Back up deb file from installed package

backup_deb.sh

#!/usr/bin/env bash

#ref: http://www.jailbreakqa.com/questions/117086/create-deb-from-installed-package-no-longer-available-in-cydia

package="$1"

if [ ! "$package" ]
then
	echo "Usage: $0 package"
	exit 1
fi

if ! control="$(dpkg -p "$package" 2> /dev/null)"
then
	echo "Package not found: $package"
	exit 1
fi

dir="$(mktemp -d)"
cd "$dir"

mkdir "DEBIAN"
echo "$control
" > "DEBIAN/control"

for f in $(dpkg -L "$package")
do
	if [ -d "$f" ]
	then
		mkdir -p "./$f"
	elif [ -f "$f" ]
	then
		cp "$f" "./$f"
	fi
done

deb="/var/mobile/Documents/$package.deb"

dpkg -b . "$deb" &> /dev/null

rm -rf "$dir"

if [ -e "$deb" ]
then
	echo "Saved deb to: $deb"
else
	echo "Failed to save: $package"
	exit 1
fi