Monthly Archives: January 2010

autocomplete sh: <( compgen -d -- '' ): No such file or directory

Posted by dansketcher on January 15, 2010
Uncategorized / 1 Comment

Not much of a title, I know, but something for fellow stumped google-wanderers..

I’ve been playing around with deprec for automatically provisioning new servers for my Rails applications. However, I hit a strange problem where certain command-line auto-completions did not work; I’d get an error message like this:

$ ls
temp

$ cd [hit tab to get autocomplete]
-sh: <( compgen -d -- '' ): No such file or directory
-sh: <( compgen -f -X  -- '' ): No such file or directory

The confusing thing was that only the unpriviliged user exhibited this behaviour, not the root user.

I tried reinstalling the bash-completion package to no avail (even an aptitude purge then aptitude install did not work). Eventually I came across this rather long post on bugs.debian.org where someone else has the same problem. Essentially it comes down to the unpriviliged user using /bin/sh as the default shell; under these circumstances autocompletion is supposed to not function (although presumably without error). This is despite /bin/sh being a symlink to /bin/bash

The fix, then, is actually quite simple. Change the default shell for all your unprivileged users to bash:

# usermod -s /bin/bash dansketcher

and then when you make new users, make sure you select bash explicitly:

# useradd newuser -m -s /bin/bash

Free year-long SSL Certificate

Posted by dansketcher on January 10, 2010
hosting / No Comments

Just discovered StartSSL’s Free SSL Certificate – 1 year (chained) SSL certificate for free.

I’m not affiliated in any way – I just like free stuff.

Thinking-Sphinx :with => @geodist returns no results

Posted by dansketcher on January 01, 2010
gems, Rails, rant, software development / No Comments

Having just recently started using Thinking Sphinx, I’ve been toying with the geograhical search that it provides to simply do distance-based searches while querying other information. The Geo-searching part of the manual shows how to do searches limiting distance:

# Searching for places within 10km
Place.search "pancakes", :geo => [@lat, @lng],
  :with => {"@geodist" => 0..10_000}
# Searching for places sorted by closest first
Place.search "pancakes", :geo => [@lat, @lng],
  :order => "@geodist ASC, @relevance DESC"

Unfortunately, the first style of query where @geodist is limited in range – when used as-is – does not work I found in my testing that I could order by @geodist as per the second query but when I added the :with range, I had no results.

The solution was actually simple, but really annoying. You have to use Floats instead of Integers for the range numbers! So changing the first query to:

Place.search "pancakes", :geo => [@lat, @lng],
  :with => {"@geodist" => 0.0..10_000.0}

# or more neatly

Place.search "pancakes", :geo => [@lat, @lng],
  :with => {"@geodist" => Range.new(0.0, 10_000.0)}

makes it all work. Now to get someone to update those docs!
Update: Updated!