diskimage-builder/diskimage_builder/elements/ubuntu/pre-install.d/01-set-ubuntu-mirror

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#!/bin/bash
if [ ${DIB_DEBUG_TRACE:-0} -gt 1 ]; then
set -x
fi
set -eu
set -o pipefail
DIB_DISTRIBUTION_MIRROR=${DIB_DISTRIBUTION_MIRROR:-}
[ -n "$DIB_DISTRIBUTION_MIRROR" ] || exit 0
while IFS= read line
do
if [[ "$line" =~ "${DIB_DISTRIBUTION_MIRROR_UBUNTU_IGNORE:-}" ]]; then
# append line unmodified
echo "$line" | tee --append /etc/apt/sources.list.new
else
echo "$line" | \
sed -e "s&http://\(archive\|security\).ubuntu.com/ubuntu&$DIB_DISTRIBUTION_MIRROR&" | \
tee --append /etc/apt/sources.list.new
fi
done < /etc/apt/sources.list
if [[ -n "${DIB_DISTRIBUTION_MIRROR_UBUNTU_INSECURE:-}" ]]; then
echo "APT::Get::AllowUnauthenticated \"true\";" | tee /etc/apt/apt.conf.d/95allow-unauthenticated
echo "Acquire::AllowInsecureRepositories \"true\";" | tee -a /etc/apt/apt.conf.d/95allow-unauthenticated
fi
mv /etc/apt/sources.list.new /etc/apt/sources.list