requirements: Workaround pylibssh Failed to open session

[justin-stephenson]

Install from Justin's branch with pylibssh workaround for SSH_AGAIN return code issue.

pyproject.toml change was needed or installing generates error:

(.venv) justin@fedora:~/github/sssd/src/tests/system$ pip3 install -e ~/github/pytest-mh/                                                                                                                                                  10:10:06 [181/500]
Obtaining file:///home/justin/github/pytest-mh                                                                                                                                                                           
  Installing build dependencies ... done                                                                                                                                                                                 
  Checking if build backend supports build_editable ... done                                                                                                                                                             
  Getting requirements to build editable ... done                                                                                                                                                                        
  Installing backend dependencies ... done                                                                                                                                                                               
  Preparing editable metadata (pyproject.toml) ... error                                                                                                                                                                 
  error: subprocess-exited-with-error                                                                                                                                                                                    
                                                                                                                                                                                                                         
  × Preparing editable metadata (pyproject.toml) did not run successfully.                                                                                                                                               
  │ exit code: 1                                                                                                                                                                                                         
  ╰─> [35 lines of output]                                                                                                                                                                                               
      Traceback (most recent call last):                                                                                                                                                                                 
        File "/home/justin/github/sssd/src/tests/system/.venv/lib64/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 167, in prepare_metadata_for_build_editable                    
          hook = backend.prepare_metadata_for_build_editable                                                                                                                                                             
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                                                             
      AttributeError: module 'hatchling.build' has no attribute 'prepare_metadata_for_build_editable'                                                                                                                    
                                                                                                                                                                                                                         
      During handling of the above exception, another exception occurred:                                                                                                                                                
                                                                                                                                                                                                                         
      Traceback (most recent call last):                                                                                                                                                                                 
        File "/home/justin/github/sssd/src/tests/system/.venv/lib64/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>                                               
          main()                                                                                                                                                                                                         
          ~~~~^^                                                                                                                                                                                                         
        File "/home/justin/github/sssd/src/tests/system/.venv/lib64/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])                                                               
                                   ~~~~^^^^^^^^^^^^^^^^^^^^^^^^                                                                
        File "/home/justin/github/sssd/src/tests/system/.venv/lib64/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 176, in prepare_metadata_for_build_editable
          whl_basename = build_hook(metadata_directory, config_settings)                                                       
        File "/tmp/pip-build-env-2nlf93fw/overlay/lib/python3.13/site-packages/hatchling/build.py", line 83, in build_editable 
          return os.path.basename(next(builder.build(directory=wheel_directory, versions=['editable'])))                      
                                  ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                       
        File "/tmp/pip-build-env-2nlf93fw/overlay/lib/python3.13/site-packages/hatchling/builders/plugin/interface.py", line 90, in build
          self.metadata.validate_fields()                      
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^                      
        File "/tmp/pip-build-env-2nlf93fw/overlay/lib/python3.13/site-packages/hatchling/metadata/core.py", line 266, in validate_fields
          self.core.validate_fields()                          
          ~~~~~~~~~~~~~~~~~~~~~~~~~^^                          
        File "/tmp/pip-build-env-2nlf93fw/overlay/lib/python3.13/site-packages/hatchling/metadata/core.py", line 1366, in validate_fields
          getattr(self, attribute)                             
          ~~~~~~~^^^^^^^^^^^^^^^^^                             
        File "/tmp/pip-build-env-2nlf93fw/overlay/lib/python3.13/site-packages/hatchling/metadata/core.py", line 1220, in dependencies
          self._dependencies = list(self.dependencies_complex)                                                                
                                    ^^^^^^^^^^^^^^^^^^^^^^^^^                                                                 
        File "/tmp/pip-build-env-2nlf93fw/overlay/lib/python3.13/site-packages/hatchling/metadata/core.py", line 1205, in dependencies_complex
          raise ValueError(message)                            
      ValueError: Dependency #1 of field `project.dependencies` cannot be a direct reference unless field `tool.hatch.metadata.allow-direct-references` is set to `true`
      [end of output]                                          
                                                               
  note: This error originates from a subprocess, and is likely not a problem with pip.    

[pbrezina]

This is to workaround ansible/pylibssh#756

[pbrezina]

It might be better to add this to the SSSD repo. I don't really know how this kind of dependency would or would not work in pypi package.

[webknjaz]

I don't really know how this kind of dependency would or would not work in pypi package.

As far as core packaging metadata is concerned, it's kinda valid. But one problem is that a branch reference is a floating pointer. A commit hash would be better. Also, I'd stick with abstract deps in core packaging metadata and use pip constraints to temporarily restrict the concrete candidates.