'scripts' lose executable priveleges from pip install

Environment

• pip version: 20.0.2
• Python version: 2.7.5
• OS: RHEL 7.7/SELinux
• setuptools version: 44.0.0

Description

pip-installing a package that contains a setup.py that specifies the scripts argument causes the resulting file to lost its executable permission(s).

Reproducible example located at:

https://github.com/bsolomon1124/pip-scripts-hostbits-mvce

Expected behavior

The source repository bin/my_script is executable (via chmox a+rx bin/my_script). It loses this permission when installed by pip. It should maintain its executable permission for all users.

How to Reproduce

$ pip install git+ssh://[e-mail]/bsolomon1124/pip-scripts-hostbits-mvce.git
$ ls -la /usr/bin/my_script  # or ls -la /usr/local/bin/my_script

Output

$ ls -la /usr/bin/my_script
-rw-r--r--. 1 root root 39 Jan 28 19:10 /usr/bin/my_script

Alternate example

$ yum install gcc python-devel
$ pip install uwsgi
$ ls -la /usr/bin/uwsgi
-rw-r--r--. 1 root root 1369984 Jan 28 18:53 /usr/bin/uwsgi
$ echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

[chrahunt]

Is /tmp mounted noexec? It may be related to #6364.

[bsolomon1124]

Related helpful discussion for others with this issue: https://github.com/pypa/pip/issues/4462.

In this case,

mkdir pip-tmp
TMPDIR='./pip-tmp' pip install package_name && rmdir pip-tmp

works like a charm.