Refactor borg to be backup and restore script.

templates/usr/local/bin/cloud_backup.j2

@@ -0,0 +1,147 @@
+#!/bin/bash
+
+BORGUSER="{{ backup_owner }}";
+RUNFOLDER="{{ backup_run_folder }}";
+TARGETFOLDER="{{ backup_storage }}";
+REPOLOCATION="{{ backup_location }}";
+ARCHIVENAME="{{ backup_app }}-$(date '+%s')";
+
+help (){
+    echo "cloud_backup - backup and restore script on cloud with borg target v1.0 by L.Hahn.
+
+Usage: $0 COMMAND [ARCHIVENAME]
+
+COMMAND:
+    - list                      List available archives in remote borg repository for your host.
+    - backup                    Perform backup of your host and create a new archive in borg repository.
+    - restore [ARCHIVENAME]     Download backup from borg repository to your host and restore files.
+                                    May turn off your application if still running.
+                                    If no ARCHIVENAME is provided, the latest one based on timestamp is taken.
+                                    IF ARCHIVENAME is provided, will try to download it; throws error if not found.
+";
+}
+
+
+### INDIVIDUAL TEMPLATE PART ###
+prework_backup () {
+    {{ backup_script.prework_backup | indent( width=4) }}
+}
+
+postwork_restore () {
+    {{ backup_script.postwork_restore | indent( width=4) }}
+}
+
+
+### SHARED TEMPLATE PART ###
+get_archives () {
+    ARCHIVEIDS=$(
+        sudo -H -u $BORGUSER bash -c '
+        REPOLOCATION='$REPOLOCATION';
+        export BORG_PASSPHRASE=$(cat {{ backup_home }}/.borg.key);
+        borg list $REPOLOCATION' | grep {{ backup_app }} | sort -r);
+    echo "$ARCHIVEIDS";
+}
+
+cloud_backup () {
+    mkdir -p $TARGETFOLDER/$ARCHIVENAME;
+    prework_backup;
+    cd /;
+    sudo -H -u $BORGUSER bash -c '
+    TARGETFOLDER='$TARGETFOLDER';
+    REPOLOCATION='$REPOLOCATION';
+    ARCHIVENAME='$ARCHIVENAME';
+    export BORG_PASSPHRASE=$(cat {{ backup_home }}/.borg.key);
+    borg create -C lzma $REPOLOCATION::$ARCHIVENAME $TARGETFOLDER/$ARCHIVENAME';
+
+    rm -rf $TARGETFOLDER/$ARCHIVENAME;
+}
+
+cloud_restore () {
+    ARCHIVENAME=$1;
+    ARCHIVEIDS=$(get_archives | cut -f 1 -d ' ');
+    if [[ "${ARCHIVENAME,,}" == "latest" ]];
+    then
+        ARCHIVENAME=$(echo "$ARCHIVEIDS" | head -n 1);
+    else
+        if [[ "$ARCHIVEIDS" != *$ARCHIVENAME* ]];
+        then
+            echo "ERROR! Provided archivename '$ARCHIVENAME' is not part of the available archives! Aborting.";
+            exit 1;
+        fi
+    fi
+
+    mkdir -p $TARGETFOLDER/$ARCHIVENAME;
+    chown -R $BORGUSER: $TARGETFOLDER
+
+    cd /;
+    sudo -H -u $BORGUSER bash -c '
+    REPOLOCATION='$REPOLOCATION';
+    ARCHIVENAME='$ARCHIVENAME';
+    export BORG_PASSPHRASE=$(cat {{ backup_home }}/.borg.key);
+    borg extract $REPOLOCATION::$ARCHIVENAME --list';
+
+    postwork_restore;
+    rm -rf $TARGETFOLDER/$ARCHIVENAME;
+}
+
+cloud_backup_delete () {
+    ARCHIVENAME=$1;
+    ARCHIVEIDS=$(get_archives | cut -f 1 -d ' ');
+    if [[ "$ARCHIVEIDS" != *$ARCHIVENAME* ]];
+    then
+        echo "ERROR! Provided archivename '$ARCHIVENAME' is not part of the available archives! Aborting.";
+        exit 1;
+    fi
+
+    sudo -H -u $BORGUSER bash -c '
+    REPOLOCATION='$REPOLOCATION';
+    ARCHIVENAME='$ARCHIVENAME';
+    export BORG_PASSPHRASE=$(cat {{ backup_home }}/.borg.key);
+    borg delete $REPOLOCATION::$ARCHIVENAME';
+
+}
+
+has_argument () {
+    if [[ -z "$1" ]];
+    then
+        echo "Missing required paramter!";
+        exit 1;
+    fi
+}
+
+(
+    flock -n 9 || {
+        echo "BACKUP ALREADY RUNNING! ABORTING.";
+        exit 1;
+    }
+
+    if [ $# = 0 ]; then
+        help;
+        exit 0;
+    fi
+
+    action=$1
+    case $action in
+        "list")
+            get_archives;
+            ;;
+
+        "backup")
+            cloud_backup;
+            ;;
+
+        "restore")
+            has_argument $2;
+            cloud_restore $2;
+            ;;
+        "delete")
+            has_argument $2;
+            cloud_backup_delete $2;
+            ;;
+        *)
+            help;
+            exit 0;
+            ;;
+    esac
+    echo ""
+) 9>/var/run/lock/cloud-backup.lock;