change the python command used by the mobilesdk / titanium studio

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I'm having some trouble configuring the Android SDK on Arch Linux (64-bit).

I'm using Titanium Studio

The problem is simple. In my box /usr/bin/python points to Python 3.2.1, and Titanium Studio needs Python 2.x.

!MESSAGE   File "/home/user/.titanium/mobilesdk/linux/1.7.2/android/", line 41
    print "Usage: %s <directory>" % os.path.basename(sys.argv[0])
Is it possible to configure the python command used by Titanium Studio? Some env variable or flag in TitaniumStudio.ini?

I've already tried a couple of things:

  • Environment variables:
    • PYTHON
  • ln -s /usr/bin/python2 python in my user's bin/ directory, so that the python command for that user is Python 2.7.2.
  • Replacing every occurrence of #!/usr/bin/env python with #!/usr/bin/env python2 in .titanium/mobilesdk.

The only workaround I've found so far is doing this:

sudo rm /usr/bin/python
sudo ln -s /usr/bin/python2 /usr/bin/python
But that has the slight disadvantage of breaking all other python packages / scripts in my system.

Any ideas would be appreciated, thanks.

— asked 4 years ago by Eduardo Lopez
1 Comment
  • I guess I could give py2to3 a try, but I'm hoping there's a quicker alternative.

    — commented 4 years ago by Eduardo Lopez

2 Answers

We solved this problem with per process namespaces. We basically changed the /usr/bin/python link (to point to python2) in the process running titanium rather than changing it for the whole system.

#define _GNU_SOURCE
#include <sched.h>
#include <syscall.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
    syscall(SYS_unshare, CLONE_NEWNS);
    if (argc > 1)
        return execvp(argv[1], &argv[1]);
    return execv("/bin/sh", NULL);
And we run this in a little bash script that creates the process and sets up the filesystem, something like:
sudo ./newns sh -c "mount -n --bind /usr/bin/python2 /usr/bin/python; su username"
Hope this helps someone.

Hi there Eduardo Lopez,

I'm pretty new to Arch Linux and a i'm a n00b with python & custom environment (to python2.7).

Could you please explained your solution with more detail ?

Configuring Titanium Studio correctly would make arch uber cool ::):)

Thank you very much!

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