chore(deps): update docker.io/alpine docker tag to v3.23 (#28)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| docker.io/alpine | final | minor | `3.22` -> `3.23` |

---

### Configuration

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---

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---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi4yNi4xMSIsInVwZGF0ZWRJblZlciI6IjQyLjI2LjExIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Reviewed-on: #28
Reviewed-by: t.behrendt <t.behrendt@noreply.localhost>
Co-authored-by: Renovate Bot <renovate@t00n.de>
Co-committed-by: Renovate Bot <renovate@t00n.de>

.drone.yaml

@@ -1,28 +0,0 @@
-kind: pipeline
-type: docker
-
-name: build-and-push-container
-
-triggers:
-  branch:
-    - main
-  event:
-    - push
-
-steps:
-  - name: build
-    image: plugins/docker
-    commands:
-      - docker build -t gitea.t000-n.de/t.behrendt/backupsidecar:${DRONE_COMMIT:0:8} .
-
-  - name: push
-    image: plugins/docker
-    settings:
-      username:
-        from_secret: REGISTRY_USERNAME
-      password:
-        from_secret: REGISTRY_PASSWORD
-      repo: gitea.t000-n.de/t.behrendt/backupsidecar
-      tags: 
-        - latest
-        - ${DRONE_COMMIT:0:8}

.gitea/workflows/cd.yaml

@@ -0,0 +1,111 @@
+name: CD
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  DOCKER_REGISTRY: gitea.t000-n.de
+
+jobs:
+  check-changes:
+    name: Check changes
+    runs-on: ubuntu-latest
+    outputs:
+      changes: ${{ steps.filter.outputs.code }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+
+      - name: Get changed files
+        id: filter
+        uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3
+        with:
+          filters: |
+            code:
+              - 'src/**'
+              - 'Dockerfile'
+              - 'gitea/workflows/**'
+
+  build_and_push:
+    name: Build and push
+    needs:
+      - check-changes
+    if: ${{ needs.check-changes.outputs.changes != '0' }}
+    strategy:
+      matrix:
+        arch:
+          - amd64
+          - arm64
+    runs-on:
+      - ubuntu-latest
+      - linux_${{ matrix.arch }}
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3
+      - uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3
+        with:
+          registry: ${{ env.DOCKER_REGISTRY }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - id: meta
+        run: |
+          echo REPO_NAME=$(echo ${GITHUB_REPOSITORY} | awk -F"/" '{print $2}' | tr '[:upper:]' '[:lower:]') >> $GITHUB_OUTPUT
+          echo REPO_VERSION=$(git describe --tags --always | sed 's/^v//') >> $GITHUB_OUTPUT
+      - uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/${{ matrix.arch }}
+          push: true
+          provenance: false
+          tags: |
+            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}-${{ matrix.arch }}
+
+  create_tag:
+    name: Create tag
+    needs:
+      - check-changes
+    if: ${{ needs.check-changes.outputs.changes != '0' }}
+    runs-on: ubuntu-latest
+    outputs:
+      tag: ${{ steps.tag.outputs.new-tag }}
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        with:
+          fetch-depth: 0
+      - uses: https://gitea.t000-n.de/t.behrendt/conventional-semantic-git-tag-increment@0.0.2
+        id: tag
+        with:
+          token: ${{ secrets.GITEA_TOKEN }}
+      - run: |
+          git tag ${{ steps.tag.outputs.new-tag }}
+          git push origin ${{ steps.tag.outputs.new-tag }}
+      - name: Set output
+        run: |
+          echo "tag=${{ steps.tag.outputs.new-tag }}" >> $GITHUB_OUTPUT
+
+  create_manifest:
+    name: Create manifest
+    needs:
+      - build_and_push
+      - create_tag
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - id: meta
+        run: |
+          echo REPO_NAME=$(echo ${GITHUB_REPOSITORY} | awk -F"/" '{print $2}' | tr '[:upper:]' '[:lower:]') >> $GITHUB_OUTPUT
+          echo REPO_VERSION=$(git describe --tags --always | sed 's/^v//') >> $GITHUB_OUTPUT
+      - uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3
+        with:
+          registry: ${{ env.DOCKER_REGISTRY }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - run: |
+          docker manifest create ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ needs.create_tag.outputs.tag }} \
+            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}-amd64 \
+            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}-arm64
+
+          docker manifest push ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ needs.create_tag.outputs.tag }}

