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#!/bin/bash
########################################################################################################################
# apt-downgrade-bin-packages-to-official-archive.sh
########################################################################################################################
#
# All rights reserved Ⓒ 2017-2022 sdxlive.com
#
# Written by Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under a GPLv3 License.
# You may not use this file except in compliance with the License. You may obtain a copy of the License at
#
#    https://www.gnu.org/licenses/gpl-3.0.md
#
# The licensor cannot revoke these freedoms as long as you follow the license terms.
#
# Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. 
# You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
#
########################################################################################################################

########################################################################################################################
#
# Downgrading some (light mode) or all (full mode) installed binary packages with a version ending with +<os_version> or 
# -<os_version> to the package version provided by the official Debian/Ubuntu repositories.
# It is possible to pass a perl regular expression to narrow the search for installed binary packages which need to be 
# downgraded.
#
########################################################################################################################
#
# Requirements:
# ------------
#
# - We assume that apt alongside all its dependencies are already installed.
# - We expect that 'deb-src' URIs are set in your sources.list
#
########################################################################################################################
#
# Parameters:
# ----------
#
# - <os_version>: binary packages version ending with +<os_version> or -<os_version>
#                 For instance:
#       * 10|10.0       matches buster Debian distribution
#       * 11|11.0       matches bullseye Debian distribution
#       * 19.04         matches disco Ubuntu distribution
#       * 19.10         matches eoan Ubuntu distribution
#       * 20.04         matches focal Ubuntu distribution
#       * 20.10         matches groovy Ubuntu distribution
# - <mode>: one of
#       * light: downgrade only the binary packages with a version ending with +/-<os_version> for which there is the 
#                same core version available from the Debian/Ubuntu official repositories
#                Its typical use-case is to be used just before/right after an OS distribution upgrade.
#       * full:  downgrade all the binary packages with a version ending with +/-<os_version> if at least one version  
#                is available from the Debian/Ubuntu official repositories
#                Its typical use-case is to clear your Debian/Ubuntu system of all binary packages installed from the
#                DR/PPA for a specific distribution, except for the ones which have no equivalent in the official 
#                repositories.
# - <auto>: optional, one of
#       * true|yes: the binary packages will be downgraded without any user's confirmation
#                   Use with caution.
#       * false|no: the binary packages will be downgraded only with user's confirmation for each source package
#                   (default)
# - <versions_group>: optional, one of
#       + positive: downgrading only the subset of binary packages with a version ending with +<os_version> 
#       + negative: downgrading only the subset of binary packages with a version ending with -<os_version> 
#       + all: downgrading all binary packages with a version ending with +<os_version> or -<os_version> 
#              (default)
# - <perl_regex_include_pattern>: optional perl regular expression used with 'grep -P --' to narrow the search for the  
#                                 matched installed binary packages. Some special characters may need to be escaped.
#                                 Use with caution: setting <auto> to false is strongly advised when using 
#                                 <perl_regex_include_pattern>.
# - <perl_regex_exclude_pattern>: optional perl regular expression used with 'grep -Pv --' to exclude some binary packages
#                                 from the search. Some special characters may need to be escaped.
#                                 Use with caution: setting <auto> to false is strongly advised when using 
#                                 <perl_regex_exclude_pattern>.
#
#######################################################################################################################
#
# Usage example:
# -------------
#
# 1) light mode:
# =============
#
# Downgrading all binary packages with a version ending with +10.0 or -10.0 when the same core version is available from 
# official repositories.
# For instance here, systemd will be downgraded to 241-5 but wireshark won't:
# systemd:
#   Installed: 241-5+10.0
#   Candidate: 241-5+10.0
#   Version table:
#  *** 241-5+10.0 100
#         100 /var/lib/dpkg/status
#      241-5 500
#         500 http://deb.debian.org/debian testing/main amd64 Packages
# wireshark:
#   Installed: 3.0.2+10.0
#   Candidate: 3.0.2+10.0
#   Version table:
#  *** 3.0.2+10.0 100
#         100 /var/lib/dpkg/status
#      2.6.9-1 500
#         500 http://deb.debian.org/debian testing/main amd64 Packages
# 
# apt-downgrade-bin-packages-to-official-archive.sh 10.0 light true
#
# 2) full mode:
# ============
#
# Downgrading all binary packages with a version ending with +10.0 or -10.0 when any version is available from 
# official repositories.
# For instance here, systemd will be downgraded to 241-5 and wireshark will also be downgraded to 2.6.9-1:
# systemd:
#   Installed: 241-5+10.0
#   Candidate: 241-5+10.0
#   Version table:
#  *** 241-5+10.0 100
#         100 /var/lib/dpkg/status
#      241-5 500
#         500 http://deb.debian.org/debian testing/main amd64 Packages
# wireshark:
#   Installed: 3.0.2+10.0
#   Candidate: 3.0.2+10.0
#   Version table:
#  *** 3.0.2+10.0 100
#         100 /var/lib/dpkg/status
#      2.6.9-1 500
#         500 http://deb.debian.org/debian testing/main amd64 Packages
# 
# apt-downgrade-bin-packages-to-official-archive.sh 19.10 full true positive '.*' 'git|perl|python' 
#
########################################################################################################################
# set -x
# Expanding aliases
shopt -s expand_aliases

