Bug 76684

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Description of problem:
RH8 discontinued pump, which I previously used since it did dynamic DNS updates
when it got its lease.  dhclient is also capable of this, but requires a bit of
configuration.

/etc/sysconfig/network-scripts/ifup should be augmented to automatically
generate a dhclient.conf file for each interface, containing a line like:

send fqdn.fqdn "[[[FOO]]]";

...where the value of "[[[FOO]]]" is fetched from the HOSTNAME variable defined
in /etc/sysconfig/network.

ifup already invokes dhclient to use a device-specific config file, so that much
is easy.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Boot with DHCP enabled.	

Actual Results:  N/A

Expected Results:  N/A

Additional info:

See also bug 76681.  (I refer to that bug in the text below.)

This change would make the dhclient-${IFACE}.conf files auto-generated and
volatile, meaning that this would have to make use of the
/etc/sysconfig-for-user-defined-data model, similar to, say,
/etc/sysconfig/network, or /etc/sysconfig/desktop.  The dhclient-${IFACE}.conf
files might be placed in /var, for example, or perhaps just overwritten in
/etc/dhclient.d/.

I suggest specifically something like this:

/etc/dhclient.d/ - contains generated dhclient.conf files
/etc/sysconfig/dhclient-${IFACE} - contains files containing user config
templates for a given iface

Alternatively, you could just have ifup only generate /etc/dhclient.d/ files if
they don't already exist, but that's hard to check for (since you can't tell if
ifup generated it or if the user did.)

Or, you could argue that this is NOTABUG and just close it, I suppose. :) 
Mostly I'm just interested in having dynamic DNS work out of the box because it
used to on pump -- I view this as a (minor) regression.