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Nix Hackers

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For people hacking on the Nix package manager itself207 Servers

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31 Jan 2026
@figsoda:matrix.orgfigsoda joined the room.20:22:49
@figsoda:matrix.orgfigsoda Is there some way to specify the name of the output path when using nix flake prefetch or fetchTree? I digged a little through the source code, and it seems like name is an attribute that defaults to source and passed around, but I couldn't find any way to change it to something other than the default. 20:27:47
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)
In reply to @figsoda:matrix.org
Is there some way to specify the name of the output path when using nix flake prefetch or fetchTree? I digged a little through the source code, and it seems like name is an attribute that defaults to source and passed around, but I couldn't find any way to change it to something other than the default.
Don’t think so, it’s only allowed for fetchGit
20:44:05
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)FetchTreeParams::allowNameArgument20:44:24
@figsoda:matrix.orgfigsodaThanks for the pointers, do you know if there is a design reason why that's the case? Or is it just that they haven't got around to implementing it, and it was just there so fetchGit can use fetchTree20:48:11
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)
In reply to @figsoda:matrix.org
Thanks for the pointers, do you know if there is a design reason why that's the case? Or is it just that they haven't got around to implementing it, and it was just there so fetchGit can use fetchTree
Honestly I don’t know. “source” is special-cases in all sorts of places in the store layer and the justification is probably along the lines of why that used to be preferred for FOD fetchers in nixpkgs - when changing the fetcher the outpath would stay the same. Whether that’s a good idea is another question
20:50:09
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)
In reply to @figsoda:matrix.org
Thanks for the pointers, do you know if there is a design reason why that's the case? Or is it just that they haven't got around to implementing it, and it was just there so fetchGit can use fetchTree
* Honestly I don’t know. “source” is special-cased in all sorts of places in the store layer and the justification is probably along the lines of why that used to be preferred for FOD fetchers in nixpkgs - when changing the fetcher the outpath would stay the same. Whether that’s a good idea is another question
20:50:51
@figsoda:matrix.orgfigsodaThanks anyway, I'll probably open an issue later20:51:16
@eveeifyeve:matrix.orgeveeifyeve Sergei Zimmerman (xokdvium): is it werid for a test to error out on my pr? Because I can't seem to debug the netrc isn't an absolute path thing. 20:52:03
@eveeifyeve:matrix.orgeveeifyevehttps://github.com/NixOS/nix/pull/15041/20:52:30
@eveeifyeve:matrix.orgeveeifyeve * Sergei Zimmerman (xokdvium): is it werid for a test to error out on my pr? Because I can't seem to debug the netrc isn't an absolute path thing reproduced the test error locally, but I don't know where I can start to debug it. 20:53:29
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)Builtin builder does set it to a relative path apparently20:54:33
@eveeifyeve:matrix.orgeveeifyeveHuh werid?20:55:56
1 Feb 2026
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