *remote, git_remote_callbacks *callbacks);
+GIT_EXTERN(int) git_remote_set_callbacks(git_remote *remote, const git_remote_callbacks *callbacks);
 
 /**
  * Get the statistics structure that is filled in by the fetch operation.
diff --git a/src/clone.c b/src/clone.c
index 1af6e39..f3e365c 100644
--- a/src/clone.c
+++ b/src/clone.c
@@ -315,8 +315,7 @@ static int create_and_configure_origin(
 	if (options->ignore_cert_errors)
 		git_remote_check_cert(origin, 0);
 
-	if (options->remote_callbacks &&
-	    (error = git_remote_set_callbacks(origin, options->remote_callbacks)) < 0)
+	if ((error = git_remote_set_callbacks(origin, &options->remote_callbacks)) < 0)
 		goto on_error;
 
 	if ((error = git_remote_save(origin)) < 0)
diff --git a/src/remote.c b/src/remote.c
index ace8865..ccedf23 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -1153,7 +1153,7 @@ void git_remote_check_cert(git_remote *remote, int check)
 	remote->check_cert = check;
 }
 
-int git_remote_set_callbacks(git_remote *remote, git_remote_callbacks *callbacks)
+int git_remote_set_callbacks(git_remote *remote, const git_remote_callbacks *callbacks)
 {
 	assert(remote && callbacks);
 
@@ -1162,7 +1162,7 @@ int git_remote_set_callbacks(git_remote *remote, git_remote_callbacks *callbacks
 	memcpy(&remote->callbacks, callbacks, sizeof(git_remote_callbacks));
 
 	if (remote->transport && remote->transport->set_callbacks)
-		remote->transport->set_callbacks(remote->transport,
+		return remote->transport->set_callbacks(remote->transport,
 			remote->callbacks.progress,
 			NULL,
 			remote->callbacks.payload);
diff --git a/tests-clar/clone/empty.c b/tests-clar/clone/empty.c
index d9dc24f..6d19244 100644
--- a/tests-clar/clone/empty.c
+++ b/tests-clar/clone/empty.c
@@ -10,12 +10,14 @@ static git_repository *g_repo_cloned;
 void test_clone_empty__initialize(void)
 {
 	git_repository *sandbox = cl_git_sandbox_init("empty_bare.git");
+	git_remote_callbacks dummy_callbacks = GIT_REMOTE_CALLBACKS_INIT;
 	cl_git_remove_placeholders(git_repository_path(sandbox), "dummy-marker.txt");
 
 	g_repo = NULL;
 
 	memset(&g_options, 0, sizeof(git_clone_options));
 	g_options.version = GIT_CLONE_OPTIONS_VERSION;
+	g_options.remote_callbacks = dummy_callbacks;
 }
 
 void test_clone_empty__cleanup(void)
diff --git a/tests-clar/clone/nonetwork.c b/tests-clar/clone/nonetwork.c
index 9b666b3..4bcb5be 100644
--- a/tests-clar/clone/nonetwork.c
+++ b/tests-clar/clone/nonetwork.c
@@ -15,6 +15,7 @@ static git_remote* g_remote;
 void test_clone_nonetwork__initialize(void)
 {
 	git_checkout_opts dummy_opts = GIT_CHECKOUT_OPTS_INIT;
+	git_remote_callbacks dummy_callbacks = GIT_REMOTE_CALLBACKS_INIT;
 
 	g_repo = NULL;
 
@@ -22,6 +23,7 @@ void test_clone_nonetwork__initialize(void)
 	g_options.version = GIT_CLONE_OPTIONS_VERSION;
 	g_options.checkout_opts = dummy_opts;
 	g_options.checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE;
+	g_options.remote_callbacks = dummy_callbacks;
 }
 
 void test_clone_nonetwork__cleanup(void)
diff --git a/tests-clar/online/clone.c b/tests-clar/online/clone.c
index 9a64ba1..4a6ade5 100644
--- a/tests-clar/online/clone.c
+++ b/tests-clar/online/clone.c
@@ -18,6 +18,7 @@ static git_clone_options g_options;
 void test_online_clone__initialize(void)
 {
 	git_checkout_opts dummy_opts = GIT_CHECKOUT_OPTS_INIT;
+	git_remote_callbacks dummy_callbacks = GIT_REMOTE_CALLBACKS_INIT;
 
 	g_repo = NULL;
 
@@ -25,6 +26,7 @@ void test_online_clone__initialize(void)
 	g_options.version = GIT_CLONE_OPTIONS_VERSION;
 	g_options.checkout_opts = dummy_opts;
 	g_options.checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE;
+	g_options.remote_callbacks = dummy_callbacks;
 }
 
 void test_online_clone__cleanup(void)
@@ -100,15 +102,11 @@ void test_online_clone__can_checkout_a_cloned_repo(void)
 	bool checkout_progress_cb_was_called = false,
 		  fetch_progress_cb_was_called = false;
 
