diskimage-builder/diskimage_builder/elements/local-config/pre-install.d/02-proxy-settings

#!/bin/bash
# Save the HTTP/[S] and noproxy settings if available.
# XXX: Obviously not suitable for downloadable images.

if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

have_apt=
have_yum=
have_zypper=
http_proxy=${http_proxy:-""}
https_proxy=${https_proxy:-""}

if [ -d /etc/apt ] ; then
    have_apt=1
fi
if [ -e /etc/yum.conf ] ; then
    have_yum=1
fi
if [ -d /etc/zypp ] ; then
    have_zypper=1
fi

if [ -n "$http_proxy" ]; then
    if [ -d ~stack ]; then
        echo export http_proxy=$http_proxy >> ~stack/.profile
    fi
    if [ -n "$have_apt" ] ; then
        echo "Acquire::http::Proxy \"$http_proxy\";"  > /etc/apt/apt.conf.d/02-use-http-proxy
    fi
    if [ -n "$have_yum" ] ; then
        sed -i -e "s,\[main\],[main]\nproxy=$http_proxy," /etc/yum.conf
    fi
    if [ -n "$have_zypper" ] ; then
        sed -i -e "s,^HTTP_PROXY=.*$,HTTP_PROXY=\"$http_proxy\"," /etc/sysconfig/proxy
    fi
fi

if [ -n "$https_proxy" ]; then
    if [ -d ~stack ]; then
        echo export https_proxy=$https_proxy >> ~stack/.profile
    fi
    if [ -n "$have_apt" ] ; then
        echo "Acquire::https::Proxy \"$https_proxy\";"  > /etc/apt/apt.conf.d/02-use-https-proxy
    fi
    if [ -n "$have_zypper" ] ; then
        sed -i -e "s,^HTTPS_PROXY=.*$,HTTPS_PROXY=\"$https_proxy\"," /etc/sysconfig/proxy
    fi
fi

no_proxy=${no_proxy:+"$no_proxy,192.0.2.1"}
no_proxy=${no_proxy:-"192.0.2.1"}
if [ -n "$no_proxy" ]; then
    if [ -d ~stack ]; then
        echo export no_proxy=$no_proxy >> ~stack/.profile
    fi
    if [ -n "$have_apt" ] ; then
        for host in $(sed 's/,/ /g' <<<$no_proxy); do
            echo "Acquire::http::Proxy::$host \"DIRECT\";" >> /etc/apt/apt.conf.d/02-no-proxy
        done
    fi
    if [ -n "$have_zypper" ] ; then
        sed -i -e "s,^\(NO_PROXY=.*\)\"$,\1\, $no_proxy\"," /etc/sysconfig/proxy
    fi
fi

if [ -n "$http_proxy" -o -n "$https_proxy" -o -n "$no_proxy" ]; then
    if [ -n "$have_zypper" ] ; then
        sed -i -e "s,^PROXY_ENABLED=.*$,PROXY_ENABLED=\"yes\"," /etc/sysconfig/proxy
    fi
fi