feat(yamllint): include for this repo and apply rules throughout

* Semi-automated using `ssf-formula` (v0.5.0)
* Fix errors shown below:

```bash
prometheus-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
./prometheus/osfamilymap.yaml
  1:89      error    line too long (116 > 88 characters)  (line-length)
  1:24      error    trailing spaces  (trailing-spaces)
  13:2      error    syntax error: found character '%' that cannot start any token
  24:89     error    line too long (90 > 88 characters)  (line-length)
  25:89     error    line too long (167 > 88 characters)  (line-length)

./prometheus/defaults.yaml
  6:13      error    too many spaces inside braces  (braces)
  6:35      error    too many spaces inside braces  (braces)
  7:11      error    too many spaces inside braces  (braces)
  7:25      error    too many spaces inside braces  (braces)
  8:22      warning  truthy value should be one of [false, true]  (truthy)
  9:25      warning  truthy value should be one of [false, true]  (truthy)
  49:85     error    trailing spaces  (trailing-spaces)
  103:20    warning  truthy value should be one of [false, true]  (truthy)
  104:25    warning  truthy value should be one of [false, true]  (truthy)
  108:16    warning  truthy value should be one of [false, true]  (truthy)
  113:24    warning  missing starting space in comment  (comments)

pillar.example
  31:6      warning  missing starting space in comment  (comments)
  32:8      warning  missing starting space in comment  (comments)
  32:7      warning  comment not indented like content  (comments-indentation)
  51:5      warning  comment not indented like content  (comments-indentation)
  65:89     error    line too long (110 > 88 characters)  (line-length)
  68:29     error    too many spaces after colon  (colons)
  68:34     warning  too few spaces before comment  (comments)
  68:89     error    line too long (106 > 88 characters)  (line-length)
  69:34     warning  too few spaces before comment  (comments)
  69:89     error    line too long (98 > 88 characters)  (line-length)
  75:9      error    wrong indentation: expected 10 but found 8  (indentation)
  76:11     error    wrong indentation: expected 12 but found 10  (indentation)
  77:13     warning  comment not indented like content  (comments-indentation)
  79:89     error    line too long (101 > 88 characters)  (line-length)
  81:9      warning  comment not indented like content  (comments-indentation)
  86:89     error    line too long (103 > 88 characters)  (line-length)
  91:11     error    wrong indentation: expected 12 but found 10  (indentation)
  106:15    error    wrong indentation: expected 16 but found 14  (indentation)
  108:41    warning  too few spaces before comment  (comments)
  118:89    error    line too long (96 > 88 characters)  (line-length)
  139:13    error    wrong indentation: expected 14 but found 12  (indentation)
  143:7     error    wrong indentation: expected 8 but found 6  (indentation)
  145:9     error    wrong indentation: expected 10 but found 8  (indentation)
  157:6     warning  missing starting space in comment  (comments)
  158:20    error    too many spaces inside braces  (braces)
  158:47    error    too many spaces inside braces  (braces)
```

.travis.yml

@@ -3,7 +3,7 @@
 ---
 stages:
   - test
-  - commitlint
+  - lint
   - name: release
     if: branch = master AND type != pull_request
 
@@ -45,16 +45,21 @@ script:
 
 jobs:
   include:
-    # Define the commitlint stage
+    # Define the `lint` stage (runs `yamllint` and `commitlint`)
-    - stage: commitlint
+    - stage: lint
       language: node_js
       node_js: lts/*
       before_install: skip
       script:
+        # Install and run `yamllint`
+        - pip install --user yamllint
+        # yamllint disable-line rule:line-length
+        - yamllint -s . .yamllint pillar.example
+        # Install and run `commitlint`
         - npm install @commitlint/config-conventional -D
         - npm install @commitlint/travis-cli -D
         - commitlint-travis
-    # Define the release stage that runs semantic-release
+    # Define the release stage that runs `semantic-release`
     - stage: release
       language: node_js
       node_js: lts/*

.yamllint

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+# Extend the `default` configuration provided by `yamllint`
+extends: default
+
+# Files to ignore completely
+# 1. All YAML files under directory `node_modules/`, introduced during the Travis run
+ignore: |
+  node_modules/
+
+rules:
+  line-length:
+    # Increase from default of `80`
+    # Based on https://github.com/PyCQA/flake8-bugbear#opinionated-warnings (`B950`)
+    max: 88

pillar.example

@@ -54,19 +54,21 @@ prometheus:
     # dirs:
     #   files: files_alt
     #   default: default_alt
-    # source_files:
+    source_files:
-    #   prometheus-config-file-file-managed:
+      prometheus-config-file-file-managed:
-    #     - 'example_alt.tmpl'
+        - 'alt_config.yml.jinja'
-    #     - 'example_alt.tmpl.jinja'
 
   # Pillar-based config
   config:
     prometheus:
+      # yamllint disable-line rule:line-length
       # ref https://raw.githubusercontent.com/prometheus/prometheus/release-2.10/config/testdata/conf.good.yml
       # my global config
       global:
-        scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+        # Set the scrape interval to every 15 seconds. Default is every 1 minute.
-        evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+        scrape_interval: 15s
+        # Evaluate rules every 15 seconds. The default is every 1 minute.
+        evaluation_interval: 15s
         # scrape_timeout is set to the global default (10s).
 
