/dev/.initramfs copy state before switch_root

/dev/.initramfs copy state before switch_root

[Warren Togami]

I have pushed the following changes.

* If netboot, copy /tmp/net.* to /dev/.initramfs/.  Initscripts of your 
distribution or NetworkManager can read the files in this location to be 
aware of prior configured interfaces.  A distribution may choose to do 
something with this information.

* If you specify kernel cmdline "rdcopystate", then all of /tmp/* is 
copied into /dev/.initramfs/.  This could sometimes be useful for 
post-boot examination or debugging.

* net.<interface name>.lease is written containing the DHCP lease, 
because dcbw asked for this for NetworkManager.  Your own tools could 
choose to do something with it or not.

TODO:

* We need something to write out a file like 
/dev/.initramfs/net.eth0.static in the case of a static IP during 
initrd.  I have never used static IP with initrd before.  Are there 
multiple syntaxes to configure static IP?  Others have touched this part 
of the code.

Warren Togami
wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
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Re: /dev/.initramfs copy state before switch_root

[Seewer Philippe]

Warren Togami wrote:
> I have pushed the following changes.
> 
> * If netboot, copy /tmp/net.* to /dev/.initramfs/.  Initscripts of your 
> distribution or NetworkManager can read the files in this location to be 
> aware of prior configured interfaces.  A distribution may choose to do 
> something with this information.
> 
> * If you specify kernel cmdline "rdcopystate", then all of /tmp/* is 
> copied into /dev/.initramfs/.  This could sometimes be useful for 
> post-boot examination or debugging.
> 
> * net.<interface name>.lease is written containing the DHCP lease, 
> because dcbw asked for this for NetworkManager.  Your own tools could 
> choose to do something with it or not.

That's great, thanks!

> TODO:
> 
> * We need something to write out a file like 
> /dev/.initramfs/net.eth0.static in the case of a static IP during 
> initrd.  I have never used static IP with initrd before.  Are there 
> multiple syntaxes to configure static IP?  Others have touched this part 
> of the code.

I don't know if this is really necessary. After all, it just a static 
conf and initscripts can just check if an interface is already up?

Anyway, the syntax to use on the commandline is ip=... See 
http://apps.sourceforge.net/trac/dracut/wiki/commandline for more 
information.

As for a file format, why not ask the NetworkManager people what they'd 
like to have?

Hope that helps
Philippe
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Re: /dev/.initramfs copy state before switch_root

[Warren Togami]

On 06/08/2009 10:58 PM, Seewer Philippe wrote:
> I don't know if this is really necessary. After all, it just a static
> conf and initscripts can just check if an interface is already up?

NetworkManager or initscripts perhaps cannot differentiate between 
checking if it is already up immediately at boot-up or if it is run 
again sometime later.  It is really better for dracut to inform the OS 
explicitly in a uniform manner similar to if dhcp were used.

>
> Anyway, the syntax to use on the commandline is ip=... See
> http://apps.sourceforge.net/trac/dracut/wiki/commandline for more
> information.
>
> As for a file format, why not ask the NetworkManager people what they'd
> like to have?
>

Dan, what file format would you prefer?

Warren Togami
wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
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Re: /dev/.initramfs copy state before switch_root

[Harald Hoyer]

On 06/09/2009 07:18 AM, Warren Togami wrote:
> On 06/08/2009 10:58 PM, Seewer Philippe wrote:
>> I don't know if this is really necessary. After all, it just a static
>> conf and initscripts can just check if an interface is already up?
>
> NetworkManager or initscripts perhaps cannot differentiate between
> checking if it is already up immediately at boot-up or if it is run
> again sometime later. It is really better for dracut to inform the OS
> explicitly in a uniform manner similar to if dhcp were used.

Hmm, but in both cases NetworkManager should just preserve this state. So if no 
dhcp was involved, reading the actual network state (interface and routes) and 
preserving them, should be preferred.

>
>>
>> Anyway, the syntax to use on the commandline is ip=... See
>> http://apps.sourceforge.net/trac/dracut/wiki/commandline for more
>> information.
>>
>> As for a file format, why not ask the NetworkManager people what they'd
>> like to have?
>>
>
> Dan, what file format would you prefer?
>
> Warren Togami
> wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
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Re: /dev/.initramfs copy state before switch_root

[Seewer Philippe]

Warren Togami wrote:
[snip]
> * net.<interface name>.lease is written containing the DHCP lease, 
> because dcbw asked for this for NetworkManager.  Your own tools could 
> choose to do something with it or not.

By the way, why not do this:
---
diff --git a/modules.d/40network/ifup b/modules.d/40network/ifup
index de459c3..8280b73 100755
--- a/modules.d/40network/ifup
+++ b/modules.d/40network/ifup
@@ -70,7 +70,7 @@ do_dhcp() {
     # /sbin/dhclient-script will mark the netif up and generate the online
     # event for nfsroot
     # XXX add -V vendor class and option parsing per kernel
-    dhclient -1 -q -R ${reqs} -pf /tmp/dhclient.$netif.pid -lf /tmp/net.$netif.lease $netif
+    dhclient -1 -q -R ${reqs} -pf /tmp/dhclient.$netif.pid -lf /dev/.initramfs/net.$netif.lease $netif
 }
 
 ip_to_var() {
diff --git a/modules.d/99base/init b/modules.d/99base/init
index fb1a604..eab923e 100755
--- a/modules.d/99base/init
+++ b/modules.d/99base/init
@@ -35,6 +35,7 @@ mknod /dev/null c 1 3
 mknod /dev/ptmx c 5 2
 mknod /dev/console c 5 1
 mkdir /dev/pts
+mkdir /dev/.initramfs/
 mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts >/dev/null 2>&1
 
 # run scriptlets to parse the command line
@@ -139,7 +140,6 @@ for x in "$@"; do
 done
 
 # Copy state
-mkdir /dev/.initramfs/
 if getarg rdcopystate; then
     cp /tmp/* /dev/.initramfs/ >/dev/null 2>&1
 else
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