Fix: Hostnames should not be cropped

runtimes/aleph-alpine-3.13-python/init1.py

@@ -1,5 +1,5 @@
 #!/usr/bin/python3 -OO
-
+import base64
 import logging
 
 logging.basicConfig(
@@ -451,8 +451,11 @@ def receive_config(client) -> ConfigurationPayload:
 
 
 def setup_system(config: ConfigurationPayload):
- # hostname labels are limited to 63 characters
- setup_hostname(config.vm_hash[0:63])
+ # Linux host names are limited to 63 characters. We therefore use the base32 representation
+ # of the item_hash instead of its common base16 representation.
+ item_hash_binary: bytes = base64.b16decode(config.vm_hash.encode().upper())
+ hostname = base64.b32encode(item_hash_binary).decode().strip('=').lower()
+ setup_hostname(hostname)
 
  setup_variables(config.variables)
  setup_volumes(config.volumes)