only run nixos-generate-config in upd when a flag is given

this prevents the system from breaking on reboot when a docker container
or other storage mount is provided in the hardware configuration but is
not accessible anymore when booting

config/xonsh/aliases.py

@@ -55,6 +55,8 @@ def _upd(args: list):
             "Visual Studio Code user settings": ".config/Code/User/settings.json.bak",
             "fontconfig": ".config/fontconfig/conf.d/10-hm-fonts.conf.bak"
         }
+        if "--rewrite-hardware-configuration" in args:
+            args.remove("--rewrite-hardware-configuration")
             print(f"{c.BLUE}Updating {c.YELLOW}NixOS{c.BLUE} hardware configuration file for {c.YELLOW}{gethostname()}{c.BLUE}{c.END}")
             run(["sudo", "nixos-generate-config", "--dir", ".",], cwd=path / "hosts")
             print(f"{c.BLUE}Deleting redundant {c.YELLOW}NixOS{c.BLUE} configuration file{c.END}")