#!/bin/bash
# file: migrate-users
# author: Richard Keech <rkeech@redhat.com>

# This script assists in the conversion of mail boxes
# in mbox format to maildir format.
# See also migrage-folders.

#This is a list of users to have their mail folders created.
#One user per line. 
#Suggest create with cut -d: -f1 /etc/passwd > ~/migrate/u1
#then remove inappropriate entries by hand.
USERLIST=/root/migrate/userlist

#Specify the location of the new location for mail folders.
#This cannot be the same as the old location because it will
#create directory names that contend with existing file names.
NEWBASE=/var/spool/mail2/

echo this will create user mail folders in $NEWBASE from
echo the list of users in $USERLIST.
echo
echo "Do you want to continue? (y/n)"
read ans
if [ "$ans" != "y" ]
then 
  echo Good Bye.
  exit 0
fi

if [ ! -f "$USERLIST" ]
then 
  echo Error: user list file \"$USERLIST\" does not exist.
  exit 1
fi

if [ ! -d "$NEWBASE" ]
then
  echo Error: new base directory \"$NEWBASE\" does not exist.
  exit 1
fi

while read user
do
  if grep ^${user}: /etc/passwd &> /dev/null
  then
    echo User \"$user\" is OK.
  else
    echo User \"$user\": is bogus.
    exit 1
  fi

  mkdir ${NEWBASE}/$user 
  newdir="${NEWBASE}/${user}/"
  mkdir -p "$newdir"/cur
  mkdir -p "$newdir"/new
  mkdir -p "$newdir"/tmp
  chmod -R 770 "${newdir}"
  chown -R ${user}:mail "$newdir"
done < $USERLIST

echo 
echo New mail directories have been created under $NEWBASE
echo
echo If required, prepare a list of existing mbox folders
echo as /root/migrate/folderlist and run migrate-folders.
echo
echo To make the new base mail directory active, change the
echo mail_spool_directory setting for postfix using
echo postconf -e \"mail_spool_directory = ${NEWBASE}/\"
echo and change Dovecots default_mail_env setting in
echo /etc/dovecot.conf to
echo default_mail_env = maildir:${NEWBASE}/%u
echo
echo If you want to migrate existing mail folders then defer
echo the dovecot and postfix changes until the folder migration
echo is complete.