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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. |
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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 |
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14 | |
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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 $BLOCKFILE; then |
58 | exit 0 |
59 | fi |
60 | |
61 | # Run redelivery for everyone |
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62 | for MBOX in /var/mail/*; do |
63 | |
64 | USER=$(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 | |
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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 | |
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102 | # Deliver mail. If the message still can't be written to |
103 | # $USER/Maildir, Exim will place it in /var/mail/$USER again. |
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104 | deliver_mail $USER $TMPMBOX |
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105 | done |