Add git_remote_update_tips

This function updates the references in the local reference storage to
match the ones in the remote.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

include/git2/remote.h

@@ -141,6 +141,16 @@ GIT_EXTERN(int) git_remote_download(char **filename, git_remote *remote);
  */
 GIT_EXTERN(void) git_remote_free(struct git_remote *remote);
 
+/**
+ * Update the tips to the new state
+ *
+ * Make sure that you only call this once you've successfully indexed
+ * or expanded the packfile.
+ *
+ * @param remote the remote to update
+ */
+GIT_EXTERN(int) git_remote_update_tips(struct git_remote *remote);
+
 /** @} */
 GIT_END_DECL
 #endif

src/remote.c

@@ -31,6 +31,7 @@
 #include "repository.h"
 #include "remote.h"
 #include "fetch.h"
+#include "refs.h"
 
 static int refspec_parse(git_refspec *refspec, const char *str)
 {
@@ -218,6 +219,32 @@ git_headarray *git_remote_tips(git_remote *remote)
 	return &remote->refs;
 }
 
+int git_remote_update_tips(struct git_remote *remote)
+{
+	int error = GIT_SUCCESS;
+	unsigned int i;
+	char refname[GIT_PATH_MAX];
+	git_headarray *refs = &remote->refs;
+	git_remote_head *head;
+	git_reference *ref;
+	struct git_refspec *spec = &remote->fetch;
+
+	memset(refname, 0x0, sizeof(refname));
+
+	for (i = 0; i < refs->len; ++i) {
+		head = refs->heads[i];
+		error = git_refspec_transform(refname, sizeof(refname), spec, head->name);
+		if (error < GIT_SUCCESS)
+			return error;
+
+		error = git_reference_create_oid(&ref, remote->repo, refname, &head->oid, 1);
+		if (error < GIT_SUCCESS)
+			return error;
+	}
+
+	return GIT_SUCCESS;
+}
+
 void git_remote_free(git_remote *remote)
 {
 	free(remote->fetch.src);