[OpenIndiana-discuss] DHCP auto-configuration for local zones and sysidcfg

[Jim Klimov]

It is nice talking to oneself, we make a smart and interesting
couple ;) (I do hope some experts would add to this thread)

Apparently, the "quick fix" in smf_netstrategy which just fully
removes the special handling for local zones is a flawed approach.
There are other scripts which seemingly expect local zones to have
$_INIT_NET_STRATEGY==none so this is a case for more careful
revision.

In particular, with the workaround in place, it seems that the
`zonename` or `uname -n` are no longer consulted to construct
the /etc/nodename file (or provide the value on the fly if the
file is absent/empty) to ultimately set the hostname, so the
zone came up as "unknown" on at least one test... For details
see /lib/svc/method/identity-node :)

Adding some code to the "dhcp" case seems to help (only the
first line was originally present):
---
# For non-global zones, fall back to the `uname -n` value provided by the
# kernel if /etc/nodename does not exist, as is expected on an initial boot.
#

smf_netstrategy

case "$_INIT_NET_STRATEGY" in
         "dhcp") hostname=`/sbin/dhcpinfo Hostname`
                 if [ -z "$hostname" ]; then
                         if smf_is_globalzone; then
                                 hostname=`/sbin/hostconfig -h -p 
bootparams`
                         else
                                 hostname=`/sbin/zonename`
                         fi
                 fi ;;
---

Use of "uname -n" as proposed by the script's comments seems
pointless, but maybe that's because I'm testing after the name
"unknown" has got assigned during zone startup:

root at unknown:~# hostname
unknown
root at unknown:~# zonename
build-ss12sun
root at unknown:~# uname -n
unknown

An arguable bonus is to add these lines someplace there:
                 [ ! -z "$hostname" -a ! -s /etc/nodename ] && \
                         echo "$hostname" > /etc/nodename &&
                         /usr/bin/chmod 644 /etc/nodename
If we discovered a "$hostname" and the "/etc/nodename" was
empty or nonexistent, seed that file with the name we found.
Q: Should this be done at all, and in the identity-node SMF
method script in particular?

On a side note, I found that `zonename -t` should return the
ip-type (shared or exclusive) which can help me make a more
"educated guess" crafting the workaround...

Good night,
//Jim Klimov