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

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

```bash
syslog-ng-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
./syslog_ng/defaults.yml
  4:1       warning  missing document start "---"  (document-start)

./syslog_ng/os_family_map.yml
  4:1       warning  missing document start "---"  (document-start)

./syslog_ng/os_codename_map.yml
  5:1       warning  missing document start "---"  (document-start)

pillar.example
  1:1       warning  missing document start "---"  (document-start)
  3:3       error    wrong indentation: expected 4 but found 2  (indentation)
  5:3       error    wrong indentation: expected 4 but found 2  (indentation)
  7:3       error    wrong indentation: expected 4 but found 2  (indentation)
  10:3      error    wrong indentation: expected 4 but found 2  (indentation)
  10:15     warning  truthy value should be one of [false, true]  (truthy)
  11:14     warning  truthy value should be one of [false, true]  (truthy)
  12:15     warning  truthy value should be one of [false, true]  (truthy)
  13:20     warning  truthy value should be one of [false, true]  (truthy)
  14:22     warning  truthy value should be one of [false, true]  (truthy)
  15:21     warning  truthy value should be one of [false, true]  (truthy)
  17:3      error    wrong indentation: expected 4 but found 2  (indentation)
  18:5      error    wrong indentation: expected 6 but found 4  (indentation)
  20:5      error    wrong indentation: expected 6 but found 4  (indentation)
  22:7      error    wrong indentation: expected 8 but found 6  (indentation)
  25:3      error    wrong indentation: expected 4 but found 2  (indentation)
  26:5      error    wrong indentation: expected 6 but found 4  (indentation)
  27:7      error    wrong indentation: expected 8 but found 6  (indentation)
  29:5      error    wrong indentation: expected 6 but found 4  (indentation)
  31:5      error    wrong indentation: expected 6 but found 4  (indentation)
  33:5      error    wrong indentation: expected 6 but found 4  (indentation)
  35:5      error    wrong indentation: expected 6 but found 4  (indentation)
  37:3      error    wrong indentation: expected 4 but found 2  (indentation)
  38:5      error    wrong indentation: expected 6 but found 4  (indentation)
  40:5      error    wrong indentation: expected 6 but found 4  (indentation)
  42:5      error    wrong indentation: expected 6 but found 4  (indentation)
  45:3      error    wrong indentation: expected 4 but found 2  (indentation)

pillar.debian.example
  1:1       warning  missing document start "---"  (document-start)
  3:24      warning  truthy value should be one of [false, true]  (truthy)
  5:16      warning  truthy value should be one of [false, true]  (truthy)
  6:17      warning  truthy value should be one of [false, true]  (truthy)
  15:7      error    wrong indentation: expected 8 but found 6  (indentation)
  21:7      error    wrong indentation: expected 8 but found 6  (indentation)
  24:7      error    wrong indentation: expected 8 but found 6  (indentation)
  27:7      error    wrong indentation: expected 8 but found 6  (indentation)
  30:7      error    wrong indentation: expected 8 but found 6  (indentation)
  33:7      error    wrong indentation: expected 8 but found 6  (indentation)
  36:7      error    wrong indentation: expected 8 but found 6  (indentation)
  39:7      error    wrong indentation: expected 8 but found 6  (indentation)
  42:7      error    wrong indentation: expected 8 but found 6  (indentation)
  45:7      error    wrong indentation: expected 8 but found 6  (indentation)
  50:7      error    wrong indentation: expected 8 but found 6  (indentation)
  51:9      error    wrong indentation: expected 10 but found 8  (indentation)