.gitea/workflows/ci.yaml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    name: Build Docker image
+    runs-on:
+      - ubuntu-latest
+      - linux_amd64
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3
+      - name: Build image
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64
+          push: false
+          provenance: false
+          tags: |
+            backupsidecar:ci-test
+
+  check-syntax:
+    name: Check syntax
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - name: Check syntax
+        run: |
+          bash -n src/backup.sh

.gitignore

@@ -1 +0,0 @@
-dockerBuildAndPush.sh

Dockerfile

@@ -1,14 +1,20 @@
-FROM alpine:3.17
+FROM docker.io/alpine:3.23@sha256:51183f2cfa6320055da30872f211093f9ff1d3cf06f39a0bdb212314c5dc7375 AS base
 
-# Setup correct TZ
+# Add edge repository for postgresql18-client
-RUN apk add alpine-conf
+RUN echo '@edge http://dl-cdn.alpinelinux.org/alpine/edge/main' >> /etc/apk/repositories
-RUN /sbin/setup-timezone -z UTC
 
-RUN apk add restic curl
+RUN apk update && apk add --no-cache \
+    bash \
+    curl \
+    restic \
+    jq \
+    postgresql18-client@edge \
+    libpq@edge
 
 WORKDIR /app
 
-COPY ./src/entry.sh /app/
+COPY src/backup.sh /app/backup.sh
-COPY ./src/backup.sh /app/
 
-CMD [ "/bin/sh", "entry.sh" ]
+RUN chmod +x /app/backup.sh
+
+ENTRYPOINT ["/app/backup.sh"]

README.md

@@ -1,20 +1,241 @@
-# backupsidecar
+# BackupSidecar
 
-Backup sidecar that automatically creates backups of one PVC and saves it to another PVC via restic
+BackupSidecar is a lightweight backup and restore solution designed to run as a cron job in Kubernetes. It automates backups and restores using Restic and supports both directory and PostgreSQL database operations. Optional notifications can be sent via Gotify to keep you informed of operation results.
 
-## Function
+## Configuration
-A cronjob inside the container runs in the configured interval creating the backup and purging old backups.
-A notification is sent to gotify on completion of the backup or on error of either the backup or purge.
 