       # Alertmanager configuration
@@ -76,14 +78,16 @@ prometheus:
               - targets:
               #     - alertmanager:9093
 
-      # Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+      # Load rules once and periodically evaluate them according to the global
+      # 'evaluation_interval'.
       rule_files:
-        # - "first_rules.yml"
+        - "first_rules.yml"
         # - "second_rules.yml"
 
       # A scrape configuration containing exactly one endpoint to scrape:
       scrape_configs:
-        # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+        # The job name is added as a label `job=<job_name>` to any timeseries
+        # scraped from this config.
         - job_name: 'prometheus'
           # metrics_path defaults to '/metrics'
           # scheme defaults to 'http'.
@@ -115,6 +119,7 @@ prometheus:
               replacement: 127.0.0.1:9115  # The blackbox exporter's real hostname:port.
 
     alertmanager:
+      # yamllint disable-line rule:line-length
       # ref https://github.com/prometheus/alertmanager/blob/master/config/testdata/conf.good.yml
       global:
         smtp_smarthost: 'localhost:25'
@@ -155,4 +160,5 @@ prometheus:
 
   linux:
     # 'Alternatives system' priority: zero disables (default)
+    # yamllint disable-line rule:braces
     altpriority: {{ range(1, 9100000) | random }}

prometheus/defaults.yaml

@@ -3,10 +3,12 @@
 ---
 prometheus:
   rootgroup: root
+  # yamllint disable rule:braces
   kernel: {{ grains.kernel | lower }}
   arch: {{ grains.osarch }}
-  use_upstream_repo: False
+  # yamllint enable rule:braces
-  use_upstream_archive: False
+  use_upstream_repo: false
+  use_upstream_archive: false
 
   wanted:
     - prometheus
@@ -100,12 +102,12 @@ prometheus:
     uri: https://github.com/prometheus
     suffix: tar.gz
     kwargs:
-      trim_output: True
+      trim_output: true
-      enforce_toplevel: True
+      enforce_toplevel: true
       archive_format: tar
       retry:
         attempts: 3
-        until: True
+        until: true
         interval: 60
         splay: 10
 

prometheus/map.jinja

@@ -21,6 +21,14 @@
 {#- Merge the prometheus pillar #}
 {%- set prometheus = salt['pillar.get']('prometheus', default=defaults, merge=True) %}
 
+{#- Post-processing for specific non-YAML customisations #}
+{%- if grains.os == 'MacOS' %}
+{%-   set macos_user = salt['cmd.run']("stat -f '%Su' /dev/console") %}
+{%-   set macos_group = salt['cmd.run']("stat -f '%Sg' /dev/console") %}
+{%-   do prometheus.update({'rootuser': macos_user}) %}
+{%-   do prometheus.update({'rootgroup': macos_group}) %}
+{%- endif %}
+
 {#- Contactenate arguments #}
 {%- macro concat_args(args) %}
 {%-   set args = args|dictsort %}

prometheus/osfamilymap.yaml

@@ -10,19 +10,16 @@
 # you will need to provide at least an empty dict in this file, e.g.
 # osfamilymap: {}
 ---
-{%- if grains.os == 'MacOS' %}
-  {% set macos_user = salt['cmd.run']("stat -f '%Su' /dev/console") %}
-  {% set macos_group = salt['cmd.run']("stat -f '%Sg' /dev/console") %}
-{%- endif %}
-
 Debian: {}
 
 RedHat:
   pkg:
     prometheus:
       repo:
+        # yamllint disable rule:line-length
         baseurl: 'https://packagecloud.io/prometheus-rpm/release/el/$releasever/$basearch'
         gpgkey: 'https://packagecloud.io/prometheus-rpm/release/gpgkey gpgkey2=https://raw.githubusercontent.com/lest/prometheus-rpm/master/RPM-GPG-KEY-prometheus-rpm'
+        # yamllint enable rule:line-length
         metadata_expire: 300
 
 Suse: {}
@@ -114,8 +111,6 @@ Windows:
       archive_hash: 9362b7482e74792f111c4bb1a372b18a88f6354c78f24713bacfbcb050883556
 
 MacOS:
-  rootuser: {{ macos_user | d('') }}
-  rootgroup: {{ macos_group | d('') }}
   kernel: darwin
   pkg:
     prometheus:

test/integration/default/inspec.yml

@@ -1,3 +1,6 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 name: default
 title: prometheus formula
 maintainer: SaltStack Formulas