create rpm package requires sudo permission

[dragon512]

Expected Behavior

The command of invirtualenv --deploy_conf deploy.conf create_package rpm
should just work without elevation

Current Behavior

However, it fails with

error: failed to create directory %{_specdir}: /rpmbuild/SPECS: Permission denied
...
  File "/home/jkenny/.pyenv/versions/3.8.2/lib/python3.8/subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/usr/bin/rpmbuild', '-ba', 'package.spec']' returned non-zero exit status 1.

Possible Solution

One solution to work around this is to make a /rpmbuild directory and set permission to allow this to work. However this requires sudo right which one may not have and is an undocumented step to have this tool work.

Ideally, an option can be passed to rpmbuild to build in the current directory ie
rpmbuild --define "_topdir <somedir>" ...

The docs should be updated to explain the been to create a directory, or the tool should not build in an area that requires elevated permission.