-## Environment Variables
+BackupSidecar is configured through environment variables. Below is a breakdown of the available settings.
-| ENV Variable | Required |Description| Example Value
+
-|--------------|----------|--------------|-
+### General Settings
-|INTERVAL|yes|cronjob interval string|15 14 * * *|
+
-|RESTIC_REPOSITORY|yes|path of the restic repository|/mnt/backups/gitea|
+These variables apply to both backup and restore operations.
-|SOURCEDIR |yes|path of the path to backup|/mnt/toBackup/|
+
-|KEEPLAST|yes|number of increments to keep (keep in mind that the number of backups to keep correlates with the interval in which they are created) |10|
+- **`OPERATION_MODE`** _(optional)_ - Defines the operation type (`backup` or `restore`). Defaults to `backup`.
-|RESTIC_PASSWORD|yes|password for the restic repository|******|
+- **`BACKUP_MODE`** _(optional)_ - Defines the backup type (`directory` or `postgres`). Defaults to `directory`.
-|RUNONSTART|no|set to true to force a backup at the start of the container|true|
+- **`RESTIC_PASSWORD`** _(required)_ - The encryption password for Restic.
-|GOTIFYHOST|yes|URL of the gotify server (without trailing slash)|https://gotify.example.com|
+- **`RESTIC_REPOSITORY`** _(required)_ - The URI of the Restic repository (e.g., `rest:http://your-rest-server:8000/backup`).
-|GOTIFYTOKEN|yes|gotify app token|******|
+- **`RESTIC_REST_USERNAME`** _(optional)_ - The username for REST server authentication.
-|GOTIFYTOPIC|yes|gotify topic to include in the notification|gotify|
+- **`RESTIC_REST_PASSWORD`** _(optional)_ - The password for REST server authentication.
+- **`ENABLE_GOTIFY`** _(optional)_ - Enable Gotify notifications. Set to `true` to enable, any other value or unset disables notifications. Defaults to `true`.
+- **`GOTIFYHOST`** _(required when ENABLE_GOTIFY=true)_ - The Gotify server URL.
+- **`GOTIFYTOKEN`** _(required when ENABLE_GOTIFY=true)_ - The API token for Gotify.
+- **`GOTIFYTOPIC`** _(required when ENABLE_GOTIFY=true)_ - The topic under which backup notifications will be sent.
+
+### Directory Operations
+
+When running in `directory` mode, the following variables must be set:
+
+**For Backup Operations:**
+
+- **`SOURCEDIR`** _(required)_ - The path of the directory to be backed up.
+
+**For Restore Operations:**
+
+- **`RESTOREDIR`** _(required)_ - The path where files should be restored to.
+- **`RESTORE_SNAPSHOT_ID`** _(optional)_ - The specific snapshot ID to restore (defaults to `latest`).
+
+### PostgreSQL Operations
+
+For `postgres` mode, the following database-related variables are required:
+
+**Common Variables:**
+
+- **`PGHOST`** _(required)_ - The hostname of the PostgreSQL server.
+- **`PGDATABASE`** _(required)_ - The name of the database.
+- **`PGUSER`** _(required)_ - The PostgreSQL username.
+- **`PGPORT`** _(optional)_ - The port for PostgreSQL (defaults to `5432`).
+- **`PGPASSWORD`** _(optional)_ - The password for authentication. Setting this prevents interactive prompts.
+
+**Backup-Specific Variables:**
+
+- **`PG_DUMP_ARGS`** _(optional)_ - Additional flags for `pg_dump`.
+
+**Restore-Specific Variables:**
+
+- **`RESTORE_SNAPSHOT_ID`** _(optional)_ - The specific snapshot ID to restore (defaults to `latest`).
+- **`PSQL_ARGS`** _(optional)_ - Additional flags for `psql` (e.g., `--single-transaction`).
+
+## Dependencies
+
+Ensure the following commands are available in the container:
+
+- `restic`
+- `curl`
+- `jq`
+- `pg_dump` _(only required for PostgreSQL backup operations)_
+- `psql` _(only required for PostgreSQL restore operations)_
+
+## Usage
+
+### Backup Operations
+
+Example Kubernetes CronJob manifest for running BackupSidecar as a cron job for directory backups in minimal configuration:
+
+```yaml
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: backupsidecar-cron
+  namespace: authentik
+spec:
+  schedule: "0 7 * * *"
+  concurrencyPolicy: Forbid
+  successfulJobsHistoryLimit: 5
+  failedJobsHistoryLimit: 3
+  jobTemplate:
+    spec:
+      backoffLimit: 3
+      activeDeadlineSeconds: 300
+      template:
+        spec:
+          restartPolicy: OnFailure
+          containers:
+            - name: backupsidecar
+              image: backupsidecar:latest
+              env:
+                - name: RESTIC_REPOSITORY
+                  value: "rest:http://rest-server:8000/backup"
+                - name: RESTIC_PASSWORD
+                  valueFrom:
+                    secretKeyRef:
+                      name: backupsidecar-secret
+                      key: restic_password
