Wrapper for cron tasks to send e-mails with PGP/MIME encryption

pgpcronmail.sh

from=$USER@$(hostname -f)
to=$MAILTO

out=$(mktemp)
err=$(mktemp)

started=$(date)

"$@" > $out 2> $err

statuscode=$?
ended=$(date)

if [ -s $out -o -s $err ]
then

{
cat <<END
MIME-Version: 1.0
From: $from
To: $to
Content-Type: multipart/encrypted;
  boundary=rootpart;
  protocol="application/pgp-encrypted"

--rootpart
Content-Type: application/pgp-encrypted
Content-Description: PGP/MIME Version identification

Version: 1

--rootpart
Content-type: application/octet-stream; name="encrypted.asc"
Content-Description: OpenPGP encrypted message
Content-Disposition: inline; filename="encrypted.asc"

END
{
cat <<END
MIME-Version: 1.0
From: $from
To: $to
Subject: Cron job output
Content-Type: multipart/mixed; boundary=payloadpart

--payloadpart
Content-Type: text/plain; charset="UTF-8"
Content-Disposition: inline
Content-Transfer-Encoding: base64

END

base64 -w 76 <<END
There was some output from the following cron command:

  $@

  Started:  $started
  Ended:    $ended
  Returned: $statuscode
  Run as:   $USER
  Run in:   $(pwd)
END

if [[ -s $out ]]
then
cat <<END

--payloadpart
Content-Type: text/plain; charset="UTF-8"
Content-Disposition: attachment; filename="stdout"
Content-Transfer-Encoding: base64

END
base64 -w 76 < $out
fi

if [[ -s $err ]]
then
cat <<END

--payloadpart
Content-Type: text/plain; charset="UTF-8"
Content-Disposition: attachment; filename="stderr"
Content-Transfer-Encoding: base64

END
base64 -w 76 < $err
fi

cat <<END

--payloadpart--
END
} | gpg --trust-model=always --batch --encrypt --armor --recipient $to
cat <<END

--rootpart--
END
} | sendmail -- $to

fi