Added awareness of systemd-journald (#200)

* Reformatted and refactored some files

* Added awareness of systemd-journald
- Added dependency for bash in debian control file, because this implementation uses bash arrays
- Changed in all shell scripts the interpreter to bash
- Replaced "service log2ram stop" with "systemctl stop log2ram"
- Replaced "-a" with "] && ["
- Increased SIZE and LOG_DISK_SIZE to 128M and 256M because journald can use a lot of space
- Introduced a new switch JOURNALD_AWARE

README.md

@@ -73,7 +73,7 @@ If you do not get any line as response of these commands, something is not worki
 
 ## Upgrading
 
-You need to stop Log2Ram (`service log2ram stop`) and execute the [installation](#installation) process. If you used APT, this will be done automatically.
+You need to stop Log2Ram (`systemctl stop log2ram`) and execute the [installation](#installation) process. If you used APT, this will be done automatically.
 
 ## Customization
 

debian/control

@@ -1,5 +1,6 @@
 Package: log2ram
 Version: VERSION-TO-REPLACE
+Depends: bash (>= 4.3)
 Section: net
 Priority: optional
 Architecture: all

debian/preinst

@@ -1,5 +1,4 @@
-#!/bin/bash
-
+#!/usr/bin/env bash
 systemctl -q is-active log2ram.service  && systemctl stop log2ram.service
 systemctl -q is-active log2ram-daily.timer  && systemctl stop log2ram-daily.timer
 rm -rf /var/hdd.log

install.sh

@@ -1,7 +1,7 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 systemctl -q is-active log2ram && {
-    echo "ERROR: log2ram service is still running. Please run \"sudo service log2ram stop\" to stop it."
+    echo "ERROR: log2ram service is still running. Please run \"sudo systemctl stop log2ram\" to stop it."
     exit 1
 }
 [ "$(id -u)" -eq 0 ] || {

log2ram

@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 . /etc/log2ram.conf
 
@@ -16,13 +16,36 @@ is_safe() {
     [ -d "$HDD_LOG" ] || exit 1
 }
 
+## @fn journald_logrotate()
+## @brief Logrotate the journal if the current RAM_LOG path is part of the journald directory
+journald_logrotate() {
+    if ! [ -x "$(command -v journalctl)" ] || ! [ "$JOURNALD_AWARE" = true ]; then
+        return 1
+    fi
+
+    if journalctl --header | grep "File path" | grep "$RAM_LOG" >/dev/null 2>&1; then
+        journalctl --rotate
+        return 0
+    else
+        return 1
+    fi
+}
+
 ## @fn sync_to_disk()
 ## @brief Sync memory back to hard disk
 sync_to_disk() {
     is_safe
 
-    if [ -z "${NO_RSYNC}" -a -x "$(command -v rsync)" ]; then
-        rsync -aXv --inplace --no-whole-file --delete-after "$RAM_LOG"/ "$HDD_LOG"/ 2>&1 | tee -a "$LOG2RAM_LOG"
+    optional_params=()
+
+    if journald_logrotate; then
+        optional_params+=("--include=journal/*/*@*.journal")
+        optional_params+=("--exclude=journal/*/*")
+    fi
+
+    if [ -z "${NO_RSYNC}" ] && [ -x "$(command -v rsync)" ]; then
+        rsync -aXv --inplace --no-whole-file --delete-after "${optional_params[@]}" "$RAM_LOG"/ "$HDD_LOG"/ 2>&1 |
+            tee -a "$LOG2RAM_LOG"
     else
         cp -rfup "$RAM_LOG"/ -T "$HDD_LOG"/ 2>&1 | tee -a "$LOG2RAM_LOG"
     fi
@@ -48,7 +71,7 @@ sync_from_disk() {
         exit 1
     fi
 
-    if [ -z "${NO_RSYNC}" -a -x "$(command -v rsync)" ]; then
+    if [ -z "${NO_RSYNC}" ] && [ -x "$(command -v rsync)" ]; then
         rsync -aXv --inplace --no-whole-file --delete-after "$HDD_LOG"/ "$RAM_LOG"/ 2>&1 | tee -a "$LOG2RAM_LOG"
     else
         cp -rfup "$HDD_LOG"/ -T "$RAM_LOG"/ 2>&1 | tee -a "$LOG2RAM_LOG"

log2ram.conf

@@ -5,7 +5,7 @@
 # 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
+SIZE=128M
 
 # Select the log syncing method between the log directory on disk and in the RAM.
 # The variable may be uncommented out, setting it to false, if "cp" is preferred over "rsync".
@@ -18,10 +18,16 @@ SIZE=40M
 # Change it to false and you will have only a log if there is no place on RAM anymore.
 MAIL=true
 
-# Variable for folders to put in RAM. You need to specify the real folder `/path/folder` , the `/path/hdd.folder` will be automatically created. Multiple path can be separeted by `;`. Do not add the final `/` !
+# Variable for folders to put in RAM. You need to specify the real folder `/path/folder` , the `/path/hdd.folder` will
+# be automatically created. Multiple path can be separeted by `;`. Do not add the final `/` !
 # example : PATH_DISK="/var/log;/home/test/FolderInRam"
 PATH_DISK="/var/log"
 
+# Should log2ram consider journald and do a log rotate before copying the log files back? Please note that for this
+# rsync is mandatory. Also make sure that you have configured SystemMaxUse in journald.conf, because the size of this
+# ram folder is will probably not be as large as journald will use by default
+JOURNALD_AWARE=true
+
 # **************** Zram backing conf  *************************************************
 
 # ZL2R Zram Log 2 Ram enables a zram drive when ZL2R=true ZL2R=false is mem only tmpfs
@@ -35,4 +41,4 @@ COMP_ALG=lz4
 # LOG_DISK_SIZE is expected compression ratio of alg chosen multiplied by log SIZE
 # lzo/lz4=2.1:1 compression ratio zlib=2.7:1 zstandard=2.9:1
 # Really a guestimate of a bit bigger than compression ratio whilst minimising 0.1% mem usage of disk size
-LOG_DISK_SIZE=100M
+LOG_DISK_SIZE=256M

uninstall.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 if dpkg -l log2ram 2>/dev/null; then
     echo "Please run : apt remove log2ram"