+                - name: BACKUP_MODE
+                  value: "directory" # or "postgres"
+                - name: SOURCEDIR
+                  value: "/data/source"
+                - name: ENABLE_GOTIFY
+                  value: "true"
+                - name: GOTIFYHOST
+                  value: "http://gotify.example.com"
+                - name: GOTIFYTOKEN
+                  valueFrom:
+                    secretKeyRef:
+                      name: backupsidecar-secret
+                      key: gotify_token
+                - name: GOTIFYTOPIC
+                  value: "Backup Notification"
+              # (For PostgreSQL mode, add PGHOST, PGDATABASE, PGUSER, PGPORT, PGPASSWORD)
+              volumeMounts:
+                - name: source-data
+                  mountPath: /data/source
+          restartPolicy: OnFailure
+          volumes:
+            - name: source-data
+              persistentVolumeClaim:
+                claimName: source-data-pvc
+```
+
+### Restore Operations
+
+Example Kubernetes Job manifest for running BackupSidecar to restore a directory:
+
+```yaml
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: backupsidecar-restore
+  namespace: authentik
+spec:
+  backoffLimit: 3
+  activeDeadlineSeconds: 600
+  template:
+    spec:
+      restartPolicy: OnFailure
+      containers:
+        - name: backupsidecar
+          image: backupsidecar:latest
+          env:
+            - name: OPERATION_MODE
+              value: "restore"
+            - name: BACKUP_MODE
+              value: "directory"
+            - name: RESTOREDIR
+              value: "/data/restore"
+            - name: RESTORE_SNAPSHOT_ID
+              value: "abc123def456" # optional, defaults to latest
+            - name: RESTIC_REPOSITORY
+              value: "rest:http://rest-server:8000/backup"
+            - name: RESTIC_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: backupsidecar-secret
+                  key: restic_password
+            - name: GOTIFYHOST
+              value: "http://gotify.example.com"
+            - name: GOTIFYTOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: backupsidecar-secret
+                  key: gotify_token
+            - name: GOTIFYTOPIC
+              value: "Restore Notification"
+          volumeMounts:
+            - name: restore-data
+              mountPath: /data/restore
+      volumes:
+        - name: restore-data
+          persistentVolumeClaim:
+            claimName: restore-data-pvc
+```
+
+Example Kubernetes Job manifest for running BackupSidecar to restore a PostgreSQL database:
+
+```yaml
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: backupsidecar-postgres-restore
+  namespace: authentik
+spec:
+  backoffLimit: 3
+  activeDeadlineSeconds: 600
+  template:
+    spec:
+      restartPolicy: OnFailure
+      containers:
+        - name: backupsidecar
+          image: backupsidecar:latest
+          env:
+            - name: OPERATION_MODE
+              value: "restore"
+            - name: BACKUP_MODE
+              value: "postgres"
+            - name: PGHOST
+              value: "postgres.example.com"
+            - name: PGDATABASE
+              value: "mydatabase"
+            - name: PGUSER
+              value: "myuser"
+            - name: PGPASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-secret
+                  key: password
+            - name: PGPORT
+              value: "5432"
+            - name: RESTORE_SNAPSHOT_ID
+              value: "abc123def456" # optional, defaults to latest
+            - name: PSQL_ARGS
+              value: "--single-transaction" # optional
+            - name: RESTIC_REPOSITORY
+              value: "rest:http://rest-server:8000/backup"
+            - name: RESTIC_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: backupsidecar-secret
+                  key: restic_password
+            - name: GOTIFYHOST
+              value: "http://gotify.example.com"
+            - name: GOTIFYTOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: backupsidecar-secret
+                  key: gotify_token
+            - name: GOTIFYTOPIC
+              value: "Database Restore Notification"
+```
+
+## Notifications
+
+The script can send success or failure notifications via Gotify when enabled. To enable notifications, set `ENABLE_GOTIFY=true` and provide the required Gotify configuration variables (`GOTIFYHOST`, `GOTIFYTOKEN`, `GOTIFYTOPIC`). When notifications are disabled, backup status messages are still logged to the console.

