#!/bin/bash

# A cleanup script for files published using publish(1).

# Copyright (c) 2012 Stefan Huber
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.


set -e
set -u

test_if_ancient()
{
    local d="$1"
    local ttl="$2"
    d=$(readlink -f -- "$d")

    if [ -e "$d/.publish.ttl" ]; then
        mtime="$(stat --format "%Y" "$d/.publish.ttl")"
    else
        mtime="$(stat --format "%Y" "$d")"
    fi
    tod="$(($mtime + 3600*24*$ttl))"
    now="$(date +%s)"

    [ "$optVerbose" -ge "2" ] && echo "Considering $d: ttl=$ttl, mod time=$mtime, time of death=$tod, now=$now"

    [ "$tod" -lt "$now" ] && return 0
    return 1
}


cleanit()
{
    local d="$1"
    local ttl="$2"
    d=$(readlink -f -- "$d")

    if [ -e "$d/.publish.ttl" ]; then
        local newttl
        newttl="$(cat "$d/.publish.ttl")"
        if [ "$newttl" -eq "$newttl" ] 2>/dev/null; then
            # if it is a number
            ttl="$newttl"
        else
            [ "$optVerbose" -ge "1" ] && echo "Ignoring invalid TTL setting '$newttl' in $d"
        fi
    fi

    if test_if_ancient "$d" "$ttl"; then
        [ "$optVerbose" -ge "1" ] && echo "- Purging: $d"
        [ "$optDonot" = "1" ]  || rm -rf "$d"
    fi
    return 0
}

usage()
{
    cat << EOF
Usage: $0 [OPTIONS]

OPTIONS:
   -h     Show this message.
   -n     Do not actually purge directories, but show what would be done.
   -v     Give verbose output. Be more verbose with -vv.
EOF
}

optVerbose=0
optDonot=0

while getopts "hnv" OPTION; do
   case $OPTION in
      h)
         usage
         exit 0
         ;;
      n)
         optDonot=1
         ;;
      v)
         optVerbose=$(($optVerbose + 1))
         ;;
      *)
         usage >&2
         exit 1
   esac
done


ttl=128
base=""
[ -e ~/.publish-purge.cfg ] && . ~/.publish-purge.cfg

if [ -z "$base" ]; then
    echo >&2 "$0: Please setup \$base in ~/.publish-purge.cfg."
    exit 1
fi

if ! [ -e "$base" ]; then
    echo >&2 "$0: $base does not exist or is not a directory."
    exit 1
fi

cd "$base"
# We would not like to accidentily delete files in the wrong directory, hence
# the paranoia check
if ! [ -e .publish-purge.token ]; then
    echo >&2 "$0: Place a .publish-purge.token in $base."
    exit 1
fi

for d in *; do
    cleanit "$d" "$ttl"
done


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