thodg/libgit2

diff --git a/include/git2/branch.h b/include/git2/branch.h
index f284100..8887810 100644
--- a/include/git2/branch.h
+++ b/include/git2/branch.h
@@ -260,6 +260,17 @@ GIT_EXTERN(int) git_branch_remote_name(
 	git_repository *repo,
 	const char *canonical_branch_name);
 
+
+/**
+ * Retrieve the name fo the upstream remote of a local branch
+ *
+ * @param buf the buffer into which to write the name
+ * @param repo the repository in which to look
+ * @param refname the full name of the branch
+ * @return 0 or an error code
+ */
+ GIT_EXTERN(int) git_branch_upstream_remote(git_buf *buf, git_repository *repo, const char *refname);
+
 /** @} */
 GIT_END_DECL
 #endif
diff --git a/src/branch.c b/src/branch.c
index 9a3cb07..01402a2 100644
--- a/src/branch.c
+++ b/src/branch.c
@@ -384,6 +384,29 @@ cleanup:
 	return error;
 }
 
+int git_branch_upstream_remote(git_buf *buf, git_repository *repo, const char *refname)
+{
+	int error;
+	const char *str;
+	git_config *cfg;
+
+	if (!git_reference__is_branch(refname))
+		return not_a_local_branch(refname);
+
+	git_buf_sanitize(buf);
+	if ((error = git_repository_config_snapshot(&cfg, repo)) < 0)
+		return error;
+
+	if ((error = retrieve_upstream_configuration(&str, cfg, refname, "branch.%s.remote")) < 0)
+		goto cleanup;
+
+	error = git_buf_puts(buf, str);
+
+cleanup:
+	git_config_free(cfg);
+	return error;
+}
+
 int git_branch_remote_name(git_buf *buf, git_repository *repo, const char *refname)
 {
 	git_strarray remote_list = {0};
diff --git a/src/remote.c b/src/remote.c
index 4b9993d..2206954 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -930,23 +930,50 @@ static int remote_head_for_fetchspec_src(git_remote_head **out, git_vector *upda
 	return 0;
 }
 
+static int ref_to_update(int *update, git_buf *remote_name, git_remote *remote, git_refspec *spec, const char *ref_name)
+{
+	int error = 0;
+	git_repository *repo;
+	git_buf upstream_remote = GIT_BUF_INIT;
+	git_buf upstream_name = GIT_BUF_INIT;
+
+	repo = git_remote_owner(remote);
+
+	if ((!git_reference__is_branch(ref_name)) ||
+	    !git_remote_name(remote) ||
+	    (error = git_branch_upstream_remote(&upstream_remote, repo, ref_name) < 0) ||
+	    git__strcmp(git_remote_name(remote), git_buf_cstr(&upstream_remote)) ||
+	    (error = git_branch_upstream_name(&upstream_name, repo, ref_name)) < 0 ||
+	    !git_refspec_dst_matches(spec, git_buf_cstr(&upstream_name)) ||
+	    (error = git_refspec_rtransform(remote_name, spec, upstream_name.ptr)) < 0) {
+		/* Not an error if there is no upstream */
+		if (error == GIT_ENOTFOUND) {
+			giterr_clear();
+			error = 0;
+		}
+
+		*update = 0;
+	} else {
+		*update = 1;
+	}
+
+	git_buf_free(&upstream_remote);
+	git_buf_free(&upstream_name);
+	return error;
+}
+
 static int remote_head_for_ref(git_remote_head **out, git_remote *remote, git_refspec *spec, git_vector *update_heads, git_reference *ref)
 {
 	git_reference *resolved_ref = NULL;
 	git_buf remote_name = GIT_BUF_INIT;
-	git_buf upstream_name = GIT_BUF_INIT;
-	git_buf config_key = GIT_BUF_INIT;
-	git_repository *repo;
 	git_config *config = NULL;
-	const char *ref_name, *branch_remote;
-	int error = 0;
+	const char *ref_name;
+	int error = 0, update;
 
 	assert(out && spec && ref);
 
