Re: [9fans] the JD project: little tiny liinux that is a driver for Plan 9, boots in seconds.

[Paul Lalonde <plalonde@telus.net>]

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Yowza.  Someone slipped something into Ron's coffee!

Ron - any chance of the /dev/fb based drawterm making its way to more  
general distribution?

Thanks,
     Paul

On 20-Dec-06, at 2:19 PM, ron minnich wrote:

> It is called JD for a reason  ...
>
> anyway ...
>
> on sources/xen/xen3/xentest.tgz is the latest.
>
> here is what it does
> boots a minimal linux to a bash prompt. You type
> xend start
> xm create hanska
> this in turn boots a cpu server under xen which tries to mount from an
> fs, which does not exist, but hey ... it can start up a plan 9
> instance. And give it an IP from DHCP. And it tries and fails to mount
> an fs from somewhere. And if finds the block device (sd00). This is
> close.
>
> The linux will nat for you.
>
> In theory, I should be able to mount 9grid.net, have not tried this  
> yet.
>
> The file is a mere 62M compressed (sorry!) but we're trying. I had to
> pull in lots of shit because the xen scripts are a mix of python and
> bash. The bash scripts, if written in python, would not need all the
> shit. Long term, they should all be python, and I am sure that you
> folks are chomping at the bite to rewrite them, python being such a
> readable, simple, easy to bug-insert language (what's the oppose of
> debug? Where you insert a bug just be removing whitespace? maybe embug
> -- for embedding a bug. )
>
> here is my grub.conf entry for it -- see, I'm getting user-friendly
> this time around.
>
> title           tiny horrible xen
> root            (hd0,5)
> kernel          /boot/xen-3.0.3-1-i386.gz
> module          /boot/vmlinuz-2.6.18-3-xen-686 root=/dev/hda6 ro  
> console=tty0
> module          /boot/initrd.img-2.6.18-3-xen-686
>
> So, what did it take to make this work?
>
> Oh, not much. Xen reported hotplug failing, in a way calculated to  
> confuse me.
>
> But, thinks I, I need udev. But, udev won't start without syslog in
> there. Honest, strace doesn't lie.
>
> So, in the end, I added:
> [root@q rminnich]# ls /xentest/etc/init.d/
> functions  syslog
> [root@q rminnich]#
>
> [root@q rminnich]# ls /xentest/etc/
> blkid.tab      dhcpd.conf  hosts    hotplug.d  localtime  passwd
> syslog.conf  xen
> blkid.tab.old  fstab       hotplug  init.d     mtab       services   
> udev
> [root@q rminnich]#
>
> rm /etc/mtab; ln -s /proc/mounts /etc/mtab
>
> [root@q rminnich]# ls /xentest/lib | wc
>    125     125    193
> [root@q rminnich]# ls /xentest/usr/lib
> libsysfs.so.1  libz.so.1  libz.so.1.2.3  python2.4  xen-3.0.3-1
> xen-common  xen-default
> [root@q rminnich]# ls /xentest/bin
> basename  hanska   mv         sed      umount       xenctx
> xenstore-read
> bash      ip       netfix     sh       usleep       xend
> xenstore-rm
> cat       killall  ps         sleep    xc_restore   xenmon.py
> xenstore-write
> cp        less     pygrub     stat     xc_save       
> xenperf           xentop
> cut       logger   readlink   strace   xc_shadow    xenstore- 
> chmod    xentrace
> dhcpd     lomount  readnotes  sync     xenbaked     xenstore-control
> xentrace_format
> drawterm  ls       reset      tcpdump  xen-bugtool  xenstored
> xentrace_setmask
> ed        mkdir    rm         touch    xencons      xenstore-exists
> xentrace_setsize
> expr      mktemp   rmdir      tr       xenconsole   xenstore- 
> list     xm
> grep      mount    runme      true     xenconsoled  xenstore-ls
> [root@q rminnich]# ls /xentest/usr/bin/
> awk  dirname  env  python
> [root@q rminnich]# ls /xentest/sbin/
> brctl        initlog           jfs_fscklog  nologin  udevcontrol
> udevstart.static
> consoletype  insmod            jfs_logdump  pidof    udevd
> udev.static
> depmod       iptables          klogd        sh       udev_run_devd
> getty        iptables-restore  logsave      sulogin  udev_run_hotplugd
> ifconfig     iptables-save     losetup      syslogd  udevsend
> init         isdnlog           modprobe     udev     udevstart
> [root@q rminnich]#
>
>
> and a few other bits. If you think this is a lot, you haven't been
> watching linux lately.
>
> Also, the following simple thing:
> [root@q rminnich]# cat /xentest/bin/runme
> #!/bin/sh -x
> mount -t tmpfs none /tmp
> mount -t tmpfs none /var
> mkdir -p /var/run/xenstored
> mkdir -p /var/log/xen
> mkdir -p /var/log/hotplug
> mkdir -p /var/lib
> mkdir -p /var/lib/dhcp
> touch /var/lib/dhcp/dhcpd.leases
> mkdir -p /var/lock/subsys
> mkdir -p /var/run/xen-hotplug
>
> PATH=$PATH:/usr/lib/xen-3.0.3-1/bin
> export PATH
>
> /etc/init.d/syslog start
> /sbin/udevd&
> modprobe loop
> modprobe bridge
> modprobe netloop
> ipconfig eth0 10.0.0.1 up
> #xend start
> #xm create hanska &
> PATH=$PATH:/mnt
>
> ah, well, we had hoped to have a readonly medium, but we have not
> resolved the problem of a writeable root for plan 9. maybe later. What
> would be very interesting is to not have a root at all, but just boot
> as a terminal from somewhere, but we are not ready yet. But that is
> the Dream.
>
> anyway, 20M are there, 40M need to get there, so give it a few
> minutes. The file when done is this:
>
> [root@q xentest]# ls -l /tmp/xentest.tgz
> -rw-r--r--  1 root root 62174680 Dec 20 15:48 /tmp/xentest.tgz
> [root@q xentest]#
>
> testers welcome, as long as you're not too helpless when confronted
> with Xen ... it's not ready for that yet!
>
> thanks
>
>
> ron

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