  53:7      error    wrong indentation: expected 8 but found 6  (indentation)
  54:9      error    wrong indentation: expected 10 but found 8  (indentation)
  56:7      error    wrong indentation: expected 8 but found 6  (indentation)
  57:9      error    wrong indentation: expected 10 but found 8  (indentation)
  61:7      error    wrong indentation: expected 8 but found 6  (indentation)
  62:9      error    wrong indentation: expected 10 but found 8  (indentation)
  64:7      error    wrong indentation: expected 8 but found 6  (indentation)
  65:9      error    wrong indentation: expected 10 but found 8  (indentation)
  67:7      error    wrong indentation: expected 8 but found 6  (indentation)
  68:9      error    wrong indentation: expected 10 but found 8  (indentation)
  72:7      error    wrong indentation: expected 8 but found 6  (indentation)
  73:9      error    wrong indentation: expected 10 but found 8  (indentation)
  75:7      error    wrong indentation: expected 8 but found 6  (indentation)
  76:9      error    wrong indentation: expected 10 but found 8  (indentation)
  78:7      error    wrong indentation: expected 8 but found 6  (indentation)
  79:9      error    wrong indentation: expected 10 but found 8  (indentation)
  83:7      error    wrong indentation: expected 8 but found 6  (indentation)
  84:9      error    wrong indentation: expected 10 but found 8  (indentation)
  88:7      error    wrong indentation: expected 8 but found 6  (indentation)
  89:9      error    wrong indentation: expected 10 but found 8  (indentation)
  93:7      error    wrong indentation: expected 8 but found 6  (indentation)
  94:9      error    wrong indentation: expected 10 but found 8  (indentation)
  98:7      error    wrong indentation: expected 8 but found 6  (indentation)
  99:9      error    wrong indentation: expected 10 but found 8  (indentation)
  103:7     error    wrong indentation: expected 8 but found 6  (indentation)
  105:7     error    wrong indentation: expected 8 but found 6  (indentation)
  107:7     error    wrong indentation: expected 8 but found 6  (indentation)
  109:7     error    wrong indentation: expected 8 but found 6  (indentation)
  111:7     error    wrong indentation: expected 8 but found 6  (indentation)
  113:7     error    wrong indentation: expected 8 but found 6  (indentation)
  115:7     error    wrong indentation: expected 8 but found 6  (indentation)
  117:7     error    wrong indentation: expected 8 but found 6  (indentation)
  120:7     error    wrong indentation: expected 8 but found 6  (indentation)
  122:7     error    wrong indentation: expected 8 but found 6  (indentation)
  125:7     error    wrong indentation: expected 8 but found 6  (indentation)
  127:7     error    wrong indentation: expected 8 but found 6  (indentation)
  129:7     error    wrong indentation: expected 8 but found 6  (indentation)
  131:7     error    wrong indentation: expected 8 but found 6  (indentation)
  133:7     error    wrong indentation: expected 8 but found 6  (indentation)
  135:7     error    wrong indentation: expected 8 but found 6  (indentation)
  135:89    error    line too long (97 > 88 characters)  (line-length)
  137:7     error    wrong indentation: expected 8 but found 6  (indentation)
  139:7     error    wrong indentation: expected 8 but found 6  (indentation)
  141:7     error    wrong indentation: expected 8 but found 6  (indentation)
  143:7     error    wrong indentation: expected 8 but found 6  (indentation)
  145:7     error    wrong indentation: expected 8 but found 6  (indentation)
  147:7     error    wrong indentation: expected 8 but found 6  (indentation)
  149:7     error    wrong indentation: expected 8 but found 6  (indentation)
  151:7     error    wrong indentation: expected 8 but found 6  (indentation)
```

