Add git_remote_set_{fetch,push}spec()

Allow setting the fetch and push refspecs, which is useful for
creating new refspecs.

include/git2/remote.h

@@ -70,6 +70,15 @@ GIT_EXTERN(const char *) git_remote_name(git_remote *remote);
 GIT_EXTERN(const char *) git_remote_url(git_remote *remote);
 
 /**
+ * Set the remote's fetch refspec
+ *
+ * @param remote the remote
+ * @apram spec the new fetch refspec
+ * @return GIT_SUCCESS or an error value
+ */
+GIT_EXTERN(int) git_remote_set_fetchspec(git_remote *remote, const char *spec);
+
+/**
  * Get the fetch refspec
  *
  * @param remote the remote
@@ -78,6 +87,15 @@ GIT_EXTERN(const char *) git_remote_url(git_remote *remote);
 GIT_EXTERN(const git_refspec *) git_remote_fetchspec(git_remote *remote);
 
 /**
+ * Set the remote's push refspec
+ *
+ * @param remote the remote
+ * @apram spec the new push refspec
+ * @return GIT_SUCCESS or an error value
+ */
+GIT_EXTERN(int) git_remote_set_pushspec(git_remote *remote, const char *spec);
+
+/**
  * Get the push refspec
  *
  * @param remote the remote

src/remote.c

@@ -199,12 +199,50 @@ const char *git_remote_url(git_remote *remote)
 	return remote->url;
 }
 
+int git_remote_set_fetchspec(git_remote *remote, const char *spec)
+{
+	int error;
+	git_refspec refspec;
+
+	assert(remote && spec);
+
+	error = refspec_parse(&refspec, spec);
+	if (error != GIT_SUCCESS)
+		return error;
+
+	git__free(remote->fetch.src);
+	git__free(remote->fetch.dst);
+	remote->fetch.src = refspec.src;
+	remote->fetch.dst = refspec.dst;
+
+	return GIT_SUCCESS;
+}
+
 const git_refspec *git_remote_fetchspec(git_remote *remote)
 {
 	assert(remote);
 	return &remote->fetch;
 }
 
+int git_remote_set_pushspec(git_remote *remote, const char *spec)
+{
+	int error;
+	git_refspec refspec;
+
+	assert(remote && spec);
+
+	error = refspec_parse(&refspec, spec);
+	if (error != GIT_SUCCESS)
+		return error;
+
+	git__free(remote->push.src);
+	git__free(remote->push.dst);
+	remote->push.src = refspec.src;
+	remote->push.dst = refspec.dst;
+
+	return GIT_SUCCESS;
+}
+
 const git_refspec *git_remote_pushspec(git_remote *remote)
 {
 	assert(remote);

tests-clar/network/remotes.c

@@ -36,6 +36,22 @@ void test_network_remotes__refspec_parsing(void)
 	cl_assert(!strcmp(git_refspec_dst(_refspec), "refs/remotes/test/*"));
 }
 
+void test_network_remotes__set_fetchspec(void)
+{
+	cl_git_pass(git_remote_set_fetchspec(_remote, "refs/*:refs/*"));
+	_refspec = git_remote_fetchspec(_remote);
+	cl_assert(!strcmp(git_refspec_src(_refspec), "refs/*"));
+	cl_assert(!strcmp(git_refspec_dst(_refspec), "refs/*"));
+}
+
+void test_network_remotes__set_pushspec(void)
+{
+	cl_git_pass(git_remote_set_pushspec(_remote, "refs/*:refs/*"));
+	_refspec = git_remote_pushspec(_remote);
+	cl_assert(!strcmp(git_refspec_src(_refspec), "refs/*"));
+	cl_assert(!strcmp(git_refspec_dst(_refspec), "refs/*"));
+}
+
 void test_network_remotes__fnmatch(void)
 {
 	cl_git_pass(git_refspec_src_match(_refspec, "refs/heads/master"));