Usage

Author: DerekRoberts

db/db_transfer.sh

@@ -1,20 +1,27 @@
 #!/bin/bash
 #
-# Database Upgrade/Migration Script for OpenShift
+# Database Transfer Script for OpenShift
 # Usage:
-#   ./dbUpgrade.sh <old-deployment-name> <new-deployment-name>
+#   ./db_transfer.sh <old-deployment-name> <new-deployment-name>
 #
-# This script takes a database dump from the OLD_DEPLOYMENT and restores it into the NEW_DEPLOYMENT.
+# This script takes a PostgreSQL database dump from the OLD_DEPLOYMENT and restores it into the NEW_DEPLOYMENT.
 # Requirements:
-# - Both deployments must have running pods with the correct labels.
+# - Both deployments must have running pods managed by the given deployment names.
 # - The database template should use a PersistentVolumeClaim with a different name for the new deployment.
 # - The new deployment should be ready to accept a restore.
+# - The script assumes the container name is the default or the first in the pod spec.
+#
+# Notes:
+# - If the target database is not empty, you may see errors like "schema ... already exists".
+#   These are expected if objects already exist and can usually be ignored, but always review
+#   the output for unexpected or
 
 # Strict mode with verbose output
 set -euxo pipefail
 
+# Usage
 if [[ $# -lt 2 ]]; then
-  echo "Usage: $0 <old-deployment-name> <new-deployment-name>"
+  grep -v '^#!' "$0" | awk '/^#/ { sub(/^# ?/, ""); print; next } NF==0 { exit }'
   exit 1
 fi
 
@@ -24,7 +31,6 @@ NEW_DEPLOYMENT=${2}
 DUMP_FILE_PATH=/tmp/backup.dump
 
 # Create dump from the old deployment and save locally
-OLD_POD=$(oc get po -l deployment=${OLD_DEPLOYMENT} -o name | head -n 1 | sed 's|pod/||')
 oc exec -i deployment/${OLD_DEPLOYMENT} -- bash -c "pg_dump -U \${POSTGRES_USER} -d \${POSTGRES_DB} -Fc" > ${DUMP_FILE_PATH}
 ls -lh ${DUMP_FILE_PATH}