Merge pull request #94 from MegaV0lt/master

Include detection of OpenRC (Gentoo Linux) and automatically (un)install files

README.md

@@ -1,5 +1,5 @@
 # Log2Ram
-Like ramlog for systemd (on debian 8 jessie for example).
+Like ramlog for systemd (on debian 8 jessie for example). Adapted to detect OpenRC init-system when running on Gentoo-Linux (Hopefully). For now only Systemd and OpenRC can be handled.
 
 Usefull for **RaspberryPi** for not writing on the SD card all the time. You need it because your SD card doesn't want to suffer anymore!
 
@@ -35,7 +35,7 @@ _____
 **REBOOT** before installing anything else (for example apache2)
 ## Upgrade
 
-You need to stop log2ram (`service log2ram stop`) and start the [install](#install).
+You need to stop log2ram (`service log2ram stop` with systemd or `rc-service log2ram stop` with OpenRC) and start the [install](#install).
 
 ## Customize
 #### variables :

install.sh

@@ -1,18 +1,46 @@
 #!/usr/bin/env sh
 
-systemctl -q is-active log2ram  && { echo "ERROR: log2ram service is still running. Please run \"sudo service log2ram stop\" to stop it."; exit 1; }
-[ "$(id -u)" -eq 0 ] || { echo "You need to be ROOT (sudo can be used)"; exit 1; }
+[ "$(id -u)" -eq 0 ] || { echo 'You need to be ROOT (sudo can be used)' ; exit 1 ;}
 
+. /log2ram.conf  # Include config to check if size is enought (See below) 
+
+# See if we can find out the init-system
+echo 'Try to detect init and running log2ram service...'
+if [ "$(systemctl --version 2> /dev/null)" != '' ] ; then
+  INIT='systemd'
+elif [ "$(rc-service --version 2> /dev/null)" != '' ] ; then
+  INIT='openrc'
+fi
+
+case "$INIT" in
+  systemd)
+    systemctl -q is-active log2ram  && { echo 'ERROR: log2ram service is still running. Please run "sudo service log2ram stop" to stop it.' ; exit 1 ;} ;;
+  openrc)
+    rc-service log2ram status >/dev/null 2>&1  && { echo 'ERROR: log2ram service is still running. Please run "sudo rc-service log2ram stop" to stop it.' ; exit 1 ;} ;;
+  *) echo 'ERROR: could not detect init-system' ; exit 1
+  ;;
+esac
+
+echo "Installing log2ram for $INIT init-system"
 # log2ram
 mkdir -p /usr/local/bin/
-install -m 644 log2ram.service /etc/systemd/system/log2ram.service
 install -m 755 log2ram /usr/local/bin/log2ram
 install -m 644 log2ram.conf /etc/log2ram.conf
 install -m 644 uninstall.sh /usr/local/bin/uninstall-log2ram.sh
-systemctl enable log2ram
+if [ "$INIT" = 'systemd' ] ; then
+  install -m 644 log2ram.service /etc/systemd/system/log2ram.service
+  systemctl enable log2ram
+elif [ "$INIT" = 'openrc' ] ; then
+  install -m 755 log2ram.initd /etc/init.d/log2ram
+  rc-update add log2ram boot
+fi
 
 # cron
-install -m 755 log2ram.cron /etc/cron.daily/log2ram
+if [ "$INIT" = 'systemd' ] ; then
+  install -m 755 log2ram.cron /etc/cron.daily/log2ram
+elif [ "$INIT" = 'openrc' ] ; then
+  install -m 755 log2ram.openrc_cron /etc/cron.daily/log2ram
+fi
 install -m 644 log2ram.logrotate /etc/logrotate.d/log2ram
 
 # Remove a previous log2ram version
@@ -21,5 +49,11 @@ rm -rf /var/log.hdd
 # Make sure we start clean
 rm -rf /var/hdd.log
 
-echo "#####         Reboot to activate log2ram         #####"
-echo "##### edit /etc/log2ram.conf to configure options ####"
+# Check if var SIZE is sufficient and show a warning when too small
+if [ -n "$(du -sh -t "$SIZE" /var/log | cut -f1)" ] ; then  # /var/log should be ok on all systems
+  echo 'WARNING: Variable SIZE in /etc/log2ram.conf is too small to store the /var/log!'
+  echo 'Actual size of /var/log is:' ; du -sh /var/log
+fi
+
+echo '#####         Reboot to activate log2ram!         #####'
+echo '##### Edit /etc/log2ram.conf to configure options #####'

log2ram

@@ -2,45 +2,47 @@
 
 . /etc/log2ram.conf
 
-HDD_LOG=/var/hdd.log
-RAM_LOG=/var/log
+HDD_LOG='/var/hdd.log'
+RAM_LOG='/var/log'
 
