add backup script

abra.sh

@@ -17,6 +17,7 @@ export RALLLY_CONFIG_VERSION=v2
 export HEDGEDOC_CONFIG_VERSION=v1
 export MONITORING_CONFIG_VERSION=v2
 export DB_ENTRYPOINT_VERSION=v1
+export PG_BACKUP_VERSION=v1
 
 customize() {
     if [ -z "$1" ]

compose.yml

@@ -124,6 +124,9 @@ services:
       - source: db_entrypoint
         target: /docker-entrypoint.sh
         mode: 0555
+      - source: pg_backup
+        target: /pg_backup.sh
+        mode: 0555
     entrypoint:
       /docker-entrypoint.sh
     volumes:
@@ -143,11 +146,11 @@ services:
     deploy:
       labels:
           backupbot.backup: "true"
-          backupbot.backup.pre-hook: "PGPASSWORD=$$(cat /run/secrets/db_password) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /var/lib/postgresql/data/backup.sql"
+          backupbot.backup.pre-hook: "/pg_backup.sh backup"
           backupbot.backup.post-hook: "rm -rf /var/lib/postgresql/data/backup.sql"
           backupbot.backup.volumes.database.path: "backup.sql"
           backupbot.backup.volumes.redis: "false"
-          backupbot.restore.post-hook: 'psql -U authentik -d postgres -c "DROP DATABASE authentik WITH (FORCE);" && createdb -U authentik authentik && psql -U authentik -d authentik -f /var/lib/postgresql/data/backup.sql'
+          backupbot.restore.post-hook: '/pg_backup.sh restore'
 
   redis:
     image:  redis:7.4.0-alpine
@@ -222,3 +225,6 @@ configs:
     name: ${STACK_NAME}_db_entrypoint_${DB_ENTRYPOINT_VERSION}
     file: entrypoint.postgres.sh.tmpl
     template_driver: golang
+  pg_backup:
+    name: ${STACK_NAME}_pg_backup_${PG_BACKUP_VERSION}
+    file: pg_backup.sh

pg_backup.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -e
+
+BACKUP_FILE='/var/lib/postgresql/data/backup.sql'
+
+function backup {
+  export PGPASSWORD=$(cat /run/secrets/db_password)
+  pg_dump -U ${POSTGRES_USER} ${POSTGRES_DB} > $BACKUP_FILE
+}
+
+function restore {
+    cd /var/lib/postgresql/data/
+    # Don't allow any other connections than local
+    cp pg_hba.conf pg_hba.conf.bak
+    echo "local all all trust" > pg_hba.conf
+    su postgres -c 'pg_ctl reload'
+    # Recreate Database
+    psql -U ${POSTGRES_USER} -d postgres -c "DROP DATABASE ${POSTGRES_DB} WITH (FORCE);" 
+    createdb -U ${POSTGRES_USER} ${POSTGRES_DB}
+    psql -U ${POSTGRES_USER} -d ${POSTGRES_DB} -1 -f $BACKUP_FILE
+    # Restore allowed connections
+    cat pg_hba.conf.bak > pg_hba.conf
+    su postgres -c 'pg_ctl reload'
+}
+
+$@