1 files changed, 84 insertions, 0 deletions
diff --git a/backends/borg.sh b/backends/borg.sh
new file mode 100644
index 0000000..ec39bc8
--- /dev/null
+++ b/backends/borg.sh
@@ -0,0 +1,84 @@
+function borg_init() {
+	local encryption
+	if [ -z "$BACKUP_PASSCOMMAND" ] ; then
+		log_info "borg: no password given, repository is not protected"
+		encryption="none"
+	else
+		encryption="repokey-blake2"
+	fi
+
+    export BORG_PASSCOMMAND="$BACKUP_PASSCOMMAND"
+    for backup_dir in ${BACKUP_DIRS[*]}
+    do
+		log_debug "Initializing repo at $backup_dir "
+        # borg will check if repo exists
+        borg init --encryption="$encryption" "$backup_dir"
+	done
+}
+
+function borg_create_backup() {
+    export BORG_PASSCOMMAND="$BACKUP_PASSCOMMAND"
+    local retcode=255
+    for backup_dir in ${BACKUP_DIRS[*]}
+    do
+        export BORG_REPO="$backup_dir"
+
+        trap 'echo [WARNING] $( date ) Backup interrupted >&2; exit 2' INT TERM
+
+        log_info "borg: backing up to \"$backup_dir\""
+
+        borg create                         \
+            "${backup_dir}::${BACKUP_NAME}_$(date +'%F_%H-%M-%S')" \
+            "$WORLD_NAME"               \
+            --filter AME                    \
+            --compression lz4               \
+            --exclude-caches                \
+
+        local backup_exit=$?
+
+        log_debug "borg: pruning repository at \"$backup_dir\""
+
+        borg prune                          \
+            --prefix '{hostname}-'          \
+            --keep-minutely 2               \
+            --keep-hourly   24              \
+            --keep-daily    7               \
+            --keep-weekly   4               \
+            --keep-monthly  6               \
+            "$backup_dir"
+
+        local prune_exit=$?
+
+        # use highest exit code as global exit code
+        local global_exit=$(( backup_exit > prune_exit ? backup_exit : prune_exit ))
+        retcode=$(( global_exit > retcode ? global_exit : retcode ))
+
+        if [ ${global_exit} -eq 0 ]; then
+            log_debug "borg: backup and prune finished successfully"
+        elif [ ${global_exit} -eq 1 ]; then
+            log_info "borg: backup and/or prune finished with warnings"
+        else
+            log_error "borg: backup and/or prune finished with errors"
+        fi
+        #exit ${global_exit}
+    done
+    return $retcode
+}
+
+# server_restore relies on output format of this function
+function borg_ls() {
+    export BORG_PASSCOMMAND="$BACKUP_PASSCOMMAND"
+    borg list "$1" | cut -d' ' -f1 | sort -r
+}
+
+function borg_restore() {
+    export BORG_PASSCOMMAND="$BACKUP_PASSCOMMAND"
+    local remote="$1"
+    local snapshot="$2"
+	local dest="$3"
+
+    export BORG_REPO="$remote"
+	cd "$dest"
+    borg extract "${remote}::${snapshot}"
+	cd - > /dev/null
+}