more generic backend selection, added borgbackup backend

3 files changed, 85 insertions, 4 deletions

diff --git a/backends/borg.sh b/backends/borg.sh
new file mode 100644
index 0000000..d3d9c63
--- /dev/null
+++ b/backends/borg.sh
@@ -0,0 +1,66 @@
+function borg_init() {
+    export BORG_PASSCOMMAND="$BACKUP_PASSCOMMAND"
+    for BACKUP_DIR in ${BACKUP_DIRS[*]}
+    do
+        # borg will check if repo exists
+        borg init --encryption=repokey-blake2 "$BACKUP_DIR"
+    done
+}
+
+function borg_create_backup() {
+    export BORG_PASSCOMMAND="$BACKUP_PASSCOMMAND"
+    RETCODE=255
+    for BACKUP_DIR in ${BACKUP_DIRS[*]}
+    do
+        export BORG_REPO="$BACKUP_DIR"
+
+        trap 'echo $( date ) Backup interrupted >&2; exit 2' INT TERM
+
+        echo "borg: starting backup to \"$BACKUP_DIR\""
+
+        borg create                         \
+            "${BACKUP_DIR}::${BACKUP_NAME}_{hostname}_{now}" \
+            "$WORLD_NAME"               \
+            --filter AME                    \
+            --compression lz4               \
+            --exclude-caches                \
+
+            backup_exit=$?
+
+        echo "borg: pruning repository at \"$BACKUP_DIR\""
+
+        borg prune                          \
+            --prefix '{hostname}-'          \
+            --keep-minutely 2               \
+            --keep-hourly   24              \
+            --keep-daily    7               \
+            --keep-weekly   4               \
+            --keep-monthly  6               \
+            "$BACKUP_DIR"
+
+        prune_exit=$?
+
+        # use highest exit code as global exit code
+        global_exit=$(( backup_exit > prune_exit ? backup_exit : prune_exit ))
+        RETCODE=$(( global_exit > RETCODE ? global_exit : RETCODE ))
+
+        if [ ${global_exit} -eq 0 ]; then
+            echo "borg: backup and prune finished successfully"
+        elif [ ${global_exit} -eq 1 ]; then
+            echo "borg: backup and/or prune finished with warnings"
+        else
+            echo "borg: backup and/or prune finished with errors"
+        fi
+        #exit ${global_exit}
+    done
+    return $RETCODE
+}
+
+function borg_ls() {
+    export BORG_PASSCOMMAND="$BACKUP_PASSCOMMAND"
+    for BACKUP_DIR in ${BACKUP_DIRS[*]}
+    do
+        echo "borg: backups in \"$BACKUP_DIR\":"
+        borg list "$BACKUP_DIR"
+    done
+}
diff --git a/server.sh b/server.sh
index 9ed7edf..ee16af7 100755
--- a/server.sh
+++ b/server.sh
@@ -10,6 +10,7 @@ fi
 
 source "backends/tar.sh"
 source "backends/bup.sh"
+source "backends/borg.sh"
 
 function backup_hook_example {
 	bup -d $CUR_BACK_DIR ls -l $BACKUP_NAME/latest/var/minecraft
@@ -121,8 +122,10 @@ function init_backup() {
 		fi
 	done
 
-	if [ $USE_BUP = "YES" ]; then
+	if [ $BACKUP_BACKEND = "bup" ]; then
 		bup_init
+	elif [ $BACKUP_BACKEND = "borg" ]; then
+		borg_init
 	else
 		tar_init
 	fi
@@ -131,8 +134,10 @@ function init_backup() {
 function create_backup() {
 	init_backup
 
-	if [ $USE_BUP = "YES" ]; then
+	if [ $BACKUP_BACKEND = "bup" ]; then
 		bup_create_backup
+	elif [ $BACKUP_BACKEND = "borg" ]; then
+		borg_create_backup
 	else
 		tar_create_backup
 	fi
@@ -218,8 +223,10 @@ function server_backup() {
 }
 
 function ls_backups() {
-	if [ $USE_BUP = "YES" ]; then
+	if [ $BACKUP_BACKEND = "bup" ]; then
 		bup_ls
+	elif [ $BACKUP_BACKEND = "borg" ]; then
+		borg_ls
 	else
 		tar_ls
 	fi
diff --git a/serverconf.sh b/serverconf.sh
index 8625bf3..a73a65d 100644
--- a/serverconf.sh
+++ b/serverconf.sh
@@ -16,9 +16,17 @@ WORLD_NAME="lfja"
 BACKUP_NAME="${WORLD_NAME}_backup"
 LOGFILE="logs/latest.log"
 PIDFILE="server-screen.pid"
-USE_BUP="NO"
+# if not bup or borg, uses tar by default
+#BACKUP_BACKEND="tar"
+#BACKUP_BACKEND="bup"
+BACKUP_BACKEND="borg"
 
 #Constants
 CUR_YEAR=`date +"%Y"`
 
 BACKUP_DIRS=(".bak/$CUR_YEAR" "user@backupserver:/path/to/backup/$CUR_YEAR")
+
+# borg repository could be password protected
+# to avoid having to manually type password, borg can run a command that should echo a password
+#BACKUP_PASSCOMMAND="echo superstrongpassword"
+#BACKUP_PASSCOMMAND="pass passwordname"