Customize Debian Package

#!/bin/bash

mkdir -p buildirectory/sourcecode
cd buildirectory/sourcecode
dh_make -i -n -p rash_$1 -y
rm -f debian/*.EX debian/*.ex debian/README*
mkdir files/
touch files/nrpe.cfg.default
touch debian/install debian/postinst debian/postrm
printf "files/* tmp" > debian/install
printf "files/etc/* etc" > debian/install
 > debian/postrm

cat >>debian/postrm <<EOF
#!/bin/bash
rm -fr /etc/nagios/nrpe.cfg.installed
EOF

 > debian/changelog

cat>>debian/changelog <<EOF
rash ($1) stable; urgency=medium

  * Initial build

 -- Naveed Sheikh <naveed@nash.com>  $(date -R)
EOF

 > debian/control

cat >>debian/control <<EOF
Source: rash
Section: installation
Priority: optional
Maintainer: Naveed Sheikh <naveed@nash.com>
Build-Depends: debhelper (>= 10)
Standards-Version: 4.1.2
Homepage: www.home.com

Package: rash
Architecture: all
Pre-Depends: nagios-nrpe-server
Depends: \${misc:Depends}
Description: Installing nrpe config file
EOF

 > debian/postinst

cat >>debian/postinst<<EOF
#!/bin/sh
after_upgrade() {
    :
#!/bin/bash
if [ -e /etc/nagios/nrpe.cfg.installed ]
then
    rm -fr /tmp/nrpe.cfg.default
    exit 0
else
    cd /etc/nagios/
    cat /tmp/nrpe.cfg.default > nrpe.cfg
    mv /tmp/nrpe.cfg.default nrpe.cfg.installed
    rm -fr /tmp/nrpe.cfg.default
fi
}

after_install() {
    :
#!/bin/bash
    cd /etc/nagios/
    mv nrpe.cfg nrpe.original.backup
    cat /tmp/nrpe.cfg.default > nrpe.cfg
    mv /tmp/nrpe.cfg.default nrpe.cfg.installed
    rm -fr nrpe.original.backup /tmp/nrpe.cfg.default
}

if [ "${1}" = "configure" -a -z "${2}" ] || \
   [ "${1}" = "abort-remove" ]
then
    # "after install" here
    # "abort-remove" happens when the pre-removal script failed.
    #   In that case, this script, which should be idemptoent, is run
    #   to ensure a clean roll-back of the removal.
    after_install
elif [ "${1}" = "configure" -a -n "${2}" ]
then
    upgradeFromVersion="${2}"
    # "after upgrade" here
    # NOTE: This slot is also used when deb packages are removed,
    # but their config files aren't, but a newer version of the
    # package is installed later, called "Config-Files" state.
    # basically, that still looks a _lot_ like an upgrade to me.
    after_upgrade "${2}"
elif echo "${1}" | grep -E -q "(abort|fail)"
then
    echo "Failed to install before the post-installation script was run." >&2
    exit 1
fi
EOF

chmod 755 debian/post*
dpkg-buildpackage -uc -us
exit 0