check if bucket and bucket_prefix given in back_projection workflow

src/hyp3_srg/back_projection.py

@@ -92,6 +92,7 @@ def back_project(
     earthdata_password: str = None,
     bucket: str = None,
     bucket_prefix: str = '',
+    use_gslc_prefix: bool = False,
     work_dir: Optional[Path] = None,
     gpu: bool = False,
 ):
@@ -104,9 +105,15 @@ def back_project(
         earthdata_password: Password for NASA's EarthData service
         bucket: AWS S3 bucket for uploading the final product(s)
         bucket_prefix: Add a bucket prefix to the product(s)
+        use_gslc_prefix: Upload GSLCs to a subprefix
         work_dir: Working directory for processing
         gpu: Use the GPU-based version of the workflow
     """
+    if use_gslc_prefix:
+        if not (bucket and bucket_prefix):
+            raise ValueError('bucket and bucket_prefix must be given if use_gslc_prefix is True')
+        bucket_prefix += '/GSLC_granules'
+
     utils.set_creds('EARTHDATA', earthdata_username, earthdata_password)
     if work_dir is None:
         work_dir = Path.cwd()
@@ -167,17 +174,12 @@ def main():
     )
     parser.add_argument('granules', type=str.split, nargs='+', help='Level-0 S1 granule(s) to back-project.')
     args = parser.parse_args()
-
     args.granules = [item for sublist in args.granules for item in sublist]
-
     if args.bounds is not None:
         args.bounds = [float(item) for sublist in args.bounds for item in sublist]
         if len(args.bounds) != 4:
             parser.error('Bounds must have exactly 4 values: [min lon, min lat, max lon, max lat] in EPSG:4326.')
 
-    if args.use_gslc_prefix:
-        args.bucket_prefix += '/GSLC_granules'
-
     back_project(**args.__dict__)