Re: [Nix-dev] setting environment values.
2015-01-28 15:02 GMT-02:00 Tim Sears :
> Thanks Stewart. Do you happen to know if other nix commands (nix-shell,
> nix-build) use or ignore the extraCmds attribute? Or if any build phase uses
> it. I haven't found much documentation or code so far.
>
> I made some progress based on an earlier suggestion, by simply adding
> environment variables in the call to mkDerivation. The package is a library
> and want to propagate the variables to another library that depends on this
> one, and so on, downstream.
>
I think you can use setup hooks. Do a simple "git grep setupHook" on
nixpkgs tree, and you will find a lot of interesting setup scripts...
A good example is to set QTDIR on Qt4 scripts.
> On Wed, Jan 28, 2015 at 1:03 AM, stewart mackenzie
> wrote:
>>
>> add something like this:
>>
>>extraCmds = ''
>> export SOMEPATH_ERLANG=${erlang}/opt/path/to/libs;
>>
>>'';
>>};
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>
>
>
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Re: [Nix-dev] setting environment values.
Okay, I'm at the point too where I need to see your nix-expression.
Though, by creating a package, in other nix-expressions you would
simply refer to that library by ${library_name}. That should achieve
your propagation needs.
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Re: [Nix-dev] setting environment values.
Thanks Luca. I wanted to strip out unnecessary details. Will post a gist next time. ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] setting environment values.
Thanks Stewart. Do you happen to know if other nix commands (nix-shell,
nix-build) use or ignore the extraCmds attribute? Or if any build phase
uses it. I haven't found much documentation or code so far.
I made some progress based on an earlier suggestion, by simply adding
environment variables in the call to mkDerivation. The package is a library
and want to propagate the variables to another library that depends on this
one, and so on, downstream.
On Wed, Jan 28, 2015 at 1:03 AM, stewart mackenzie
wrote:
> add something like this:
>
>extraCmds = ''
> export SOMEPATH_ERLANG=${erlang}/opt/path/to/libs;
>
>'';
>};
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> nix-dev@lists.science.uu.nl
> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>
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Re: [Nix-dev] setting environment values.
Hi, There is makeWrapper [1] which wraps your binary in a shell script that sets some variables before execution. See e.g. [2] for how apache maven uses it to set JAVA_HOME. Is that what you are looking for? ~ [1] https://nixos.org/wiki/Nix_Runtime_Environment_Wrapper [2] https://github.com/NixOS/nixpkgs/blob/72e76a18c122ec657fd6825764be79db8d73b3ce/pkgs/development/tools/build-managers/apache-maven/builder.sh#L8 On 27 January 2015 at 18:48, Tim Sears wrote: > I am writing a nix expression to port some libraries from another distro. > > The libraries have slightly non-standard locations so I would typically > add some line to my .bashrc file like > > export SOMEVAR="somestring" > export SOMEPATH=/opt/path/to/libs > export LD_LIBRARY_PATH=$SOMEPATH:$LD_LIBRARY_PATH. > > What is the nix way of doing this? I can set SOMEVAR="somestring" in the > derivation expression, and it appears in my environment after executing > nix-shell, but SOMEPATH should look like $out/path/to/libs and I am not > sure how/where to set that. > > Suggestions appreciated. > -Tim > > ___ > nix-dev mailing list > nix-dev@lists.science.uu.nl > http://lists.science.uu.nl/mailman/listinfo/nix-dev > > ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] setting environment values.
add something like this:
extraCmds = ''
export SOMEPATH_ERLANG=${erlang}/opt/path/to/libs;
'';
};
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Re: [Nix-dev] setting environment values.
Tim you need to do something like this:
```
let
pkgs = import {};
stdenv = pkgs.stdenv;
in rec {
erlangEnv = pkgs.myEnvFun {
name = "erlang";
buildInputs = with pkgs; [ erlang rebar openssl git binutils
bash emacs which mc meld tig elixir ];
extraCmds = ''
export POSTGRES_PASS=password;
export MAILGUN_KEY=my_mailgun_api_key;
export MAILGUN_DOMAIN=cont...@email.org;
'';
};
}
```
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Re: [Nix-dev] setting environment values.
On 27/01/2015 19:48, Tim Sears wrote: > I am writing a nix expression to port some libraries from another distro. > > The libraries have slightly non-standard locations so I would > typically add some line to my .bashrc file like > > export SOMEVAR="somestring" > export SOMEPATH=/opt/path/to/libs > export LD_LIBRARY_PATH=$SOMEPATH:$LD_LIBRARY_PATH. > > What is the nix way of doing this? I can set SOMEVAR="somestring" in > the derivation expression, and it appears in my environment after > executing nix-shell, but SOMEPATH should look like $out/path/to/libs > and I am not sure how/where to set that. > It's a little hard to answer such a question, we miss some information. First of all, paste the expression. ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
[Nix-dev] setting environment values.
I am writing a nix expression to port some libraries from another distro. The libraries have slightly non-standard locations so I would typically add some line to my .bashrc file like export SOMEVAR="somestring" export SOMEPATH=/opt/path/to/libs export LD_LIBRARY_PATH=$SOMEPATH:$LD_LIBRARY_PATH. What is the nix way of doing this? I can set SOMEVAR="somestring" in the derivation expression, and it appears in my environment after executing nix-shell, but SOMEPATH should look like $out/path/to/libs and I am not sure how/where to set that. Suggestions appreciated. -Tim ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