-LOG_NAME="log2ram.log"
+LOG_NAME='log2ram.log'
 LOG2RAM_LOG="${RAM_LOG}/${LOG_NAME}"
 LOG_OUTPUT="tee -a $LOG2RAM_LOG"
+printf -v NOW '%(%F %H:%M:%S)T' -1 || NOW="$(date '+%F %H:%M:%S')"  # Actual date and time (date as fallback)
 
 isSafe () {
-    [ -d $HDD_LOG/ ] || echo "ERROR: $HDD_LOG/ doesn't exist! Can't sync."
-    [ -d $HDD_LOG/ ] || exit 1
+    [ ! -d "$HDD_LOG/" ] && { echo "ERROR: $HDD_LOG/ doesn't exist! Can't sync." ; exit 1 ;}
 }
 
 syncToDisk () {
     isSafe
 
+    echo "==> $NOW - Syncing to disk" >> $LOG2RAM_LOG
     if [ "$USE_RSYNC" = true ]; then
         rsync -aXv --inplace --no-whole-file --delete-after $RAM_LOG/ $HDD_LOG/ 2>&1 | $LOG_OUTPUT
     else
-        cp -rfup $RAM_LOG/ -T $HDD_LOG/ 2>&1 | $LOG_OUTPUT
+        cp -rfupv $RAM_LOG/ -T $HDD_LOG/ 2>&1 | $LOG_OUTPUT
     fi
 }
 
 syncFromDisk () {
     isSafe
 
-    if [ ! -z "$(du -sh -t "$SIZE" $HDD_LOG/ | cut -f1)" ]; then
+    if [ -n "$(du -sh -t "$SIZE" $HDD_LOG/ | cut -f1)" ]; then
         echo "ERROR: RAM disk too small. Can't sync."
         umount -l $RAM_LOG/
         umount -l $HDD_LOG/
         if [ "$MAIL" = true ]; then
-            echo "LOG2RAM : No place on RAM anymore, fallback on the disk" | mail -s 'Log2Ram Error' root;
+            echo 'LOG2RAM : No place on RAM anymore, fallback on the disk' | mail -s 'Log2Ram Error' root;
         fi
         exit 1
     fi
 
+    echo "==> $NOW - Syncing from disk" >> $LOG2RAM_LOG
     if [ "$USE_RSYNC" = true ]; then
         rsync -aXv --inplace --no-whole-file --delete-after $HDD_LOG/ $RAM_LOG/ 2>&1 | $LOG_OUTPUT
     else
-        cp -rfup $HDD_LOG/ -T $RAM_LOG/ 2>&1 | $LOG_OUTPUT
+        cp -rfupv $HDD_LOG/ -T $RAM_LOG/ 2>&1 | $LOG_OUTPUT
     fi
 }
 
@@ -52,29 +54,29 @@ wait_for () {
 
 createZramLogDrive () {
 	# Check Zram Class created
-	if [ ! -d "/sys/class/zram-control" ]; then
+	if [ ! -d '/sys/class/zram-control' ]; then
 		modprobe zram
-		RAM_DEV='0'
+		RAM_DEV=0
 	else
-		RAM_DEV=$(cat /sys/class/zram-control/hot_add)
+		RAM_DEV="$(cat /sys/class/zram-control/hot_add)"
 	fi
-	echo ${COMP_ALG} > /sys/block/zram${RAM_DEV}/comp_algorithm
-	echo ${LOG_DISK_SIZE} > /sys/block/zram${RAM_DEV}/disksize
-	echo ${SIZE} > /sys/block/zram${RAM_DEV}/mem_limit
-	mke2fs -t ext4 /dev/zram${RAM_DEV}
+	echo "$COMP_ALG" > "/sys/block/zram${RAM_DEV}/comp_algorithm"
+	echo "$LOG_DISK_SIZE" > "/sys/block/zram${RAM_DEV}/disksize"
+	echo "$SIZE" > "/sys/block/zram${RAM_DEV}/mem_limit"
+	mke2fs -t ext4 "/dev/zram${RAM_DEV}"
 }
 
