git: ifconfig(8): Make lagg creation more fault-tolerant

[Aaron LI]

commit 598a666bccff5d91ec5bc75a130e6b7d19147d49
Author: Aaron LI <aly at aaronly.me>
Date:   Sun Apr 12 21:29:32 2020 +0800

    ifconfig(8): Make lagg creation more fault-tolerant
    
    * Warn, don't exit, when SIOCSLAGGPORT returns an error.
    
      When we exit with an error during lagg creation, a single failed NIC
      (which no longer attaches) can prevent lagg creation and other
      configuration, such as adding an IPv4 address, and thus leave a
      machine unreachable.
    
    * Preserve non-EEXISTS errors for exit status from SIOCSLAGGPORT, in
      case scripts are looking for it. Hopefully this can be extended if
      other parts of ifconfig can allow a "soft" failure.
    
    * Improve the warning message to mention what lagg and what member are
      problematic.
    
    Obtained from FreeBSD:
    https://github.com/freebsd/freebsd/commit/dde41c97866152e8c7eb1f52f07e3e5ac43b2652
    https://reviews.freebsd.org/D15046

Summary of changes:
 sbin/ifconfig/ifclone.c  |  5 +++--
 sbin/ifconfig/ifconfig.c |  5 +++--
 sbin/ifconfig/ifconfig.h |  1 +
 sbin/ifconfig/ifgroup.c  |  4 ++--
 sbin/ifconfig/iflagg.c   | 14 +++++++++++---
 5 files changed, 20 insertions(+), 9 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/598a666bccff5d91ec5bc75a130e6b7d19147d49


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