Symptoms or Error
Customers cannot create new catalogs or update the images of existing catalogs.

Solution

Citrix is currently working on a fix.

Workaround: 

Customers can update the json files to use a newer image and script.Below is the step-by-step process. There are 2 options to update the files. One uses gsutil which is a gcloud utility from Google and the other one is a manual process

Option 1 - Manual change

1. From your Google Cloud console, go to the following object:  
   GCP Console --> Cloud Storage --> Buckets --> citrix-mcs-prov-disks-<HostingUnitRegion>-<RandomCharacters>  --> daisy
   The bucket naming convention is: citrix-mcs-prov-disks-<HostingUnitRegion>-<RandomCharacters>
   
   Note: If you do not find the daisy folder or the bucket, proceed with creating a catalog. Although it will fail, it will generate the necessary bucket resources that we will modify in the following steps. 
   
2. Download files disk_export.wf.json and image_export_ext.wf.json from this location (Download button from file → it opens in browser → right click → Save as )
   
   
   
3. Modify the following lines at 18 in disk_export_ext.wf 
   

    "export_instance_disk_image": {
      "Value": "projects/compute-image-import/global/images/family/debian-9-worker",
      "Description": "image to use for the exporter instance"
    },

4. Similarly, modify image_export_ext.wf.json
5. Upload files back to the same place in GCP (Note: Make sure to remove the prefix daisy_ before uploading files)
6. Delete the rule called "Delete object" that discards these files after 1 day.  This rule can be located at
   GCP Console --> Cloud Storage --> Buckets --> <bucket> --> Lifecycle --> Rules
   
   Note: CVAD adds this rule each time a preparation machine is created. Therefore, you should delete this rule after each image preparation process (new catalog creation and master image update on existing catalog).
   If you choose not to delete this rule, you will need to repeat all the above steps each time you create a catalog or update an image. This is because the rule will discard the modified files.
7. If you have multiple hosting regions, make sure to follow the above steps for all the hosting unit regions. 

Option 2 - Using gsutil

1. Download and install gsutil from https://cloud.google.com/storage/docs/gsutil_install
2. Copy the gsutil path of json files disk_export_ext.wf.json and image_export_ext.wf.json from Google Cloud Console -> Storage -> Buckets -> citrix-mcs-prov-disks-<HostingUnitRegion>-<RandomCharacters>  -> daisy
   
3. Execute the attached PowerShell script using Google Cloud SDK Shell in Administrator mode (Make sure you have authenticated to gcloud using command gcloud auth)
   Update-Files.ps1
   

Problem Cause

GCP has modified the endpoints that are used to obtain image workers for daisy VMs. These endpoints are used by our MCS Plugin for the disk export process using Cloud Build. This modification by Google breaks our code and causes the image preparation process to fail during the catalog update or creation process.

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