Faking a Linux environment without chroot
- by Pascal
For a university project I want to test a C++11 program on a 32-core machine. Unfortunately the machine has Ubuntu 12.04 with GCC 4.6 installed (we need GCC 4.7 because of some C++11 threading features).
In such an environment I would normally run a chroot with a custom linux (say a debootstrap with Ubuntu 12.10). Since we don't get root access on the machine we can't use chroot.
So far I have prepared a run-time environment using debootstrap for our code, I compiled it in the debootstrap environemnt. Then copied it onto the server (using rsync).
In order to run our C++ code I set the LD_LIBRARY_PATH to
export LD_LIBRARY_PATH=~/debootstrap/usr/lib/:~/debootstrap/lib64/:~/debootstrap/usr/lib/x86_64-linux-gnu/:~/debootstrap/lib/x86_64-linux-gnu/:$LD_LIBRARY_PATH
and so far our code seems to run. I'm however stuck with our python code. It doesn't seem to be sufficient to set the paths manually.
export PYTHONPATH=~/debootstrap/usr/lib/python2.7/dist-packages:~/debootstrap/usr/lib/python2.7:~/debootstrap/usr/lib/python2.7/plat-linux2:~/debootstrap/usr/lib/python2.7/lib-tk:~/debootstrap/usr/lib/python2.7/lib-dynload:~/debootstrap/usr/local/lib/python2.7/dist-packages:~/debootstrap/usr/lib/pymodules/python2.7:~/debootstrap/usr/lib/python2.7/dist-packages/PIL:~/debootstrap/usr/lib/python2.7/dist-packages/gtk-2.0:~/debootstrap/usr/lib/python2.7
Executing our script results in
ImportError: No module named _path
Is there an easier way to accomplish a "fake"-chroot than just overriding and creating environment variables?
Note I need python since we created a custom C++-Python module in order to run our tests. Maybe I should create two questions from this.
