Package: virtualenvwrapper Version: 4.3.1-2 Severity: important Dear Maintainer,
after upgrading system-wide Python installation (in my case from 3.5.3 to 3.5.4), virtualenvs may break due to the outdated interpreter (somevirtualenv/bin/python3) inside the venv, trying to work with a newer stdlib. The problem is that mkvirtualenv copies rather than symlinks the python interpreter binary, but symlinks the modules from standard library (e.g. /usr/lib/python3.5). Whenever python3.5 is updated in the system (e.g. via apt), the virtualenv is pointed at newer library (i.e. 3.5.4), but still uses the old interpreter (3.5.3), breaking compatibility. Reproduction: 1. install python3.5 = 3.5.3 2. make some virtualenv using /usr/bin/python3.5 ($ mkvirtualenv -p /usr/bin/python3.5 somevirtualenv) 3. upgrade python3.5 to 3.5.4 4. enter the virtualenv ($ workon somevirtualenv) 5. open python3 ($ python3) 6. try importing an incompatible module (>>> import ctypes) Import threw exception: ImportError: /home/elegant/virtualenvs/rpi2casterd/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so: undefined symbol: _PyUnicode_AsWideCharString Breaks anything that depends on it as well, making the virtualenv unusable until it's fixed. Workaround: 1. $ cd $WORKON_HOME/somevirtualenv/bin 2. $ mv python3 python3_old (put the old interpreter out of the way) 3. $ ln -s /usr/bin/python3.5 python3 (symlink the newer python3.5 from system) 4. $ workon somevirtualenv 5. $ python3 >>> import ctypes (everything OK) -- System Information: Debian Release: buster/sid APT prefers testing APT policy: (900, 'testing'), (600, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386, armhf Kernel: Linux 4.13.0-1-amd64 (SMP w/2 CPU cores) Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8), LANGUAGE=pl_PL.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages virtualenvwrapper depends on: ii libjs-sphinxdoc 1.6.5-2 ii python 2.7.14-3 ii python-stevedore 1.25.0-2 ii python-virtualenv 15.1.0+ds-1 ii virtualenv 15.1.0+ds-1 ii virtualenv-clone 0.2.5-1 Versions of packages virtualenvwrapper recommends: ii bash-completion 1:2.1-4.3 virtualenvwrapper suggests no packages. -- no debconf information
