add local mode for backup

Dockerfile

@@ -15,10 +15,6 @@ COPY ./scripts /dockup/
 RUN chmod 755 /dockup/*.sh
 CMD ["/dockup/run.sh"]
 
-ENV S3_BUCKET_NAME docker-backups.example.com
-ENV AWS_ACCESS_KEY_ID **DefineMe**
-ENV AWS_SECRET_ACCESS_KEY **DefineMe**
-ENV AWS_DEFAULT_REGION us-east-1
 ENV PATHS_TO_BACKUP auto
 ENV BACKUP_NAME backup
 ENV RESTORE false
@@ -29,4 +25,14 @@ ENV BACKUP_TAR_TRIES 5
 ENV BACKUP_TAR_RETRY_SLEEP 30
 ENV DOCKUP_MODE aws
 
+# aws
+ENV S3_BUCKET_NAME docker-backups.example.com
+ENV AWS_ACCESS_KEY_ID **DefineMe**
+ENV AWS_SECRET_ACCESS_KEY **DefineMe**
+ENV AWS_DEFAULT_REGION us-east-1
+
+# local
+ENV LOCAL_TARGET /dockup/target
+RUN mkdir $LOCAL_TARGET
+
 WORKDIR /dockup

README.md

@@ -59,6 +59,18 @@ It should either be empty or hold a path and end with a slash.
 
 For more complex backup tasks as dumping a database, you can optionally define the environment variables `BEFORE_BACKUP_CMD` and `AFTER_BACKUP_CMD`.
 
+### Backup target
+
+Although dockup was initially designed to specifically support backups so AWS S3, you can also use different kinds of backup targets.
+
+This is possible via the environment variable `DOCKUP_MODE`.
+It allows running custom logic to do the actual backup/restoration (see subfolders in `scripts/`).
+
+By default, the following modes are available:
+
+- `aws` - store in AWS S3
+- `local` - store in a local folder (e.g. in a volume mounted into the dockup container, defaults to `/dockup/target`)
+
 ### Detect volumes
 
 Instead of providing paths manually you can set the `PATHS_TO_BACKUP` to `auto`.

scripts/backup.sh

@@ -115,10 +115,10 @@ cleanup
 end_time=`date +%Y-%m-%d\\ %H:%M:%S\\ %Z`
 backup_duration=`date -u -d @"$SECONDS" +'%-Mm %-Ss'`
 if [ $rc -ne 0 ]; then
-  notifyFailure "Error uploading backup to S3."
+  notifyFailure "Error backuping up archive."
   echo -e "[$end_time] Backup failed\n\n"
   exit $rc
 else
   notifySuccess
-  echo -e "[$end_time] Archive successfully uploaded to S3\n\n"
+  echo -e "[$end_time] Archive successfully backed up\n\n"
 fi

scripts/local/backup.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# Move the tarball to the destination folder
+echo "Move the archive to the destination folder..."
+mv $tarball ${LOCAL_TARGET}/

scripts/local/restore.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ ! -n "${LAST_BACKUP}" ]; then
+  # Find last backup file
+  : ${LAST_BACKUP:=$(ls $LOCAL_TARGET/ -1 | grep ^$BACKUP_NAME | sort -r | head -n1)}
+fi
+
+# Retrieve from local storage
+echo "Retrieving backup archive $LAST_BACKUP..."
+mv "${LOCAL_TARGET}/${LAST_BACKUP}" $LAST_BACKUP

scripts/notifications.sh

@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#
+# Note: Notification texts assume storage in S3
+#
+
 function notifySuccess {
   if [ "$NOTIFY_BACKUP_SUCCESS" == "true" ]; then
     notify_summary="[${S3_FOLDER}$BACKUP_NAME] Backup succeeded."

test-backup.sh

@@ -46,6 +46,7 @@ docker run --rm \
   -e GPG_KEYRING=/$GPG_KEYNAME.pub \
   --volumes-from dockup-data-test \
   -v $(pwd)/$GPG_KEYNAME.pub:/$GPG_KEYNAME.pub \
+  -v $(pwd)/target:/dockup/target \
   --name dockup-run-test wetransform/dockup:local
 rc=$?; if [ $rc -ne 0 ]; then
   echo "ERROR: Error running backup"
@@ -69,6 +70,7 @@ docker run --rm \
   --volumes-from dockup-data-test \
   -v $(pwd)/$GPG_KEYNAME.pub:/$GPG_KEYNAME.pub \
   -v $(pwd)/$GPG_KEYNAME.sec:/$GPG_KEYNAME.sec \
+  -v $(pwd)/target:/dockup/target \
   --name dockup-run-test wetransform/dockup:local
 rc=$?; if [ $rc -ne 0 ]; then
   echo "ERROR: Error running restore"

test-env.txt.sample

@@ -4,4 +4,5 @@ AWS_DEFAULT_REGION=eu-central-1
 S3_BUCKET_NAME=???
 S3_FOLDER=dockup-test/
 NOTIFY_BACKUP_SUCCESS=false
-NOTIFY_BACKUP_FAILURE=false
+NOTIFY_BACKUP_FAILURE=false
+DOCKUP_MODE=aws