With nash's "network --bootproto dhcp" command, the initrd obtains a DHCP lease
and brings up the device.

However, if this device is configured to be brought up at boot time (ONBOOT=yes)
with dhcp (BOOTPROTO=dhcp) by the init scripts, the device is first brought down
and then a new DHCP lease is obtained before bringing the device back up.

This is obviously pretty catastrophic when the root filesystem is on NFS.

The most correct fix seems to be to allow the initrd to pass the lease onto
dhclient, in which case dhclient won't re-configure the device.


Attaching patches which takes a first cut at this.

The mkinitrd patch does the following:

  - Makes libdhcp write out the lease[1]
  - Adds a lame "cp" command to nash
  - Makes setuproot mount a tmpfs on /sysroot/var/lib/initrd
  - Copies the lease to there

The initscripts patch does the following:

  - Creates the /var/lib/initrd dir
  - In ifup-eth, copies any lease for that device from /var/lib/initrd
    for dhclient

[1] - If we're not happy with /var/lib/dhclient/dhclient.leases as the location
for this, we have the following options:

  - change libdhcp's pumpDhcpClassRun() to accept a path for the lease
    and pass that using "-lf <path>" to libdhcp4client's dhcpv4_client()
  - set the PATH_DHCLIENT_DB env var with the path for the lease