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MEDIUM: config: warn when expose-experimental-directives is used for no reason

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If users start to enable expose-experimental-directives for the purpose
of testing one specific feature, there are chances that the option remains
forever and hides the experimental status of other options.

Let's emit a warning if the option appears and is not used. This will
remind users that they can now drop it, and help keep configs safe for
future upgrades.
This commit is contained in:
Willy Tarreau 2025-10-17 18:15:12 +02:00
parent 80ed9f9dcf
commit 8b7a82cd30
2 changed files with 12 additions and 1 deletions
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5
doc/configuration.txt
View File

@ -2464,7 +2464,10 @@ expose-experimental-directives
breaking them but with no guarantee. For these reasons, these features are
not expected to be supported beyond the release of the next LTS release.
Users who want to try experimental features are expected to upgrade quickly
to benefit from the improvements made to that feature.
to benefit from the improvements made to that feature. In order to know if
this directive is still needed, it's easy: if it is enabled without being
used by any such feature, a warning will be emitted suggesting to turn it
off. So without any warning, it means it's still needed.
external-check [preserve-env]
Allows the use of an external agent to perform health checks. This is

8
src/cfgparse.c
View File

@ -4609,6 +4609,14 @@ init_proxies_list_stage2:
cfgerr += postparser->func();
}
if (experimental_directives_allowed &&
!(get_tainted() & TAINTED_CONFIG_EXP_KW_DECLARED)) {
ha_warning("Option 'expose-experimental-directives' is set in the global section but is "
"no longer used. It is strongly recommended to remove it in order to avoid "
"using an experimental directive by accident in the future.\n");
err_code |= ERR_WARN;
}
if (cfgerr > 0)
err_code |= ERR_ALERT | ERR_FATAL;
out: