ssh-update-config

#!/bin/bash

help() {
	echo 'usage: (ssh-update-config|ssh-update-config-template)'
  echo 
  echo '    Construct a new ~/.ssh/config from ~/.ssh/config.d.'
  echo '    A backup of the current ~/.ssh/config is done'
  echo '    automatically.'
  echo
  echo '    If called as `ssh-update-config` then:'
  echo
  echo '      * ~/.ssh/config.d/* is `cat`ed together and'
  echo '        the result used as ~/.ssh/config'
  echo
  echo '    If called as `ssh-update-config-template` then:'
  echo
  echo '      * ~/.ssh/config.d/main.template is'
  echo '        `source`d instead and the result written to'
  echo '        ~/.ssh/config'
  echo 
  echo '    ssh-update-config requires the `versioned_backup`'
  echo '    script'
  exit
}

if [ "$1" == "--help" ]; then
   help
fi

error_and_exit() {
  echo $1
  exit -1
}

cat_template() {
    echo "cat << EOT"
    cat "$1"
    echo EOT
}

config=~/.ssh/config
name=$( basename "$0" )

if [ -e $config ]; then
  if ! versioned_backup $config ; then
    error_and_exit "ERROR: failed to make backup of $config"
  fi
fi

if [ "$name" == "ssh-update-config-template" ]; then

    . ~/.ssh/config.d/main.template > ~/.ssh/config

else # we were called as ssh-update-config

    cat ~/.ssh/config.d/* > ~/.ssh/config

fi