ERROR: Unhandled python exception: KeyError: 'options'

[user202729]

Describe the bug

As in the title. I see that error. The full traceback is

  Traceback (most recent call last):
    File ".../mesonmain.py", line 193, in run
      return options.run_func(options)
             ~~~~~~~~~~~~~~~~^^^^^^^^^
    File ".../msetup.py", line 394, in run
      app.generate()
      ~~~~~~~~~~~~^^
    File ".../msetup.py", line 193, in generate
      return self._generate(env, capture, vslite_ctx)
             ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
    File ".../msetup.py", line 291, in _generate
      coredata.update_cmd_line_file(self.build_dir, self.options)
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File ".../coredata.py", line 644, in update_cmd_line_file
      config['options'].update({str(k): str(v) for k, v in options.cmd_line_options.items()})
      ~~~~~~^^^^^^^^^^^
    File ".../python3.13/configparser.py", line 1000, in __getitem__
      raise KeyError(key)
  KeyError: 'options'

To Reproduce

I do the following.

• Install mamba
• git clone SageMath.
• mamba env create -n sage-dev -f environment-3.13-linux.yml
• mamba activate sage-dev
• pip install --no-build-isolation --editable . --verbose

Then interrupt it in the middle of the "Generating targets" step (that step is quite slow)

  Generating targets:   0%|          | 0/1680 eta ?
  Generating targets:   3%|▎         | 49/1680 eta 00:03
  Generating targets:   8%|▊         | 139/1680 eta 00:02
  Generating targets:  14%|█▎        | 227/1680 eta 00:01
  Generating targets:  19%|█▉        | 318/1680 eta 00:01
  Generating targets:  24%|██▍       | 402/1680 eta 00:01
  Generating targets:  29%|██▉       | 491/1680 eta 00:01
  Generating targets:  34%|███▍      | 576/1680 eta 00:01
^C  Preparing editable metadata (pyproject.toml) ... canceled

then run the following (the "Generating targets" step should be quite fast now)

pip install --no-build-isolation --config-settings=setup-args=-Dbuild-docs=false --editable . --verbose

you'll see

  Generating targets:   0%|          | 0/575 eta ?
  Generating targets:   8%|▊         | 44/575 eta 00:01
  Generating targets:  24%|██▍       | 137/575 eta 00:00
  Generating targets:  39%|███▉      | 226/575 eta 00:00
  Generating targets:  55%|█████▌    | 318/575 eta 00:00
  Generating targets:  70%|███████   | 403/575 eta 00:00
  Generating targets:  86%|████████▌ | 494/575 eta 00:00


  Writing build.ninja:   0%|          | 0/2384 eta ?

  Traceback (most recent call last): <as above>

It can be fixed by rm -r build/cp313 then run the command again without interrupting it.

Expected behavior
No error

system parameters

• native build
• Linux
• Python 3.13.7
• meson 1.9.0
• ninja 1.13.1

[bonzini]

Please include the contents of build/cp313/meson-private/cmd_line.txt (or another file with that name under build/cp313) after the first step.

Also, on the second invocation you should see something like

WARNING: Regenerating configuration from scratch.
Reason: ...

Please include this part of the output.

[user202729]

1. After the first run:

(sage-dev) [sage]$ ls build/cp313/meson-private
cmake_bdw-gc-threaded    cmake_mkl     python-3.13-installed.json  sanitycheckcpp.exe
__CMake_compiler_info__  coredata.dat  sanitycheckc.c
cmake_libmtx             meson.lock    sanitycheckc.exe
cmake_libsirocco         pycompile.py  sanitycheckcpp.cc

(sage-dev) [sage]$ cat build/cp313/meson-private/cmd_line.txt 
cat: build/cp313/meson-private/cmd_line.txt: No such file or directory

the file doesn't exist.

2. there is no such warning on the second invocation.