if gcs_bucket is provided, use it or fail

containers/datalab/content/GCSbackup.sh

@@ -96,10 +96,20 @@ timestamp=$(date "+%Y%m%d%H%M%S")
 project_id=${project_id:-$VM_PROJECT}
 zone=${zone:-${VM_ZONE}}
 machine_name=${machine_name:-$VM_NAME}
-default_bucket="${project_id}.appspot.com"
 tag="${tag:-backup}"
 num_backups=${num_backups:-10}
-gcs_bucket=${gcs_bucket:-$default_bucket}
+
+# If no bucket is provided, try $project_id.appspot.com, then try $project_id
+if [ -z "${gcs_bucket}" ]; then
+  default_bucket="${project_id}.appspot.com"
+  echo "Will use ${default_bucket} for bucket name"
+  gsutil ls "gs://${default_bucket}" &>/dev/null && gcs_bucket="${default_bucket}" || {
+    gcs_bucket=${project_id}
+    echo "Could not find ${default_bucket}. Next will use ${gcs_bucket} for bucket name"
+    gsutil mb gs://"${gcs_bucket}" || true
+  }
+fi
+
 backup_path=`readlink -f "${backup_path:-.}"`
 
 echo "tag: ${tag}"
@@ -120,16 +130,6 @@ if [[ -z $machine_name || -z $project_id || -z $zone ]]; then
   exit 1
 fi
 
-# test and create bucket if necessary
-gsutil ls gs://${gcs_bucket} &>/dev/null || {
-  echo "Bucket '${gcs_bucket}' was not found. Creating it.."
-  gsutil mb gs://"${gcs_bucket}" || {
-    echo "Bucket '${gcs_bucket}' coult not be created. Will try bucket name ${project_id}"
-    gcs_bucket="${project_id}"
-    gsutil mb gs://"${gcs_bucket}" || true
-  }
-}
-
 # create an archive of the backup path
 archive_name=$(mktemp -d)"/archive.tar"
 echo "Creating archive: $archive_name"