create a deb file from an existing directory tree

create_debpackage.sh

#/bin/sh

# usage:
# version=123 sh create_debpackage.sh
package=bcwebsite
# version=234
if [ ! -d ${package} ]; then  

mkdir -p ${package}/DEBIAN
  
cat << EOF1 > ${package}/DEBIAN/control
Package: bcwebsite
Version: ${version}
Architecture: amd64
Depends: 
Maintainer: Nuno Leitao <nunogrl@gmail.com>
Description: SMF engine to serve Barbear Classico site.
EOF1

cat << EOF2 > ${package}/DEBIAN/postinst 
#!/bin/sh
set -e
echo "this is the postinstall"
#Move the bootstrap file to proper location
# mv /opt/myPackage/packaging/bootstrap.prod /opt/myPackage/.bootstraprc

#Clear the DEBIAN folder
# rm -rf /opt/myPackage/packaging/DEBIAN
EOF2

cat << EOF3 > ${package}/DEBIAN/preinst 
#!/bin/sh

echo "Do something"
EOF3

chmod 755 bcwebsite/DEBIAN/*inst
fi

ver=$(grep Version ${package}/DEBIAN/control | cut -d" " -f2)
newver=$(( $ver + 1 ))
sed -i "s/Version: .*/Version: $newver/g" bcwebsite/DEBIAN/control
tar cf - /opt/nci | (cd ${package} ; tar xf -) 
dpkg-deb --build ${package} && dpkg-name -o -s .. ${package}.deb