#!/bin/sh -e

SAPIS="/etc/php5/apache2:apache2:php5 /etc/php5/apache2filter:apache2:php5 /etc/php5/cgi:php:php5 /etc/php5/fpm:php5-fpm:php5 /etc/hhvm:hhvm:hhvm\t--php"

# Iterate through all web SAPIs
(
proc_names=""
for sapi in $SAPIS; do
    conf_dir=$(echo "$sapi" | cut -d: -f1)
    proc_name=$(echo "$sapi" | cut -d: -f2)
    php_exec=$(echo "$sapi" | cut -d: -f3)

    if [ -e ${conf_dir}/php.ini ]; then
        save_handler=$(${php_exec} -c ${conf_dir}/php.ini -d "error_reporting='~E_ALL'" -r 'echo ini_get("session.save_handler");' | sed -e 's/.*;//')
        save_path=$(${php_exec} -c ${conf_dir}/php.ini -d "error_reporting='~E_ALL'" -r 'echo ini_get("session.save_path")?: "/tmp";' | sed -e 's/.*;//')
        gc_maxlifetime=$(${php_exec} -c ${conf_dir}/php.ini -d "error_reporting='~E_ALL'" -r 'echo ini_get("session.gc_maxlifetime")/60;')
        if [ "$save_handler" = "files" -a -d "$save_path" ]; then
            proc_names="$proc_names\n$proc_name"
            echo "$save_path:$gc_maxlifetime"
        fi
    fi
done
# first find all open session files and touch them (hope it's not massive amount of files)
for pid in $(echo $proc_names | sort -u | xargs pidof); do
    find "/proc/$pid/fd" -ignore_readdir_race -lname "$save_path/sess_\*" -exec touch -c {} \;
done
) | sort -r | sort -u -t: -k 1,1 | while IFS=: read -r save_path gc_maxlifetime; do
    # find all files older then maxlifetime and delete them
    find -O3 "$save_path" -depth -mindepth 1 -name 'sess_*' -ignore_readdir_race -type f -cmin "+$gc_maxlifetime" -delete
done

exit 0