Update log rotation size to dynamic value in ns-log-size script

files/usr/sbin/ns-log-size

@@ -0,0 +1,71 @@
+#!/bin/bash
+#
+# Copyright (C) 2024 Nethesis S.r.l.
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
+# Get the current log rotation size and update it in the rsyslog configuration file
+# Usage: ns-log-size {get|set <size>}
+# Example: ns-log-size get
+# Example: ns-log-size set 104857600
+# the service must be restarted after the size is changed
+
+
+CONFIG_FILE="/etc/rsyslog.conf"
+LOG_ROTATION_LINE=$(grep -E '^\$outchannel log_rotation' "$CONFIG_FILE")
+MIN_SIZE=52428800
+
+get_log_rotation_size() {
+ local size=$(echo "$LOG_ROTATION_LINE" | awk -F', ' '{print $2}')
+ echo "$size (in bytes)"
+}
+
+set_log_rotation_size() {
+ local new_size=$1
+ if [[ ! $new_size =~ ^[0-9]+$ ]]; then
+ echo "Error: Size must be a positive integer."
+ exit 1
+ fi
+
+ # Check if the new size is less than the minimum required size
+ if (( new_size < MIN_SIZE )); then
+ echo "Error: The input size is too low. The minimum value is $MIN_SIZE."
+ exit 1
+ fi
+
+ # Full match from start to end
+ sed -i "s/\(\$outchannel log_rotation,\/var\/log\/messages,[ ]*\)[0-9]\+\([ ]*, \/usr\/sbin\/rotate-messages\)/\1$new_size\2/" "$CONFIG_FILE"
+
+ # Verify if the value was correctly replaced
+ local updated_line
+ updated_line=$(grep -E '^\$outchannel log_rotation' "$CONFIG_FILE")
+ if echo "$updated_line" | grep -q "$new_size"; then
+ echo "Log rotation size updated successfully to $new_size (in bytes)."
+ /etc/init.d/rsyslog restart
+ if [[ $? -ne 0 ]]; then
+ echo "Failed to restart rsyslog service."
+ exit 1
+ fi
+ echo "The rsyslog service has been restarted."
+ else
+ echo "Failed to update log rotation size."
+ exit 1
+ fi
+}
+
+case $1 in
+ get)
+ get_log_rotation_size
+ ;;
+ set)
+ if [[ -z "$2" ]]; then
+ echo "Error: No size provided for set action."
+ exit 1
+ fi
+ set_log_rotation_size "$2"
+ ;;
+ *)
+ echo "Usage: $0 {get|set <size>}"
+ exit 1
+ ;;
+esac