redeliver-mail

   1 #!/bin/bash
   2 #
   3 # Redeliver any messages that may have accidentally been sent to
   4 # /var/mail/$USER, due to temporary AFS glitches.
   5 #
   6 # This should be called as root on deleuze.
   7 #
   8 # USAGE: redeliver-mail [USER]
   9 #
  10 # If USER is specified, redeliver their mail, regardless of whether
  11 # mail redelivery is stopped for all users.
  12
  13 BLOCKFILE=/tmp/exim4/inhibit-redelivery
  14
  15 # Function to deliver mail for $USER.  If the message still can't be
  16 # written to $USER/Maildir, Exim will place it in /var/mail/$USER
  17 # again.
  18 function deliver_mail() {
  19     local USER=$1
  20     local TMPMBOX=$2
  21
  22     mv /var/mail/$USER $TMPMBOX
  23     formail -s /etc/exim4/deliver-once $USER < $TMPMBOX
  24     rm -f $TMPMBOX
  25 }
  26
  27 # Check arguments.
  28 if [ -n "$2" ]; then
  29     echo "Incorrect number of arguments"
  30     exit 1
  31 elif [ -n "$1" ]; then
  32     # Do redelivery for just one person
  33     USER=$1
  34     MBOX=/var/mail/$USER
  35     TMPMBOX=/tmp/exim4/$USER.mbox.tmp
  36
  37     if test -f $TMPMBOX; then
  38         echo "The temporary file $TMPMBOX still exists."
  39         echo "Please wait an hour for it to go away before running this" \
  40             "script again."
  41         exit 1
  42     fi
  43
  44     if ! test -s $MBOX || ! test -f $MBOX; then
  45         echo "$MBOX is empty"
  46         exit 1
  47     fi
  48
  49     deliver_mail $USER $TMPMBOX
  50     echo Done delivering mail for $USER
  51     exit 0
  52 fi
  53
  54 # Make sure we didn't get into trouble with an earlier run of this
  55 # script.  A separate daily cron job should run to check for the
  56 # existence of this file.
  57 if test -f $BLOCKFILE; then
  58     exit 0
  59 fi
  60
  61 # Run redelivery for everyone
  62 for MBOX in /var/mail/*; do
  63
  64     USER=$(basename $MBOX)
  65     TMPMBOX=/tmp/exim4/$USER.mbox.tmp
  66
  67     # Sanity check: file exists and has nonzero size
  68     if ! test -s $MBOX; then
  69         continue
  70     fi
  71
  72     # Sanity check: If TMPMBOX exists and is 20 minutes old or less,
  73     # there is some serious trouble, and we should (1) email
  74     # postmaster about it and (2) block future processing of /var/mail
  75     # until someone removes BLOCKFILE.
  76     #
  77     # If TMPMBOX exists and is older than 20 minutes, it's probably
  78     # stale, so blow it away.  Note that we will never get to this
  79     # point if BLOCKFILE exists, so there is no need to refine the
  80     # metric further.
  81     if test -f $TMPMBOX; then
  82         if test $(stat --format=%Y $TMPMBOX) -le \
  83             $(date --date='-20 min' +%s); then
  84             # Set block file
  85             touch $BLOCKFILE
  86             echo -e "/var/mail/$USER contains too much email." \
  87                 "\nBlocking email redelivery script until this is resolved." \
  88                 "\n\nTo indicate that this is resolved, do the following" \
  89                 "\non deleuze." \
  90                 "\n (1) Wait for $TMPMBOX to go away (should take an hour)" \
  91                 "\n (2) Run '$0 $USER'" \
  92                 "\n (3) Remove $BLOCKFILE" | \
  93               mail -s "[redeliver-mail] Mail backlog too large on deleuze" \
  94                 -e -a "From: root@deleuze.hcoop.net" \
  95                 postmaster@deleuze.hcoop.net
  96             exit 0
  97         else
  98             rm -fr $TMPMBOX
  99         fi
 100     fi
 101
 102     # Deliver mail.  If the message still can't be written to
 103     # $USER/Maildir, Exim will place it in /var/mail/$USER again.
 104     deliver_mail $USER $TMPMBOX
 105 done