apt-changer

apt-changer

#!/bin/bash -e
# Copyright (c) 2017 Adam Bolte
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


# Script to update /etc/apt/sources.list.d symlink
#
# Points the symlink to a configuration relevant to the local network.
# Also does the same for any chroot environments defined within
# configuration files under /etc/schroot/chroot.d/.
#
# Will almost certainly break if chroot root directories contain a space.


declare -r default_config="ftp.au.debian.org"
declare -r ssid="$(iw dev wlp1s0 link | grep 'SSID:' | \
    sed 's/.*SSID:\ \(.*\)/\1/')"

get_fs_roots() {
    if [ -d /etc/schroot/chroot.d ]
    then
        for config in /etc/schroot/chroot.d/*
        do
            grep -E '^directory=' "${config}" | cut -d '=' -f 2
        done
    fi
    echo /
}

apt_changer() {
    for root in $(get_fs_roots)
    do
        if [ -h ${root}/etc/apt/sources.list.d -a \
            -d "${root}/etc/apt/sources.list.d.${1}" ]
        then
            rm -f "${root}/etc/apt/sources.list.d" &&
                ln -s "sources.list.d.${1}" "${root}/etc/apt/sources.list.d"
        elif [ ! -h "${root}/etc/apt/sources.list.d" ]
        then
            {
                echo "${root}/etc/apt/sources.list.d is not a symbolic link."
                echo "Not deleting"
            } 1>&2
            exit 1
        elif [ ! -d "${root}/etc/apt/sources.list.d.${1}" ]
        then
            {
                echo "${root}/etc/apt/sources.list.d.${1} is not a valid "
                echo "directory."
            } 1>&2
            exit 1
        fi
    done
}

if [ -n "${ssid}" ]
then
    apt_changer "${ssid}"
else
    apt_changer ${default_config} 
fi