update postgres from 12 to 13

.drone.yml

@@ -17,6 +17,8 @@ steps:
       DOMAIN: {{ .Name }}.swarm-test.autonomic.zone
       STACK_NAME: {{ .Name }}
       LETS_ENCRYPT_ENV: production
+      PG_BACKUP_VERSION: v1
+      PRETIX_CONFIG_VERSION: v1
 trigger:
   branch:
     - main

.env.sample

@@ -2,6 +2,8 @@ TYPE=pretix
 
 DOMAIN=pretix.example.com
 
+ENABLE_BACKUPS=true
+
 ## Domain aliases
 #EXTRA_DOMAINS=', `www.pretix.example.com`'
 
@@ -16,4 +18,4 @@ SMTP_HOST=127.0.0.71
 SMTP_USER=pretix
 SMTP_PORT=1025
 SMTP_TLS=on
-SMTP_SSL=off
+SMTP_SSL=off

abra.sh

@@ -1 +1,2 @@
 export PRETIX_CONFIG_VERSION=v1
+export PG_BACKUP_VERSION=v1

compose.yml

@@ -34,7 +34,7 @@ services:
     #   start_period: 1m
 
   db:
-    image: postgres:12
+    image: postgres:13
     volumes:
       - "postgres:/var/lib/postgresql/data"
     networks:
@@ -52,9 +52,15 @@ services:
       retries: 5
     deploy:
       labels:
-            backupbot.backup: "true"
-            backupbot.backup.pre-hook: "PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /var/lib/postgresql/data/backup.sql"
-            backupbot.backup.post-hook: "rm -rf /var/lib/postgresql/data/backup.sql"
+        backupbot.backup: "${ENABLE_BACKUPS:-true}"
+        backupbot.backup.pre-hook: "/pg_backup.sh backup"
+        backupbot.backup.volumes.postgres.path: "backup.sql"
+        backupbot.restore.post-hook: '/pg_backup.sh restore'
+        backupbot.backup.volumes.redis: "false"
+    configs:
+        - source: pg_backup
+          target: /pg_backup.sh
+          mode: 0555
 
   redis:
     image: redis:7.0.10-alpine
@@ -78,6 +84,9 @@ configs:
     name: ${STACK_NAME}_pretix_config_${PRETIX_CONFIG_VERSION}
     file: pretix.cfg.tmpl
     template_driver: golang
+  pg_backup:
+    name: ${STACK_NAME}_pg_backup_${PG_BACKUP_VERSION}
+    file: pg_backup.sh
 
 networks:
   proxy:

pg_backup.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+set -e
+
+BACKUP_FILE='/var/lib/postgresql/data/backup.sql'
+
+function backup {
+  export PGPASSWORD=$(cat $POSTGRES_PASSWORD_FILE)
+  pg_dump -U ${POSTGRES_USER} ${POSTGRES_DB} > $BACKUP_FILE
+}
+
+function restore {
+    cd /var/lib/postgresql/data/
+    restore_config(){
+        # Restore allowed connections
+        cat pg_hba.conf.bak > pg_hba.conf
+        su postgres -c 'pg_ctl reload'
+    }
+    # 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'
+    trap restore_config EXIT INT TERM
+
+    # 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 $BACKUP_FILE
+
+    trap - EXIT INT TERM
+    restore_config
+}
+
+$@

release/next

@@ -0,0 +1 @@
+Postgres update: please do a backup before the upgrade, remove the postgres volume and restore it after the upgrade