mixandClaude Opus 5.5
599149bf83
Comments only, no behaviour changed. Each main.cf/master.cf parameter the
build sets, the wrapper's and the reload hook's reliance on Postfix 3.7.11
(postfix-script, master.5, postconf.5, cleanup_init.c, smtpd_peer.c,
README_FILES), supervisor 4.2.5 (process.py, options.py, events.rst),
logrotate 3.21.0, OpenDKIM's config, Cyrus SASL's sasldb, rspamd 3.11.1
(milter_headers.lua, multimap, the map watcher), Docker Compose, CoreDNS
and certbot now say where that is written. Measurements already there stay
measurements ("date not recorded" where none was); hand-composed fixtures
say so.
Contradictions left for their own commits: C-P31 cleanup's size limit,
C-P42 master outside supervisor's signal, C-V5/V6 startsecs, C-V10,
C-S3/Q3 sasldb written in place, C-Q4/A1 certbot's symlinks, C-R7 rspamd
skips local clients but the signature routine does not, C-P8, C-R4, C-R12,
C-M7, C-E2, C-K8/K9, C-D1.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
83 lines
3.2 KiB
Bash
83 lines
3.2 KiB
Bash
#!/bin/sh
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# Periodic logrotate for /data/log/mail.log. Rotation renames the file,
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# recreates it (`create 0640 postfix selfpost`, 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 written
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# before the reload is lost. `create` (rather than `nocreate`) matters here
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# beyond timing: a postlogd-triggered recreate lands the file at 0600 owned by
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# postfix, which the unprivileged panel process cannot read — confirmed on a
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# live container (date not recorded), and so in the source: Postfix 3.7.11,
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# src/util/logwriter.c, logwriter_open_or_die(), creates it 0644 under master's
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# umask(077), src/master/master.c — so logrotate must be the one to create it.
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# The reload: Postfix 3.7.11, conf/postfix-script, "logrotate" (mv, then kill
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# -HUP master); master_conf.c, master_config() -> master_restart_service() ->
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# master_status_cleanup(), on which postlogd exits (src/master/dgram_server.c,
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# dgram_server_abort() on MASTER_STATUS_FD), and the next postlogd opens the
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# path anew (src/postlogd/postlogd.c, logwriter_open_or_die()).
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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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# (logrotate 3.21.0-1: debian/rules, --with-state-file-path=/var/lib/logrotate/
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# status. That file is in the container's own filesystem: a recreated container
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# starts without it, and logrotate.c, newState(), records a log it has no state
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# for as rotated today, so the first rotation after a recreate comes a day
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# later.)
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set -eu
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CONFIG=/etc/logrotate.d/mail
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INTERVAL="${LOGROTATE_INTERVAL_SECONDS:-21600}"
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# logrotate refuses configs writable by group or others and exits 0 while
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# ignoring them — fail here so supervisord reports the fault. (logrotate
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# 3.21.0, config.c, readConfigFile(): as root, mode & 0022 gives "Ignoring ...
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# because it is writable by group or others." and returns 0, not an error; a
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# config not owned by root is ignored the same way. "Potentially dangerous
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# mode" is only a warning there, for any mode & 07533 other than 0400 - this
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# loop chooses to treat it as fatal too.)
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logrotate_config_ok() {
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mode=$(stat -c '%a' "$CONFIG")
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mode=${mode#0}
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grp=$(( (mode / 10) % 10 ))
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oth=$(( mode % 10 ))
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case $grp in 2|3|6|7) return 1 ;; esac
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case $oth in 2|3|6|7) return 1 ;; esac
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return 0
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}
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logrotate_config_fatal() {
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echo "logrotate-loop: refusing to run: $CONFIG mode $(stat -c '%a' "$CONFIG") is writable by group or others" >&2
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exit 1
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}
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if ! logrotate_config_ok; then
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logrotate_config_fatal
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fi
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run_logrotate() {
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out=$(logrotate "$CONFIG" 2>&1) || {
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echo "$out" >&2
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return 1
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}
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case "$out" in
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*Ignoring*|*Potentially\ dangerous\ mode*)
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echo "$out" >&2
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logrotate_config_fatal
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;;
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esac
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return 0
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}
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while true; do
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if ! logrotate_config_ok; then
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logrotate_config_fatal
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fi
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if run_logrotate; 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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