git: installer(8): Refactor vars handling to avoid writing duplicates

[Aaron LI]

commit 77836144e5fad1ea71c381e38d33caea8ba1be66
Author: Aaron LI <aly at aaronly.me>
Date:   Thu Feb 19 18:26:41 2026 +0800

    installer(8): Refactor vars handling to avoid writing duplicates
    
    config_vars_write() appends the in-memory vars to the target config
    file.  fn_assign_hostname_domain() fn_assign_ip() previously both read
    the 'resolv.conf' and then write the updated vars, resulting duplicate
    items being written to 'resolv.conf'.
    
    Refactor the vars handling to start with empty 'rc_conf' and
    'resolv_conf' vars, adjust the above configure functions to add/set
    variables, and only write the config files once at the end.

Summary of changes:
 usr.sbin/installer/dfuibe_installer/flow.c         |  55 ++++++---
 usr.sbin/installer/dfuibe_installer/fn.h           |   1 +
 usr.sbin/installer/dfuibe_installer/fn_configure.c | 136 +++++++++------------
 usr.sbin/installer/dfuibe_installer/fn_install.c   |   8 +-
 4 files changed, 105 insertions(+), 95 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/77836144e5fad1ea71c381e38d33caea8ba1be66


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