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From: iyzsong@member.fsf.org (=?utf-8?B?5a6L5paH5q2m?=)
Subject: Re: Python and propagation
Date: Fri, 19 Feb 2016 09:26:33 +0800
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To: Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>
Cc: guix-devel <guix-devel@gnu.org>

iyzsong@member.fsf.org (=E5=AE=8B=E6=96=87=E6=AD=A6) writes:

>> [...]
>
> I packaged python-hy, and it does find all depends without propagations.
> In its output, the trick is done by =E2=80=98python-hy-0.11.1.pth=E2=80=
=99 and =E2=80=98site.py=E2=80=99.
>
> After read:
>   <https://docs.python.org/2/library/site.html>
>   <http://stackoverflow.com/questions/15208615/using-pth-files>
>
> I try:
> $ mkdir -p /tmp/o
> $ mkdir -p /tmp/a
> $ echo /tmp/a > /tmp/o/x.pth
> $ cat > /tmp/o/sitecustomize.py << EOF
>> import os, site
>> dir =3D os.path.dirname(os.path.abspath(__fil__))
>> site.addsitedir(dir)
>> EOF
> $ PYTHONPATH=3D/tmp/o python3 -c 'import sys; print(sys.path)
> And =E2=80=98/tmp/a=E2=80=99 is at the end of the list.
>
> So, I think if we get all the pth files correct, no need to use
> propagate-inputs :-)
Oops, I=E2=80=99m naive.  Be able to handle indirect inputs,  pth files sho=
uld
be loaded recursively.  And this was the way in nixpkgs [1], but
deprecated now [2].

It=E2=80=99s safe to ignore me :-)

[1] https://github.com/NixOS/nixpkgs/pull/258
[2] https://github.com/NixOS/nixpkgs/pull/11086