#------------------------------------apt-get-src-package-name--------------------------------------
# Getting the source package name fromp a binary package name.
function apt-get-src-package-name ()
{
        local bin_package_name=$1
        local bin_package_version=$2
        local PARAMETERS_NUMBER=2

        case "$#" in
                ${PARAMETERS_NUMBER})
                        ;;
                *)
                        echo -e ''$_{1..180}'\b-'
                        echo Wrong number of parameters: $(basename $0) $@
                        echo -e ''$_{1..180}'\b-'
                        return 1
                        ;;
        esac

        if [[ -n "$bin_package_version" ]]; then
                src_package_name=$(apt-cache -q=0 2>&1 show ${bin_package_name}=${bin_package_version} | grep Source: | head -n 1 | cut -d ' ' -f 2)
        else
                src_package_name=$(apt-cache -q=0 2>&1 show ${bin_package_name} | grep Source: | head -n 1 | cut -d ' ' -f 2)
        fi
        if [[ -z "$src_package_name" ]]; then
                src_package_name=$(apt-cache -q=0 2>&1 showsrc ${bin_package_name} | grep Package: | head -n 1 | cut -d ' ' -f 2)
                if [[ -z "$src_package_name" ]]; then
                        echo ''
                        return 1
                fi
        fi
        echo "$src_package_name"
        return 0
}

#------------------------------------apt-downgrade-bin-packages-to-official-archive.sh-------------
os_version=$1
mode=$2
auto=$3
versions_group=$4
perl_regex_include_pattern=$5
perl_regex_exclude_pattern=$6
PARAMETERS_NUMBER=2

case "$#" in
        0)
                end_of_help_message_line_number=$(awk '/^# set -x/{ print NR; exit }' $(which apt-downgrade-bin-packages-to-official-archive.sh))
                ((end_of_help_message_line_number--))
                if [[ (-n $(apt-cache -q=0 2>&1 policy zenity | grep Installed)) && (! ($(apt-cache -q=0 2>&1 policy zenity | grep Installed) =~ none)) ]]; then
                        awk -v var=$end_of_help_message_line_number 'NR >= 18 && NR <= var' $(which apt-downgrade-bin-packages-to-official-archive.sh) | zenity --text-info --title "apt-downgrade-bin-packages-to-official-archive.sh help" --width 1350 --height 1000
                else
                        awk -v var=$end_of_help_message_line_number 'NR >= 18 && NR <= var' $(which apt-downgrade-bin-packages-to-official-archive.sh)
                fi
                exit 1
                ;;
        1)
                case "$1" in
                        -h|--help)
                                end_of_help_message_line_number=$(awk '/^# set -x/{ print NR; exit }' $(which apt-downgrade-bin-packages-to-official-archive.sh))
                                ((end_of_help_message_line_number--))
                                if [[ (-n $(apt-cache -q=0 2>&1 policy zenity | grep Installed)) && (! ($(apt-cache -q=0 2>&1 policy zenity | grep Installed) =~ none)) ]]; then
                                        awk -v var=$end_of_help_message_line_number 'NR >= 18 && NR <= var' $(which apt-downgrade-bin-packages-to-official-archive.sh) | zenity --text-info --title "apt-downgrade-bin-packages-to-official-archive.sh help" --width 1350 --height 1000
                                else
                                        awk -v var=$end_of_help_message_line_number 'NR >= 18 && NR <= var' $(which apt-downgrade-bin-packages-to-official-archive.sh)
                                fi
                                exit 1
                                ;;
                        *)
                                echo -e ''$_{1..180}'\b-'
                                echo Wrong number of parameters: $(basename $0) $@
                                echo -e ''$_{1..180}'\b-'
                                exit 1
                                ;;
                esac
                ;;
        $PARAMETERS_NUMBER)
                auto=false
                versions_group=all
                perl_regex_include_pattern=''
                perl_regex_exclude_pattern=''
                ;;
        $((PARAMETERS_NUMBER+1)))
                versions_group=all
                perl_regex_include_pattern=''
                perl_regex_exclude_pattern=''
                ;;
        $((PARAMETERS_NUMBER+2)))
                perl_regex_include_pattern=''
                perl_regex_exclude_pattern=''
                ;;
        $((PARAMETERS_NUMBER+3)))
                perl_regex_exclude_pattern=''
                ;;
        $((PARAMETERS_NUMBER+4)))
                ;;
        *)
                echo -e ''$_{1..180}'\b-'
                echo Wrong number of parameters: $(basename $0) $@
                echo -e ''$_{1..180}'\b-'
                exit 1
                ;;
esac