example-deployment.yaml

@@ -1,62 +0,0 @@
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: backup-sidecar
-spec:
-  selector:
-    matchLabels:
-      app: backup-sidecar
-  template:
-    metadata:
-      labels:
-        app: backup-sidecar
-    spec:
-      containers:
-        - name: backup-sidecar
-          image: gitea.t000-n.de/t.behrendt/backupsidecar:latest
-          resources:
-            requests:
-              cpu: 128m
-              memory: 128Mi
-            limits:
-              cpu: 256m
-              memory: 1024Mi
-          volumeMounts:
-            - mountPath: /mnt/toBackup
-              name: data
-              readOnly: true
-            - mountPath: /mnt/backups/gitea
-              name: nfs-backup
-              subPath: gitea
-          env:
-            - name: INTERVAL
-              value: "15 14 * * *"
-            - name: RESTIC_REPOSITORY
-              value: /mnt/backups/gitea
-            - name: SOURCEDIR
-              value: "/mnt/toBackup/"
-            - name: KEEPLAST
-              value: "100"
-            - name: RESTIC_PASSWORD
-              valueFrom:
-                secretKeyRef:
-                  name: restic-credentials
-                  key: password
-            - name: RUNONSTART
-              value: "false"
-            - name: GOTIFYHOST
-              value: "https://<gotify-URL>"
-            - name: GOTIFYTOKEN
-              valueFrom:
-                secretKeyRef:
-                  name: gotify-credentials
-                  key: token
-            - name: GOTIFYTOPIC
-              value: "gitea"
-      volumes:
-        - name: data
-          persistentVolumeClaim:
-            claimName: data
-        - name: nfs-backup
-          persistentVolumeClaim:
-            claimName: backup-nfs