-	git_remote_callbacks callbacks = GIT_REMOTE_CALLBACKS_INIT;
-
 	g_options.checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE_CREATE;
 	g_options.checkout_opts.progress_cb = &checkout_progress;
 	g_options.checkout_opts.progress_payload = &checkout_progress_cb_was_called;
-
-	callbacks.transfer_progress = &fetch_progress;
-	callbacks.payload = &fetch_progress_cb_was_called;
-	g_options.remote_callbacks = &callbacks;
+	g_options.remote_callbacks.transfer_progress = &fetch_progress;
+	g_options.remote_callbacks.payload = &fetch_progress_cb_was_called;
 
 	cl_git_pass(git_clone(&g_repo, LIVE_REPO_URL, "./foo", &g_options));
 
@@ -175,12 +173,10 @@ static int update_tips(const char *refname, const git_oid *a, const git_oid *b, 
 
 void test_online_clone__custom_remote_callbacks(void)
 {
-	git_remote_callbacks remote_callbacks = GIT_REMOTE_CALLBACKS_INIT;
 	int callcount = 0;
 
-	g_options.remote_callbacks = &remote_callbacks;
-	remote_callbacks.update_tips = update_tips;
-	remote_callbacks.payload = &callcount;
+	g_options.remote_callbacks.update_tips = update_tips;
+	g_options.remote_callbacks.payload = &callcount;
 
 	cl_git_pass(git_clone(&g_repo, LIVE_REPO_URL, "./foo", &g_options));
 	cl_assert(callcount > 0);
@@ -194,13 +190,11 @@ void test_online_clone__credentials(void)
 		cl_getenv("GITTEST_REMOTE_USER"),
 		cl_getenv("GITTEST_REMOTE_PASS")
 	};
-	git_remote_callbacks callbacks = GIT_REMOTE_CALLBACKS_INIT;
 
 	if (!remote_url) return;
 
-	callbacks.credentials = git_cred_userpass;
-	callbacks.payload = &user_pass;
-	g_options.remote_callbacks = &callbacks;
+	g_options.remote_callbacks.credentials = git_cred_userpass;
+	g_options.remote_callbacks.payload = &user_pass;
 
 	cl_git_pass(git_clone(&g_repo, remote_url, "./foo", &g_options));
 	git_repository_free(g_repo); g_repo = NULL;
@@ -213,11 +207,8 @@ void test_online_clone__bitbucket_style(void)
 		"libgit2", "libgit2"
 	};
 
-	git_remote_callbacks callbacks = GIT_REMOTE_CALLBACKS_INIT;
-
-	callbacks.credentials = git_cred_userpass;
-	callbacks.payload = &user_pass;
-	g_options.remote_callbacks = &callbacks;
+	g_options.remote_callbacks.credentials = git_cred_userpass;
+	g_options.remote_callbacks.payload = &user_pass;
 
 	cl_git_pass(git_clone(&g_repo, BB_REPO_URL, "./foo", &g_options));
 	git_repository_free(g_repo); g_repo = NULL;
@@ -247,10 +238,7 @@ static int cancel_at_half(const git_transfer_progress *stats, void *payload)
 
 void test_online_clone__can_cancel(void)
 {
-	git_remote_callbacks callbacks = GIT_REMOTE_CALLBACKS_INIT;
-
-	callbacks.transfer_progress = cancel_at_half;
-	g_options.remote_callbacks = &callbacks;
+	g_options.remote_callbacks.transfer_progress = cancel_at_half;
 
 	cl_git_fail_with(git_clone(&g_repo, LIVE_REPO_URL, "./foo", &g_options), GIT_EUSER);
 }
diff --git a/tests-clar/online/fetchhead.c b/tests-clar/online/fetchhead.c
index 5d9eb13..57b183f 100644
--- a/tests-clar/online/fetchhead.c
+++ b/tests-clar/online/fetchhead.c
@@ -12,10 +12,12 @@ static git_clone_options g_options;
 
 void test_online_fetchhead__initialize(void)
 {
+	git_remote_callbacks dummy_callbacks = GIT_REMOTE_CALLBACKS_INIT;
 	g_repo = NULL;
 
 	memset(&g_options, 0, sizeof(git_clone_options));
 	g_options.version = GIT_CLONE_OPTIONS_VERSION;
+	g_options.remote_callbacks = dummy_callbacks;
 }
 
 void test_online_fetchhead__cleanup(void)