Issue2707

jython.py appears broken on Linux by the shebang line:

#!/usr/bin/env python2.7 -E

This doesn't work because a shebang is not processed like a shell command (see https://unix.stackexchange.com/questions/63979/shebang-line-with-usr-bin-env-command-argument-fails-on-linux). env receives everything after the space as one argument and you get the message that it cannot find the file "python2.7 -E".

An option -S (--split-string) is documented that addresses the problem, but it doesn't work on my Linux system. I could maybe install a later env, but then it will fail for anyone who hasn't done that with "invalid option -- 'S'".

This mostly does not show in a development environment because dist/bin/jython means the shell script version, but it fails in tests that explicitly ask for jython.py (test_jython_launcher).

Assuming env is there for a good reason, and it has to work across Unix-like OSes, I don't see any better course of action than to remove the -E.
https://hg.python.org/jython/rev/38824a8816a8

Insulation from the environment is desirable(why not -S or -s too?) but until there's a "system python" we can't get it like this.

We don't see this failure on the CI because the test_jython_launcher does not run. (Not sure why.)

You can get the "-E" option if you don't mind calling an intermediate script to do so. The attached python_noenv.sh should do the job (more or less).

It crossed my mind to add further layer of wrapping, but I thought I'd wait to see if there was an actual problem.