ci: print the buildifier command when BUILD lint fails (#20882)

PR Close #20882

.circleci/config.yml

@@ -11,7 +11,11 @@
 anchor_1: &job_defaults
   working_directory: ~/ng
   docker:
+    ## IMPORTANT
+    # If you change this, also change the version of com_github_bazelbuild_buildtools
+    # in the /WORKSPACE file
     - image: angular/ngcontainer:0.0.7
+    ## IMPORTANT
 
 # After checkout, rebase on top of master.
 # Similar to travis behavior, but not quite the same.
@@ -28,8 +32,8 @@ jobs:
           <<: *post_checkout
       # Check BUILD.bazel formatting before we have a node_modules directory
       # Then we don't need any exclude pattern to avoid checking those files
-      - run: buildifier -mode=diff $(find . -iname BUILD.bazel -type f)
-      - run: buildifier -mode=check $(find . -iname BUILD.bazel -type f)
+      - run: 'buildifier -mode=check $(find . -type f \( -name BUILD.bazel -or -name BUILD \)) ||
+              (echo "BUILD files not formatted. Please run ''yarn buildifier''" ; exit 1)'
 
       - restore_cache:
           key: angular-{{ .Branch }}-{{ checksum "yarn.lock" }}

WORKSPACE

@@ -31,3 +31,24 @@ local_repository(
     name = "rxjs",
     path = "node_modules/rxjs/src",
 )
+
+git_repository(
+    name = "com_github_bazelbuild_buildtools",
+    remote = "https://github.com/bazelbuild/buildtools.git",
+    # Note, this commit matches the version of buildifier in angular/ngcontainer
+    # If you change this, also check if it matches the version in the angular/ngcontainer
+    # version in /.circleci/config.yml
+    commit = "b3b620e8bcff18ed3378cd3f35ebeb7016d71f71",
+)
+
+http_archive(
+    name = "io_bazel_rules_go",
+    url = "https://github.com/bazelbuild/rules_go/releases/download/0.7.1/rules_go-0.7.1.tar.gz",
+    sha256 = "341d5eacef704415386974bc82a1783a8b7ffbff2ab6ba02375e1ca20d9b031c",
+)
+
+load("@io_bazel_rules_go//go:def.bzl", "go_rules_dependencies", "go_register_toolchains")
+
+go_rules_dependencies()
+
+go_register_toolchains()

package.json

@@ -16,6 +16,7 @@
     "url": "https://github.com/angular/angular.git"
   },
   "scripts": {
+    "buildifier": "bazel build @com_github_bazelbuild_buildtools//buildifier && find . -type f \\( -name BUILD -or -name BUILD.bazel \\) ! -path \"*/node_modules/*\" | xargs $(bazel info bazel-bin)/external/com_github_bazelbuild_buildtools/buildifier/buildifier",
     "preinstall": "node -e \"if(process.env.npm_execpath.indexOf('yarn') === -1) throw new Error('Please use Yarn instead of NPM to install dependencies. See: https://yarnpkg.com/lang/en/docs/install/')\"",
     "postinstall": "webdriver-manager update --gecko false",
     "check-env": "gulp check-env"