#!/bin/bash

## DOC: cran2deb update
## DOC:     update the cran2deb cache and database
## DOC: cran2deb update full
## DOC:     force a full update of the cran2deb cache and database
## DOC:

set -e
cachedir="/var/cache/cran2deb/results/"
pbuildercache="/var/cache/pbuilder/"

if [ -e /etc/cran2deb/config ]; then
    . /etc/cran2deb/config;
elif [ -r ~/.cran2deb_config ]; then
    . ~/.cran2deb_config;
fi;

umask 002
root=$1
if [ -z "$root" ]; then
       echo "You need to specify the root of your installation, i.e. the folder in which to find the exec subdirectory."
       exit 1
fi

shift
sys=$(cran2deb which_system)
mkdir -p $(cachedir)/$sys
#update_period=10800
update_period=108

cache_rda="${cachedir}/cache.rda"
if [ ! $1 = full ] || [ ! -e "${cache_rda}" ]; then
    delta=$(($update_period+1))
    echo Forcing cache update
else
    seconds_time=$(date +%s)
    seconds_file=$(stat -c '%Y' "${cache_rda}")
    delta=$(($seconds_time-$seconds_file))
    echo Cache is $delta seconds out of date, auto-update after $update_period seconds.
fi

if [ ! -e "${cache_rda}" ] || [ $delta -gt $update_period ]; then
    mode=create
    if [ -e "${pbuilder_cache}"/base-cran2deb-$sys.tgz ]; then
        mode=update
    fi
    echo C: sudo pbuilder $mode --override-config --configfile /etc/cran2deb/sys/$sys/pbuilderrc
    echo "Executing sudo pbuilder $mode --override-config --configfile /etc/cran2deb/sys/$sys/pbuilderrc"
    sudo pbuilder $mode --override-config --configfile /etc/cran2deb/sys/$sys/pbuilderrc
    echo "Executing $root/exec/update_cache $root"
    $root/exec/update_cache $root
fi