Page 334 - Hacking Roomba

Chapter 14 — Putting Linux on Roomba 315

1 root S 360 0 0.0 2.5 init
62 root S 344 1 0.0 2.3 syslogd
309 root S 344 1 0.0 2.3 crond
2149 root S 332 1 0.0 2.3 wifi
64 root S 304 1 0.0 2.1 klogd
301 root S 260 1 0.0 1.8 telnetd

And you can run other common Linux programs like netstat, ifconfig, and ps. If you’re
familiar with Linux, you’ll find most of the low-level administration and inspection tasks
available to you. For example, the entire /proc virtual file system exists to give you visibility into
the running Linux kernel.
Even writing little shell scripts on the command line is possible:
root@OpenWrt:~# while [ 1 ] ; do
> echo “OpenWrt is the best!”
> sleep 1
> done
OpenWrt is the best!
OpenWrt is the best!
OpenWrt is the best!

The ipkg Packaging System
You’ve no doubt noticed the clock is wrong. The easiest way to fix that is to get an NTP client
from the ipkg repository. Ipkg is a code packaging and installation technology, a package
repository, and a command line program. It takes away a lot of the drudgery of installing new
software. Listing 14-1 shows a typical interaction with the ipkg command. If you’re familiar
with other network-based packaging systems like ports, yum, or apt-get, using ipkg will be
immediately familiar to you.

Listing 14-1: Using ipkg to Find and Install ntpclient

root@OpenWrt:~# ipkg update
Downloading
http://downloads.openwrt.org/whiterussian/packages/Packages
Updated list of available packages in /usr/lib/ipkg/lists/ i
whiterussian
Downloading http://downloads.openwrt.org/whiterussian/ i
packages/non-free/Packages
Updated list of available packages in /usr/lib/ipkg/lists/ i
non-free
Successfully terminated.
root@OpenWrt:~# ipkg list | grep ntp
ntpclient - 2003_194-2 - NTP client for setting system time
from NTP servers.
openntpd - 3.7p1-1 - OpenNTPD is a FREE, easy to use
implementation of NTP
Continued