dpkg-lock.sh apt update
# Installing dependencies needed to play an alert or a completion sound when necessary
dpkg-lock.sh apt -y install alsa-utils emacspeak pidgin-data

# Escaping the '$.*?/|\^(){}+@[]' characters for later grep -P searched string
# Letters, digits and '-' must not be escaped
alias escape_grep_pcre_search_string=$'sed -e \'s|[]$.*?/|\^(){}+@[]|\\\&|g\''
# '
# Escaping the '$.*?/|\^(){}+@[]' characters for later sed -E|-r searched string
# Letters, digits and '-' must not be escaped
alias escape_sed_ere_search_string=$'sed -e \'s|[]$.*?/|\^(){}+@[]|\\\&|g\''
# '

grep_esc_os_version="$(echo "$os_version" | escape_grep_pcre_search_string)"

os_distribution=$(lsb_release -a  2>/dev/null | grep "Distributor ID" | cut -d ':' -f 2)
os_distribution=${os_distribution//[[:space:]]/}
case $os_distribution in
        Debian)
                official_archives_uri=deb.debian.org/debian
                ;;
        Ubuntu)
                official_archives_uri=archive.ubuntu.com/ubuntu
                ;;
        *)
                echo -e ''$_{1..180}'\b-'
                echo Unknown distribution $os_distribution
                echo -e ''$_{1..180}'\b-'
                exit 1
                ;;
esac
grep_esc_official_archives_uri="$(echo "$official_archives_uri" | escape_grep_pcre_search_string)"

# Binary packages installed from distribution $os_version
bin_package_names=()
case $versions_group in
        positive)
                if [[ -n "$perl_regex_exclude_pattern" ]]; then
                        readarray -t bin_package_names < <(apt list --installed 2>/dev/null | grep -Pv -- "$perl_regex_exclude_pattern" | grep -P -- "$perl_regex_include_pattern" | grep -P -- "\+${grep_esc_os_version} " | cut -d '/' -f 1)
                else
                        readarray -t bin_package_names < <(apt list --installed 2>/dev/null | grep -P -- "$perl_regex_include_pattern" | grep -P -- "\+${grep_esc_os_version} " | cut -d '/' -f 1)
                fi
                ;;
        negative)
                if [[ -n "$perl_regex_exclude_pattern" ]]; then
                        readarray -t bin_package_names < <(apt list --installed 2>/dev/null | grep -Pv -- "$perl_regex_exclude_pattern" | grep -P -- "$perl_regex_include_pattern" | grep -P -- "-${grep_esc_os_version} " | cut -d '/' -f 1)
                else
                        readarray -t bin_package_names < <(apt list --installed 2>/dev/null | grep -P -- "$perl_regex_include_pattern" | grep -P -- "-${grep_esc_os_version} " | cut -d '/' -f 1)
                fi
                ;;
        all)
                bin_package_names_1=()
                bin_package_names_2=()

                if [[ -n "$perl_regex_exclude_pattern" ]]; then
                        readarray -t bin_package_names_1 < <(apt list --installed 2>/dev/null | grep -Pv -- "$perl_regex_exclude_pattern" | grep -P -- "$perl_regex_include_pattern" | grep -P -- "\+${grep_esc_os_version} " | cut -d '/' -f 1)
                        readarray -t bin_package_names_2 < <(apt list --installed 2>/dev/null | grep -Pv -- "$perl_regex_exclude_pattern" | grep -P -- "$perl_regex_include_pattern" | grep -P -- "-${grep_esc_os_version} " | cut -d '/' -f 1)
                else
                        readarray -t bin_package_names_1 < <(apt list --installed 2>/dev/null | grep -P -- "$perl_regex_include_pattern" | grep -P -- "\+${grep_esc_os_version} " | cut -d '/' -f 1)
                        readarray -t bin_package_names_2 < <(apt list --installed 2>/dev/null | grep -P -- "$perl_regex_include_pattern" | grep -P -- "-${grep_esc_os_version} " | cut -d '/' -f 1)
                fi

                bin_package_names=("${bin_package_names_1[@]}" "${bin_package_names_2[@]}")
                # Repacking in case the first array is empty
                python_bin_package_names=("${python_bin_package_names[@]}")
                ;;
        *)
                echo -e ''$_{1..180}'\b-'
                echo Unknown versions group $versions_group
                echo -e ''$_{1..180}'\b-'
                exit 1
                ;;
esac