 	*out = NULL;
 
-	repo = git_reference_owner(ref);
-
 	error = git_reference_resolve(&resolved_ref, ref);
 
 	/* If we're in an unborn branch, let's pretend nothing happened */
@@ -957,29 +984,14 @@ static int remote_head_for_ref(git_remote_head **out, git_remote *remote, git_re
 		ref_name = git_reference_name(resolved_ref);
 	}
 
-	if ((!git_reference__is_branch(ref_name)) ||
-	    (error = git_repository_config_snapshot(&config, repo)) < 0 ||
-	    (error = git_buf_printf(&config_key, "branch.%s.remote",
-	        ref_name + strlen(GIT_REFS_HEADS_DIR))) < 0 ||
-	    (error = git_config_get_string(&branch_remote, config, git_buf_cstr(&config_key))) < 0 ||
-	    git__strcmp(git_remote_name(remote), branch_remote) ||
-	    (error = git_branch_upstream_name(&upstream_name, repo, ref_name)) < 0 ||
-	    !git_refspec_dst_matches(spec, git_buf_cstr(&upstream_name)) ||
-	    (error = git_refspec_rtransform(&remote_name, spec, upstream_name.ptr)) < 0) {
-		/* Not an error if there is no upstream */
-		if (error == GIT_ENOTFOUND)
-			error = 0;
-
+	if ((error = ref_to_update(&update, &remote_name, remote, spec, ref_name)) < 0)
 		goto cleanup;
-	}
 
-	error = remote_head_for_fetchspec_src(out, update_heads, git_buf_cstr(&remote_name));
+	if (update)
+		error = remote_head_for_fetchspec_src(out, update_heads, git_buf_cstr(&remote_name));
 
 cleanup:
 	git_reference_free(resolved_ref);
-	git_buf_free(&remote_name);
-	git_buf_free(&upstream_name);
-	git_buf_free(&config_key);
 	git_config_free(config);
 	return error;
 }
diff --git a/tests/network/remote/remotes.c b/tests/network/remote/remotes.c
index a5e1ba2..07ad934 100644
--- a/tests/network/remote/remotes.c
+++ b/tests/network/remote/remotes.c
@@ -535,6 +535,16 @@ static int remote_single_branch(git_remote **out, git_repository *repo, const ch
 	return 0;
 }
 
+void test_network_remote_remotes__fetch_from_anonymous(void)
+{
+	git_remote *remote;
+
+	cl_git_pass(git_remote_create_anonymous(&remote, _repo, cl_fixture("testrepo.git"),
+						"refs/heads/*:refs/other/*"));
+	cl_git_pass(git_remote_fetch(remote, NULL, NULL, NULL));
+	git_remote_free(remote);
+}
+
 void test_network_remote_remotes__single_branch(void)
 {
 	git_clone_options opts = GIT_CLONE_OPTIONS_INIT;
diff --git a/tests/refs/branches/upstream.c b/tests/refs/branches/upstream.c
index ce35698..abf7933 100644
--- a/tests/refs/branches/upstream.c
+++ b/tests/refs/branches/upstream.c
@@ -61,6 +61,15 @@ void test_refs_branches_upstream__trying_to_retrieve_a_remote_tracking_reference
 	cl_assert_equal_i(GIT_ENOTFOUND, git_branch_upstream(&upstream, branch));
 }
 
+void test_refs_branches_upstream__upstream_remote(void)
+{
+	git_buf buf = GIT_BUF_INIT;
+
+	cl_git_pass(git_branch_upstream_remote(&buf, repo, "refs/heads/master"));
+	cl_assert_equal_s("test", buf.ptr);
+	git_buf_free(&buf);
+}
+
 static void assert_merge_and_or_remote_key_missing(git_repository *repository, const git_commit *target, const char *entry_name)
 {
 	git_reference *branch;