Windows script launchers missing backslashes in shebang

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Originally reported by: ionelmc (Bitbucket: ionelmc, GitHub: ionelmc)

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Using Setuptools 12.0, slashes are missing in the shebang for the installed script:

C:\Users\ionel_000\Projects\sandbox>pip uninstall setuptools
Cannot uninstall requirement setuptools, not installed

C:\Users\ionel_000\Projects\sandbox>pip install setuptools==12.0
Collecting setuptools==12.0
  Using cached setuptools-12.0-py2.py3-none-any.whl
Installing collected packages: setuptools

Successfully installed setuptools-12.0

C:\Users\ionel_000\Projects\sandbox>pip install --no-use-wheel nameless
Collecting nameless
  Downloading nameless-0.1.2.tar.gz
    warning: no directories found matching 'examples'
Installing collected packages: nameless
  Running setup.py install for nameless
    warning: no directories found matching 'examples'
    Installing nameless-script.py script to c:\Python27\Scripts
    Installing nameless.exe script to c:\Python27\Scripts
Successfully installed nameless-0.1.2

C:\Users\ionel_000\Projects\sandbox>type c:\Python27\Scripts\nameless-script.py
#!c:Python27python.exe
# EASY-INSTALL-ENTRY-SCRIPT: 'nameless==0.1.2','console_scripts','nameless'
__requires__ = 'nameless==0.1.2'
import sys
from pkg_resources import load_entry_point

if __name__ == '__main__':
    sys.exit(
        load_entry_point('nameless==0.1.2', 'console_scripts', 'nameless')()
    )

Rolling back to setuptools 11.3.1 demonstrates the behavior previously worked:

C:\Users\ionel_000\Projects\sandbox>pip install setuptools==13.3.1
Collecting setuptools==13.3.1
  Could not find a version that satisfies the requirement setuptools==13.3.1 (from versions: 0.6b1, 0.6b2, 0.6b3, 0.6b4, 0.6rc1, 0.6rc2, 0.6rc3, 0.6rc4, 0.6rc5, 0.6rc6, 0.6rc7, 0.6rc8, 0.6rc9, 0.6rc10, 0.6rc11, 0.7.2, 0.
7.3, 0.7.4, 0.7.5, 0.7.6, 0.7.7, 0.7.8, 0.8, 0.9, 0.9.1, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 0.9.6, 0.9.7, 0.9.8, 1.0, 1.1, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.1.5, 1.1.6, 1.1.7, 1.2, 1.3, 1.3.1, 1.3.2, 1.4, 1.4.1, 1.4.2, 2.0, 2.0.1,
2.0.2, 2.1, 2.1.1, 2.1.2, 2.2, 3.0, 3.0.1, 3.0.2, 3.1, 3.2, 3.3, 3.4, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.5, 3.5.1, 3.5.2, 3.6, 3.7, 3.7.1, 3.8, 3.8.1, 4.0, 4.0.1, 5.0, 5.0.1, 5.0.2, 5.1, 5.2, 5.3, 5.4, 5.4.1, 5.4.2, 5.5, 5.5.
1, 5.6, 5.7, 5.8, 6.0.1, 6.0.2, 6.1, 7.0, 8.0, 8.0.1, 8.0.2, 8.0.3, 8.0.4, 8.1, 8.2, 8.2.1, 8.3, 9.0, 9.0.1, 9.1, 10.0, 10.0.1, 10.1, 10.2, 10.2.1, 11.0, 11.1, 11.2, 11.3, 11.3.1, 12.0, 12.0.1)
  No distributions matching the version for setuptools==13.3.1

C:\Users\ionel_000\Projects\sandbox>pip install setuptools==11.3.1
Collecting setuptools==11.3.1
  Downloading setuptools-11.3.1-py2.py3-none-any.whl (500kB)
    100% |################################| 503kB 5.1MB/s eta 0:00:01
Installing collected packages: setuptools
  Found existing installation: setuptools 12.0
    Uninstalling setuptools-12.0:
      Successfully uninstalled setuptools-12.0

Successfully installed setuptools-11.3.1

C:\Users\ionel_000\Projects\sandbox>pip install --no-use-wheel -I nameless
Collecting nameless
  Using cached nameless-0.1.2.tar.gz
    warning: no directories found matching 'examples'
Installing collected packages: nameless
  Running setup.py install for nameless
    warning: no directories found matching 'examples'
    Installing nameless-script.py script to c:\Python27\Scripts
    Installing nameless.exe script to c:\Python27\Scripts
Successfully installed nameless-0.1.2

C:\Users\ionel_000\Projects\sandbox>type c:\Python27\Scripts\nameless-script.py
#!c:\Python27\python.exe
# EASY-INSTALL-ENTRY-SCRIPT: 'nameless==0.1.2','console_scripts','nameless'
__requires__ = 'nameless==0.1.2'
import sys
from pkg_resources import load_entry_point

if __name__ == '__main__':
    sys.exit(
        load_entry_point('nameless==0.1.2', 'console_scripts', 'nameless')()
    )

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/331

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Original comment by ionelmc (Bitbucket: ionelmc, GitHub: ionelmc):

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Also, no virtualenvs were involved.

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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I don't get that error when using only setuptools/easy_install:

> $env:SETUPTOOLS_LAUNCHER='executable'
> easy_install nameless
Searching for nameless
Best match: nameless 0.1.2
Processing nameless-0.1.2-py3.4.egg
nameless 0.1.2 is already the active version in easy-install.pth
Installing nameless-script.py script to c:\python\Scripts
Installing nameless.exe script to c:\python\Scripts

Using c:\python\lib\site-packages\nameless-0.1.2-py3.4.egg
Processing dependencies for nameless
Finished processing dependencies for nameless
> head C:\python\Scripts\nameless-script.py -n 1
#!c:\python\python.EXE

So I suspect that pip is involved, possibly passing a --executable to easy_install.

[ghost]

Original comment by ionelmc (Bitbucket: ionelmc, GitHub: ionelmc):

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Can you reproduce it with pip?

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Indeed. Using pip replicates your finding in the same environment.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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The issue appears to be with the install_scripts command.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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The issue appears to be that the use of shlex.split() uses a posix mode by default.

>>> import setuptools.command.easy_install as ei
>>> ei.CommandSpec.from_param(sys.executable).as_header()
'#!c:pythonpython.exe\n`

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Adding test capturing failure where sys.executable loses backslashes on Windows. Ref #331.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Use non-posix semantics in a WindowsCommandSpec and use that class in the Windows script writers. Fixes #331.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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I really despise this fix. There's just so much complexity out there and not a good abstraction for handling it. In any case, I think this fix should work while keeping the support for #188.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Fixed in 12.0.3.