Reinstall the whole tree a given package depends on.

reinstall-tree

#!/bin/bash

set -o errexit

## Some packages kill the proces sdue to cyclic dependencies, etc.
IGNORE="<[-.a-zA-Z0-9]*> dpkg perl-base libaudit1 libdb5.1"

## User entered packages to search dependencies for.
DEPS=$@

## Get unique (sorted) list out of the given space delimited list.
unique () {
    echo $@|tr ' ' '\n'|sort -u|tr '\n' ' '
}

## Get the dependencies of the given packages.
depends () {
    apt-cache depends $@|grep Depends|awk -F ":" '{print $2}'
}

## Get the list of dependencies
until [ "$DEPS" = "$NEWDEPS" ]; do
    DEPS=$(unique "$DEPS $NEWDEPS")
    NEWDEPS=$(unique "$DEPS $(depends $DEPS)")
done

## Remove cycles
for pkg in $(echo $IGNORE|tr ' ' '\n'); do
    remvar="s/$pkg[:0-9a-zA-Z]*//g"
    echo $remvar
    DEPS=$(echo $DEPS|sed "$remvar")
done

echo "Will attempt to reinstall: $DEPS"
echo
echo "Continue? y/[n]?"

## Prompt
while [[ $yes != "y" ]]
do
    read yes
    case $yes in
        "y" )
            echo "Proceeding"
            ;;
        "yes" )
            echo "Proceeding"
            yes="y"
            ;;
        "n" )
            echo "Aborting."
            exit
            ;;
        "no" )
            echo "Aborting."
            exit
            ;;
        "" )
            echo "Aborting."
            exit
            ;;
        * )
            echo "Did not understand. Continue? y/[n]?"
            ;;
    esac
done


## Reinstall everything, including dependencies.
sudo aptitude reinstall $DEPS