[Nix-dev] git svn and how to install it please?

[Tony White]

2009/6/11 Jeevakan Suresh <Jeevakan.Suresh at macquarie.com>:
> I think this will solve your problem (add this to your config.nix file)
> {
>    git = { svnSupport = true; };
>    subversion = { perlBindings = true; };
> }
>
> A longer explanation of why you need both lines (and a possible fix) is below:
>
> If you look at the file pkgs/applications/version-management/git-and-tools/default.nix - you will notice the following line
>  svnSupport = getConfig ["git" "svnSupport"] false;
>
> Lines like this are scattered throughout the nixexpr tree, and basically mean 'look this value up in the config file'
>
> However, at the top of pkgs/applications/version-management/git-and-tools/git/default.nix, there is the following line:
>    assert svnSupport -> (subversion != null && perlLibs != [] && subversion.perlBindings);
>
> This is basically stating that subversion needs to be installed with perl bindings, for git svn to work. Now if we look at the default derivation for subversion (in pkgs/top-level/all-packages.nix) the value for perlBindings is the following:
>    perlBindings = getConfig ["subversion" "perlBindings"] false;
>
> So naturally, the assert in git will fail.
>
> For this reason, you need to turn on both subversion perl bindings and svnSupport in git for git-svn to work. I think a better fix would be to ensure the subversion passed into the git derivation always has perl bindings turned on (a major feature of nix is explicit dependency injenction after all) - would anyone be adverse to this change?
>
>
> -----Original Message-----
> From: nix-dev-bounces at cs.uu.nl [mailto:nix-dev-bounces at cs.uu.nl] On Behalf Of Tony White
> Sent: Thursday, 11 June 2009 12:23 PM
> To: Lluís Batlle
> Cc: nix-dev
> Subject: Re: [Nix-dev] git svn and how to install it please?
>
> 2009/6/10 Lluís Batlle <viriketo at gmail.com>:
>> Additionally to the nixos config, there is the nixpkgs config.
>> Usually it's at $HOME/.nixpkgs/config.nix
>>
>> the beginning of top-packages.nix has the config management.
>>
>> the file config.nix should have attributes set like this, as a quick guide:
>> {
>>   git = {
>>       svnSupport = true;
>>   };
>> }
>>
>> The evaluation of any other nixpkgs expression will take into account
>> your config.nix file.
>> You will see in top-packages.nix that you can override the path of the
>> nixpkgs config file with the environment variable NIXPKGS_CONFIG.
>>
>> Regards,
>> Lluís.
>>
>> 2009/6/10 Tony White <tonywhite100 at googlemail.com>:
>>> Hi,
>>> I'd like to use git svn which is a perl module, it's specified in
>>> /etc/nixos/nixpkgs/pkgs/applications/version-management/git-and-tools
>>> /default.nix, however I can't see how to install it.
>>> I've got :
>>>
>>>          environment = {
>>>          extraPackages = [
>>>          pkgs.git
>>>          ];  };
>>>
>>> In configuration.nix and git is there and I can use it from a
>>> konsole, however if I try to use git svn in a konsole, it complains
>>> about it the missing perl module.
>>>
>>> Can't locate SVN/Core.pm in @INC
>>>
>>> I can see :
>>>
>>> svnSupport = getConfig ["git" "svnSupport"] false; # for git-svn
>>> support
>>>
>>> in
>>> /etc/nixos/nixpkgs/pkgs/applications/version-management/git-and-tools
>>> but how do I specify to install it or have I found a problem?
>>>
>>> My first thought was that it was something like :
>>>
>>>          pkgs.git.svnSupport
>>>
>>> That's obviously wrong though.
>>>
>>> Thanks,
>>> Tony
>>> _______________________________________________
>>> nix-dev mailing list
>>> nix-dev at cs.uu.nl
>>> https://mail.cs.uu.nl/mailman/listinfo/nix-dev
>>>
>>
>
> Hi Luis and Marc,
> Thanks for the info Lluís, unfortunately I've not been able to activate the svnSupport switch yet.
>
> Because I want it system wide, I found :
>
> export NIXPKGS_CONFIG=/nix/etc/config.nix
>
> in /etc/nixos/nixos/etc/bashrc.sh
>
> /nix/etc/config.nix did not exist, so I created it and added :
>
> {
>  git = {
>      svnSupport = true;
>  };
> }
>
> to it and then used a sudo nixos-rebuild switch.
> Nothing changed and the error when trying to use git svn still occurs.
>
> Marc, the problem is that there are two ways to call git svn either :
>
> git svn
> or
> git-svn
>
> If they are two different things, I do not know. I do know that git svn (No dash) Is how you call the git-svn executable according to the documentation.
>
> So git-svn or git-svn --help results in the message you have quoted (Even after it has been set to true) :
>
> git-svn not supported, reinstall with config git = { svnSupport = true } set
>
> but git svn --help opens the git-svn manpage in vi and just git svn results in :
>
> Can't locate SVN/Core.pm in @INC (@INC contains:
> /nix/store/fi89ps92826jr4mc6p904l1jyslf7kch-git-1.6.1.3/lib/perl5/site_perl/5.10.0/i686-linux-thread-multi
> /nix/store/fi89ps92826jr4mc6p904l1jyslf7kch-git-1.6.1.3/lib/perl5/site_perl/5.10.0
> /nix/var/nix/profiles/per-user/tony/profile/lib/perl5/site_perl
> /nix/var/nix/profiles/per-user/tony/profile/lib/site_perl
> /nix/var/nix/profiles/default/lib/perl5/site_perl
> /nix/var/nix/profiles/default/lib/site_perl
> /nix/store/d9k73hs12g1ihbs1312fdhq2p0caxf14-perl-5.10.0/lib/perl5/5.10.0/i686-linux-thread-multi
> /nix/store/d9k73hs12g1ihbs1312fdhq2p0caxf14-perl-5.10.0/lib/perl5/5.10.0
> /nix/store/d9k73hs12g1ihbs1312fdhq2p0caxf14-perl-5.10.0/lib/perl5/site_perl/5.10.0/i686-linux-thread-multi
> /nix/store/d9k73hs12g1ihbs1312fdhq2p0caxf14-perl-5.10.0/lib/perl5/site_perl/5.10.0
> .) at /nix/store/fi89ps92826jr4mc6p904l1jyslf7kch-git-1.6.1.3/libexec/git-core//git-svn
> line 29.
>
> I hope this info helps, there's obviously something a little odd happening or maybe I don't understand. If I could understand the expression a little bit better, I would re-write it to just be able to use pkgs.git.svnSupport in configuration.nix, or even just make it default, seeing as it is part of git.
>
> I can't really be sure what to try now other than write a new git expression here, the git expressions are a little too complex for me to understand yet.
>
> Thanks,
> Tony
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>
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>

Thanks Jeevakan,
I tried your suggestion and although I understand what's supposed to
happen, it's just not solved the problem unfortunately.
I'm still seeing the error messages when calling git svn or git-svn,
after adding the
subversion = { perlBindings = true; };
svnSupport just isn't being installed.

Is anyone able to confirm that it works for them?

Thanks,
Tony