Author: myii

.travis.yml

@@ -2,22 +2,27 @@
 # vim: ft=yaml
 ---
 stages:
-  - commitlint
+  - lint
   - name: release
     if: branch = master AND type != pull_request
 
 jobs:
   include:
-    # Define the commitlint stage
-    - stage: commitlint
+    # Define the `lint` stage (runs `yamllint` and `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 pillar.debian.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.debian.example

@@ -1,9 +1,12 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 syslog_ng:
   options:
-    - chain_hostnames: no
+    - chain_hostnames: false
     - flush_lines: 0
-    - use_dns: no
-    - use_fqdn: no
+    - use_dns: false
+    - use_fqdn: false
     - owner: root
     - group: adm
     - perm: =0640
@@ -12,143 +15,144 @@ syslog_ng:
 
   source:
     - s_src:
-      - system: null
-      - internal: null
+        - system: null
+        - internal: null
 
   destination:
     # First some standard logfile
     - d_auth:
-      - file:
-          - /var/log/auth.log
+        - file:
+            - /var/log/auth.log
     - d_cron:
-      - file:
-          - /var/log/cron.log
+        - file:
+            - /var/log/cron.log
     - d_daemon:
-      - file:
-          - /var/log/daemon.log
+        - file:
+            - /var/log/daemon.log
     - d_kern:
-      - file:
-          - /var/log/kern.log
+        - file:
+            - /var/log/kern.log
     - d_lpr:
-      - file:
-          - /var/log/lpr.log
+        - file:
+            - /var/log/lpr.log
     - d_mail:
-      - file:
-          - /var/log/mail.log
+        - file:
+            - /var/log/mail.log
     - d_syslog:
-      - file:
-          - /var/log/syslog
+        - file:
+            - /var/log/syslog
     - d_user:
-      - file:
-          - /var/log/user.log
+        - file:
+            - /var/log/user.log
     - d_uucp:
-      - file:
-          - /var/log/uucp.log
+        - file:
+            - /var/log/uucp.log
 
     # This files are the log come from the mail subsystem.
     - d_mailinfo:
-      - file:
-        - /var/log/mail.info
+        - file:
+            - /var/log/mail.info
     - d_mailwarn:
-      - file:
-        - /var/log/mail.warn
+        - file:
+            - /var/log/mail.warn
     - d_mailerr:
-      - file:
-        - /var/log/mail.err
+        - file:
+            - /var/log/mail.err
 
     # Logging for INN news system
     - d_newscrit:
-      - file:
-        - /var/log/news/news.crit
+        - file:
+            - /var/log/news/news.crit
     - d_newserr:
-      - file:
-        - /var/log/news/news.err
+        - file:
+            - /var/log/news/news.err
     - d_newsnotice:
-      - file:
-        - /var/log/news/news.notice
+        - file:
+            - /var/log/news/news.notice
 
     # Some 'catch-all' logfiles
     - d_debug:
-      - file:
-        - /var/log/debug
+        - file:
+            - /var/log/debug
     - d_error:
-      - file:
-        - /var/log/error
+        - file:
+            - /var/log/error
     - d_messages:
-      - file:
-        - /var/log/messages
+        - file:
+            - /var/log/messages
 
     # The root's console.
     - d_console:
-      - usertty:
-        - root
+        - usertty:
+            - root
 
     # Virtual console.
     - d_console_all:
-      - file:
-        - '`tty10`'
+        - file:
+            - '`tty10`'
 
     # The named pipe /dev/xconsole is for the nsole' utility.
     - d_xconsole:
-      - pipe:
-        - /dev/xconsole
+        - pipe:
+            - /dev/xconsole
 
     # Debian only
     - d_ppp:
-      - file:
-        - /var/log/ppp.log
+        - file:
+            - /var/log/ppp.log
 
   filter:
     - f_dbg:
-      - level: =debug
+        - level: =debug
     - f_info:
-      - level: =info
+        - level: =info
     - f_notice:
-      - level: =notice
+        - level: =notice
     - f_warn:
-      - level: =warn
+        - level: =warn
     - f_err:
-      - level: =err
+        - level: =err
     - f_crit:
-      - level: =crit .. emerg
+        - level: =crit .. emerg
     - f_error:
-      - level: =err .. emerg
+        - level: =err .. emerg
     - f_console:
-      - level: =warn .. emerg
+        - level: =warn .. emerg
 
     - f_debug:
-      - =level(debug) and not facility(auth, authpriv, news, mail)
+        - =level(debug) and not facility(auth, authpriv, news, mail)
     - f_messages:
-      - =level(info,notice,warn) and not facility(auth,authpriv,cron,daemon,mail,news)
+        - =level(info,notice,warn) and not facility(auth,authpriv,cron,daemon,mail,news)
 
