Merge branch 'jc/checkout-local-track-report'

The report from "git checkout" on a branch that builds on another
local branch by setting its branch.*.merge to branch name (not a
full refname) incorrectly said that the upstream is gone.

* jc/checkout-local-track-report:
  checkout: report upstream correctly even with loosely defined branch.*.merge

2 files changed, 41 insertions, 11 deletions

diff --git a/remote.c b/remote.c
index ae4ecfa116..5b9c6931c1 100644
--- a/remote.c
+++ b/remote.c
@@ -1631,6 +1631,27 @@ void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
 	}
 }
 
+static void set_merge(struct branch *ret)
+{
+	char *ref;
+	unsigned char sha1[20];
+	int i;
+
+	ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
+	for (i = 0; i < ret->merge_nr; i++) {
+		ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
+		ret->merge[i]->src = xstrdup(ret->merge_name[i]);
+		if (!remote_find_tracking(ret->remote, ret->merge[i]) ||
+		    strcmp(ret->remote_name, "."))
+			continue;
+		if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
+			     sha1, &ref) == 1)
+			ret->merge[i]->dst = ref;
+		else
+			ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
+	}
+}
+
 struct branch *branch_get(const char *name)
 {
 	struct branch *ret;
@@ -1642,17 +1663,8 @@ struct branch *branch_get(const char *name)
 		ret = make_branch(name, 0);
 	if (ret && ret->remote_name) {
 		ret->remote = remote_get(ret->remote_name);
-		if (ret->merge_nr) {
-			int i;
-			ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
-			for (i = 0; i < ret->merge_nr; i++) {
-				ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
-				ret->merge[i]->src = xstrdup(ret->merge_name[i]);
-				if (remote_find_tracking(ret->remote, ret->merge[i])
-				    && !strcmp(ret->remote_name, "."))
-					ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
-			}
-		}
+		if (ret->merge_nr)
+			set_merge(ret);
 	}
 	return ret;
 }
diff --git a/t/t2024-checkout-dwim.sh b/t/t2024-checkout-dwim.sh
index 6ecb559465..468a000e4b 100755
--- a/t/t2024-checkout-dwim.sh
+++ b/t/t2024-checkout-dwim.sh
@@ -185,4 +185,22 @@ test_expect_success 'checkout <branch> -- succeeds, even if a file with the same
 	test_branch_upstream spam repo_c spam
 '
 
+test_expect_success 'loosely defined local base branch is reported correctly' '
+
+	git checkout master &&
+	git branch strict &&
+	git branch loose &&
+	git commit --allow-empty -m "a bit more" &&
+
+	test_config branch.strict.remote . &&
+	test_config branch.loose.remote . &&
+	test_config branch.strict.merge refs/heads/master &&
+	test_config branch.loose.merge master &&
+
+	git checkout strict | sed -e "s/strict/BRANCHNAME/g" >expect &&
+	git checkout loose | sed -e "s/loose/BRANCHNAME/g" >actual &&
+
+	test_cmp expect actual
+'
+
 test_done