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Bug#1121014: dhcpcd-base: Manager forgets iface cmdline opts on CARRIER event

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From	Daniel Gröber <dxld@darkboxed.org>
Newsgroups	linux.debian.bugs.dist
Subject	Bug#1121014: dhcpcd-base: Manager forgets iface cmdline opts on CARRIER event
Date	Wed, 19 Nov 2025 16:10:02 +0100
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Package: dhcpcd-base
Version: 1:10.1.0-11
Severity: important
Forwarded: https://github.com/NetworkConfiguration/dhcpcd/pull/548
X-Debbugs-Cc: dxld@darkboxed.org

Dear Maintainer,

While working on dhcpcd<>ifupdown integration I found that interface
UP/DOWN events (cable re-plugging) can clear options that were passed when
asking the global manager (dhcpcd.service) to start the interface
initially.

This doesn't happen when using per-iface (as used by ifupdown=0.8.44) or
per-iface-per-af.

The attached patch fixes the issue and has more detailed rationale.

My preferred design for future-proof ifupdown<>dhcpcd.service
interoperability relies on this not being broken, I will be uploading an
NMU (1:10.3.0-1.1) to DELAYED/5 soon so my pending ifupdown=0.9 upload will
not regress or have to hack around this.

Thanks,
--Daniel

FYI: Find nomenclature and discussion in
https://lists.debian.org/debian-devel/2025/10/msg00201.html

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Bug#1121014: dhcpcd-base: Manager forgets iface cmdline opts on CARRIER event Daniel Gröber <dxld@darkboxed.org> - 2025-11-19 16:10 +0100
  Bug#1121014: dhcpcd-base: Manager forgets iface cmdline opts on CARRIER event Daniel Gröber <dxld@darkboxed.org> - 2025-11-20 17:40 +0100
  Bug#1121014: dhcpcd-base: Manager forgets iface cmdline opts on CARRIER event Daniel Gröber <dxld@darkboxed.org> - 2025-11-21 10:50 +0100

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