Virtualenv: lib64 directory is no longer symlinked to lib?

Issue

Came across this issue while debugging tox environment creation issues. It would seem that when using virtualenv==16.7.10 or simply python -m venv, the lib64 directory was a symlink to the lib directory as expected. However, in virtualenv==20.0.14, this is no longer the case. Here, lib64 is created as a directory.

For example, the following will reproduce the issue.

docker run --rm -i fedora:31 <<EOF
set -x
dnf --quiet install -y pip
for v in 16.7.10 20.0.14; do
  pip install virtualenv==\$v >/dev/null 2>&1
  virtualenv venv-\$v
  ls -all venv-\$v
done
EOF

The following, is a snippet from the output.

+ pip install virtualenv==16.7.10
+ virtualenv venv-16.7.10
Using base prefix '/usr'
New python executable in /venv-16.7.10/bin/python3
Also creating executable in /venv-16.7.10/bin/python
Installing setuptools, pip, wheel...
done.
+ ls -all venv-16.7.10
total 28
drwxr-xr-x. 5 root root 4096 Mar 26 03:35 .
drwxr-xr-x. 1 root root 4096 Mar 26 03:35 ..
drwxr-xr-x. 2 root root 4096 Mar 26 03:36 bin
drwxr-xr-x. 2 root root 4096 Mar 26 03:35 include
drwxr-xr-x. 3 root root 4096 Mar 26 03:35 lib
lrwxrwxrwx. 1 root root    3 Mar 26 03:35 lib64 -> lib
...
+ pip install virtualenv==20.0.14
+ virtualenv venv-20.0.14
created virtual environment CPython3.7.6.final.0-64 in 249ms
  creator CPython3Posix(dest=/venv-20.0.14, clear=False, global=False)
  seeder FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/root/.local/share/virtualenv/seed-app-data/v1.0.1)
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator
+ ls -all venv-20.0.14
total 32
drwxr-xr-x. 5 root root 4096 Mar 26 03:36 .
drwxr-xr-x. 1 root root 4096 Mar 26 03:36 ..
drwxr-xr-x. 2 root root 4096 Mar 26 03:36 bin
drwxr-xr-x. 3 root root 4096 Mar 26 03:36 lib
drwxr-xr-x. 3 root root 4096 Mar 26 03:36 lib64
-rw-r--r--. 1 root root  202 Mar 26 03:36 pyvenv.cfg

Environment

Provide at least:

• OS: Fedora release 31 (Thirty One), Linux 7ab2b964bf3a 5.5.10-200.fc31.x86_64 #1 SMP Wed Mar 18 14:21:38 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
• pip list of the host python where virtualenv is installed:

```console
Package Version

appdirs 1.4.3
distlib 0.3.0
filelock 3.0.12
gpg 1.13.1
importlib-metadata 1.5.2
libcomps 0.1.14
pip 19.1.1
rpm 4.15.1
setuptools 41.6.0
six 1.14.0
virtualenv 20.0.14
zipp 3.1.0
```

Output of the virtual environment creation

Make sure to run the creation with -vvv --with-traceback:

75 setup logging to NOTSET [DEBUG report:43]
75 created app data folder /root/.local/share/virtualenv [DEBUG app_data:52]
84 find interpreter for spec PythonSpec(path=/usr/bin/python3) [INFO builtin:44]
84 proposed PythonInfo(spec=CPython3.7.6.final.0-64, exe=/usr/bin/python3, platform=linux, version='3.7.6 (default, Jan 30 2020, 09:44:41) \n[GCC 9.2.1 20190827 (Red Hat 9.2.1-1)]', encoding_fs_io=utf-8-UTF-8) [INFO builtin:50]
84 accepted PythonInfo(spec=CPython3.7.6.final.0-64, exe=/usr/bin/python3, platform=linux, version='3.7.6 (default, Jan 30 2020, 09:44:41) \n[GCC 9.2.1 20190827 (Red Hat 9.2.1-1)]', encoding_fs_io=utf-8-UTF-8) [DEBUG builtin:52]
91 filesystem is case-sensitive [DEBUG info:28]
160 create virtual environment via CPython3Posix(dest=/venv-20.0.14, clear=False, global=False) [INFO session:52]
160 create folder /venv-20.0.14/bin [DEBUG _sync:21]
160 create folder /venv-20.0.14/lib/python3.7/site-packages [DEBUG _sync:21]
160 create folder /venv-20.0.14/lib64/python3.7/site-packages [DEBUG _sync:21]
161 write /venv-20.0.14/pyvenv.cfg [DEBUG pyenv_cfg:34]
161     home = /usr [DEBUG pyenv_cfg:38]
161     implementation = CPython [DEBUG pyenv_cfg:38]
161     version_info = 3.7.6.final.0 [DEBUG pyenv_cfg:38]
161     virtualenv = 20.0.14 [DEBUG pyenv_cfg:38]
161     include-system-site-packages = false [DEBUG pyenv_cfg:38]
161     base-prefix = /usr [DEBUG pyenv_cfg:38]
161     base-exec-prefix = /usr [DEBUG pyenv_cfg:38]
161     base-executable = /usr/bin/python3 [DEBUG pyenv_cfg:38]
161 symlink /usr/bin/python3 to /venv-20.0.14/bin/python [DEBUG _sync:40]
162 create virtualenv import hook file /venv-20.0.14/lib/python3.7/site-packages/_virtualenv.pth [DEBUG api:76]
163 create /venv-20.0.14/lib/python3.7/site-packages/_virtualenv.py [DEBUG api:79]
163 ============================== target debug ============================== [DEBUG session:54]
163 debug via /venv-20.0.14/bin/python /usr/local/lib/python3.7/site-packages/virtualenv/create/debug.py [DEBUG creator:187]
163 {
  "sys": {
    "executable": "/venv-20.0.14/bin/python",
    "_base_executable": null,
    "prefix": "/venv-20.0.14",
    "base_prefix": "/usr",
    "real_prefix": null,
    "exec_prefix": "/venv-20.0.14",
    "base_exec_prefix": "/usr",
    "path": [
      "/usr/lib64/python37.zip",
      "/usr/lib64/python3.7",
      "/usr/lib64/python3.7/lib-dynload",
      "/venv-20.0.14/lib64/python3.7/site-packages",
      "/venv-20.0.14/lib/python3.7/site-packages"
    ],
    "meta_path": [
      "<class '_virtualenv._Finder'>",
      "<class '_frozen_importlib.BuiltinImporter'>",
      "<class '_frozen_importlib.FrozenImporter'>",
      "<class '_frozen_importlib_external.PathFinder'>"
    ],
    "fs_encoding": "utf-8",
    "io_encoding": "UTF-8"
  },
  "version": "3.7.6 (default, Jan 30 2020, 09:44:41) \n[GCC 9.2.1 20190827 (Red Hat 9.2.1-1)]",
  "os": "<module 'os' from '/usr/lib64/python3.7/os.py'>",
  "site": "<module 'site' from '/usr/lib64/python3.7/site.py'>",
  "datetime": "<module 'datetime' from '/usr/lib64/python3.7/datetime.py'>",
  "math": "<module 'math' from '/usr/lib64/python3.7/lib-dynload/math.cpython-37m-x86_64-linux-gnu.so'>",
  "json": "<module 'json' from '/usr/lib64/python3.7/json/__init__.py'>"
} [DEBUG session:55]
201 add seed packages via FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/root/.local/share/virtualenv/seed-app-data/v1.0.1) [INFO session:59]
202 Attempting to acquire lock 140367118139024 on /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/wheels.lock [DEBUG filelock:270]
202 Lock 140367118139024 acquired on /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/wheels.lock [INFO filelock:274]
203 get bundled wheel /usr/local/lib/python3.7/site-packages/virtualenv/seed/embed/wheels/pip-20.0.2-py2.py3-none-any.whl [DEBUG acquire:51]
204 get bundled wheel /usr/local/lib/python3.7/site-packages/virtualenv/seed/embed/wheels/setuptools-46.1.1-py3-none-any.whl [DEBUG acquire:51]
204 get bundled wheel /usr/local/lib/python3.7/site-packages/virtualenv/seed/embed/wheels/wheel-0.34.2-py2.py3-none-any.whl [DEBUG acquire:51]
209 install wheel from wheel /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/wheels/wheel-0.34.2-py2.py3-none-any.whl via CopyPipInstall [DEBUG via_app_data:46]
210 install setuptools from wheel /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/wheels/setuptools-46.1.1-py3-none-any.whl via CopyPipInstall [DEBUG via_app_data:46]
210 build install image to /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/wheel-0.34.2-py2.py3-none-any of wheel-0.34.2-py2.py3-none-any.whl [DEBUG base:57]
210 install pip from wheel /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/wheels/pip-20.0.2-py2.py3-none-any.whl via CopyPipInstall [DEBUG via_app_data:46]
210 build install image to /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/setuptools-46.1.1-py3-none-any of setuptools-46.1.1-py3-none-any.whl [DEBUG base:57]
211 build install image to /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/pip-20.0.2-py2.py3-none-any of pip-20.0.2-py2.py3-none-any.whl [DEBUG base:57]
