add SPACK_ICON_NWP_GITTOKEN to icon-nwp spack package to set an access token...

add SPACK_ICON_NWP_GITTOKEN to icon-nwp spack package to set an access token through environment variable

spack_repo/packages/icon-nwp/package.py

@@ -4,6 +4,8 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 from pathlib import Path
+import os
+from urllib.parse import urlparse
 
 from spack.package import *
 
@@ -68,7 +70,17 @@ class IconNwp(Package):
     def do_fetch(self, mirror_only=False):
         # FIXME: Using the custom_fetchers workaround
         source = self.spec.variants['source'].value
-        self.fetcher[0].url = self.git = self.custom_fetchers[source]
+        url = self.custom_fetchers[source]
+
+        token = os.environ.get('SPACK_ICON_NWP_GITTOKEN')
+        if token is not None:
+            if 'https' in url:
+                parsed = urlparse(url)
+                user = 'token'
+                password = token
+                url = "{}://{}:{}@{}/{}".format(parsed.scheme, user, password, parsed.netloc, parsed.path)
+
+        self.fetcher[0].url = self.git = url
 
         super(IconNwp, self).do_fetch(mirror_only)