[Nix-dev] Packaging Bash Scripts

[Alexander Foremny]

Dear Shea,

thank you very much. Everything works as expected now.

Regards,
Alexander Foremny

PS. Forwarding to the list. Shea, sorry for the noise.

2012/8/30 Shea Levy <shea at shealevy.com>:
> On 08/29/2012 09:20 AM, Alexander Foremny wrote:
>>
>> Hello Shea,
>>
>> thank you very much for your response! I modified my Nix expression
>> [1]. Is this correct?
>
>
> It looks like you forget to specify what to set $PATH to, I think you need
> to specify ${curl}/bin or some such
>
>
>> Is there a way to test if things are actually working? Apparently I
>> cannot remove curl from my profile.
>
>
> If you check the resultant binary (it will be a shell script if created with
> wrapProgram), you should see $PATH getting set (or augmented) with the
> relevant path.
>
>
>>> $ nix-env -e curl
>>> $ curl --help
>>> Usage: curl [options...]<url>
>>> ...
>>
>> The commands above prints curl's help text which I did not expect.
>>
>> Regards,
>> Alexander Foremny
>>
>> [1]
>> https://github.com/aforemny/nixpkgs/blob/aed5c366944b98624411c5551f2d43becafdf44d/pkgs/tools/misc/plowshare/default.nix
>>
>> 2012/8/29 Shea Levy<shea at shealevy.com>:
>>>
>>> Hi Alexander,
>>>
>>>
>>> On 08/29/2012 05:27 AM, Alexander Foremny wrote:
>>>>
>>>> Hello list,
>>>>
>>>> I am currently trying to create a Nix expression for plowshare [1]. I
>>>> got a working version [2] already, since installation is quite
>>>> straight forward. However, as mentioned in the pull request I am
>>>> worrying about purity.
>>>>
>>>> In particular the Bash script calls the curl binary. The first
>>>> observation is that running one of plowshare's executables the curl
>>>> binary is being found correctly. I think this is because curl is
>>>> available in my PATH.
>>>>
>>>>> $ which curl
>>>>> ~/.nix-profile/bin/curl
>>>>
>>>> I would have expected that this wouldn't be the case if I had removed
>>>> curl from my environment. However, the following still yields the same
>>>> result.
>>>>
>>>>> $ nix-env -e curl
>>>>> $ which curl
>>>>> ~/.nix-profile/bin/curl
>>>>
>>>> This also arises in a newly created shell and I can also execute the
>>>> curl binary. I am guessing that curl is some kind of NixOS' standard
>>>> environment. Is this correct?
>>>>
>>>> Is it considered an impurity that plowshare finds curl without
>>>> depending on curl's derivation? If this is the case, is this impurity
>>>> introduced by NixOS or by the Nix expression?
>>>
>>>
>>> It's an impurity in plowshare's nix expression.
>>>
>>>
>>>> If this is an issue, how would I solve it? Should I patch plowshare's
>>>> Bash scripts to refer to the curl's derivation instead of `which
>>>> curl`? Or even better, is there a wrapper for this kind of programs
>>>> already?
>>>
>>>
>>> wrapProgram (available if you add makeWrapper to buildInputs) is probably
>>> what you want. An example of how it can be used is at
>>>
>>> https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/taxes/aangifte-2011/default.nix#L30
>>>
>>>> Regards,
>>>> Alexander Foremny
>>>>
>>>> [1] http://code.google.com/p/plowshare/
>>>> [2] https://github.com/NixOS/nixpkgs/pull/117
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>>>
>>>
>