236 changing mode of /tmp/tmppzoh5m0f/wheel-3.7 to 755 [INFO util:566]
237 changing mode of /tmp/tmppzoh5m0f/wheel to 755 [INFO util:566]
238 changing mode of /tmp/tmppzoh5m0f/wheel3 to 755 [INFO util:566]
243 copy directory /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/wheel-0.34.2-py2.py3-none-any/wheel to /venv-20.0.14/lib/python3.7/site-packages/wheel [DEBUG _sync:48]
256 copy directory /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/wheel-0.34.2-py2.py3-none-any/wheel-0.34.2.dist-info to /venv-20.0.14/lib/python3.7/site-packages/wheel-0.34.2.dist-info [DEBUG _sync:48]
262 copy /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/wheel-0.34.2-py2.py3-none-any/wheel-0.34.2.virtualenv to /venv-20.0.14/lib/python3.7/site-packages/wheel-0.34.2.virtualenv [DEBUG _sync:48]
263 changing mode of /venv-20.0.14/bin/wheel-3.7 to 755 [INFO util:566]
264 changing mode of /venv-20.0.14/bin/wheel to 755 [INFO util:566]
264 changing mode of /venv-20.0.14/bin/wheel3 to 755 [INFO util:566]
265 generated console scripts wheel-3.7 wheel wheel3 [DEBUG base:53]
296 changing mode of /tmp/tmp1h0cn9gf/easy_install to 755 [INFO util:566]
297 changing mode of /tmp/tmp1h0cn9gf/easy_install3 to 755 [INFO util:566]
297 changing mode of /tmp/tmp1h0cn9gf/easy_install-3.7 to 755 [INFO util:566]
306 copy /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/setuptools-46.1.1-py3-none-any/setuptools-46.1.1.virtualenv to /venv-20.0.14/lib/python3.7/site-packages/setuptools-46.1.1.virtualenv [DEBUG _sync:48]
307 copy directory /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/setuptools-46.1.1-py3-none-any/pkg_resources to /venv-20.0.14/lib/python3.7/site-packages/pkg_resources [DEBUG _sync:48]
313 copy /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/setuptools-46.1.1-py3-none-any/easy_install.py to /venv-20.0.14/lib/python3.7/site-packages/easy_install.py [DEBUG _sync:48]
313 copy directory /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/setuptools-46.1.1-py3-none-any/setuptools-46.1.1.dist-info to /venv-20.0.14/lib/python3.7/site-packages/setuptools-46.1.1.dist-info [DEBUG _sync:48]
317 copy directory /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/setuptools-46.1.1-py3-none-any/setuptools to /venv-20.0.14/lib/python3.7/site-packages/setuptools [DEBUG _sync:48]
344 changing mode of /venv-20.0.14/bin/easy_install to 755 [INFO util:566]
345 changing mode of /venv-20.0.14/bin/easy_install3 to 755 [INFO util:566]
345 changing mode of /venv-20.0.14/bin/easy_install-3.7 to 755 [INFO util:566]
345 generated console scripts easy_install easy_install-3.7 easy_install3 [DEBUG base:53]
383 changing mode of /tmp/tmp483fsq8a/pip-3.7 to 755 [INFO util:566]
383 changing mode of /tmp/tmp483fsq8a/pip3.7 to 755 [INFO util:566]
384 changing mode of /tmp/tmp483fsq8a/pip to 755 [INFO util:566]
384 changing mode of /tmp/tmp483fsq8a/pip3 to 755 [INFO util:566]
407 copy /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/pip-20.0.2-py2.py3-none-any/pip-20.0.2.virtualenv to /venv-20.0.14/lib/python3.7/site-packages/pip-20.0.2.virtualenv [DEBUG _sync:48]
408 copy directory /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/pip-20.0.2-py2.py3-none-any/pip to /venv-20.0.14/lib/python3.7/site-packages/pip [DEBUG _sync:48]
460 copy directory /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/image/CopyPipInstall/pip-20.0.2-py2.py3-none-any/pip-20.0.2.dist-info to /venv-20.0.14/lib/python3.7/site-packages/pip-20.0.2.dist-info [DEBUG _sync:48]
461 changing mode of /venv-20.0.14/bin/pip-3.7 to 755 [INFO util:566]
461 changing mode of /venv-20.0.14/bin/pip3.7 to 755 [INFO util:566]
461 changing mode of /venv-20.0.14/bin/pip to 755 [INFO util:566]
462 changing mode of /venv-20.0.14/bin/pip3 to 755 [INFO util:566]
462 generated console scripts pip-3.7 pip3.7 pip3 pip [DEBUG base:53]
462 Attempting to release lock 140367118139024 on /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/wheels.lock [DEBUG filelock:315]
462 Lock 140367118139024 released on /root/.local/share/virtualenv/seed-app-data/v1.0.1/3.7/wheels.lock [INFO filelock:318]
462 add activators for Bash, CShell, Fish, PowerShell, Python, Xonsh [INFO session:65]
464 write /venv-20.0.14/pyvenv.cfg [DEBUG pyenv_cfg:34]
465     home = /usr [DEBUG pyenv_cfg:38]
465     implementation = CPython [DEBUG pyenv_cfg:38]
465     version_info = 3.7.6.final.0 [DEBUG pyenv_cfg:38]
465     virtualenv = 20.0.14 [DEBUG pyenv_cfg:38]
465     include-system-site-packages = false [DEBUG pyenv_cfg:38]
465     base-prefix = /usr [DEBUG pyenv_cfg:38]
465     base-exec-prefix = /usr [DEBUG pyenv_cfg:38]
465     base-executable = /usr/bin/python3 [DEBUG pyenv_cfg:38]
465 created virtual environment CPython3.7.6.final.0-64 in 392ms
  creator CPython3Posix(dest=/venv-20.0.14, clear=False, global=False)
  seeder FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/root/.local/share/virtualenv/seed-app-data/v1.0.1)
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator [WARNING __main__:21]