[Dovecot] Script: Moving Maildirs between servers

[Peter Lindgren]

Hi,
I just migrated from dovecot 1.0.rc29 to 1.1.7, from Sparc platform to
Intel, it went very well.
In the process I merged folders and excluded folders from being copied.
User rights on folders were kept/set.
I thought I'd share my migration script with you folks. If there's an
interest to put it on the wiki I can do that, but I'm not sure in what
page.
Use it as a starter if you need to do this yourselves.
Prerequisites:
  * User names are local unix accounts
  * Old server's /home must be mounted with nfs
  * Structure and user names must match between the two systems
  * Source dovecot must be at least version 1.0.x
  * Destination dovecot must be 1.1.x
  * Only dovecot data folders and files are copied, neither dovecot
indices nor Sieve scripts etc.

Here it goes, have fun!
/Peter


#!/bin/sh
#
# Migrates dovecot Maildir folders and settings from older dovecot on
# old server to new dovecot on new server.
# Prerequisites:
# * User names are local unix accounts
# * Old server's /home must be mounted with nfs
# * Structure and user names must match between the two systems
# * Source dovecot must be at least version 1.0.x
# * Destination dovecot must be 1.1.x
# * Only dovecot data folders and files are copied, neither dovecot indices nor Sieve scripts etc.
#
# Originally created by Peter Lindgren <peter at norrskenkonsult.com>
# Use this script at your own risk. No warranties whatsoever, of any kind!

# Basic settings: The first one you must definitely change, it's where you have mounted the old server's home:
SOURCEBASE=/mnt/casiopea-home
DESTBASE=/home

# Just an abbreviation:
MD=Maildir

# Change field separator, for find's sake as there might be folders with spaces:
# (doesn't play well together with the for loop otherwise)
OLDIFS=${IFS}
IFS='
'

# User loop:
# Depending on your source system's setup,
# you probably have non-interactive users with home directories (one of them
# is probably named _dovecot) that shall not be copied. Edit the username
# exclusion list according to your needs.
#
for username in `ls $SOURCEBASE`; do
{
   # This is your username exclude list:
   case $username in (maildir|_dovecot) continue;; esac

   # Here starts the real work:
   SOURCEDIR=$SOURCEBASE/$username/$MD
   DESTDIR=$DESTBASE/$username/$MD
   echo "================================"
   echo "Copying user "$username"..."
   echo "From "$SOURCEDIR" to "$DESTDIR":"

   # IMAP Folder loop:
   # Will create the Maildir folder too, the first echo $SOURCEDIR"/." does that. This way all the copying is in one place only.
   for sourceimap in `{ echo $SOURCEDIR"/." ; find $SOURCEDIR -type d -name \.\* -maxdepth 1 -print ; } | sort -f`; do
   {
     # Folder exlusion and special actions:
     # .Draft is replaced by .Drafts, so content of .Draft must be copied to .Drafts.
     # (Probably there were a client in use for a while that used .Draft instead of .Drafts.)
     # Junk mail folders with various names from clients using different languages shall not be copied.
     # .Trash shall not be copied either.
     # Folder .INBOX is a leftover from earlier versions of dovecot, and shall not be copied either.
     # Add your own exceptions to the list. Be sure to quote spaces and dots.
     basename=`basename $sourceimap`
     action=copy
     case $basename in (\.Junk|\.Junk\ E-mail|\.Correo\ electr\&APM-nico\ no\ deseado|\.Skr\&AOQ-ppost|\.Trash|\.INBOX) action=skip;; esac
     echo -n "$basename" "$action"
     if [ $action"X" == copy"X" ]; then
     {
       echo -n ":"
       destname=$basename

       # Merge contents of .Draft and .Drafts to .Drafts:
       if [ $basename"X" == .Draft"X" ]; then destname=${destname}"s"; fi

       destimap=${DESTDIR}/${destname}
       # If this is the Maildir folder (.), a clean desination name is needed for mkdir:
       if [ $basename"X" == ."X" ]; then destimap=${DESTDIR}; fi

       mkdir -m 700 "${destimap}"
       echo -n "."
       chown ${username} "${destimap}"
       echo -n "."
       chmod go-rx "${destimap}"
       echo -n "."
       cp -p  "${sourceimap}/dovecot-uidlist"  "${destimap}"
       echo -n "."
       cp -p  "${sourceimap}/dovecot-keywords" "${destimap}"
       echo -n "."
       cp -pR "${sourceimap}/cur" "${destimap}"
       echo -n "."
       cp -pR "${sourceimap}/new" "${destimap}"
       echo -n "."
       cp -pR "${sourceimap}/tmp" "${destimap}"
       echo " done."
     }
     else
     {
       echo ""
     }
     fi
   }; done
   # Copy root folder files last in user loop, since the Maildir is created in the imap loop above:
   cp -p $SOURCEDIR/subscriptions $DESTDIR
   echo "User "${username}" done."
}; done

IFS=${OLDIFS}





-- 
Peter Lindgren
http://www.norrskenkonsult.com