main/sysklogd: use cron to rotate logs rather than logrotate

The cronscript parses the syslog.conf and dynamically rotates all
configured log files, while logrotate is a static list.

This way we avoid needing to update the logrotate script each time
you change syslog.conf

1 files changed, 82 insertions, 0 deletions

diff --git a/main/sysklogd/sysklogd.daily b/main/sysklogd/sysklogd.daily
new file mode 100755
index 0000000000..79e85fb468
--- /dev/null
+++ b/main/sysklogd/sysklogd.daily
@@ -0,0 +1,82 @@
+#!/bin/sh
+# This is a shell script replacement for the sysklogd's logrotate cron script
+# and syslogd-listfiles perl script. 
+# Copyright (C) 2008 N. Angelacos for the Alpine Linux project  - GPL2
+
+
+CONF="/etc/syslog.conf"
+
+
+syslogd_listfiles() {
+	# List the target files from syslog.conf
+	
+	local skip="auth"
+	[ "$1" = "--auth" ]  && skip="	"
+
+	# the while loop joins lines that end in "\"
+	# the sed (in order)- 	
+	#		strips comments; 
+	#		collapses spaces/tabs to 1 space; 
+	#		deletes the "-" in front of the filename; 
+	#		deletes lines that have the "skip" facility
+	#		deletes the facility (leaving just the filename)
+	#		deletes lines that are not filenames with leading "/" 
+	while read a ; do echo "$a"; done < $CONF |\
+		 sed -n "/^ *#/D; /^[ 	]*$/D; s/[	 ]\+/ /g; \
+		 s+ -/+ /+g; /^.*\($skip\)[^ ]* /D; \
+		 s/^[^ ]* //; /^[^\\/]/D; P" |\
+		 sort | uniq
+}
+
+# dumb little savelog  - no error checking here 
+savelog () {
+	local group="adm"
+	local mode="644"
+	local user="root"
+	local cycle=2
+	local logfile=""
+
+	# parse args
+	while getopts "g:u:m:c:" opt; do
+		case $opt in 
+			g) group=$OPTARG ;;
+			u) user=$OPTARG ;;
+			m) mode=$OPTARG ;;
+			c) cycle=$OPTARG ;;
+			*) echo "unknown option: $opt" >&2 && return 1;;
+		esac
+	done
+	shift $(( $OPTIND - 1 ))
+	logfile=$1
+
+	# Cycle the logs
+	while [ $cycle -ne 0 ]; do
+		p=$cycle
+		cycle=$(( $cycle - 1 ))
+		a=$logfile.$cycle*
+		b=$( echo $a | sed "s/\.$cycle/\.$p/") 
+		[ -f $a ] && mv $a $b
+	done
+
+	# compress .1 and let .0 be uncompressed
+	[ -f $logfile.1 ] && gzip $logfile.1 
+	[ -f $logfile ] && mv $logfile $logfile.0
+
+	# set permissions
+	chown $user:$group $logfile.* 2>/dev/null
+	chmod $mode $logfile.* 2>/dev/null
+}
+
+
+# Main script
+
+for LOG in $( syslogd_listfiles ); do
+	[ -f $LOG ] && savelog -g adm -m 640 -u root -c 7 $LOG
+done
+
+for LOG in $(syslogd_listfiles --auth); do
+	[ -f $LOG ] && savelog -g adm -m 640 -u root -c 7 $LOG
+done
+
+killall -HUP syslogd
+