*: add mixin tests to CI

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

.circleci/config.yml

@@ -31,6 +31,26 @@ jobs:
     - run: sudo pip install codespell
     - run: codespell --skip=".git,./vendor,ttar,go.mod,go.sum,*pem,./collector/fixtures" -L uint,packages\',uptodate
 
+  test_mixins:
+    executor: golang
+    steps:
+    - checkout
+    - run:
+        command: go install -mod=readonly github.com/google/go-jsonnet/cmd/jsonnet github.com/google/go-jsonnet/cmd/jsonnetfmt github.com/jsonnet-bundler/jsonnet-bundler/cmd/jb github.com/prometheus/prometheus/cmd/promtool
+        working_directory: ~/project/docs/node-mixin
+    - run:
+        command: make clean
+        working_directory: ~/project/docs/node-mixin
+    - run:
+        command: jb install
+        working_directory: ~/project/docs/node-mixin
+    - run:
+        command: make
+        working_directory: ~/project/docs/node-mixin
+    - run:
+        command: git diff --exit-code
+        working_directory: ~/project/docs/node-mixin
+
   build:
     machine:
       image: ubuntu-1604:201903-01
@@ -85,6 +105,10 @@ workflows:
         filters:
           tags:
             only: /.*/
+    - test_mixins:
+        filters:
+          tags:
+            only: /.*/
     - prometheus/publish_master:
         context: org-context
         requires:

docs/node-mixin/go.mod

@@ -0,0 +1,9 @@
+module github.com/prometheus/node_exporter/docs/node-mixin
+
+go 1.15
+
+require (
+	github.com/google/go-jsonnet v0.16.0
+	github.com/jsonnet-bundler/jsonnet-bundler v0.4.0
+	github.com/prometheus/prometheus v1.8.2-0.20200805170718-983ebb4a5133
+)

docs/node-mixin/jsonnetfile.json

@@ -1,34 +1,33 @@
 {
+  "version": 1,
   "dependencies": [
     {
-            "name": "grafonnet",
       "source": {
         "git": {
-                    "remote": "https://github.com/grafana/grafonnet-lib",
+          "remote": "https://github.com/grafana/grafonnet-lib.git",
           "subdir": "grafonnet"
         }
       },
       "version": "master"
     },
     {
-            "name": "grafana-builder",
       "source": {
         "git": {
-                    "remote": "https://github.com/grafana/jsonnet-libs",
+          "remote": "https://github.com/grafana/jsonnet-libs.git",
           "subdir": "grafana-builder"
         }
       },
       "version": "master"
     },
     {
-            "name": "promgrafonnet",
       "source": {
         "git": {
-                    "remote": "https://github.com/kubernetes-monitoring/kubernetes-mixin",
+          "remote": "https://github.com/kubernetes-monitoring/kubernetes-mixin.git",
           "subdir": "lib/promgrafonnet"
         }
       },
       "version": "master"
     }
-    ]
+  ],
+  "legacyImports": true
 }

docs/node-mixin/tools.go

@@ -0,0 +1,26 @@
+// Copyright 2020 The prometheus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build tools
+
+// Package tools tracks dependencies for tools that used in the build process.
+// See https://github.com/golang/go/issues/25922
+package tools
+
+import (
+	_ "github.com/google/go-jsonnet/cmd/jsonnet"
+	_ "github.com/google/go-jsonnet/cmd/jsonnetfmt"
+	_ "github.com/jsonnet-bundler/jsonnet-bundler/cmd/jb"
+	_ "github.com/prometheus/prometheus/cmd/promtool"
+)