thodg/libgit2

diff --git a/include/git2/remote.h b/include/git2/remote.h
index c7eb08c..9339434 100644
--- a/include/git2/remote.h
+++ b/include/git2/remote.h
@@ -54,6 +54,14 @@ GIT_EXTERN(int) git_remote_new(git_remote **out, git_repository *repo, const cha
 GIT_EXTERN(int) git_remote_load(git_remote **out, git_repository *repo, const char *name);
 
 /**
+ * Save a remote to its repository's configuration
+ *
+ * @param remote the remote to save to config
+ * @return GIT_SUCCESS or an error code
+ */
+GIT_EXTERN(int) git_remote_save(const git_remote *remote);
+
+/**
  * Get the remote's name
  *
  * @param remote the remote
@@ -70,6 +78,15 @@ 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 +95,15 @@ 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
diff --git a/src/remote.c b/src/remote.c
index c10c337..993037e 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -96,9 +96,9 @@ int git_remote_new(git_remote **out, git_repository *repo, const char *url, cons
 int git_remote_load(git_remote **out, git_repository *repo, const char *name)
 {
 	git_remote *remote;
-	char *buf = NULL;
+	git_buf buf = GIT_BUF_INIT;
 	const char *val;
-	int ret, error, buf_len;
+	int error;
 	git_config *config;
 
 	assert(out && repo && name);
@@ -123,21 +123,13 @@ int git_remote_load(git_remote **out, git_repository *repo, const char *name)
 		goto cleanup;
 	}
 
-	/* "fetch" is the longest var name we're interested in */
-	buf_len = strlen("remote.") + strlen(".fetch") + strlen(name) + 1;
-	buf = git__malloc(buf_len);
-	if (buf == NULL) {
+	git_buf_printf(&buf, "remote.%s.url", name);
+	if (git_buf_oom(&buf)) {
 		error = GIT_ENOMEM;
 		goto cleanup;
 	}
 
-	ret = p_snprintf(buf, buf_len, "%s.%s.%s", "remote", name, "url");
-	if (ret < 0) {
-		error = git__throw(GIT_EOSERR, "Failed to build config var name");
-		goto cleanup;
-	}
-
-	error = git_config_get_string(config, buf, &val);
+	error = git_config_get_string(config, git_buf_cstr(&buf), &val);
 	if (error < GIT_SUCCESS) {
 		error = git__rethrow(error, "Remote's url doesn't exist");
 		goto cleanup;
@@ -150,25 +142,27 @@ int git_remote_load(git_remote **out, git_repository *repo, const char *name)
 		goto cleanup;
 	}
 
-	ret = p_snprintf(buf, buf_len, "%s.%s.%s", "remote", name, "fetch");
-	if (ret < 0) {
-		error = git__throw(GIT_EOSERR, "Failed to build config var name");
+	git_buf_clear(&buf);
+	git_buf_printf(&buf, "remote.%s.fetch", name);
+	if (git_buf_oom(&buf)) {
+		error = GIT_ENOMEM;
 		goto cleanup;
 	}
 
-	error = parse_remote_refspec(config, &remote->fetch, buf);
+	error = parse_remote_refspec(config, &remote->fetch, git_buf_cstr(&buf));
 	if (error < GIT_SUCCESS) {
 		error = git__rethrow(error, "Failed to get fetch refspec");
 		goto cleanup;
 	}
 
-	ret = p_snprintf(buf, buf_len, "%s.%s.%s", "remote", name, "push");
-	if (ret < 0) {
-		error = git__throw(GIT_EOSERR, "Failed to build config var name");
+	git_buf_clear(&buf);
+	git_buf_printf(&buf, "remote.%s.push", name);
+	if (git_buf_oom(&buf)) {
+		error = GIT_ENOMEM;
 		goto cleanup;
 	}
 
-	error = parse_remote_refspec(config, &remote->push, buf);
+	error = parse_remote_refspec(config, &remote->push, git_buf_cstr(&buf));
 	/* Not finding push is fine */
 	if (error == GIT_ENOTFOUND)
 		error = GIT_SUCCESS;
@@ -179,7 +173,7 @@ int git_remote_load(git_remote **out, git_repository *repo, const char *name)
 	*out = remote;
 
 cleanup:
-	git__free(buf);
+	git_buf_free(&buf);
 
 	if (error < GIT_SUCCESS)
 		git_remote_free(remote);
@@ -187,6 +181,56 @@ cleanup:
 	return error;
 }
 
