remote: validate refspecs before adding to config

When we moved from acting on the instance to acting on the
configuration, we dropped the validation of the passed refspec, which
can lead to writing an invalid refspec to the configuration. Bring that
validation back.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/remote.c b/src/remote.c
index d58927f28..99b5bacc0 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -97,6 +97,7 @@ static int write_add_refspec(git_repository *repo, const char *name, const char
 {
 	git_config *cfg;
 	git_buf var = GIT_BUF_INIT;
+	git_refspec spec;
 	const char *fmt;
 	int error;
 
@@ -108,6 +109,15 @@ static int write_add_refspec(git_repository *repo, const char *name, const char
 	if ((error = ensure_remote_name_is_valid(name)) < 0)
 		return error;
 
+	if ((error = git_refspec__parse(&spec, refspec, fetch)) < 0) {
+		if (giterr_last()->klass != GITERR_NOMEMORY)
+			error = GIT_EINVALIDSPEC;
+
+		return error;
+	}
+
+	git_refspec__free(&spec);
+
 	if ((error = git_buf_printf(&var, fmt, name)) < 0)
 		return error;