From dadd5f1f1151f7d3da6028ae5ba553abcc60664a Mon Sep 17 00:00:00 2001
From: Ricky Stewart <ricky@cockroachlabs.com>
Date: Tue, 12 Jan 2021 17:18:16 -0600
Subject: [PATCH] build: assert minimum bazel version in use

Use `bazel_skylib`'s built-in functionality to assert the minimum
supported Bazel version. We could also use `.bazelversion` to specify an
*exact* version that must be used, but that seems unnecessarily
restrictive.

v3.5.0 was arbitrarily chosen as being probably "recent enough", but I
did verify that a build does work with that version of Bazel.

Fixes #56059.

Release note: None
---
 WORKSPACE | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/WORKSPACE b/WORKSPACE
index 5a095c4b2d82..6632c2e71644 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -74,6 +74,11 @@ go_rules_dependencies()
 
 go_register_toolchains(go_version = "1.15.6")
 
+# NB: @bazel_skylib comes from go_rules_dependencies().
+load("@bazel_skylib//lib:versions.bzl", "versions")
+
+versions.check(minimum_bazel_version = "3.5.0")
+
 # Load gazelle dependencies.
 load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")