     - f_auth:
-      - =facility(auth, authpriv) and not filter(f_debug)
+        - =facility(auth, authpriv) and not filter(f_debug)
     - f_cron:
-      - =facility(cron) and not filter(f_debug)
+        - =facility(cron) and not filter(f_debug)
     - f_daemon:
-      - =facility(daemon) and not filter(f_debug)
+        - =facility(daemon) and not filter(f_debug)
     - f_kern:
-      - =facility(kern) and not filter(f_debug)
+        - =facility(kern) and not filter(f_debug)
     - f_lpr:
-      - =facility(lpr) and not filter(f_debug)
+        - =facility(lpr) and not filter(f_debug)
     - f_local:
-      - =facility(local0, local1, local3, local4, local5, local6, local7) and not filter(f_debug)
+        # yamllint disable-line rule:line-length
+        - =facility(local0, local1, local3, local4, local5, local6, local7) and not filter(f_debug)
     - f_mail:
-      - =facility(mail) and not filter(f_debug)
+        - =facility(mail) and not filter(f_debug)
     - f_news:
-      - =facility(news) and not filter(f_debug)
+        - =facility(news) and not filter(f_debug)
     - f_syslog3:
-      - =not facility(auth, authpriv, mail) and not filter(f_debug)
+        - =not facility(auth, authpriv, mail) and not filter(f_debug)
     - f_user:
-      - =facility(user) and not filter(f_debug)
+        - =facility(user) and not filter(f_debug)
     - f_uucp:
-      - =facility(uucp) and not filter(f_debug)
+        - =facility(uucp) and not filter(f_debug)
     - f_cnews:
-      - =level(notice, err, crit) and facility(news)
+        - =level(notice, err, crit) and facility(news)
     - f_cother:
-      - =level(debug, info, notice, warn) or facility(daemon, mail)
+        - =level(debug, info, notice, warn) or facility(daemon, mail)
     - f_ppp:
-      - =facility(local2) and not filter(f_debug)
+        - =facility(local2) and not filter(f_debug)
 
   log:
     -

pillar.example

@@ -1,61 +1,64 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 syslog_ng:
   module:
-  - tfson
+    - tfson
   include:
-  - scl.conf
+    - scl.conf
   last_include:
-  - /etc/syslog-ng/conf.d/*.conf
+    - /etc/syslog-ng/conf.d/*.conf
   version: 3.5
   options:
-  - threaded: yes
-  - use_dns: no
-  - use_fqdn: yes
-  - keep_hostname: yes
-  - chain_hostnames: no
-  - check_hostname: no
+    - threaded: true
+    - use_dns: false
+    - use_fqdn: true
+    - keep_hostname: true
+    - chain_hostnames: false
+    - check_hostname: false
   source:
-  - s_internal:
-    - internal: null
-  - s_local:
-    - unix-stream: /dev/log
-    - file:
-      - /proc/kmsg
-      - program_override: kernel
+    - s_internal:
+        - internal: null
+    - s_local:
+        - unix-stream: /dev/log
+        - file:
+            - /proc/kmsg
+            - program_override: kernel
   destination:
-  - df_messages:
-    - file:
-      - /var/log/messages
-  - df_secure:
-    - file: /var/log/secure
-  - df_console:
-    - usertty: root
-  - dp_devnull:
-    - program: /bin/cat >/dev/null
-  - dr_central:
-    - syslog: my-remote.example.com
+    - df_messages:
+        - file:
+            - /var/log/messages
+    - df_secure:
+        - file: /var/log/secure
+    - df_console:
+        - usertty: root
+    - dp_devnull:
+        - program: /bin/cat >/dev/null
+    - dr_central:
+        - syslog: my-remote.example.com
   filter:
-  - f_messages:
-    - level: =info..emerg
-  - f_secure:
-    - facility: =authpriv
-  - f_emerg:
-    - level: =emerg
-    - facility: =uucp, news
+    - f_messages:
+        - level: =info..emerg
+    - f_secure:
+        - facility: =authpriv
+    - f_emerg:
+        - level: =emerg
+        - facility: =uucp, news
   log:
-  -
-    - source: =s_internal
-    - source: =s_local
-    - destination: =dr_central
-  -
-    - source: =s_local
-    - filter: =f_emerg
-    - destination: =df_console
-  -
-    - source: =s_local
-    - filter: =f_secure
-    - destination: =df_secure
-    - flags: =final
-  -
-    - source: =s_local
-    - filter: =f_messages
-    - destination: =df_messages
+    -
+      - source: =s_internal
+      - source: =s_local
+      - destination: =dr_central
+    -
+      - source: =s_local
+      - filter: =f_emerg
+      - destination: =df_console
+    -
+      - source: =s_local
+      - filter: =f_secure
+      - destination: =df_secure
+      - flags: =final
+    -
+      - source: =s_local
+      - filter: =f_messages
+      - destination: =df_messages