# Sorting the array
if [[ ${#bin_package_names[@]} -ne 0 ]]; then
        sorted_bin_package_names=()
        IFS=$'\n' sorted_bin_package_names=($(sort -uV <<<"${bin_package_names[*]}"))
        unset IFS
else
        aplay /usr/share/sounds/purple/login.wav
        exit 0
fi

downgraded_bin_package_names_versions=()
for ((s=0; s<${#sorted_bin_package_names[@]}; s++))
do
        bin_package_family_names_versions=()
        bin_package_name="${sorted_bin_package_names[${s}]}"
        if [[ -z "$bin_package_name" ]]; then
                continue
        fi
        bin_package_installed_version=$(apt-cache -q=0 2>&1 policy "$bin_package_name" | grep Installed | sed -E 's|^.*?: (.*)$|\1|g')
        src_package_name=$(apt-get-src-package-name "$bin_package_name" "$bin_package_installed_version")
        if [[ -z "$src_package_name" ]]; then
                continue
        fi
        bin_package_installed_core_version=$(echo "$bin_package_installed_version" | sed -E "s|^(.*)[\+-]${os_version}$|\1|g")
        grep_esc_bin_package_name="$(echo "$bin_package_name" | escape_grep_pcre_search_string)"
        bin_package_official_candidate_version=$(apt-cache -q=0 2>&1 madison "$bin_package_name" | grep -P "$grep_esc_bin_package_name" | grep -P "$grep_esc_official_archives_uri" | grep amd64 | head -n 1 | cut -d '|' -f 2)
        # Removing all spaces, tabs, line breaks
        bin_package_official_candidate_version=${bin_package_official_candidate_version//[[:space:]]/}
        if [[ -n "$bin_package_official_candidate_version" ]]; then
                bin_package_family_names_versions=("${bin_package_name}@${bin_package_installed_version}@${bin_package_installed_core_version}@${bin_package_official_candidate_version}")
                # Removing $bin_package_family_name from ${sorted_bin_package_names[@]} array
                # Beware that the unset creates a gap in the array but modifies its size
                unset "sorted_bin_package_names[${s}]"
                # It also messes with the index if the removed cell index is lower than or equal to the current cell index
                ((s--))
                # Rebuilding the array to fill the gap
                sorted_bin_package_names=("${sorted_bin_package_names[@]}")
        else
                # This binary package is not available in the official repositories
                continue
        fi

        # Searching for all installed binary packages which share the same source package as $bin_package_name
        for ((index=0; index<${#sorted_bin_package_names[@]}; index++))
        do
                bin_package_name_2="${sorted_bin_package_names[${index}]}"
                if [[ (-z "$bin_package_name_2") || ("$bin_package_name_2" == "$bin_package_name") ]]; then
                        continue
                fi
                bin_package_installed_version_2=$(apt-cache -q=0 2>&1 policy "$bin_package_name_2" | grep Installed | sed -E 's|^.*?: (.*)$|\1|g')
                src_package_name_2=$(apt-get-src-package-name "$bin_package_name_2" "$bin_package_installed_version_2")
                if [[ "$src_package_name_2" == "$src_package_name" ]]; then
                        # Removing $bin_package_family_name from ${sorted_bin_package_names[@]} array
                        # Beware that the unset creates a gap in the array but modifies its size
                        unset "sorted_bin_package_names[${index}]"
                        # It also messes with the index if the removed cell index is lower than or equal to the current cell index
                        ((index--))
                        # Rebuilding the array to fill the gap
                        sorted_bin_package_names=("${sorted_bin_package_names[@]}")

