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Re: [Xen-devel] [PATCH] pypxeboot bootloader


At 11:13 +0000 on 05 Feb (1170673998), Stephen Childs wrote:
> As promised on Friday here is the patch for the pypxeboot bootloader. It 
> would be great if someone could try it out and give me some feedback.

First impressions: this looks really useful but has a few rough edges
that need to be knocked off.  (I haven't had a chance to try this on a
real machine yet.)

> +for line in udhcplines:
> +    s = line.strip()
> +    f = s.split()
> +
> +    if s[0]=='{' and s[-1]=='}':
> +        dhcpinfo=eval(s, {"__builtins__" : {}})
> +        for k in dhcpinfo:
> +            dhcpinfo[k]=dhcpinfo[k].strip()

Executing the results of programs scares me.  Could you just parse it?

> +ipaddr=dhcpinfo['ip']
> +ipaddrlist=ipaddr.split('.')
> +hexip=commands.getstatusoutput("/usr/bin/gethostip -x "+ipaddr)[1]

This requires syslinux to be installed on the Xen host, and isn't 
hard to do by hand: "%2.2x%2.2x%2.2x%2.2x" % tuple(map (int, ipaddrlist))
(I'm sure more heavyweight python hackers can correct my style.)

> +tmpdir="/var/lib/xen/"
> +
> +os.chdir(tmpdir)
> +commandstr="tftp -c get "+servaddr+":pxelinux.cfg/"+hexip
> +#print "running command "+commandstr
> +getpxeres=commands.getstatusoutput(commandstr)

You'll need to be more careful with temporary file names -- here at
least the filename is unique to the guest (we hope!) but for the kernel
etc., two boots could clash.  Also, you don't seem to remove the
downloaded config files.



Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, XenSource UK Limited
Registered office c/o EC2Y 5EB, UK; company number 05334508

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