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#!/bin/bash
function usage() {
local BASECMD
BASECMD=$(basename "$0")
echo "usage: $BASECMD <packages...>"
echo 'idempotent debian package installation : update if necessary, install only if not yet done'
exit 1
}
[ "$(id -u)" -ne 0 ] && echo 'root privilege required' && exit 2
[[ $# -lt 1 ]] && usage
if [ "$(date --date='-12 hours' +%s)" -gt "$(date -d "$(stat -c %y /var/lib/apt/lists/partial)" +%s)" ]; then
echo "updating repositoring..."
apt-get update
fi
for i in "$@"; do
if ! dpkg -l "$i" 2>/dev/null | grep -q ^ii; then
sudo apt-get install -y "$i"
elif [ -n "${VERBOSE+x}" ] && $VERBOSE; then
echo "apt package <$i> already installed!"
fi
done