Download apt-get packages and recursive dependencies

aptRecurse.sh

#!/bin/bash -eu

# Uses apt-get to download packages and all recursive dependencies to an apt
# repository compatible directory.
#
# Usage:
# aptRecurse [-o OUT_DIRECTORY] PACKAGE_NAME [PACKAGE_NAME]...
#
# (Credit to this StackOverflow comment
#  https://stackoverflow.com/a/45489718/868777)

archiveDir=.

while getopts "o:" opt ; do
    case $opt in
	o) archiveDir="$OPTARG"
    esac
done

shift $(( $OPTIND - 1 ))
packages="$@"

function listDepends() {
    apt-cache depends --recurse --no-recommends --no-suggests \
	      --no-conflicts --no-breaks --no-replaces --no-enhances \
	      $packages \
	| grep "^\w"
}

function downloadPacks() {
    apt-get download $@
}

function declarePacks() {
    dpkg-scanpackages -m . | gzip -c > Packages.gz
}

cd $archiveDir
downloadPacks $(listDepends)
declarePacks