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logger: always update header when read from stdin
The current code updates the header only when the priority has been changed. It's incorrect because wanted is a valid header or each entry (don't forget that logger for stdin use-case is used in pipe to log long-time running processes). This patch also fixes the initial timestamp; it was originally generated on logger startup, it now generates the header on the first message. $ (sleep 2; date; sleep 2; date; sleep 2; date) | logger --stderr --no-act old: <13>Nov 1 10:42:14 kzak: Tue Nov 1 10:42:16 AM CET 2022 <13>Nov 1 10:42:14 kzak: Tue Nov 1 10:42:18 AM CET 2022 <13>Nov 1 10:42:14 kzak: Tue Nov 1 10:42:20 AM CET 2022 new: <13>Nov 1 10:19:02 kzak: Tue Nov 1 10:19:02 AM CET 2022 <13>Nov 1 10:19:04 kzak: Tue Nov 1 10:19:04 AM CET 2022 <13>Nov 1 10:19:06 kzak: Tue Nov 1 10:19:06 AM CET 2022 Fixes: #1866 Signed-off-by: Karel Zak <kzak@redhat.com>
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