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GNU cfengine

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6.1 `cf.preconf' bootstrap file

In some cases you will want to run cfengine on a system to configure it from scratch. If the system is in a very bad way, it might not even be able to parse the cfengine configuration file, perhaps because the network was not properly configured or the DNS (Domain Name Service) was out of action. To help prevent this situation, cfengine looks for a script called cf.preconf which gets executed prior to parsing and can be used to perform any emergency tests. This file needs only contain enough to get the system to parse the configuration files.

cf.preconf may be any script in any language. It need not exist at all! It is fed one argument by cfengine, namely the system hard-class for the current system (e.g. ultrix). Here is an example:

 
#!/bin/sh 
#
# cf.preconf is an emergency/bootstrap file to get things going
# in case cfengine is unable to parse its config file
#

backupdir=/iu/nexus/local/iu/etc

 #
 # If these files don't exist, you might not be able to parse cfagent.conf
 #

if [ ! -s /etc/resolv.conf ]; then

 echo Patching basics resolv.conf file
 cat > /etc/resolv.conf << XX
domain iu.hioslo.no
nameserver 128.39.89.10
XX

fi

#
# SVR4
#

if [ "$1" = "solaris" ]; then

  if [ ! -s "/etc/passwd" ]; then
 
  echo Patching missing passwd file
    /bin/cp $backupdir/passwd /etc/passwd
  fi

  if [ ! -s "/etc/shadow" ]; then
    
   echo Patching missing passwd file
   /bin/cp $backupdir/shadow /etc/shadow
  fi 
fi

#
# BSD 4.3
#
 
if [ "$1" = "linux" ]; then

   if [ ! -s "/etc/passwd"  ]
   then
    
    echo Patching missing passwd file
    /bin/cp $backupdir/passwd.linux /etc/passwd
   fi
fi





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