 case "$1" in
   start)
-      [ -d $HDD_LOG/ ] || mkdir $HDD_LOG/
+      [ ! -d "$HDD_LOG/" ] && mkdir $HDD_LOG/
       mount --bind $RAM_LOG/ $HDD_LOG/
       mount --make-private $HDD_LOG/
       wait_for $HDD_LOG
 	if [ "$ZL2R" = true ]; then
 		createZramLogDrive
-		mount -t ext4 -o nosuid,noexec,nodev,user=log2ram /dev/zram${RAM_DEV} ${RAM_LOG}/
+		mount -t ext4 -o nosuid,noexec,nodev,user=log2ram "/dev/zram${RAM_DEV}" ${RAM_LOG}/
 	else
-		mount -t tmpfs -o nosuid,noexec,nodev,mode=0755,size=${SIZE} log2ram $RAM_LOG/
+		mount -t tmpfs -o "nosuid,noexec,nodev,mode=0755,size=${SIZE}" log2ram $RAM_LOG/
 	fi
       wait_for $RAM_LOG
       syncFromDisk
@@ -95,7 +97,7 @@ case "$1" in
       ;;
 
   *)
-      echo "Usage: log2ram {start|stop|write}" >&2
+      echo 'Usage: log2ram {start|stop|write}' >&2
       exit 1
       ;;
 esac

log2ram.conf

@@ -5,7 +5,8 @@
 # If it's not enough, log2ram will not be able to use ram. Check you /var/log size folder.
 # The default is 40M and is basically enough for a lot of applications.
 # You will need to increase it if you have a server and a lot of log for example.
-SIZE=40M
+# Note that tmpfs doesn't reserve this memory, but allocates only the needed memory.  
+SIZE=100M
 
 # This variable can be set to true if you prefer "rsync" rather than "cp".
 # I use the command cp -u and rsync -X, so I don't copy the all folder every time for optimization.

log2ram.initd

@@ -0,0 +1,32 @@
+#!/sbin/openrc-run
+
+# Init-Skript for log2ram
+# This skript is designed to work on Gentoo Linux with OpenRC
+
+description="Store logfiles in RAM to minimize writes to disk."
+
+# Command is available when the service is started
+extra_started_commands="write"
+
+depend() {
+  after localmount
+  before logger
+}
+  
+start() {
+  ebegin "Starting Log2Ram"
+    /usr/local/bin/log2ram start
+  eend $?
+}
+  
+stop() {
+  ebegin "Stopping Log2Ram"
+    /usr/local/bin/log2ram stop
+  eend $?
+}
+
+write() {
+  ebegin "Syncing logs to disk"
+    /usr/local/bin/log2ram write
+  eend $?
+}

log2ram.openrc_cron

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+sleep 5  # Delay to avoid conflict with logrotate
+rc-service log2ram write

uninstall.sh

@@ -1,21 +1,33 @@
 #!/usr/bin/env sh
 
-if [ "$(id -u)" -eq 0 ]
-then
+[ "$(id -u)" -eq 0 ] || { echo "You need to be ROOT (sudo can be used)"; exit 1; }
+
+# See if we can find out the init-system
+echo "Try to detect init..."
+if [ "$(systemctl --version)" != '' ] ; then
+  INIT='systemd'
+elif [ "$(rc-service --version)" != '' ] ; then
+  INIT='openrc'
+fi
+
+if [ "$INIT" = 'systemd' ] ; then
   service log2ram stop
   systemctl disable log2ram
   rm /etc/systemd/system/log2ram.service
-  rm /usr/local/bin/log2ram
-  rm /etc/log2ram.conf
-  rm /etc/cron.daily/log2ram
-  rm /etc/logrotate.d/log2ram
+elif [ "$INIT" = 'openrc' ] ; then
+  rc-service log2ram stop
+  rc-update del log2ram boot
+  rm /etc/init.d/log2ram
+fi
+
+rm /usr/local/bin/log2ram
+rm /etc/log2ram.conf
+rm /etc/cron.daily/log2ram
+rm /etc/logrotate.d/log2ram
 
-  if [ -d /var/hdd.log ]; then
-    rm -r /var/hdd.log
-  fi
-  echo "Log2Ram is uninstalled, removing the uninstaller in progress"
-  rm /usr/local/bin/uninstall-log2ram.sh
-  echo "##### Reboot isn't needed #####"
-else
-  echo "You need to be ROOT (sudo can be used)"
+if [ -d /var/hdd.log ]; then
+  rm -r /var/hdd.log
 fi
+echo "Log2Ram is uninstalled, removing the uninstaller in progress"
+rm /usr/local/bin/uninstall-log2ram.sh
+echo "##### Reboot isn't needed #####"