#!/bin/sh
# Install the .deb files of a directory a few at a time, gently, so the Brain stays usable:
#   lex01-install-batches /opt/debs-games [batch size]
# Libraries first, then data/common packages, then the rest. Progress: /var/log/lex01-batches.log
DIR=${1:?directory}; N=${2:-6}
LOG=/var/log/lex01-batches.log
export DEBIAN_FRONTEND=noninteractive
cd "$DIR" || exit 1
echo "$(date '+%F %T') START $DIR" >>"$LOG"
list=$( (ls lib*.deb; ls *-data_*.deb *-common_*.deb fonts-*.deb 2>/dev/null; ls *.deb) 2>/dev/null | awk '!seen[$0]++')
set -- $list
total=$#; done_n=0
while [ $# -gt 0 ]; do
    batch=""; i=0
    while [ $# -gt 0 ] && [ $i -lt "$N" ]; do batch="$batch $1"; shift; i=$((i + 1)); done
    # wait while memory is short or the system is already busy
    while [ "$(awk '/MemAvailable/{print int($2/1024)}' /proc/meminfo)" -lt 20 ] || \
          [ "$(cut -d. -f1 /proc/loadavg)" -ge 4 ]; do sleep 20; done
    nice -n 19 ionice -c3 dpkg -i --force-unsafe-io --force-confdef --force-confold $batch >>"$LOG" 2>&1
    sync
    done_n=$((done_n + i))
    echo "$(date '+%F %T') PROGRESS $done_n/$total" >>"$LOG"
    sleep 8
done
nice -n 19 dpkg --configure -a >>"$LOG" 2>&1
left=$(dpkg -l | grep -c '^i[UFH]')
echo "$(date '+%F %T') FINISHED unconfigured=$left" >>"$LOG"