renovate.json

@@ -0,0 +1,7 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>t.behrendt/renovate-configs:common",
+    "local>t.behrendt/renovate-configs:action"
+  ]
+}

src/backup.sh

@@ -1,40 +1,336 @@
-#!/bin/sh
+#!/bin/bash
+set -euo pipefail
 
-GOTIFYURL="$GOTIFYHOST/message?token=$GOTIFYTOKEN"
+#######################################
+# Date format for logging.
+#######################################
+LOG_DATE_FORMAT="%Y-%m-%dT%T"
 
-echo "$(date +"%Y-%m-%dT%T") - Starting backup"
+#######################################
+# Log a message with a timestamp.
+# Arguments:
+#   Message to log.
+#######################################
+log() {
+    echo "$(date +"$LOG_DATE_FORMAT") - $*"
+}
 
-restic backup           \
+#######################################
-    --verbose		\
+# Determine operation mode from the environment only.
-    $SOURCEDIR
+# Valid values: "backup" or "restore".
+# Default to "backup" if not provided.
+#######################################
+OPERATION_MODE="${OPERATION_MODE:-backup}"
 
-RESTIC_BACKUP_RETURN=$?
+#######################################
+# Determine backup mode from the environment only.
+# Valid values: "directory" or "postgres".
+# Default to "directory" if not provided.
+#######################################
+BACKUP_MODE="${BACKUP_MODE:-directory}"
 
-if [ $RESTIC_BACKUP_RETURN -eq 0 ]; then
+#######################################
-    MSG_BACKUP_SUCCESS="Backup successful"
+# Check for required external commands.
-    echo "$(date +"%Y-%m-%dT%T") - $MSG_BACKUP_SUCCESS"
+#######################################
-    curl -s -X POST "$GOTIFYURL" -F "title=$GOTIFYTOPIC" -F "message=$MSG_BACKUP_SUCCESS"
+REQUIRED_CMDS=(restic curl jq)
-else
+if [ "$BACKUP_MODE" = "postgres" ]; then
-    MSG_BACKUP_ERR="Backup failed with error code $RESTIC_BACKUP_RETURN"
+    if [ "$OPERATION_MODE" = "backup" ]; then
-    echo "$(date +"%Y-%m-%dT%T") - MSG_BACKUP_ERR"
+        REQUIRED_CMDS+=(pg_dump)
-    curl -s -X POST "$GOTIFYURL" -F "title=$GOTIFYTOPIC" -F "message=$MSG_BACKUP_ERR"
+    elif [ "$OPERATION_MODE" = "restore" ]; then
-    exit $RESTIC_BACKUP_RETURN
+        REQUIRED_CMDS+=(psql)
+    fi
 fi
 
+for cmd in "${REQUIRED_CMDS[@]}"; do
+    if ! command -v "$cmd" &>/dev/null; then
+        log "Error: Required command '$cmd' is not installed."
+        exit 1
+    fi
+done
 
-MSG_PURGE_START="$(date +"%Y-%m-%dT%T") - Removing old backups"
+#######################################
-echo $MSG_PURGE_START
+# Validate common required environment variables.
+#######################################
+# Gotify notification settings (optional).
+# Set ENABLE_GOTIFY to "true" to enable notifications, any other value or unset disables them.
+ENABLE_GOTIFY="${ENABLE_GOTIFY:-true}"
 
