Example fact to determine the role of a server

role.rb

# Fact: role
#
# Purpose:
#   Return the installed and running applications on the system.
#
# FIXME: Add mongodb, amq, varnish, 
# FIXME: As of now, interpreting/matching text and not return codes :(

Facter.add(:role) do
  setcode do
  introle = []

    # Check for MySQL
    if mysqlstatus = Facter::Util::Resolution.exec('service mysqld status') \
      and mysqlstatus =~  /^mysqld \(pid .*\) is running\.\.\.$/
      introle << "mydb"
    end

    # And postgresql...
    if pgsqlstatus = Facter::Util::Resolution.exec('service postgresql status') \
      and pgsqlstatus =~  /^postmaster \(pid .*\) is running\.\.\.$/
        # Perhpas this should be factored out...? 
      introle << "pgdb"
    end

    # And then apache ...
    if apachestatus = Facter::Util::Resolution.exec('service httpd status') \
      and apachestatus =~  /^httpd \(pid .*\) is running\.\.\.$/
        # Perhpas this should be factored out...? 
      introle << "webfront"
    end

    # And Oracle



    # And appserver / tomcat
    # How to check this? Init scripts are not suited for this ... pgrep? ...

    role = introle.join(", ")
  end
end


Facter.add(:mydb) do
  setcode do
    dbs =  Facter::Util::Resolution.exec("mysql -e 'show databases' -B | egrep -v '^Database$|^information_schema$|^mysql$'")
    mydb = []
    mydb << dbs.split("\n")
    mydb = mydb.join(", ")
    mydb
  end
end

Facter.add(:pgdb) do
  setcode do
    dbs =  Facter::Util::Resolution.exec("sudo -u postgres psql -l --pset border=off 2>/dev/null | egrep '^[a-zA-Z]' | awk {'print $1'}")
    pgdb = []
    pgdb  << dbs.split("\n")
    pgdb  = pgdb.join(", ")
    pgdb
  end
end


# Note that this only works with named virtual hosts and not aliases.
Facter.add(:webfront_vhosts) do
  setcode do
    # testing purposes
    vhosts =  Facter::Util::Resolution.exec("apachectl -S 2> /dev/null | grep namevhost | awk {'print $4'} | sort | uniq")
    webfront_vhosts = []
    webfront_vhosts  << vhosts.split("\n")
    webfront_vhosts  = webfront_vhosts.join(", ")
    webfront_vhosts
  end
end


# Maybe this should check (using init scripts) wether the application actually runs?
# Check for /etc/init.d/tomcatsuperscript's symlinks. Iterate and check status for each.
# Check if the application is actually started and if supposed to start. Return some kind of list with this.

Facter.add(:tomcat_apps) do
  setcode do
    apps =  Facter::Util::Resolution.exec("ls -1 /apps/tomcat/")
    tomcat_apps = []
    tomcat_apps << apps.split("\n")
    tomcat_apps = tomcat_apps.join(", ")
    tomcat_apps
  end
end