Brendan Creane 970cc199fe tstest/natlab/vmtest: add VM coverage for openresolv DNS backend (#20999) ...

* net/dns: export OSConfigurationReadWarnable

A natlab vmtest checks that a node is not reporting this warning. Exporting
the Warnable lets the test take the warning's text from it, instead of
keeping a copy of the wording that could stop matching without failing.

Updates #20825
Updates tailscale/corp#44793

Signed-off-by: Brendan Creane <bcreane@gmail.com>

* tstest/natlab/vmtest: add VM coverage for the openresolv DNS backend

dnsMode() picks one of five Linux DNS backends, and natlab could provision
only systemd-resolved and direct. Add a DNSOpenresolv mode and a VM test for
it, so the backend behind #20825 is covered.

No cloud image ships openresolv and a guest cannot download it, so its two
source files are vendored under testdata and installed with cloud-init's
write_files. openresolv's build is a set of sed substitutions with nothing to
compile, so resolvconf.go does the substitutions in process.

Updates #20825
Updates tailscale/corp#44793

Signed-off-by: Brendan Creane <bcreane@gmail.com>

---------

Signed-off-by: Brendan Creane <bcreane@gmail.com>

2026-09-10 09:12:12 -07:00

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publicdns

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resolvconffile

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resolver

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config.go

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dbus.go

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debian_resolvconf.go

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direct_linux_test.go

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direct_test.go

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direct_unix_test.go

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direct.go

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dns_clone.go

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dns_view.go

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flush_default.go

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flush_windows.go

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ini_test.go

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ini.go

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manager_darwin_test.go

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manager_darwin.go

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manager_default.go

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manager_freebsd.go

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manager_linux_test.go

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manager_linux.go

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manager_openbsd.go

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manager_plan9_test.go

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manager_plan9.go

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manager_solaris.go

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manager_tcp_test.go

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manager_test.go

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manager_windows_test.go

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manager_windows.go

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manager.go

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nm.go

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noop.go

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nrpt_windows.go

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openresolv_test.go

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openresolv.go

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osconfig_test.go

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osconfig.go

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resolvconf-workaround.sh

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resolvconf.go

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resolvconfpath_default.go

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resolvconfpath_gokrazy.go

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resolvd.go

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resolved.go

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utf_test.go

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utf.go

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wsl_windows.go

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