criu/scripts/build/extract-deb-pkg

#!/bin/bash

set -e
set -u
set -o pipefail
MIRROR="https://mirrors.kernel.org/ubuntu"
PKGS="$MIRROR/dists/xenial/universe/binary-amd64/Packages.gz"

if [ $# -ne 1 ]; then
	echo "Usage: $0 package-name" 1>&2
	exit 1
fi

if [ -d "$1" ]; then
	echo "Directory $1 already exists -- exiting"
	exit 0
fi

if ! pkg=$(curl -sSL "$PKGS" | zgrep "Filename.*$1" | awk '{ print $2 }'); then
	echo "ERROR: no packages matching $1" 1>&2
	exit 1
fi

if [ "$(wc -w <<< "$pkg")" -gt 1 ]; then
	echo "$pkg" 1>&2
	echo "ERROR: more than one match for $1" 1>&2
	exit 1
fi

mkdir "$1"
cd "$1"

wget "$MIRROR/$pkg"
pkg=$(basename "$pkg")
ar vx "$pkg"
tar xJvf data.tar.xz