✎ soc:2009:pravin:journal:pxeknifedsl

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====== Adding DSL to pxeKnife ======
Initially, I will add just menu entry, kernel and initramfs. I plan to modify initramfs later to support http mounting.

===== HTTP mounting =====
This will involve following things.
  - Add FUSE module to initramfs.
  - Add httpfs to initramfs.
  - Add losetup to initramfs.
  - Do mounting.

===== Useful links =====
  - Useful link regarding knoppix [[http://www.knoppix.net/wiki/Knoppix_Remastering_Howto]]
  - Reference for modifying minirt24 [[http://www.knoppix.net/wiki/Knoppix_Remastering_Howto#For_5.3.1_the_file_system_in_minirt_changed_to_ramfs.]]
===== Following Example =====
Following the example from [[http://httpfs.sourceforge.net/net_boot.htm]], but facing few problems.

  - httpfs is failing with error 
<code>
fusermount: failed open /dev/fuse : no such file or directory
</code>
When I did //ls// on ///dev/fuse// I got following output
<code>
/dev/fuse ??
</code>
Note: the //ls// used in this case is from initramfs and hence may not handle extreme cases properly.\\

==== Solution ====
It seems, I need to create ///dev/fuse// myself.
When I did 
<code>
# ls -l /KNOPPIX/dev/fuse
crw-rw-rw- 1 root root   10, 229 May 22 2006 /KNOPPIX/dev/fuse
</code>
and created the node with
<code>
mknod fuse c 10 229
</code>
with this, I am able to mount the remote KNOPPIX.

===== loading KNOPPIX over HTTP  =====
if I start DSL and if does not find the KNOPPIX anywhere, then it gives a emergency shell.
I have written a following script that can be run from that shell and it will load the KNOPPIX on /cdrom/
<code>
#!/static/sh
insmod /modules/crc32.o
insmod /modules/8390.o 
insmod /modules/mii.o 
insmod /modules/ne2k-pci.o 
insmod /modules/pcnet32.o 
insmod /modules/r8169.o 
insmod /modules/e100.o 
insmod /modules/e1000.o 
insmod /modules/sis900.o 
insmod /modules/via-rhine.o 
insmod /modules/8139too.o 
insmod /modules/af_packet.o
ifconfig lo 127.0.0.1 up
ifconfig eth0 up
udhcpc -s /static/udhcpc.sh 1
insmod /modules/fuse.o
echo "testing networking"
mkdir /ntest
httpfs http://145.116.233.189/reach /ntest
echo "checking content"
cat /ntest/reach


echo "mounting KNOPPIX"
mkdir /cdrom/KNOPPIX
httpfs http://145.116.233.189/KNOPPIX /cdrom/KNOPPIX
</code>

This script is invoked automatically from linuxrc.\\
I have also added the busybox in ///static/busybox// and it supports meny commands.\\
Networking can be tested with __wget__ but one need to give IP address as URL's are not supported right now.

<code>
# wget http://145.116.233.189/reach
# cat reach

# mount
rootfs / rootfs rw 0 0
/dev/root.old / ext2 rw 0 0
/proc /proc proc rw 0 0
/dev/pts /dev/pts devpts rw 0 0
httpfs /ntest fuse rw,nosuid,nodev,user_id=0,group_id=0 0 0
httpfs /cdrom fuse rw,nosuid,nodev,user_id=0,group_id=0 0 0
</code>
It shows that KNOPPIX is available and __networking__ is working fine\\

===== Mounting the KNOPPIX =====

Now, one of the question is when do I call loader.sh from within linuxrc?\\
Here is the code for [[http://pastebin.com/f265d01b0|linuxrc]]\\
My guess is that I just need to find correct place, and then it should happen automatically.\\

Finally, I got it working.
the modified __linuxrc__ file is [[http://pastebin.com/f5eb77a27|here]].\\
and latest one which works with [http://rom.etherboot.org/share/pravin/pxeknife/]] is [[http://paste.etherboot.org/?page=view&id=1244928477|here]] 

===== Test the linux over HTTP =====

 [http://rom.etherboot.org/share/pravin/pxeknife/]]

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