feat: Configurable number of rotated log files (#3907)

CHANGELOG.md

@@ -60,6 +60,11 @@ The most noteworthy change of this release is the update of the container's base
     - `undef` was previously supported as an opt-out with `SA_SPAM_SUBJECT`. This is no longer valid, the equivalent opt-out value is now an empty value (_or rather the omission of this ENV being configured_).
     - The feature to include [`_SCORE_` tag](https://spamassassin.apache.org/full/4.0.x/doc/Mail_SpamAssassin_Conf.html#rewrite_header-subject-from-to-STRING) in your value to be replaced by the associated spam score is no longer available.
 
+### Added
+
+- **Environment Variables:**
+  - `LOGROTATE_COUNT` defines the number of files kept by logrotate ([#3907](https://github.com/docker-mailserver/docker-mailserver/pull/3907))
+
 ### Updates
 
 - **Environment Variables:**

docs/content/config/environment.md

@@ -545,6 +545,12 @@ Changes the interval in which log files are rotated.
 
     This variable can also determine the interval for Postfix's log summary reports, see [`PFLOGSUMM_TRIGGER`](#pflogsumm_trigger).
 
+##### LOGROTATE_COUNT
+
+Defines how many files are kept by logrotate.
+
+- **4** => Number of files
+
 #### SpamAssassin
 
 ##### ENABLE_SPAMASSASSIN

mailserver.env

@@ -346,6 +346,9 @@ REPORT_SENDER=
 # Note: This variable can also determine the interval for Postfix's log summary reports, see [`PFLOGSUMM_TRIGGER`](#pflogsumm_trigger).
 LOGROTATE_INTERVAL=weekly
 
+# Defines how many log files are kept by logrorate
+LOGROTATE_COUNT=4
+
 
 # If enabled, employs `reject_unknown_client_hostname` to sender restrictions in Postfix's configuration.
 #

target/scripts/startup/setup.d/log.sh

@@ -19,13 +19,19 @@ function _setup_logrotate() {
     _dms_panic__invalid_value 'LOGROTATE_INTERVAL' 'Setup -> Logrotate'
   fi
 
+  if [[ ${LOGROTATE_COUNT} =~ ^[0-9]+$ ]]; then
+    _log 'trace' "Logrotate count set to ${LOGROTATE_COUNT}"
+  else
+    _dms_panic__invalid_value 'LOGROTATE_COUNT' 'Setup -> Logrotate'
+  fi
+
   cat >/etc/logrotate.d/maillog << EOF
 /var/log/mail/mail.log
 {
   compress
   copytruncate
   delaycompress
-  rotate 4
+  rotate ${LOGROTATE_COUNT}
   ${LOGROTATE_INTERVAL}
 }
 EOF

target/scripts/startup/setup.d/security/rspamd.sh

@@ -109,7 +109,7 @@ function __rspamd__setup_logfile() {
   compress
   copytruncate
   delaycompress
-  rotate 4
+  rotate ${LOGROTATE_COUNT}
   ${LOGROTATE_INTERVAL}
 }
 EOF

target/scripts/startup/variables-stack.sh

@@ -145,6 +145,7 @@ function __environment_variables_general_setup() {
   VARS[GETMAIL_POLL]="${GETMAIL_POLL:=5}"
   VARS[LOG_LEVEL]="${LOG_LEVEL:=info}"
   VARS[LOGROTATE_INTERVAL]="${LOGROTATE_INTERVAL:=weekly}"
+  VARS[LOGROTATE_COUNT]="${LOGROTATE_COUNT:=4}"
   VARS[LOGWATCH_INTERVAL]="${LOGWATCH_INTERVAL:=none}"
   VARS[LOGWATCH_RECIPIENT]="${LOGWATCH_RECIPIENT:=${REPORT_RECIPIENT}}"
   VARS[LOGWATCH_SENDER]="${LOGWATCH_SENDER:=${REPORT_SENDER}}"