don't rename import as link2xt prefers

cmdeploy/src/cmdeploy/remote/rdns.py

@@ -12,7 +12,7 @@ All functions of this module
 
 import re
 
-from .rshell import ShellError, shell
+from .rshell import CalledProcessError, shell
 
 
 def perform_initial_checks(mail_domain):
@@ -44,7 +44,7 @@ def get_dkim_entry(mail_domain, dkim_selector):
             f"openssl rsa -in /etc/dkimkeys/{dkim_selector}.private "
             "-pubout 2>/dev/null | awk '/-/{next}{printf(\"%s\",$0)}'"
         )
-    except ShellError:
+    except CalledProcessError:
         return
     dkim_value_raw = f"v=DKIM1;k=rsa;p={dkim_pubkey};s=email;t=s"
     dkim_value = '" "'.join(re.findall(".{1,255}", dkim_value_raw))

cmdeploy/src/cmdeploy/remote/rshell.py

@@ -1,12 +1,11 @@
-from subprocess import CalledProcessError as ShellError
-from subprocess import check_output
+from subprocess import CalledProcessError, check_output
 
 
 def shell(command, fail_ok=False):
     print(f"$ {command}")
     try:
         return check_output(command, shell=True).decode().rstrip()
-    except ShellError:
+    except CalledProcessError:
         if not fail_ok:
             raise
         return ""