From fc198700f0454d5f145de19bb4da31ad46feffe8 Mon Sep 17 00:00:00 2001
From: KamiCreed <9517086+KamiCreed@users.noreply.github.com>
Date: Sun, 29 Mar 2020 04:45:46 -0700
Subject: Change backups to only when a player is online

Also, adds a fallback daily forced backup and error handling to prevent
concurrent backup.
---
 daily-mc-backup.timer |  9 +++++++
 mc-fbackup.service    | 15 +++++++++++
 server.sh             | 74 ++++++++++++++++++++++++++++++++++++++++++++-------
 3 files changed, 89 insertions(+), 9 deletions(-)
 create mode 100644 daily-mc-backup.timer
 create mode 100644 mc-fbackup.service

diff --git a/daily-mc-backup.timer b/daily-mc-backup.timer
new file mode 100644
index 0000000..eef3832
--- /dev/null
+++ b/daily-mc-backup.timer
@@ -0,0 +1,9 @@
+[Unit]
+Description=Force Backup Minecraft Server Daily
+
+[Timer]
+OnCalendar=daily
+Unit=mc-fbackup.service
+
+[Install]
+WantedBy=multi-user.target
diff --git a/mc-fbackup.service b/mc-fbackup.service
new file mode 100644
index 0000000..a922b69
--- /dev/null
+++ b/mc-fbackup.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=Force backup of Minecraft Server
+
+[Service]
+Type=simple
+User=minecraftuser
+Group=minecraftuser
+ExecStart=/var/minecraft/server.sh fbackup
+Restart=on-failure
+RestartSec=10s
+StartLimitInterval=10min
+StartLimitBurst=8
+
+[Install]
+WantedBy=multi-user.target
diff --git a/server.sh b/server.sh
index 5dd0e0f..6dd2db8 100755
--- a/server.sh
+++ b/server.sh
@@ -10,11 +10,15 @@ WORLD_NAME="world"
 BACKUP_NAME="mc-sad-squad"
 LOGFILE="logs/latest.log"
 PIDFILE="server-screen.pid"
+
 #HOOKS
 BACKUP_HOOK='backup_hook_example'
 
+#Constants
+CUR_YEAR=`date +"%Y"`
+
 function backup_hook_example {
-	bup -d $CUR_BACK_DIR ls $BACKUP_NAME
+	bup -d $CUR_BACK_DIR ls -l $BACKUP_NAME/latest/var/minecraft
 }
 
 function send_cmd () {
@@ -82,10 +86,12 @@ function server_attach() {
 }
 
 function server_running() {
-	[ -f $PIDFILE ] && [ "$(cat $PIDFILE)" != "" ]
-	return # Returns the status of above conditional. Failure (1) if false, Success (0) if true.
-
-	ps -p $(cat $PIDFILE) > /dev/null
+	if [ -f $PIDFILE ] && [ "$(cat $PIDFILE)" != "" ]; then
+		ps -p $(cat $PIDFILE) > /dev/null
+		return
+	fi
+	
+	false
 }
 
 function server_status() {
@@ -98,10 +104,29 @@ function server_status() {
 	exit
 }
 
+function players_online() {
+	send_cmd "list"
+	sleep 1
+	while [ $(tail -n 3 "$LOGFILE" | grep -c "There are") -lt 1 ]
+	do
+		sleep 1
+	done
+
+	[ `tail -n 3 "$LOGFILE" | grep -c "There are 0"` -lt 1 ]
+}
+
+
 function server_backup_safe() {
-	echo "Detected running server. Disabling autosave"
+	force=$1
+	echo "Detected running server. Checking if players online..."
+	if [ "$force" != "true" ] && ! players_online; then
+		echo "Players are not online. Not backing up."
+		return
+	fi
+
+	echo "Disabling autosave"
 	send_cmd "save-off"
-	send_cmd "save-all flush"
+	send_cmd "save-all"
 	echo "Waiting for save... If froze, run /save-on to re-enable autosave!!"
 	
 	sleep 1
@@ -139,7 +164,6 @@ function server_backup_unsafe() {
 
 function create_bup_backup() {
 	BACKUP_DIR="mc-backups"
-	CUR_YEAR=`date +"%Y"`
 	CUR_BACK_DIR="mc-backups/$CUR_YEAR"
 
 	if [ ! -d "$CUR_BACK_DIR" ]; then
@@ -174,9 +198,31 @@ function create_backup_archive() {
 	fi
 }
 
+function backup_running() {
+	systemctl is-active --quiet mc-backup.service
+}
+
+function fbackup_running() {
+	systemctl is-active --quiet mc-fbackup.service
+}
+
 function server_backup() {
+	force=$1
+
+	if [ "$force" = "true" ]; then
+        if backup_running; then
+            echo "A backup is running. Aborting..."
+            return
+        fi
+    else
+        if fbackup_running; then
+            echo "A force backup is running. Aborting..."
+            return
+        fi
+	fi
+
 	if server_running; then 
-		server_backup_safe
+		server_backup_safe "$force"
 	else 
 		server_backup_unsafe
 	fi
@@ -184,6 +230,10 @@ function server_backup() {
 	exit
 }
 
+function ls_bup() {
+	bup -d "mc-backups/${CUR_YEAR}" ls "mc-sad-squad/$1"
+}
+
 cd $(dirname $0)
 
 case $1 in
@@ -203,6 +253,12 @@ case $1 in
 	"status")
 		server_status
 		;;
+	"fbackup")
+		server_backup "true"
+		;;
+	"ls")
+		ls_bup $2
+		;;
 	*)
 		echo "Usage: $0 start|stop|attach|status|backup"
 		;;
-- 
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