Hack-A-N900/First Steps: Unterschied zwischen den Versionen

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K (Add extras-testing to /etc/apt/sources.list)
Zeile 77: Zeile 77:
apt-get install bash coreutils-gnu grep-gnu tar-gnu wget vim
apt-get install bash coreutils-gnu grep-gnu findutils-gnu tar-gnu wget vim
Zeile 118: Zeile 118:
alias fgrep='gfgrep'
alias fgrep='gfgrep'
=== Update Kernel ===
Add tesing repositories to /etc/apt/sources.list:
  deb http://repository.maemo.org/extras/ fremantle free
  deb-src http://repository.maemo.org/extras/ fremantle free
  deb http://repository.maemo.org/extras-testing/ fremantle free 
  deb-src http://repository.maemo.org/extras-testing/ fremantle free
apt-get update
apt-get install kernel-flasher-maemo kernel-modules-maemo
cross your thumbs now.. (you backed up before right?)
=== Create unionfs / chroot overlay filesystem for development ===
Create a 2 GB file on /home/user/MyDocs/sandbox/fs.img
  mkdir /home/user/MyDocs/sandbox/
  cd /home/user/MyDocs/sandbox/
  dd if=/dev/zero of=fs.img bs=1M count=1 seek=2048
  mkfs.ext2 fs.img
Get the shiny overlay/chroot shellscript
  wget http://metalab.at/wiki/images/d/d8/Chroot-unionfs.sh  '''WARNING the link might be different now look here: [[Bild:Chroot-unionfs.sh]]'''
  mv chroot-unionfs.sh /sbin/chroot-unionfs
  chmod +x /sbin/chroot-unionfs
This script doeas some magic including
* loading the dm-loop kernel module (for /dev/loop? devices)
* overlaying the unionfs filesystem
* mounting all needed filesystem folders inside the unionfs
* chroot()'ing inside
It is started like this:
bash /sbin/chroot-unionfs -v -t /home/user/MyDocs/sandbox/fs.img
Read the source to find out about command line parameters like -t for testing and others..
If this script is successful you should find yourself in a chrooted environment inside the unionfs
ls /CHROOTED    # it should be here!
  ls /CHROOTED  # it should be gone!

Version vom 17. April 2010, 04:28 Uhr

WARNING: That's where the pleasure and pain of N900 starts. How much pleasure and/or pain depends highly on how familiar you are with linux. So make sure you know how to accomplish simple administrative tasks via a root shell without bricking your system and do regular backups.

Root Access

Start "Application Manager", install package "rootsh" and "OpenSSH Client and Server"

Open "X-Terminal" on your N900.

Gain root access:

sudo gainroot

Add extras-testing to /etc/apt/sources.list

deb http://repository.maemo.org/extras-testing/ fremantle free non-free
deb-src http://repository.maemo.org/extras-testing/ fremantle free

Update apt cache:

apt-get update


Connect the n900 via usb to your pc and select "PC Suite Mode".

On your N900:

ifup usb0
ifconfig usb0

On your PC:

ifup usb0
ifconfig usb0

Please refer to http://wiki.maemo.org/N900_USB_networking for a complete guide.


Install OpenSSH client and server:

apt-get install openssh

Generate ssh key:


From this point it's more convenient to work remotely via ssh.

Copy the generated private key to your PC.

scp root@ ~/.ssh/id_rsa_n900

Put the public key to the right place:

ssh root@ "mv /root/.ssh/id_rsa.pub /root/.ssh/authorized_keys"

Log on to your N900:

ssh -i ~/.ssh/id_rsa_n900 root@

change /etc/sshd_config to denied password authentication:

# Change to no to disable tunnelled clear text passwords
PasswordAuthentication no

Install essential tools

apt-get install bash coreutils-gnu grep-gnu findutils-gnu tar-gnu wget vim

Change shell in /etc/passwd to bash:


NOTE: Maemo ignores shebangs for shells and always executes shell scripts in busybox. You need to pass the script explicitly to any other shell:

bash ./test.sh

WARNING: Don't try to relink /bin/sh to /bin/bash. You system won't boot and you will have to reflash the device.

NOTE: Gnu coreutils and gnu grep are prefixed with the letter 'g'. Therefore you need to call
to use gnu ls. For some third party scripts/builds to work properly you might need to create symlinks for the gnu tools to be used.


ln -s /usr/bin/ggrep /usr/bin/grep

You might also create bash aliases for gnu utils.

$HOME/.bashrc aliases example:

# alias to gnu ls instead of busybux
alias ls='gls --color=auto'

alias ll='ls -l'
alias la='ls -la'
alias md='mkdir'
alias rd='rmdir'

# aliases to gnu grep instead of busybux
alias grep='ggrep'
alias egrep='gegrep'
alias fgrep='gfgrep'