+int git_remote_save(const git_remote *remote)
+{
+	int error;
+	git_config *config;
+	git_buf buf = GIT_BUF_INIT, value = GIT_BUF_INIT;
+
+	error = git_repository_config__weakptr(&config, remote->repo);
+	if (error < GIT_SUCCESS)
+		return error;
+
+	git_buf_printf(&buf, "remote.%s.%s", remote->name, "url");
+	if (git_buf_oom(&buf))
+		return GIT_ENOMEM;
+
+	error = git_config_set_string(config, git_buf_cstr(&buf), remote->url);
+	if (error < GIT_SUCCESS)
+		goto cleanup;
+
+	if (remote->fetch.src != NULL && remote->fetch.src != NULL) {
+		git_buf_clear(&buf);
+		git_buf_clear(&value);
+		git_buf_printf(&buf, "remote.%s.%s", remote->name, "fetch");
+		git_buf_printf(&value, "%s:%s", remote->fetch.src, remote->fetch.dst);
+		if (git_buf_oom(&buf) || git_buf_oom(&value))
+			return GIT_ENOMEM;
+
+		error = git_config_set_string(config, git_buf_cstr(&buf), git_buf_cstr(&value));
+		if (error < GIT_SUCCESS)
+			goto cleanup;
+	}
+
+	if (remote->push.src != NULL && remote->push.src != NULL) {
+		git_buf_clear(&buf);
+		git_buf_clear(&value);
+		git_buf_printf(&buf, "remote.%s.%s", remote->name, "push");
+		git_buf_printf(&value, "%s:%s", remote->push.src, remote->push.dst);
+		if (git_buf_oom(&buf) || git_buf_oom(&value))
+			return GIT_ENOMEM;
+
+		error = git_config_set_string(config, git_buf_cstr(&buf), git_buf_cstr(&value));
+		if (error < GIT_SUCCESS)
+			goto cleanup;
+	}
+
+cleanup:
+	git_buf_free(&buf);
+	git_buf_free(&value);
+	return error;
+}
+
 const char *git_remote_name(git_remote *remote)
 {
 	assert(remote);
@@ -199,12 +243,50 @@ 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);
diff --git a/tests-clar/network/remotes.c b/tests-clar/network/remotes.c
index f3a45d6..beb0bcc 100644
--- a/tests-clar/network/remotes.c
+++ b/tests-clar/network/remotes.c
@@ -36,6 +36,48 @@ 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__save(void)
+{
+	git_remote_free(_remote);
+
+	/* Set up the remote and save it to config */
+	cl_git_pass(git_remote_new(&_remote, _repo, "git://github.com/libgit2/libgit2", "upstream"));
+	cl_git_pass(git_remote_set_fetchspec(_remote, "refs/heads/*:refs/remotes/upstream/*"));
+	cl_git_pass(git_remote_set_pushspec(_remote, "refs/heads/*:refs/heads/*"));
+	cl_git_pass(git_remote_save(_remote));
+	git_remote_free(_remote);
+	_remote = NULL;
+
+	/* Load it from config and make sure everything matches */
+	cl_git_pass(git_remote_load(&_remote, _repo, "upstream"));
+
+	_refspec = git_remote_fetchspec(_remote);
+	cl_assert(_refspec != NULL);
+	cl_assert(!strcmp(git_refspec_src(_refspec), "refs/heads/*"));
+	cl_assert(!strcmp(git_refspec_dst(_refspec), "refs/remotes/upstream/*"));
+
+	_refspec = git_remote_pushspec(_remote);
+	cl_assert(_refspec != NULL);
+	cl_assert(!strcmp(git_refspec_src(_refspec), "refs/heads/*"));
+	cl_assert(!strcmp(git_refspec_dst(_refspec), "refs/heads/*"));
+}
+
 void test_network_remotes__fnmatch(void)
 {
 	cl_git_pass(git_refspec_src_match(_refspec, "refs/heads/master"));