apticron for arch

pacicron.sh

#!/bin/bash
# copy this file to /usr/local/sbin (or any other $PATH location)
# add to daily.cron

# ensure exits
VAR_FILE="/var/lib/pacicron/sha"
MAIL_TO="root"
HOST=$(uname -n)
PKGMGR=$(which yaourt || which pacman)
AURFLAG=$(which yaourt &> /dev/null && echo -en "a")

if [[ ! -f ${VAR_FILE} ]]; then
        mkdir $(dirname ${VAR_FILE})
        touch ${VAR_FILE}
fi

# syncs and downloads all packages, without asking
${PKGMGR} -Swuy --noconfirm > /dev/null
${PKGMGR} -Sy${AURFLAG} > /dev/null
PKGLIST=$(${PKGMGR} -Q${AURFLAG}u | echo) # echo for trimming
SHA_NEW=$(echo "$PKGLIST" | sha1sum | cut -d" " -f1)
SHA_OLD=$(cat ${VAR_FILE})

if [[ ${SHA_NEW} != ${SHA_OLD} && ${PKGLIST} != "" ]]; then
        MSG="Following packages would be installed:\n\r\n\r${PKGLIST}\r\n\r\nSincerly yours pacicron\r\n"
        echo -e ${MSG} | mail -s "New updates avaible on ${HOST}" -q /dev/stdin ${MAIL_TO}
        echo ${SHA_NEW} > ${VAR_FILE}
fi