09.12.2024 22:25, Wietse Venema via Postfix-users wrote:
Steffen Nurpmeso via Postfix-users:
postfix_status() {
# As postfix does not use stdout but console, no
# postfix__init
# ${prog} status 2>&1
I think that was fixed in Postfix 3.8.
20230308
Cleanup: the postfix(1) and postlog(1) commands now produce
stderr output even when stderr is not connected to a terminal.
This eliminates an inconsistency, and makes these programs
easier to use in some automated procedures. The canonical
example is to capture output from "postmulti -p status" to
figure out which instances are or are not running. Files:
postfix/postfix.c, postlog/postlog.c.
The postlog manpage states:
By default, logging is sent to syslogd(8) or postlogd(8); when
the standard error stream is connected to a terminal, logging
is sent there as well.
I was confused by this description, while trying to understand why,
when the system startup tools captures command output into logs,
there are two messages produced:
Dec 14 09:27:25 gandalf postfix[165466]: postfix/postlog: starting the Postfix
mail system
Dec 14 09:27:25 gandalf postfix/postfix-script[165466]: starting the Postfix
mail system
One is sent by postlog to the syslog, and another is captured from
the stderr/out. It's an interesting effect.
But this only happens when the system startup tools captures the
output, notable any systemd-based system. The complete sequence
looks like:
Dec 14 09:27:25 gandalf systemd[1]: Starting postfix.service - Postfix Mail
Transport Agent (main/default instance)...
Dec 14 09:27:25 gandalf postfix[165466]: postfix/postlog: starting the Postfix
mail system
Dec 14 09:27:25 gandalf postfix/postfix-script[165466]: starting the Postfix
mail system
Dec 14 09:27:25 gandalf postfix/master[165468]: daemon started -- version
3.9.1, configuration /etc/postfix
Dec 14 09:27:25 gandalf systemd[1]: Started postfix.service - Postfix Mail
Transport Agent (main/default instance).
/mjt
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