New formula: nagios 3.2.3

New formula for the core of...

"The Industry Standard In IT Infrastructure Monitoring"
    -- http://www.nagios.org/

(See also pull request: https://github.com/mxcl/homebrew/pull/6470)

Closes Homebrew/homebrew#6471.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/nagios.rb

@@ -0,0 +1,113 @@
+require 'formula'
+
+class Nagios < Formula
+  url 'http://downloads.sourceforge.net/project/nagios/nagios-3.x/nagios-3.2.3/nagios-3.2.3.tar.gz'
+  homepage 'http://www.nagios.org/'
+  md5 'fe1be46e6976a52acdb021a782b5d04b'
+
+  depends_on 'gd'
+  depends_on 'nagios-plugins'
+
+  def nagios_sbin;  prefix+'cgi-bin';       end
+  def nagios_etc;   etc+'nagios';           end
+  def nagios_var;   var+'lib/nagios';       end
+  def htdocs;       share+'nagios/htdocs';  end
+  def user;         `id -un`.chomp;         end
+  def group;        `id -gn`.chomp;         end
+
+  def install
+    ENV.x11 # Required to compile some CGI's against the build-in libpng.
+    system "./configure", "--disable-debug",
+                          "--disable-dependency-tracking",
+                          "--prefix=#{prefix}",
+                          "--sbindir=#{nagios_sbin}",
+                          "--sysconfdir=#{nagios_etc}",
+                          "--localstatedir=#{nagios_var}",
+                          "--datadir=#{htdocs}",
+                          "--with-cgiurl=/nagios/cgi-bin",
+                          "--with-htmurl=/nagios",
+                          "--with-nagios-user=#{user}",
+                          "--with-nagios-group=#{group}",
+                          "--with-command-user=#{user}",
+                          "--with-command-group=_www",
+                          "--with-httpd-conf=#{share}"
+    system "make all"
+    system "make install"
+
+    # Install config
+    system "make install-config"
+    system "make install-webconf"
+    (share+'org.nagios.plist').write startup_plist
+
+    # Symlink plugins
+    libexec.rmdir
+    ln_s HOMEBREW_PREFIX+'sbin/nagios-plugins', libexec
+  end
+
+  def startup_plist
+    <<-EOS.undent
+    <?xml version="1.0" encoding="UTF-8"?>
+    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+    <plist version="1.0">
+    <dict>
+            <key>KeepAlive</key>
+            <true/>
+            <key>Label</key>
+            <string>org.nagios</string>
+            <key>ProgramArguments</key>
+            <array>
+                    <string>#{HOMEBREW_PREFIX}/bin/nagios</string>
+                    <string>#{nagios_etc}/nagios.cfg</string>
+            </array>
+            <key>RunAtLoad</key>
+            <true/>
+            <key>StandardErrorPath</key>
+            <string>/dev/null</string>
+            <key>StandardOutPath</key>
+            <string>/dev/null</string>
+            <key>UserName</key>
+            <string>#{user}</string>
+    </dict>
+    </plist>
+    EOS
+  end
+
+  def caveats
+    <<-EOS.undent
+    First we need to create a command dir using superhuman powers:
+
+      mkdir -p #{nagios_var}/rw
+      sudo chgrp _www #{nagios_var}/rw
+      sudo chmod 2775 #{nagios_var}/rw
+
+    Then install the Nagios web frontend into Apple's build-in Apache:
+
+      1) Turn on Personal Web Sharing.
+
+      2) Load the php module by patching /etc/apache2/httpd.conf:
+
+        -#LoadModule php5_module        libexec/apache2/libphp5.so
+        +LoadModule php5_module        libexec/apache2/libphp5.so
+
+      3) Symlink the sample config and create your web account:
+
+        sudo ln -sf #{share}/nagios.conf /etc/apache2/other/
+        htpasswd -cs #{nagios_etc}/htpasswd.users nagiosadmin
+        sudo apachectl restart
+
+    If you want to run nagios automatically at startup:
+
+      sudo cp #{share}/org.nagios.plist /Library/LaunchDaemons/
+      sudo launchctl load -w /Library/LaunchDaemons/org.nagios.plist
+
+    ...or simply run it on demand:
+
+      nagios #{nagios_etc}/nagios.cfg
+
+    Now log in with your web account (and don't forget to RTFM :-)
+
+      open http://localhost/nagios
+
+    EOS
+  end
+end