update prepare script

scripts/prepare_singularity.py

 #!/usr/bin/python3
 import os
 import sys
-import json
 
 
 def get_job_ad():
@@ -16,7 +15,7 @@ def get_job_ad():
         if " = " in line:
             key = line.split(" = ")[0]
             value = line.replace(f"{key} = ", "")
-            job_ad[key.strip()] = value.strip()
+            job_ad[key.strip().replace('"', "")] = value.strip().replace('"', "")
     return job_ad
 
 
@@ -56,10 +55,11 @@ def check_image_availability(image_path):
 def main():
     job_ad = get_job_ad()
     status_message = ""
-    # write job_ad to a json file for debugging
-    dumpfilepath = "/scratch/job_ad.json"
+    # write job_ad to a file for debugging
+    dumpfilepath = "/scratch/job_ad_initial.json"
     with open(dumpfilepath, "w") as f:
-        json.dump(job_ad, f, indent=4)
+        for key, value in job_ad.items():
+            f.write(f"{key} = {value}\n")
     container_image = job_ad.get("ContainerImage")
     docker_image = job_ad.get("DockerImage")
 
@@ -73,8 +73,10 @@ def main():
             "/cvmfs/unpacked.cern.ch/registry.hub.docker.com/mschnepf/slc7-condocker:latest"
         )
         job_ad["WantDocker"] = "false"
+        dumpfilepath = "/scratch/job_ad_updated.json"
         with open(dumpfilepath, "w") as f:
-            json.dump(job_ad, f, indent=4)
+            for key, value in job_ad.items():
+                f.write(f"{key} = {value}\n")
         return
     # pick the args parameter that is not None
     image = container_image or docker_image
@@ -90,8 +92,10 @@ def main():
     # dump the updated job ad to a file for debugging
     job_ad["ContainerImage"] = condor_arg
     job_ad["WantDocker"] = "false"
+    dumpfilepath = "/scratch/job_ad_updated.json"
     with open(dumpfilepath, "w") as f:
-        json.dump(job_ad, f, indent=4)
+        for key, value in job_ad.items():
+            f.write(f"{key} = {value}\n")
     status_message = f"Container image {image_path} is available, using it"
     print(f"HookStatusMessage = {status_message}")