Command: cat /tmp/gordboy-clone3-debian.txt

#!/bin/bash

# CLONE - clone a debian/ubuntu install

######################################################################
# At the end, all packages will be identical to the list in :
#    /usr/local/backup/ALL (if it exists)
#
# All missing Extras packages will be installed from the list in :
#    /usr/local/backup/EXTRAS (if it exists)
#
# /usr/local/backup/extras *must* contain EXTRAS packages which
# have unique names up to the first _ (underscore), matching the
# package names in EXTRAS package list
#
# All required repos *must* be active in :
#    /etc/apt/sources.list (or wherever)
#
# and all required repo GPG/PGP keys *must* be imported
#
# apt transactions logged to ~/APTLOG
######################################################################

backup_dir=/usr/local/backup
extradir=${backup_dir}/extras

# sanity checks

if [[ ! $(type -t dpkg) ]]; then
  echo "CLONE: dpkg program not found"
  exit 1
fi

if [[ ! $(type -t awk) ]]; then
  echo "CLONE: awk program not found"
  exit 1
fi

if [[ ! $(type -t comm) ]]; then
  echo "CLONE: comm program not found"
  exit 1
fi

if [[ ! $(type -t apt-get) ]]; then
  echo "CLONE: apt-get program not found"
  exit 1
fi

##################################################################

do_extras_exit()
{
	if [[ "$extras" == "yes" ]]; then
		echo "CLONE: EXTRAS package list found"

		# no need to get current again
		extra_list=$(comm -13 <(echo "$current") ${backup_dir}/EXTRAS)

		if [[ "$extra_list" ]]; then
			echo 'CLONE: Installing' $(echo "$extra_list" | wc -l) 'extra package(s) :'
			echo
			echo $extra_list
			echo

			for p in $extra_list ; do
				package_deb=$(echo ${extradir}/${p}_*)

				if [[ "${package_deb: -1}" = "*" ]]; then
					echo 'CLONE:' package $p not found

				else	if [[ "$package_deb" =~ " " ]]; then
					echo 'CLONE:' more than one debfile matches package $p

				else
					dpkg --force-all -i $package_deb > /dev/null 2>&1
				fi
				fi
			done

			echo "CLONE: Extras cloning complete"
		else
			echo "CLONE: Extras already installed"
		fi
	else
		echo "CLONE: EXTRAS package list not found"
	fi
	exit
}

##################################################################

# get current (clean install ?) package list
current=$(dpkg --get-selections | awk '{print $1}')

if [[ -f ${backup_dir}/EXTRAS ]]; then
	extras=yes
else
	extras=no
fi

if [[ -f ${backup_dir}/ALL ]]; then
	echo "CLONE: ALL package list found"
else
	echo "CLONE: ALL package list not found"
	do_extras_exit
fi

# get allbase (ALL except EXTRAS) package list
if [[ "$extras" == "yes" ]]; then
	allbase=$(comm -13 ${backup_dir}/EXTRAS ${backup_dir}/ALL)
else
	allbase=$(cat ${backup_dir}/ALL)
fi

# get currentbase (current except EXTRAS) package list
if [[ "$extras" == "yes" ]]; then
	currentbase=$(comm -13 ${backup_dir}/EXTRAS <(echo "$current"))
else
	currentbase=$current
fi

# check to see if we are already done
if [[ ! $(diff <(echo "$currentbase") <(echo "$allbase")) ]]; then
	echo "CLONE: Base cloning already done"
	do_extras_exit
fi

# remove old APTLOG
rm -f ~/APTLOG

# remove unwanted (in currentbase but not allbase) packages
unwanted=$(comm -13 <(echo "$allbase") <(echo "$currentbase"))

# don't try with empty list
if [[ "$unwanted" ]]; then
	echo 'CLONE: Purging' $(echo "$unwanted" | wc -l) 'unwanted package(s) :'
	echo
	echo $unwanted
	echo
	apt-get -y purge $unwanted >> ~/APTLOG 2>&1
else
	echo "CLONE: No unwanted packages"
fi

# update packages
echo "CLONE: Updating packages"
apt-get -y update >> ~/APTLOG 2>&1

# add missing (in allbase but not currentbase) packages
# no need to get currentbase again
missing=$(comm -13 <(echo "$currentbase") <(echo "$allbase"))

# don't try with empty list
if [[ "$missing" ]]; then
	echo 'CLONE: Installing' $(echo "$missing" | wc -l) 'missing package(s) :'
	echo
	echo $missing
	echo
	apt-get -y install $missing >> ~/APTLOG 2>&1
else
	echo "CLONE: No missing packages"
fi

# clear cache
echo "CLONE: Clearing apt cache"
apt-get clean >> ~/APTLOG 2>&1
apt-get autoclean >> ~/APTLOG 2>&1

echo "CLONE: Base cloning complete"
do_extras_exit