Add Archlinux support

This commit adds Archlinux support. This needs changes in nginx.conf.erb
template and manifests to support pid value set to `false` (this skips it from
nginx.conf). This is due to `-pid /run/nginx.pid` being hardcoded to Archlinux
template. If you specify pid additionally in `nginx.conf` then nginx fails to
start.

manifests/package.pp

@@ -49,6 +49,12 @@ class nginx::package(
         before  => Anchor['nginx::package::end'],
       }
     }
+    'archlinux': {
+      class { 'nginx::package::archlinux':
+        require => Anchor['nginx::package::begin'],
+        before  => Anchor['nginx::package::end'],
+      }
+    }
     'Solaris': {
       class { 'nginx::package::solaris':
         package_name   => $package_name,

manifests/package/archlinux.pp

@@ -0,0 +1,25 @@
+# Class: nginx::package::archlinux
+#
+# This module manages NGINX package installation on Archlinux based systems
+#
+# Parameters:
+#
+# There are no default parameters for this class.
+#
+# Actions:
+#
+# Requires:
+#
+# Sample Usage:
+#
+# This class file is not called directly
+class nginx::package::archlinux(
+    $package_name   = 'nginx',
+    $package_ensure = 'present'
+  ) {
+
+  package { $package_name:
+    ensure  => $package_ensure,
+  }
+
+}

manifests/params.pp

@@ -78,7 +78,12 @@ class nginx::params {
   }
 
   $nx_pid = $::kernel ? {
-    /(?i-mx:linux)/  => '/var/run/nginx.pid',
+    /(?i-mx:linux)/  => $::osfamily ? {
+        # archlinux has hardcoded pid in service file to /run/nginx.pid, setting
+        # it will prevent nginx from starting
+        /(?i-mx:archlinux)/ => false,
+        default             => '/var/run/nginx.pid',
+    },
     /(?i-mx:sunos)/  => '/var/run/nginx.pid',
   }
 
@@ -93,14 +98,16 @@ class nginx::params {
       default => 'webservd',
     }
     $nx_daemon_user = $::osfamily ? {
+      /(?i-mx:archlinux)/                => 'http',
       /(?i-mx:redhat|suse|gentoo|linux)/ => 'nginx',
       /(?i-mx:debian)/                   => 'www-data',
       /(?i-mx:solaris)/                  => $solaris_nx_daemon_user,
     }
   } else {
     warning('$::osfamily not defined. Support for $::operatingsystem is deprecated')
-    warning("Please upgrade from factor ${::facterversion} to >= 1.7.2")
+    warning("Please upgrade from facter ${::facterversion} to >= 1.7.2")
     $nx_daemon_user = $::operatingsystem ? {
+      /(?i-mx:archlinux)/                                                                    => 'http',
       /(?i-mx:debian|ubuntu)/                                                                => 'www-data',
       /(?i-mx:fedora|rhel|redhat|centos|scientific|suse|opensuse|amazon|gentoo|oraclelinux)/ => 'nginx',
       /(?i-mx:solaris)/                                                                      => 'webservd',

templates/conf.d/nginx.conf.erb

@@ -3,7 +3,7 @@ worker_processes <%= @worker_processes %>;
 worker_rlimit_nofile <%= @worker_rlimit_nofile %>;
 
 error_log  <%= @nginx_error_log %>;
-pid        <%= scope.lookupvar('nginx::params::nx_pid')%>;
+<% if scope.lookupvar('nginx::params::nx_pid') != false %>pid        <%= scope.lookupvar('nginx::params::nx_pid')%>;<% end -%>
 
 events {
   worker_connections <%= @worker_connections -%>;