[gentoo-user] Sandbox violations when installing a Python package

[Helmut Jarausch]

Hi,

I hope somebody can help me.

I've written a new ebuild for  "dev-python/imapclient-1.1.0" (the  
latest version in the tree is version 0.13)
I've just copied dev-python/imapclient-0.13.ebuild and remove a patch  
which is no longer needed.

Ebuilding this packages dies of a Sandbox Violation:

>>> Compiling source in
>>> /var/tmp/portage/dev-python/imapclient-1.1.0/work/IMAPClient-1.1.0
>>> ...
  * python3_6: running distutils-r1_run_phase  
distutils-r1_python_compile

>>> snip <<<

   File "/usr/lib64/python3.6/site-packages/setuptools/sandbox.py",  
line 411, in _violation
     raise SandboxViolation(operation, args, kw)
setuptools.sandbox.SandboxViolation: SandboxViolation:  
mkdir('/var/tmp/portage/dev-python/imapclient-1.1.0/work/IMAPClient-1.1.0-python3_6/lib/sphinx',  
511) {}


I have used  "FEATURES=-sandbox" and I've added  addpredict and addread  
in

python_prepare_all() {
	addpredict "/var/tmp/portage/dev-python/${P}/work"
	addread "/var/tmp/portage/dev-python/${P}/work"
	distutils-r1_python_prepare_all
}

but it still raises a Sandbox Violation.

What can I do about this?
How can I debug this.
How to stop 'setuptools' to check for a Sandbox Violation,
particularly as /var/tmp/portage/dev-python/imapclient-1.1.0/work/...
isn't critical.

Many thanks for any hints,
Helmut