Extension volume doesn't support default arguments. Please extend it.

[AndreasAZiegler]

I just noticed that the rocker command I usually use

TERM=xterm rocker --x11 --user --home --privileged --env TERM=xterm --name ros-dev --volume /dev/bus/usb:/dev/bus/usb --volume /data:/data --network=host  -- table-tennis-ros2

is now throwing the error

Extension volume doesn't support default arguments. Please extend it.
Active extensions ['env', 'home', 'name', 'network', 'privileged', 'volume', 'x11', 'user']
Traceback (most recent call last):
  File "/usr/bin/rocker", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/lib/python3.12/site-packages/rocker/cli.py", line 64, in main
    dig = DockerImageGenerator(active_extensions, args_dict, base_image)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/rocker/core.py", line 209, in __init__
    self.dockerfile = generate_dockerfile(active_extensions, self.cliargs, base_image)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/rocker/core.py", line 348, in generate_dockerfile
    dockerfile_str += el.get_snippet(args_dict) + '\n'
                      ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/rocker/extensions.py", line 298, in get_snippet
    return em.expand(snippet, substitutions)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/em.py", line 5961, in expand
    result = interp.expand(data, locals, name, dispatcher=None)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/em.py", line 4681, in expand
    self.string(data, locals, dispatcher)
  File "/usr/bin/em.py", line 4830, in string
    while not self.safe(scanner, True, locals, dispatcher):
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/em.py", line 4862, in safe
    if dispatcher():
       ^^^^^^^^^^^^
  File "/usr/bin/em.py", line 4843, in safe
    return self.parse(scanner, locals)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/em.py", line 4870, in parse
    token = scanner.one()
            ^^^^^^^^^^^^^
  File "/usr/bin/em.py", line 3999, in one
    token.scan(self)
  File "/usr/bin/em.py", line 2648, in scan
    self.subscan(scanner, self.type)
  File "/usr/bin/em.py", line 2664, in subscan
    token = scanner.one()
            ^^^^^^^^^^^^^
  File "/usr/bin/em.py", line 3999, in one
    token.scan(self)
  File "/usr/bin/em.py", line 2648, in scan
    self.subscan(scanner, self.type)
  File "/usr/bin/em.py", line 2664, in subscan
    token = scanner.one()
            ^^^^^^^^^^^^^
  File "/usr/bin/em.py", line 3995, in one
    raise ParseError("unknown markup sequence: `%s%s`%s" % (self.config.prefix, first, self.factory.addendum(first)))
em.ParseError: unknown markup sequence: `@((`; extension markup `@((...))` invoked with no installed extension

There was a docker update vom 1:27.2.0-1 to 1:27.2.1-1 which I assume causes the troubles but I'm not sure.

[tfoote]

The deprecation warning at the top about the volume extension default arguments is not the error you're seeing. I opened a PR for fixing that in #288

This looks like an empy parsing issue. Do you have a new version of empy what installation mechanism are you using?

Can you reduce the number of arguments and use a standard image like ubuntu to reproduce the issue?