mix
db1572d7ad
Replaces copytruncate with rename + `postfix reload` (the same mechanism `postfix logrotate` itself uses), closing the up-to-one-second window where copytruncate could drop in-flight delivery lines and leave a send-log row stuck at "queued" forever. logrotate-mail.conf keeps `create 0644 root root` rather than `nocreate` as originally planned: verified on a live container that Postfix recreates the file itself only lazily, on the next write after reload, and at mode 0600 — unreadable by the unprivileged panel process. `create` hands the file back at 0644 immediately after rename, before Postfix ever touches it. logtail.follow() re-drains the old file descriptor once more right before switching to the rotated file, closing the residual gap between the last poll's drain and the rotation check. readLogTail() treats a momentarily missing mail.log as an empty screen rather than a logged error. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
27 lines
1.1 KiB
Bash
27 lines
1.1 KiB
Bash
#!/bin/sh
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# Periodic logrotate for /var/log/mail.log (spec 9, 10). Rotation renames the
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# file, recreates it (`create 0644 root root`, matching a cold container
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# start), then runs `postfix reload` (the same mechanism `postfix logrotate`
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# uses): postlogd keeps writing to the renamed inode until reload, and the
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# panel's log-tailer holds its own descriptor on that inode, so nothing
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# written before the reload is lost. `create` (rather than `nocreate`) matters
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# here beyond timing: a reload-triggered recreate lands the file at 0600,
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# which the unprivileged panel process cannot read — confirmed on a live
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# container — so logrotate must be the one to create it at 0644.
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#
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# logrotate itself only rotates once the configured "daily" period has elapsed
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# (tracked in /var/lib/logrotate/status), so it is safe to invoke this more
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# often than daily — polling merely bounds how late a legitimate rotation runs.
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set -eu
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INTERVAL="${LOGROTATE_INTERVAL_SECONDS:-21600}"
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while true; do
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if logrotate /etc/logrotate.d/mail; then
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:
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else
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echo "logrotate-loop: logrotate failed, will retry after ${INTERVAL}s" >&2
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fi
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sleep "${INTERVAL}"
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done
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