Tag Archives: unix

Clear exim queue

The queue can be viewed with mailq, which is the same as exim -bp.
You can view individual messages using exim -Mvc <message-id>. Once you’re done, run

exim -bp | grep -Eo "[[:alnum:]]{6}-[[:alnum:]]{6}-[[:alnum:]]{2}" | xargs exim -Mrm

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logrotate complains about insecure parent directory permissions

I’ve received this message recently:

error: skipping "/var/log/exim/mainlog" because parent directory has insecure permissions (It's world writable or writable by group which is not "root") Set "su" directive in config file to tell logrotate which user/group should be used for rotation.

…and a few other of similar nature. Turns out /var/log/exim/ were indeed group-writable. Easy to fix.

Dump audio from video, revisited

From some post on some mailing list:

mencoder -v -ovc copy -oac mp3lame -o out.avi INPUT-FILE -ss HH:MM:SS
mplayer -v -vo null -vc dummy -ao pcm -dumpaudio -dumpfile out.mp3 out.avi

Exim: force retrying delivery of mail in local spool

My mail got stuck in the spool a few days ago due to misconfiguration of ~/.forward. After fixing the file, the commands to force retry of delivery are:

cd /var/spool/exim/msglog
exim -M *

or

exim -qf

Provided, of course, your shell is smart enough to do * expansion properly.

Exim 4.69 (or 4.71) ACL for SpamAssassin

I was having trouble with Exim not adding headers to SpamAssassin-checked emails. One day, when I should have really been doing something else, I read Chapter 40 of Exim’s specification, and all became clear.

Here’s what my appropriate ACL (in /etc/mail/exim.conf) looks now, almost completely by-the-book:

acl_check_data:
  
  # ...
  # malware section
  # ...
  
  # Add headers to a message if it is judged to be spam. Before enabling this,
  # you must install SpamAssassin. You may also need to set the spamd_address  
  # option above.
  
  # spams are never big and spamassassin can die on big emails, so we  
  # limit its use under 100kb  
  accept  condition = ${if >={$message_size}{100k}{yes}{no}}

  # put headers in all messages (no matter if spam or not)
  warn  spam = spamd:true
        add_header = X-Spam-Score: $spam_score ($spam_bar)
        add_header = X-Spam-Report: $spam_report
  
  # add second subject line with *SPAM* marker when message
  # is over threshold
  warn  spam = spamd
        add_header = Subject: *SPAM* $h_Subject:

  # reject spam at high scores (> 20)
  deny  message = This message scored $spam_score spam points.
        spam = spamd:true
        condition = ${if >{$spam_score_int}{200}{1}{0}}

  # Accept the message.
  accept

Emacs with Tramp using zsh

First off, I recommend reading the relevant parts of the user manual, you might find the answer there.

Now, to the issue.

I installed tramp and added this to ~/.emacs:

(require 'tramp)
(setq tramp-default-method "scp")

Nothing special here, except it didn’t work. (The message was something like “waiting 60s for local shell”. Of course, I didn’t write it down, and it got lost in the browsing cache.)

So I turned on more verbose debugging, in ~/.emacs also:

(setq tramp-debug-buffer t)
(setq tramp-verbose 10)

The “logs”, mind you, are written into buffers: *debug/scp remotehost* are the messages and *tramp/scp remotehost* is the medium-rare (as compared to raw) data received.

If you open the latter and see characters like ^]]C4 or ^M, then it might be due to the shell prompt setting on the remote host. The manual advises wisely as to what should be considered.

One solution found floating on the internets is checking for the terminal type. Add this to the remote host’s .zshenv:


if [ "$TERM" = "dumb" ]
then
unsetopt zle
unsetopt prompt_cr
unsetopt prompt_subst
# unfunction precmd # these two are not
# unfunction preexec # working for me
PS1='$ '
fi

Also, make sure you’re not re-setting it somewhere else later, say .zshrc. A check should be enough even if you do:

if [ "$TERM" != "dumb" ]; then
# Set prompts
PROMPT='%m%# '
RPROMPT='[%C]'
fi

Making a GRUB boot floppy

mkfs -V -t msdos /dev/fd0
mount /dev/fd0 /media/floppy
cd /media/floppy
mkdir boot
mkdir boot/grub
cp -pa /boot/grub/* /media/floppy/boot/grub
umount /media/floppy
/sbin/grub --batch --device-map=/dev/null <<EOF
device (fd0) /dev/fd0
root (fd0)
setup (fd0)
quit
EOF

Lifted from Linux-SXS and GNU Hurd FAQ.

Tor on per-tab basis

I have just had this idea: since uzbl_tabbed.py in fact reads the config file for every new tab (i.e. every new uzbl instance), it should be very easy to allow tor be enabled on a per-tab basis, something I wanted badly for Firefox. Nais!

Configuring Exim to use SpamAssassin in ArchLinux

There’s a lot of outdated stuff floating on the internets. This one was most useful to me.

Basically, if you install Exim and SA from pacman, you’ve already got everything enabled. Filtering spam is done via an Access Control List (the last one in exim.conf). Don’t bother with transports unless you’re sure you want them.

Add spamd to daemons in rc.conf. If you want reject logging, append

-s /var/log/spamd.log -D check

to the string in /etc/config.d/spamd.

uzbl_tabbed.py: commands to FIFO

The list is on line 782 (ATM) of uzbl_tabbed.py. The FIFO location is determined by your settings (top of file for defaults, possibly overridden from config). It’s like this:

782     def parse_command(self, cmd):
783         '''Parse instructions from uzbl child processes.'''
784
785         # Commands ( [] = optional, {} = required )
786         # new [uri]
787         #   open new tab and head to optional uri.
788         # close [tab-num]
789         #   close current tab or close via tab id.
790         # next [n-tabs]
791         #   open next tab or n tabs down. Supports negative indexing.
...

So, to open a new tab in uzbl_tabbed from newsbeuter, you need a script like newtab.sh:

#!/bin/sh
echo "new $1" > `ls -1 /tmp/uzbltabbed_*`

Then call it from newsbeuter – put this in ~.newsbeuter/config:

browser "~/.local/share/uzbl/scripts/newtab.sh %u"