-restic forget --keep-last $KEEPLAST --prune
+if [ "$ENABLE_GOTIFY" = "true" ]; then
-RESTIC_PURGE_RETURN=$?
+    : "${GOTIFYHOST:?Environment variable GOTIFYHOST is not set (required when ENABLE_GOTIFY=true)}"
-
+    : "${GOTIFYTOKEN:?Environment variable GOTIFYTOKEN is not set (required when ENABLE_GOTIFY=true)}"
-if [ $RESTIC_PURGE_RETURN -eq 0 ]; then
+    : "${GOTIFYTOPIC:?Environment variable GOTIFYTOPIC is not set (required when ENABLE_GOTIFY=true)}"
-    echo "$(date +"%Y-%m-%dT%T") - Purge successful"
 else
-    MSG_PURGE_ERR="Purge failed with error code $MSG_PURGE_ERR"
+    log "Gotify notifications disabled. Backup status will be logged to console only."
-    echo "$(date +"%Y-%m-%dT%T") - $MSG_PURGE_ERR"
-    curl -s -X POST "$GOTIFYURL" -F "title=$GOTIFYTOPIC" -F "message=$MSG_PURGE_ERR"
-    exit $RESTIC_PURGE_RETURN
 fi
 
-echo "$(date +"%Y-%m-%dT%T") - Going back to sleep..."
+# Restic encryption password.
+: "${RESTIC_PASSWORD:?Environment variable RESTIC_PASSWORD is not set}"
+
+# Use the repository URI directly from the environment.
+# Example: export RESTIC_REPOSITORY="rest:http://your-rest-server:8000/backup"
+: "${RESTIC_REPOSITORY:?Environment variable RESTIC_REPOSITORY is not set}"
+
+#######################################
+# Validate operation mode.
+#######################################
+case "$OPERATION_MODE" in
+    backup|restore)
+        ;;
+    *)
+        echo "Error: Unknown operation mode '$OPERATION_MODE'. Valid modes are 'backup' and 'restore'." >&2
+        exit 1
+        ;;
+esac
+
+#######################################
+# Validate mode-specific environment variables.
+#######################################
+case "$BACKUP_MODE" in
+    directory)
+        if [ "$OPERATION_MODE" = "backup" ]; then
+            : "${SOURCEDIR:?Environment variable SOURCEDIR is not set (required for directory backup mode)}"
+        elif [ "$OPERATION_MODE" = "restore" ]; then
+            : "${RESTOREDIR:?Environment variable RESTOREDIR is not set (required for directory restore mode)}"
+        fi
+        ;;
+    postgres)
+        : "${PGHOST:?Environment variable PGHOST is not set (required for PostgreSQL mode)}"
+        : "${PGDATABASE:?Environment variable PGDATABASE is not set (required for PostgreSQL mode)}"
+        : "${PGUSER:?Environment variable PGUSER is not set (required for PostgreSQL mode)}"
+        # Optional: default PGPORT to 5432.
+        : "${PGPORT:=5432}"
+        if [ -z "${PGPASSWORD:-}" ]; then
+            if [ "$OPERATION_MODE" = "backup" ]; then
+                echo "Warning: Environment variable PGPASSWORD is not set. pg_dump may fail if authentication is required."
+            elif [ "$OPERATION_MODE" = "restore" ]; then
+                echo "Warning: Environment variable PGPASSWORD is not set. psql may fail if authentication is required."
+            fi
+        fi
+        ;;
+    *)
+        echo "Error: Unknown backup mode '$BACKUP_MODE'. Valid modes are 'directory' and 'postgres'." >&2
+        exit 1
+        ;;
+esac
+
+#######################################
+# Build the Gotify URL (only if Gotify is enabled).
+#######################################
+if [ "$ENABLE_GOTIFY" = "true" ]; then
+    GOTIFYURL="${GOTIFYHOST}/message?token=${GOTIFYTOKEN}"
+fi
+
+#######################################
+# Send a notification via Gotify.
+# Arguments:
+#   message: The message to send.
+#######################################
+send_notification() {
+    local message="$1"
+    
+    # Only send notification if Gotify is enabled
+    if [ "$ENABLE_GOTIFY" != "true" ]; then
+        log "$message"
+        return 0
+    fi
+    
+    if ! curl -s -X POST "$GOTIFYURL" -F "title=${GOTIFYTOPIC}" -F "message=${message}" >/dev/null; then
+        log "Warning: Failed to send notification with message: ${message}"
+    fi
+}
+
+#######################################
+# Run the backup using restic.
+# The --no-cache flag disables local caching.
+# Arguments:
+#   $1 - The source directory to back up.
+#######################################
+run_restic_backup() {
+    local source_dir="$1"
+    cd "${source_dir}"
+    log "Starting backup of '${source_dir}' to repository ${RESTIC_REPOSITORY}"
+    # Capture both stdout and stderr in a variable
+    backup_output=$(restic -r "${RESTIC_REPOSITORY}" backup --no-cache --json --verbose . 2>&1)
+    # Optionally, also print the output to the console:
+    echo "$backup_output"
+    # Parse the JSON lines output for the summary message
+    summary=$(echo "$backup_output" | jq -r 'select(.message_type=="summary") | "Snapshot " + (.snapshot_id // "none") + ": " + "files new: " + (.files_new|tostring) + ", files changed: " + (.files_changed|tostring) + ", data added: " + (.data_added|tostring) + " bytes in " + (.total_duration|tostring) + " sec"')
+    # Check exit code of restic backup (assuming restic exits non-zero on error)
+    if [ $? -eq 0 ]; then
+        msg="Backup successful. $summary"
+        log "$msg"
+        send_notification "$msg"
+    else
+        exit_code=$?
+        msg="Backup failed with error code ${exit_code}. $backup_output"
+        log "$msg"
+        send_notification "$msg"
+        exit "$exit_code"
+    fi
+}
+
+
+#######################################
+# Backup a directory (regular mode).
+#######################################
+backup_directory() {
+    run_restic_backup "${SOURCEDIR}"
+}
+
+#######################################
+# Backup a PostgreSQL database.
+# Dumps the database to a temporary directory and then backs it up.
+#######################################
+backup_postgres() {
+    log "Starting PostgreSQL backup for database '${PGDATABASE}' on host '${PGHOST}'"
+    
