migrateuser

#!/bin/sh
#
# Julian Fitzell <jfitzell@gmail.com>
#
# This script expects the username, home directory, and destination maildir
# as parameters. For example:
#
# migrateuser.sh jdoe /home/jdoe /maildirs/j/jdoe
#
# It will migrate mail from the mail spool (/var/mail/) by default and from
# all folders in the mail/ directory in the user's home. It migrates into
# a temporary folder and then renames it upon success (allowing, for example,
# your mail system to check for the presence of a Maildir and falling back
# to mbox if it is not there).
#
# You could run this for all users with something like the following (you
# might want to grep out system users; I added "| grep '/home'"):
#
# getent passwd |(IFS=:;
#  while read user pw id gp fname home sh; do
#   DATE=`date`
#   echo "---$user ($DATE)---" >&2
#   FIRSTCHAR=`echo ${user:0:1}|tr "[:upper:]" "[:lower:]"`
#   sudo -H -u $user /path/to/migrateuser.sh "$user" "$home" "/maildirs/$FIRSTCHAR/$user"
#  done) >> migratuser.log.detail 2>> migrateuser.log.errors
#
user="$1"
home="$2"
dest="$3"

MB2MD=/usr/local/sbin/mb2md.pl
MB2MD_OPTS=-UK
MAILUTIL=mailutil
MD5SUM=md5sum

INBOX=/var/mail/$user
WORKING="${dest}.mdwork.`date +%s`"
FOLDERS="$home/mail"

inbox_hash() {
  local HASH=`ls -l $INBOX`
  eval "$1=\"$HASH\""
}

folders_hash() {
  local HASH=`find $FOLDERS -type f |sort|(IFS=\
;while read file; do ls -l "\$file"; done)`
  eval "$1=\"$HASH\""
}

cd $home

WORKING_DIR=`dirname "$WORKING"`
if [ ! -d "$WORKING_DIR" ]; then
  echo "$user -- ERROR: $WORKING_DIR does not exist" >&2
  exit 1
fi

if [ -e $dest ]; then
  echo "$user -- $dest exists... [SKIPPED]" >&2
  exit 0
fi

# First do the INBOX
if [ -f $INBOX ]; then
  inbox_hash INBOX_COMP

  echo -n "$user -- Migrating INBOX... " >&2
  $MB2MD $MB2MD_OPTS -s "$INBOX" -d "$WORKING"

  CHECK_OLD=`$MAILUTIL check "$INBOX" | sed 's/in.*$//' | sed -r 's/([0-9]+ unseen)//'`
  CHECK_NEW=`$MAILUTIL check "$WORKING" | sed 's/in.*$//' | sed -r 's/([0-9]+ unseen)//'`

  if [ "$CHECK_OLD" == "$CHECK_NEW" ]; then
    echo "[OK]" >&2
  else
    echo "[ERROR] (mismatch during post compare)" >&2
    echo "$user -- $CHECK_OLD" >&2
    echo "$user -- $CHECK_NEW" >&2
    exit 1;
  fi
else
  echo "$user -- WARNING: user has no inbox in the mail spool" >&2
fi

# Then do the folders and subscriptions
if [ -d $home/mail ]; then
  folders_hash FOLDERS_COMP

  echo -n "$user -- Migrating mail folders... " >&2
  $MB2MD $MB2MD_OPTS -R -s "$FOLDERS" -d "$WORKING"
  # Not sure how to verify this part...
  echo "[DONE] (not verified)" >&2

  if [ -f "$FOLDERS/.subscriptions" ]; then
    echo -n "$user -- Migrating subscriptions... " >&2
    cat "$FOLDERS/.subscriptions" | sed 's|/+$||' | sed 's/\./_/g' | sed 's|/|\.|g' | sort | uniq > "$WORKING/subscriptions"
    chmod 600 "$WORKING/subscriptions"
    echo "[OK] (`wc -l \"$WORKING/subscriptions\" | awk '{ print $1 }'`)" >&2
  fi
else
  echo "$user -- WARNING: user has no mail/ folder" >&2
fi

# Now make sure nothing has changed and move the folder into place
echo -n "$user -- Making sure originals are unmodified... " >&2
if [[ -f $INBOX ]]; then
  inbox_hash INBOX_COMP2
  if [[ "$INBOX_COMP" != "$INBOX_COMP2" ]]; then
    echo "[CHANGED] (inbox changed)" >&2
    exit 1
  fi
fi
if [[ -d $FOLDERS ]]; then
  folders_hash FOLDERS_COMP2
  if [[ "$FOLDERS_COMP" != "$FOLDERS_COMP2" ]]; then
    echo "[CHANGED] (folders changed)" >&2
    exit 1
  fi
fi
echo "[OK]" >&2

echo -n "$user -- Copying working directory into place... " >&2
if [[ -d $WORKING ]]; then
  mv "$WORKING" "$dest"
  echo "[COMPLETE]" >&2
else
  echo "[N/A] (nothing to copy)" >&2
fi