Allow executing extra init scripts on initial migration

Author: manisandro

README.md

@@ -79,6 +79,10 @@ To apply the migrations, both as part as the initial setup and subsequently to k
       - ./pg_service.conf:/tmp/pg_service.conf:ro
 ```
 
+# Extra initialization
+
+You can mount additional scripts to perform initial DB setup to `/tmp/extra-init.d`. These scripts will only be executed after the initial DB migration (i.e. if `alembic current` was empty).
+
 # DB Schema overview
 
 ![er-diagram](er-diagram.png)

run-migrations.sh

@@ -5,4 +5,21 @@ until psql service=$PGSERVICE -c "select 1" > /dev/null 2>&1; do
   sleep 1
 done
 
+current_version=$(alembic current)
+echo "Current version: ${current_version}"
+
+
 alembic upgrade ${ALEMBIC_VERSION}
+
+if [ -z "$current_version" ] && [ -d "/tmp/extra-init.d" ]; then
+  echo "Executing scripts in /tmp/extra-init.d..."
+  for script in /tmp/extra-init.d/*; do
+    if [ -f "$script" ] && [ -x "$script" ]; then
+      echo "Running $script..."
+      "$script"
+    elif [ -f "$script" ]; then
+      echo "Running $script with sh..."
+      sh "$script"
+    fi
+  done
+fi