+    # Create a temporary directory for the database dump.
+    TEMP_BACKUP_DIR=$(mktemp -d)
+    log "Created temporary directory: ${TEMP_BACKUP_DIR}"
+
+    local dump_file="${TEMP_BACKUP_DIR}/dump.sql"
+    log "Dumping PostgreSQL database to ${dump_file}..."
+    if pg_dump -h "${PGHOST}" -p "${PGPORT}" -U "${PGUSER}" ${PG_DUMP_ARGS:-} "${PGDATABASE}" > "${dump_file}"; then
+        log "Database dump created successfully."
+    else
+        local exit_code=$?
+        local msg="PostgreSQL dump failed with error code ${exit_code}"
+        log "$msg"
+        send_notification "$msg"
+        exit "$exit_code"
+    fi
+
+    # Back up the directory containing the dump.
+    run_restic_backup "${TEMP_BACKUP_DIR}"
+}
+
+#######################################
+# Run the restore using restic.
+# Arguments:
+#   $1 - The target directory to restore to.
+#   $2 - Optional snapshot ID to restore (defaults to latest).
+#######################################
+run_restic_restore() {
+    local target_dir="$1"
+    local snapshot_id="$2"
+    
+    log "Starting restore from repository ${RESTIC_REPOSITORY} to '${target_dir}'"
+    log "Using snapshot: ${snapshot_id}"
+    
+    # Create target directory if it doesn't exist
+    mkdir -p "${target_dir}"
+    
+    # Capture both stdout and stderr in a variable
+    restore_output=$(restic -r "${RESTIC_REPOSITORY}" restore "${snapshot_id}" --target "${target_dir}" --no-cache --json --verbose 2>&1)
+    # Optionally, also print the output to the console:
+    echo "$restore_output"
+    
+    # Parse the JSON lines output for the summary message
+    summary=$(echo "$restore_output" | jq -r 'select(.message_type=="summary") | "Restore completed: " + (.files_restored|tostring) + " files restored, " + (.bytes_restored|tostring) + " bytes in " + (.total_duration|tostring) + " sec"' 2>/dev/null || echo "Restore completed")
+    
+    # Check exit code of restic restore
+    if [ $? -eq 0 ]; then
+        msg="Restore successful. $summary"
+        log "$msg"
+        send_notification "$msg"
+    else
+        exit_code=$?
+        msg="Restore failed with error code ${exit_code}. $restore_output"
+        log "$msg"
+        send_notification "$msg"
+        exit "$exit_code"
+    fi
+}
+
+#######################################
+# Restore a directory (regular mode).
+#######################################
+restore_directory() {
+    local snapshot_id="${RESTORE_SNAPSHOT_ID:-latest}"
+    run_restic_restore "${RESTOREDIR}" "${snapshot_id}"
+}
+
+#######################################
+# Restore a PostgreSQL database.
+# Restores the database dump from the backup and applies it to the database.
+#######################################
+restore_postgres() {
+    local snapshot_id="${RESTORE_SNAPSHOT_ID:-latest}"
+    log "Starting PostgreSQL restore for database '${PGDATABASE}' on host '${PGHOST}'"
+    
+    # Create a temporary directory for the restore.
+    TEMP_RESTORE_DIR=$(mktemp -d)
+    log "Created temporary directory: ${TEMP_RESTORE_DIR}"
+
+    # Restore the backup to the temporary directory
+    run_restic_restore "${TEMP_RESTORE_DIR}" "${snapshot_id}"
+    
+    local dump_file="${TEMP_RESTORE_DIR}/dump.sql"
+    if [ ! -f "${dump_file}" ]; then
+        local msg="PostgreSQL restore failed. Database dump file not found at ${dump_file}"
+        log "$msg"
+        send_notification "$msg"
+        exit 1
+    fi
+    
+    log "Restoring PostgreSQL database from ${dump_file}..."
+    if psql -h "${PGHOST}" -p "${PGPORT}" -U "${PGUSER}" -d "${PGDATABASE}" ${PSQL_ARGS:-} < "${dump_file}"; then
+        local msg="PostgreSQL database restored successfully"
+        log "$msg"
+        send_notification "$msg"
+    else
+        local exit_code=$?
+        local msg="PostgreSQL restore failed with error code ${exit_code}"
+        log "$msg"
+        send_notification "$msg"
+        exit "$exit_code"
+    fi
+}
+
+#######################################
+# Cleanup temporary resources.
+#######################################
+cleanup() {
+    if [ -n "${TEMP_BACKUP_DIR:-}" ] && [ -d "${TEMP_BACKUP_DIR}" ]; then
+        rm -rf "${TEMP_BACKUP_DIR}"
+        log "Removed temporary directory ${TEMP_BACKUP_DIR}"
+    fi
+    if [ -n "${TEMP_RESTORE_DIR:-}" ] && [ -d "${TEMP_RESTORE_DIR}" ]; then
+        rm -rf "${TEMP_RESTORE_DIR}"
+        log "Removed temporary directory ${TEMP_RESTORE_DIR}"
+    fi
+}
+trap cleanup EXIT
+
+#######################################
+# Main routine.
+#######################################
+main() {
+    case "$OPERATION_MODE" in
+        backup)
+            case "$BACKUP_MODE" in
+                directory)
+                    backup_directory
+                    ;;
+                postgres)
+                    backup_postgres
+                    ;;
+            esac
+            ;;
+        restore)
+            case "$BACKUP_MODE" in
+                directory)
+                    restore_directory
+                    ;;
+                postgres)
+                    restore_postgres
+                    ;;
+            esac
+            ;;
+    esac
+}
+
+# Trap termination signals to log and exit cleanly.
+trap 'log "Script interrupted. Exiting."; exit 1' SIGINT SIGTERM
+
+main

src/entry.sh

@@ -1,18 +0,0 @@
-#!/bin/sh
-
-mkdir /etc/cron.d
-touch /etc/cron.d/backup
-echo "$INTERVAL /bin/sh /app/backup.sh" > /etc/cron.d/backup
-
-# change ownership and make the cron known to crontab
-chmod 0644 /etc/cron.d/backup && crontab /etc/cron.d/backup
-
-
-if [ $RUNONSTART = 'true' ]; then
-    echo $(date +"%Y-%m-%dT%T") "- Running initial backup"
-    /bin/sh /app/backup.sh
-fi
-
-# Wait until infinity
-echo $(date +"%Y-%m-%dT%T") "- Starting cron"
-crond -f