remote.c: introduce branch_get_upstream helper
All of the information needed to find the @{upstream} of a
branch is included in the branch struct, but callers have to
navigate a series of possible-NULL values to get there.
Let's wrap that logic up in an easy-to-read helper.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/remote.h b/remote.h
index 30a11da..d968952 100644
--- a/remote.h
+++ b/remote.h
@@ -218,6 +218,13 @@
int branch_has_merge_config(struct branch *branch);
int branch_merge_matches(struct branch *, int n, const char *);
+/**
+ * Return the fully-qualified refname of the tracking branch for `branch`.
+ * I.e., what "branch@{upstream}" would give you. Returns NULL if no
+ * upstream is defined.
+ */
+const char *branch_get_upstream(struct branch *branch);
+
/* Flags to match_refs. */
enum match_refs_flags {
MATCH_REFS_NONE = 0,
