16.12.2024 17:28, Tomasz Pala via Postfix-users wrote:
On 2024-12-16 10:36, Michael Tokarev via Postfix-users wrote:
Calling tzset() before chroot() is not useful in glibc. Because while glibc
caches the /etc/localtime values to avoid the need to re-read it on each
use, it also *resets* the cached values back to defaults if it doesn't find
/etc/localtime on the next use.
Would storing the value in TZ variable before chroot() help dealing with
this?
Yes and no. $TZ can be set to local time offset from UTC or a rule describing
such an offset -- TZ="NZST-12:00:00NZDT-13:00:00,M10.1.0,M3.3.0" (from man 3
tzset).
With this, no /etc/localtime is considered. Or TZ can point to a file, like
TZ=:Pacific/Auckland - in which case the value is read from
/usr/share/zoneinfo/Pacific/Auckland file, which is checked in chroot too.
I dunno if lack of this file in chroot will cause any issues though - but this
should be enough already to just copy /etc/localtime to the chroot and be done
with it (it's a small file which isn't updated often).
/mjt
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