When a script is installed on Unix, it should be named
something like "mailman-discard", with no extension.
When it is installed on Windows, it should be named
"mailman-discard.py", so that it is associated with
Python. I think that "scripts" should be smart enough
to handle this.

My suggestion is that "scripts" should be set to a list
of the scripts, including the extension, and that
distutils will remove the extension when it installs
programs on platforms where this is true:

os.name == 'posix'

It is possible to override the install_scripts class to
get this behaviour, but if you want to make a binary
distribution you also have to override bdist_wininst,
et c, since the install_scripts class is used on the
host system while building a directory tree that will
later be installed on the target system. See this
example script:

http://cvs.lysator.liu.se/viewcvs/viewcvs.cgi/mailman-discard/setup.py?rev=1.2&cvsroot=mailman-discard&content-type=text/vnd.viewcvs-markup

Peter Åstrand also suggests that on Windows, you should
create a command file named "mailman-discard.cmd" and
put it in the same directory as the
"mailman-discard.py" file. It should contain a single
line:

start %~dp0\mailman-discard.py

That way, you will be able to start the script from a
dos shell, and not just by double-clicking it in a file
browser. It would be nice if Distutils created this
file automatically when installing on the win32 platform.

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Having a ".cmd" file isn't a good idea. For a start, it isn't
Windows 9x compatible (and %~dp0 isn't available in
command.com). Also, you need to include a way of passing
any command line arguments on to the script. And
finally, "start" probably isn't right. This will run the command
in a new console window, rather than in the existing console.

A XXX.cmd file which just does @%~dp0\XXX.py %* is
better, but I still don't think it's needed. Just adding ".py" to
PATHEXT (which is something the user can do if they want,
at the same time they add the Python scripts directory to
their PATH) is enough, at least on NT/2000/XP.

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You have convinced me that the ".cmd" file was a bad idea,
so let's forget I ever mentioned it.

I still think that the extension should be removed on POSIX
platforms, however. However, if you have "foo.py" and
"foo.sh" they would both end up as "foo"; this should
produce a diagnostic.

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The obvious issue is that we can't change the semantics for
packages already out there. Existing package maintainers
will not want this change made for them automatically, and
it is not clear that this is the desirable default behaviour
anyway. Therefore, this isn't going to be considered a 'bug'.

I think what you are asking for is a new feature - a way to
give distutils the behaviour you desire, but leaving the
default semantics alone. I suggest you close this bug as
"wont fix", and add a new feature request. After that, try
and get some support for your idea from someone willing or
able to submit a patch.

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Note this was an active topic on distutils-sig last week.
Assigned to Fred in hopes that he can summarize current
thinking as a comment here.

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Thanks Tim - I found the thread - interesting, and funnily
enough covers the same issues! I also note
www.python.org/sf/976869 which is where Fred has made a patch.

My summary: nothing should be done implicitly. Whatever is
done must be explicitly specified by the packager. However,
no one is sure exactly how to spell it yet.

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Yup, I agree, Mark. Fred too. This has hit heated
temperatures at times in the Zope world, where Windows
users need .py extensions for sane script life under cmd.exe,
but somewhat over half of Unixish geeks go on like they're
being raped if an informative extension assults their prissy
eyeballs <wink>.

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Here's an idea about how to spell this:

http://mail.python.org/pipermail/distutils-sig/2004-July/004073.html

Removing the assignment to me, since I'm not going to resolve the
fundamental disagreements about what "the right thing" is. Someone else
can argue with the wrong-headed.

Has a decision been made on this? What's the current behavior on Windows?

What do you think about the way setuptools handles it ?

I'd be in favor of integrating setuptools wrapping mechanism in distutils.

(not the entry point part, just the way it generates .exe under windows
and executable script under Linux)

see
http://peak.telecommunity.com/DevCenter/setuptools#automatic-script-creation

In principle I don't have a problem with the automatic generation of an
EXE (I assume it generates a shell script with no extension on Unix?)
but it should be done in such a way that the EXE is version-independent.
This is necessary to ensure that pure-python packages, when made into
bdist_wininst installers, continue to be version-independent. (At the
moment, distutils generates version-dependent bdist_wininst packages
*only* for C extensions. Setuptools generates version-dependent
installers all the time, which is a pain).

This may mean that a reimplementation is required, rather than copying
the setuptools code.

more discussion here :
http://mail.python.org/pipermail/distutils-sig/2009-February/010980.html

I assume it generates a shell script with no extension on Unix?

Yes

This bug supersedes bpo-1004696.

As a first step, do you agree that newlines have to be translated?

I don't think that they do, any more than for any .py script. (I assume you're talking about in the .py script). Generated scripts on Unix can be whatever the code wants, and on Windows I thought the idea of generated scripts had been dropped.

Sorry, I was unclear. What I meant is: Do you (Tarek and platform experts) agree that scripts (in setup(scripts=...), not generated) need to have platform-specific EOLs?

Thanks for clarifying.

No, I don't agree. Barring fancy "if os.platform" games in setup.py,
scripts will be platform-independent Python code. From "Distributing
Python Modules" section 2.5, "Scripts are files containing Python
source code", and as such, should follow the normal rules for Python
code (from the language reference section 2.1.2, "In source files, any
of the standard platform line termination sequences can be used").

On Windows, that's the end of the story. I believe Unix is the same,
although it's possible that the #! line processing may rely on \n line
endings - I can't comment on this.

The question here is not about the scripts themselves, but rather
about how they are installed. My view is very simple:

• Scripts should be named with a .py extension
• On Windows, they should be installed with a .py extension
• On Unix, I'd be happy with a .py extension, but some Unix users hate
  extensions on commands, and dispute this. (Hence either renaming or
  wrapper suggestions :-)).
• There is some debate as to whether "wrappers" should be generated
  (shell script on Unix, exe on Windows). I'd prefer not, some people
  like them. Ideally, it should be user-configurable, but that's going
  to be messy in the case of bdist_xxx installers.

it's possible that the #! line processing may rely on \n line endings
It does. Python on POSIX can import modules with CLRF, but the shebang machinery can’t parse the first line to get the interpreter to run. Does anyone object about changing that?

Re: generating scripts, I’m moving from -0.5 to +0. I think this requires a bit of summing up previous discussions (bug reports, emails, pros and cons here and there) so I won’t get to it for weeks or months, but someone else is free to do it. I suggest opening a new feature request and linking to it from here.

As noted in bpo-976869, I'm very much in the camp of entry-point based generated scripts, which should clearly use the right line endings for the host platform.

Hacking around with the file copy just doesn't make sense moving forward.

All right, we’re going to follow setuptools’ lead and generate platform-appropriate script or binary files from callables. See the superseder bug report to follow the work that will be done during this summer’s GSoC.