generate apt pinning file for keystone
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	aborrero
	Jun 12 2018, 11:12 AM

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generate apt pinning file for keystone
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	#!/bin/bash

	PKGS=""
	PINS=""

	get_depends()
	{
	apt-cache show $1/jessie-backports 2>/dev/null \| grep -e Depends -e PreDepends \
	\| awk -F'Depends:' '{print $2}' \| tr ',' '\n' \| grep $.*$ \| awk -F' ' '{print $1}'
	}

	exists_in_bpo()
	{
	if apt-cache show $1/jessie-backports 2>/dev/null >/dev/null; then
	return 0
	else
	return 1
	fi
	}

	get_version_in_bpo()
	{
	apt-cache show $1/jessie-backports \| grep ^Version: \| awk -F' ' '{print $2}'
	}

	eval_check_loop()
	{
	if grep ^${1}$ <<< "$PKGS" >/dev/null ; then
	return 1
	fi
	PKGS="$(echo "$PKGS" ; echo $1)"
	}

	pinn_check_loop()
	{
	if grep ^${1}$ <<< "$PINS" >/dev/null ; then
	return 1
	fi
	PINS="$(echo "$PINS" ; echo $1)"
	}

	generate_pinning()
	{
	name=$1
	if ! pinn_check_loop $name ; then
	return
	fi
	version=$(get_version_in_bpo $name)
	echo -e "Package: $name\nPin: version $version\nPin-Priority: 1002\n"
	}


	eval()
	{
	package=$1
	if ! eval_check_loop $package ; then
	return
	fi
	for i in $(get_depends $package)
	do
	if ! exists_in_bpo $i ; then
	continue
	fi

	generate_pinning $i
	eval $i
	done
	}

	generate_pinning keystone
	eval keystone