Script to reinstall Debian packages that have D-Bus configuration files

reinstall_deb_dbus.sh

#!/bin/bash
# Debian System Reinstaller - D-Bus config file package reinstaller
# Copyright (C) 2015 Albert Huang
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
# 
# ---
# This script assumes you are using a Debian based system
# (Debian, Mint, Ubuntu, #!), and have sudo installed. If you don't
# have sudo installed, replace "sudo" with "su -c" instead.
# 
# Note that this script is specifically designed to reinstall D-Bus
# configuration files missing from your system. This does NOT reinstall
# your whole system.
# 

becho() {
	echo -e "\033[1m$@\033[0m"
}

spinat=0

spinner() {
	spinat=`expr $spinat + 1`
	if [ "$spinat" = "1" ];then
		spin="|"
	elif [ "$spinat" = "2" ];then
		spin="/"
	elif [ "$spinat" = "3" ];then
		spin="-"
	elif [ "$spinat" = "4" ];then
		spin="\\"
		spinat=0;
	else
		spinat=0;
	fi
	printf "\b$spin"
}

spinner_loop() {
	while :; do
		spinner
		sleep 0.1s
	done
}

spinner_register() {
	spinner_proc=$1
	export spinner_proc
}

spinner_cancel() {
	kill -PIPE $spinner_proc
	printf "\b \b"
}

stopnow=0
export stopnow

trap "echo 'Detected CTRL-C, exiting...'; stopnow=1; export stopnow" INT TERM

becho " * Scanning for packages with /etc/dbus-1/system.d files..."

spinner_loop &
spinner_register %%

systemdotd_pkgs=`dpkg -S dbus-1/system.d | cut -f1 -d':' | sed 's/,//g'`

spinner_cancel

[ "$stopnow" = "1" ] && exit

becho " * Scanning for all installed packages on the system..."

spinner_loop &
spinner_register %%

pkgs=`dpkg --get-selections | grep -w 'install$' | cut -f 1 | \
		egrep -v '(dpkg|apt)'`

spinner_cancel

[ "$stopnow" = "1" ] && exit

becho " * Filtering system.d installed packages..."

spinner_loop &
spinner_register %%

final_pkgs=""

for syspkg in $systemdotd_pkgs; do
	echo $pkgs | grep $syspkg 2>&1 >/dev/null && \
		echo $final_pkgs | egrep -v $syspkg 2>&1 >/dev/null && \
		if [ "$final_pkgs" == "" ]; then final_pkgs="$syspkg"; \
			else final_pkgs="$final_pkgs $syspkg"; fi
done

spinner_cancel

[ "$stopnow" = "1" ] && exit

becho " * Final packages to reinstall to recover /etc/dbus-1/system.d files:"
echo "   $final_pkgs"
becho " * Reinstallation will start in 3 seconds..."

[ "$stopnow" = "1" ] && exit

sleep 3s

[ "$stopnow" = "1" ] && exit

becho " * Reinstalling..."

rm -f reinstall_dbus.log

for pkg in $final_pkgs; do
	echo -e "\033[1m   * Reinstalling:\033[0m $pkg"
	echo "***** Reinstalling: $pkg *****" >> reinstall_dbus.log
	printf "      "
	[ "$stopnow" = "1" ] && exit
	spinner_loop &
	spinner_register %%
	sudo apt-get -q -y --force-yes install --reinstall -o Dpkg::Options::="--force-confmiss" $pkg >> reinstall_dbus.log
	cerr=$?
	spinner_cancel
	backstep "      "
	if [ ! "$cerr" = "0" ]; then
		echo "ERROR: Reinstallation failed. See reinstall.log for details."
		exit 1
	fi
	[ "$stopnow" = "1" ] && exit
done

@alberthdev Oh gosh, this script saved my life. Thank you. I'd suggest running shellcheck; I don't know what the "backstep" command is, it's not registered. Also --force-yes is deprecated these days.