When checking the impact of upgradign pip from 23.0.1 to 23.1.2 in https://src.fedoraproject.org/rpms/python-pip/pull-request/123 I realized setroubleshoot repeatedly fails with the new pip but succeeds with the old one.

The error is:

/usr/bin/python3 -m pip install `test -n "/builddir/build/BUILDROOT/setroubleshoot-3.3.32-2.fc39.x86_64" && echo --root /builddir/build/BUILDROOT/setroubleshoot-3.3.32-2.fc39.x86_64` \
`test -n "/usr" && echo --prefix /usr` .
Processing /builddir/build/BUILD/setroubleshoot-3.3.32/src
  Installing build dependencies: started
  Installing build dependencies: finished with status 'error'
  error: subprocess-exited-with-error
  
  × pip subprocess to install build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f577dc891d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f577de00a90>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f577f7fcd90>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f577de69450>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f577de68710>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× pip subprocess to install build dependencies did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.
make[5]: Leaving directory '/builddir/build/BUILD/setroubleshoot-3.3.32/src'
make[5]: *** [Makefile:1076: install-exec-hook] Error 1
make[4]: *** [Makefile:975: install-exec-am] Error 2
make[4]: Leaving directory '/builddir/build/BUILD/setroubleshoot-3.3.32/src'
make[3]: *** [Makefile:912: install-am] Error 2
make[3]: Leaving directory '/builddir/build/BUILD/setroubleshoot-3.3.32/src'
make[2]: *** [Makefile:905: install] Error 2
make[2]: Leaving directory '/builddir/build/BUILD/setroubleshoot-3.3.32/src'
make[1]: Leaving directory '/builddir/build/BUILD/setroubleshoot-3.3.32'
make[1]: *** [Makefile:755: install-recursive] Error 1
make: *** [Makefile:1060: install] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.iyHcEF (%install)


I believe pip defaults to isolated builds now and will always attempt to install build dependencies (setuptools>=40.8.0 in this case because that I the default when no build dependencies are mentioned in pyproject.toml) from the internet to a temporary virtual environment.

I think this can be fixed by adding --no-build-isolation to pip install:

$ pip install --help | grep isolation
  --no-build-isolation        Disable isolation when building a modern source

Reproducible: Always

Steps to Reproduce:
Build setroubleshoot e.g. in https://copr.fedorainfracloud.org/coprs/churchyard/pip-23.1.2
Actual Results:  
Build fails.

Expected Results:  
Build succeeds.

All logs available at https://copr.fedorainfracloud.org/coprs/churchyard/pip-23.1.2/package/setroubleshoot/