New open source project on work time – git-history-data

Announcing a little open source project that I have built at work and been allowed to publish Freely.

git-history-data analyses a Git source code repository and dumps out data in a form that is easy to analyse.

I wrote an article demonstrating how to use it to find out some interesting information about the codebase of Git itself and got it published on IBM DeveloperWorks Open: Learning about the Git codebase using git-history-data.

Vim as editor for Claws Mail

I got sick of not having Vim as my text editor for emails in Claws Mail but GVim makes my eyes bleed so I wanted proper Vim-in-a-terminal as my editor, which was not particularly straightforward.

The proper incantation was to make a script in my PATH called terminal-vim like this:

#!/bin/bash

mate-terminal --disable-factory -x vim -f "$@"

(gnome-terminal should work similarly if you’re in GNOME.)

and to set it as my external editor in Claws Mail by going to Configuration, Preferences, External Programs, and setting Text Editor to terminal-vim '%s'.

Then under Writing in Preferences, I ticked the box “Automatically launch the external editor” and all is well.

Avoiding postfix error “status=deferred (unable to look up host”

My emails wouldn’t send when I was working from home, giving me this message in /var/log/mail.log:

Nov 11 12:38:16 machinename postfix/smtp[20672]: CF5D6D41CE2: to=, relay=none, delay=14416, delays=14416/0.01/0.07/0, dsn=4.3.5, status=deferred (Host or domain name not found. Name service error for name=relay.example.com type=AAAA: Host not found)

It turned out I was telling postfix not to use DNS to resolve the domain name of my mail relay server. There were several postfix config options I needed to remove to make this work:

# Make sure all of these are commented out or removed!
#default_transport = smtp
#relay_transport = smtp
#inet_protocols = ipv4
#smtp_host_lookup = native

The default values for these options are fine, but the ones shown above stop it working, so remove them or comment out with a # at the beginning of the line.

More at Postfix configuration parameters.