postfix-virtual-map

#!/bin/sh

umask 007

 DOMAINS=/etc/mail/domains
 MAPNAME=virtual

MAILFROM=root@example.com
  MAILTO=admin@example.com

LOCKFILE=/var/lock/$( basename $0 )
 MAPFILE=/etc/postfix/${MAPNAME}
 TMPFILE=$( mktemp /etc/postfix/${MAPNAME}.XXXXXXXX )
 ERRFILE=$( mktemp )

trap 'rm -f ${TMPFILE} ${ERRFILE} ${LOCKFILE}' 0 1 2 3 15

exec 9> ${LOCKFILE}
flock --exclusive 9

exec 1>&-
exec 1>  ${TMPFILE}
exec 2>&-
exec 2>> ${ERRFILE}

cd ${DOMAINS}

for DOMAIN in *
do
  case ${DOMAIN} in
    \#*|*~) continue ;;
  esac

  printf "%-39s %s\n" $DOMAIN - \
   | sed --regexp-extended \
         --expression='s/        /	/g' \
         --expression='s/ +/	/g'

  FILTEREDDOMAIN=$( mktemp /tmp/${DOMAIN}.XXXXXXXX )

  grep \
   --binary-files=text \
   --extended-regexp \
   --regexp='^$' \
   --regexp='^#' \
   --regexp='^[[:space:]]+$' \
   --regexp='^[^[:space:]]+@'${DOMAIN}'[[:space:]]+[^[:space:]]+' \
                            --regexp='^[[:space:]]+[^[:space:]]+' \
   ${DOMAIN} \
   > ${FILTEREDDOMAIN}

  FILTERDIFF="$( diff --text --unified ${DOMAIN} ${FILTEREDDOMAIN} )"

  if [ $? = 0 ]
  then
    cat ${FILTEREDDOMAIN}
    echo
  else
    REFUSE=yes
    DIFF="${DIFF}

${FILTERDIFF}"
  fi

  rm -f ${FILTEREDDOMAIN}
done

if [ "$REFUSE" = "yes" ]
then
  mail -t <<EOF
From: ${MAILFROM}
To: ${MAILTO}
Subject: ERROR from $( basename $0 ) on $( hostname -f )

Hi. This is the $( basename $0 ) program on $( hostname -f ).

Sorry, I refuse to assemble ${MAPFILE} from ${DOMAINS}/ because of the following problems I found:${DIFF}


==> standard error (if any) <==
$( cat ${ERRFILE} )
EOF
  exit 1
fi

if [ ! -f ${MAPFILE} ]
then
  touch ${MAPFILE}
fi

DIFF="$( diff -u ${MAPFILE} ${TMPFILE} )"

if [ $? = 1 ] && [ -s ${TMPFILE} ]
then

  mv -f ${TMPFILE} ${MAPFILE}
  chmod 660        ${MAPFILE}
  chgrp staff      ${MAPFILE}

  postmap          ${MAPFILE}
  chmod 660        ${MAPFILE}.db
  chgrp postfix    ${MAPFILE}.db

  umask 002
  cd /etc/postfix
  git commit \
    --author="$( basename $0 ) <${MAILFROM}>" \
   --message="$( basename $0 ) automated change
(contents of ${DOMAINS}/ changed)" \
   --quiet \
   ${MAPFILE}

  mail -t <<EOF
From: ${MAILFROM}
To: ${MAILTO}
Subject: $( basename $0 ) on $( hostname -f )

Hi. This is the $( basename $0 ) program on $( hostname -f ).

I just made the following changes based on the contents of ${DOMAINS}/ :

${DIFF}


==> standard error (if any) <==
$( cat ${ERRFILE} )
EOF

fi

This code appears in my blog post User-managed Postfix mail forwarding using inotify.