refactor script

README.md

@@ -1,20 +1,106 @@
-# backupsidecar
+# BackupSidecar
 
-Backup sidecar that automatically creates backups of one PVC and saves it to another PVC via restic
+BackupSidecar is a lightweight backup solution designed to run as a cron job in Kubernetes. It automates backups using Restic and supports both directory and PostgreSQL database backups. Notifications are sent via Gotify to keep you informed of backup results.
 
-## Function
-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.
+## Configuration
 
-## Environment Variables
-| ENV Variable | Required |Description| Example Value
-|--------------|----------|--------------|-
-|INTERVAL|yes|cronjob interval string|15 14 * * *|
-|RESTIC_REPOSITORY|yes|path of the restic repository|/mnt/backups/gitea|
-|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|
-|RESTIC_PASSWORD|yes|password for the restic repository|******|
-|RUNONSTART|no|set to true to force a backup at the start of the container|true|
-|GOTIFYHOST|yes|URL of the gotify server (without trailing slash)|https://gotify.example.com|
-|GOTIFYTOKEN|yes|gotify app token|******|
-|GOTIFYTOPIC|yes|gotify topic to include in the notification|gotify|
+BackupSidecar is configured through environment variables. Below is a breakdown of the available settings.
+
+### General Settings
+
+These variables apply to both directory and PostgreSQL backups.
+
+- **`BACKUP_MODE`** _(optional)_ – Defines the backup type (`directory` or `postgres`). Defaults to `directory`.
+- **`RESTIC_PASSWORD`** _(required)_ – The encryption password for Restic.
+- **`RESTIC_REPOSITORY`** _(required)_ – The URI of the Restic repository (e.g., `rest:http://your-rest-server:8000/backup`).
+- **`RESTIC_REST_USERNAME`** _(optional)_ – The username for REST server authentication.
+- **`RESTIC_REST_PASSWORD`** _(optional)_ – The password for REST server authentication.
+- **`GOTIFYHOST`** _(required)_ – The Gotify server URL.
+- **`GOTIFYTOKEN`** _(required)_ – The API token for Gotify.
+- **`GOTIFYTOPIC`** _(required)_ – The topic under which backup notifications will be sent.
+
+### Directory Backup
+
+When running in `directory` mode, the following variable must be set:
+
+- **`SOURCEDIR`** _(required)_ – The path of the directory to be backed up.
+
+### PostgreSQL Backup
+
+For `postgres` mode, the following database-related variables are required:
+
+- **`PGHOST`** _(required)_ – The hostname of the PostgreSQL server.
+- **`PGDATABASE`** _(required)_ – The name of the database to back up.
+- **`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.
+- **`PG_DUMP_ARGS`** _(optional)_ – Additional flags for `pg_dump`.
+
+## Dependencies
+
+Ensure the following commands are available in the container:
+
+- `restic`
+- `curl`
+- `jq`
+- `pg_dump` _(only required for `postgres` mode)_
+
+## Usage
+
+Example Kubernetes CronJob manifest for running BackupSidecar as a cron job for directory backups in minimal configuration:
+
+```yaml
+apiVersion: batch/v1beta1
+kind: CronJob
+metadata:
+  name: backupsidecar-cron
+spec:
+  schedule: "0 2 * * *" # Run daily at 2:00 AM
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          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: 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
+```
+
+## Notifications
+
+The script sends success or failure notifications via Gotify.
+
+Example success notification:
+
+```
+Backup successful. Snapshot 56ff6a909a44e01f67d2d88f9a76aa713d437809d7ed14a2361e28893f38befb: files new: 1, files changed: 0, data added: 1019 bytes in 0.277535184 sec
+```