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BUG/MEDIUM: startup: fix zero-warning mode 

Let's check the second time a global counter of "ha_warning" messages, if
zero-warning is set. And let's do this just before forking. At this moment we
are sure, that we've already done all init operations, where we could emit
"ha_warning", and we still have stderr fd opened.

Even with the second check, we could lost some late and rare warnings
about failing to drop supplementary groups and about re-enabling core dumps.
Notes about this are added into 'zero-warning' keyword description.
This commit is contained in:
Valentine Krasnobaeva 2024-07-17 18:40:41 +02:00 committed by Willy Tarreau
parent beaa0e1635
commit fcd4bf54c8
2 changed files with 20 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
doc/configuration.txt
View File

@ -4176,11 +4176,18 @@ quiet
zero-warning
When this option is set, HAProxy will refuse to start if any warning was
emitted while processing the configuration. It is highly recommended to set
this option on configurations that are not changed often, as it helps detect
subtle mistakes and keep the configuration clean and forward-compatible. Note
that "haproxy -c" will also report errors in such a case. This option is
equivalent to command line argument "-dW".
emitted while processing the configuration and applying it. It means that
warnings about bad combinations of parameters, warnings about very high
limits that couldn't be set, and so on, make the process exit with an error
during startup. A few late startup warnings cannot be caught by this option,
such as the failure to drop supplementary groups when changing the group ID
in "daemon" or "master-worker" modes, or the failure to mark the process
dumpable after the fork(). This option does not catch warnings emitted at
runtime. It is highly recommended to set this option on configurations that
are not changed often, as it helps to detect subtle mistakes and keep the
configuration clean and forward-compatible. Note that "haproxy -c" will also
report errors in such a case. This option is equivalent to command line
argument "-dW".
3.4. Userlists

8
src/haproxy.c
View File

@ -3485,6 +3485,14 @@ int main(int argc, char **argv)
clock_adjust_now_offset();
ready_date = date;
/* catch last warnings, which could be produced while adjusting limits
* or preallocating fds
*/
if (warned & WARN_ANY && global.mode & MODE_ZERO_WARNING) {
ha_alert("Some warnings were found and 'zero-warning' is set. Aborting.\n");
exit(1);
}
if (global.mode & (MODE_DAEMON | MODE_MWORKER | MODE_MWORKER_WAIT)) {
int ret = 0;
int in_parent = 0;