Hi, Sergey!

Thanks for the patch! LGTM

--
Best regards,
Evgeniy Temirgaleev

> 
> From: Sergey Kaplun <skaplun@tarantool.org>
> To: Sergey Bronnikov <sergeyb@tarantool.org>, Evgeniy Temirgaleev <e.temirgaleev@tarantool.org
> >
> Cc: tarantool-patches@dev.tarantool.org, Sergey Kaplun <skaplun@tarantool.org
> >
> Date: Thursday, July 2, 2026 10:21 PM +03:00
> `os.time()` uses `mktime()` to specify time by the given table.
> `mktime()` produces the call to `tzset()` to determine the system's
> timezone. If the TZ variable does not appear in the environment, the
> system timezone is used. The system timezone is configured by copying,
> or linking, a file in the tzfile(5) format to /etc/localtime. So, if
> this file is omitted (like in RED OS), the errno is set to a non-zero
> value. This leads to the nil returned by the `os.time()` for -1 time
> value.
> 
> This patch skips the test if this file is missed to be sure that we
> don't obtain any false positive failures due to system
> misconfigurations.
> ---
> 
> Branch: https://github.com/tarantool/luajit/tree/skaplun/fix-os-time-test-redos
> 
> Failed workflow: https://github.com/tarantool/tarantool/actions/runs/28585213455/job/84775371860?pr=12886#step:5:20692
> 
> 
> Tested inside the following Docker:
> 
> ===================================================================
> FROM registry.red-soft.ru/ubi8/ubi-minimal:latest
> 
> RUN dnf update -y && \
> dnf install -y cmake vim make git curl gcc g++ gdb man && \
> dnf clean all
> ===================================================================
> 
> | docker build . --tag redos
> | docker run --network=host -ti redos bash
> 
> Then clone LuaJIT and proceed as usual.
> 
> With the patch the test skipped:
> | 1..0 # SKIP Unconfigured timezone rules
> 
> Changes in v2:
> 
> * Skip patch not for RED OS but for all distributions with unconfigured
> timezones (i.e. missing '/etc/localtime').
> 
> .../lj-1470-os-time-epoch-minus-1s.test.lua | 20 ++++++++++++++++++-
> 1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
> b/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
> index dfe1ee11..48c6c3a3 100644
> --- a/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
> +++ b/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
> @@ -1,9 +1,27 @@
> local tap = require('tap')
> 
> +local function unconfigured_timezone()
> + -- `os.time()` uses `mktime()` to specify time by the given
> + -- table. `mktime()` produces the call to `tzset()` to determine
> + -- the system's timezone.
> + -- If the TZ variable does not appear in the environment, the
> + -- system timezone is used. The system timezone is configured by
> + -- copying, or linking, a file in the tzfile(5) format to
> + -- /etc/localtime. So, if this file is omitted, the errno is
> + -- set to a non-zero value. This leads to the nil returned by
> + -- the `os.time()` for -1 time value. Let's skip the test if
> + -- this file is missed to be sure that we don't obtain any false
> + -- positive failures due to system misconfigurations.
> + local f = io.open('/etc/localtime', 'r')
> + return not f
> +end
> +
> -- The test file demonstrates os.time() fail to return -1 time
> -- value.
> -- See also: https://github.com/LuaJIT/LuaJIT/issues/1470.
> -local test = tap.test('lj-1470-os-time-epoch-minus-1s')
> +local test = tap.test('lj-1470-os-time-epoch-minus-1s'):skipcond({
> + ['Unconfigured timezone rules'] = unconfigured_timezone(),
> +})
> 
> test:plan(1)
> 
> --
> 2.54.0
>