                        bin_package_installed_core_version_2=$(echo "$bin_package_installed_version_2" | sed -E "s|^(.*)[\+-]${os_version}$|\1|g")
                        grep_esc_bin_package_name_2="$(echo "$bin_package_name_2" | escape_grep_pcre_search_string)"
                        bin_package_official_candidate_version_2=$(apt-cache -q=0 2>&1 madison "$bin_package_name_2" | grep -P "$grep_esc_bin_package_name_2" | grep -P "$grep_esc_official_archives_uri" | grep amd64 | head -n 1 | cut -d '|' -f 2)
                        # Removing all spaces, tabs, line breaks
                        bin_package_official_candidate_version_2=${bin_package_official_candidate_version_2//[[:space:]]/}
                        if [[ -n "$bin_package_official_candidate_version_2" ]]; then
                                bin_package_family_names_versions=("${bin_package_family_names_versions[@]}" "${bin_package_name_2}@${bin_package_installed_version_2}@${bin_package_installed_core_version_2}@${bin_package_official_candidate_version_2}")
                        else
                                # This binary package is not available in the official repositories
                                continue
                        fi
                fi
        done

        unset donwgrade_group
        # Building the $donwgrade_group with all the binary packages from the same source family and their official candidate version
        for bin_package_family_name_versions in "${bin_package_family_names_versions[@]}"
        do
                bin_package_family_name=$(echo "$bin_package_family_name_versions" | cut -d '@' -f 1)
                bin_package_family_name_official_candidate_version=$(echo "$bin_package_family_name_versions" | cut -d '@' -f 4)
                case "$mode" in
                        light)
                                bin_package_family_name_core_version=$(echo "$bin_package_family_name_versions" | cut -d '@' -f 3)
                                if [[ "$bin_package_family_name_core_version" == "$bin_package_family_name_official_candidate_version" ]]; then
                                        if [[ -z "$donwgrade_group" ]]; then
                                                donwgrade_group="${bin_package_family_name}=${bin_package_family_name_official_candidate_version}"
                                        else
                                                donwgrade_group="${donwgrade_group} ${bin_package_family_name}=${bin_package_family_name_official_candidate_version}"
                                        fi
                                fi
                                ;;
                        full)
                                if [[ -n "$bin_package_family_name_official_candidate_version" ]]; then
                                        if [[ -z "$donwgrade_group" ]]; then
                                                donwgrade_group="${bin_package_family_name}=${bin_package_family_name_official_candidate_version}"
                                        else
                                                donwgrade_group="${donwgrade_group} ${bin_package_family_name}=${bin_package_family_name_official_candidate_version}"
                                        fi
                                fi
                                ;;
                        *)
                                printf "\n"
                                echo -e ''$_{1..180}'\b-'
                                echo "Unknown mode: $mode"
                                echo -e ''$_{1..180}'\b-'
                                exit 1
                                ;;
                esac
        done

        # Downgrading all the binary packages from the same source family
        if [[ -n $donwgrade_group ]]; then
                printf "\n"
                echo -e ''$_{1..180}'\b='
                echo "Downgrading all installed binary packages from source package: $src_package_name"
                echo "to: $donwgrade_group"
                echo -e ''$_{1..180}'\b='
                case $auto in
                        true|yes)
                                dpkg-lock.sh apt --show-progress --assume-yes --allow-change-held-packages --allow-downgrades install $donwgrade_group
                                return_code=$?
                                if [[ $return_code -eq 0 ]]; then
                                        downgraded_bin_package_names_versions=("${downgraded_bin_package_names_versions[@]}" "${bin_package_family_names_versions[@]}")
                                else
                                        aplay /usr/share/emacs/site-lisp/emacspeak/sounds/classic/alert-user.wav
                                        exit 1
                                fi
                                ;;
                        false|no)
                                dpkg-lock.sh apt --show-progress install $donwgrade_group
                                return_code=$?
                                if [[ $return_code -eq 0 ]]; then
                                        downgraded_bin_package_names_versions=("${downgraded_bin_package_names_versions[@]}" "${bin_package_family_names_versions[@]}")
                                elif [[ $return_code -ne 1 ]]; then
                                        aplay /usr/share/emacs/site-lisp/emacspeak/sounds/classic/alert-user.wav
                                        exit 1
                                fi
                                ;;
                        *)
                                printf "\n"
                                echo -e ''$_{1..180}'\b-'
                                echo "Unknown auto: $auto"
                                echo -e ''$_{1..180}'\b-'
                                exit 1
                                ;;
                esac
        fi
done

if [[ ${#downgraded_bin_package_names_versions[@]} -ne 0 ]]; then
        printf "\n"
        echo -e ''$_{1..180}'\b='
        echo "The following binary packages have been downgraded from their installed version to their official candidate version:"
        echo -e ''$_{1..180}'\b='
        echo "bin_package_name <--> bin_package_installed_version <--> bin_package_installed_core_version <--> bin_package_official_candidate_version "
        echo -e ''$_{1..180}'\b='
        printf "%s\n" "${downgraded_bin_package_names_versions[@]}" | sort -uV | sed -E 's|@| <--> |g'
fi

aplay /usr/share/sounds/purple/login.wav
exit 0