List index out of range

[RMeli]

  File "/users/rmeli/.local-aarch64/share/../bin/machinestate", line 10, in <module>
    sys.exit(main())
             ~~~~^^
  File "/users/rmeli/.local-aarch64/share/uv/tools/machinestate/lib/python3.14/site-packages/machinestate.py", line 3733, in main
    mstate.update()
    ~~~~~~~~~~~~~^^
  File "/users/rmeli/.local-aarch64/share/uv/tools/machinestate/lib/python3.14/site-packages/machinestate.py", line 839, in update
    inst.update()
    ~~~~~~~~~~~^^
  File "/users/rmeli/.local-aarch64/share/uv/tools/machinestate/lib/python3.14/site-packages/machinestate.py", line 836, in update
    data = op.parse(data)
  File "/users/rmeli/.local-aarch64/share/uv/tools/machinestate/lib/python3.14/site-packages/machinestate.py", line 590, in parse
    out = self.parser(data)
  File "/users/rmeli/.local-aarch64/share/uv/tools/machinestate/lib/python3.14/site-packages/machinestate.py", line 3075, in parsemodules
    if re.match("^Currently Loaded.+$", slist[0]):
                                        ~~~~~^^^
IndexError: list index out of range

Steps to reproduce:

$ uv tool install MachineState
Resolved 1 package in 598ms
Prepared 1 package in 175ms
Installed 1 package in 63ms
 + machinestate==0.6.0
Installed 1 executable: machinestate
$ machinestate

[spooseh]

After a recent Lmod update, the output of

$LMOD_CMD sh -t list

may differ from what the parser expects, resulting in an empty slist. The current workaround only handles the first empty case but the fallback slist could still be empty.

A simple fix would be to add:

if not slist:
    return [] # or the whole value for debugging

Until the code base is updated, one could obtain the loaded modules via LOADEDMODULES, if available:

if os.getenv("LOADEDMODULES"):
    self.const("Loaded", os.getenv("LOADEDMODULES").split(":"))
elif os.getenv("LMOD_CMD"):
    ...

[RMeli]

Yes, the fix should be reasonably simple.

In our case we have

$ $LMOD_CMD --version

Modules based on Lua: Version 8.7.17  2023-01-12 15:02 -06:00
    by Robert McLay mclay@tacc.utexas.edu

but there are no loaded nor available modules.

[juniorcastro0152-hub]

mod_inv_tests.txt

[TomTheBear]

Thanks for the issue. I was on vacation. I will take a look and hopefully get someone to build a huge CI to test the various backends in MachineState.

[TomTheBear]

Can you provide the output of 8.7.17 without a module loaded and with multiple modules loaded? Although it would be better best would be a CI step installing different versions of modules (legacy and Lua version), this would be huge if we do it for all components. So maybe the way to go is with class tests with valid outputs.