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Nix + dotnet

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4 Feb 2026
@emma:rory.gayEmma [it/its]
Spacebar.Interop.Authentication.AspNetCore> Build FAILED.
Spacebar.Interop.Authentication.AspNetCore>        "/build/source/Spacebar.Interop.Authentication.AspNetCore.csproj" (Restore target) (1) ->
Spacebar.Interop.Authentication.AspNetCore>        (Restore target) ->
Spacebar.Interop.Authentication.AspNetCore>          /build/source/Spacebar.Interop.Authentication.AspNetCore.csproj : error NU1101: Unable to find package ArcaneLibs. No packages exist with this id in source(s): /nix/store/q8dadmxlzghlh64rgmvpkxka32yg44n9-dotnet-sdk-10.0.102/share/dotnet/library-packs, _nix
Spacebar.Interop.Authentication.AspNetCore>          /build/source/Spacebar.Interop.Authentication.AspNetCore.csproj : error NU1101: Unable to find package Spacebar.Models.Db. No packages exist with this id in source(s): /nix/store/q8dadmxlzghlh64rgmvpkxka32yg44n9-dotnet-sdk-10.0.102/share/dotnet/library-packs, _nix
Spacebar.Interop.Authentication.AspNetCore>          /build/source/Spacebar.Interop.Authentication.AspNetCore.csproj : error NU1101: Unable to find package System.IdentityModel.Tokens.Jwt. No packages exist with this id in source(s): /nix/store/q8dadmxlzghlh64rgmvpkxka32yg44n9-dotnet-sdk-10.0.102/share/dotnet/library-packs, _nix
02:29:03
13 Feb 2026
@corngood:corngood.comCorngood https://github.com/NixOS/nixpkgs/pull/489952 The February releases include .net 11 preview 104:08:37
@hoplophfeil:matrix.orghoplopf joined the room.10:26:59
@jammie:matrix.orgJamieMageeCould use a review if anyone has time: https://github.com/NixOS/nixpkgs/pull/49021520:35:03
15 Feb 2026
@flafydev:matrix.orgFlafy (moving to @flafy:flafy.dev) changed their display name from Flafy (moving to @flafy:flafy.dev) to Flafy.21:47:39
@lostmsu:matrix.orglostmsu JamieMagee: I pinged you as I had a similar PR open for a while. I also bump SDK to .NET 10 (so that we won't have to touch this for a while). 23:25:02
@lostmsu:matrix.orglostmsu * JamieMagee: I pinged you as I had a similar PR open. I also bump SDK to .NET 10 (so that we won't have to touch this for a while). 23:25:14
@lostmsu:matrix.orglostmsuMy PR: https://github.com/NixOS/nixpkgs/pull/48660523:27:10
@lostmsu:matrix.orglostmsuBTW, I am co-maintainer of Python.NET (not just on NixOS)23:27:41
19 Feb 2026
@whovian9369:matrix.orgWhovian9369

Hello! What exactly should I do if I go to build a derivation and run into this error?

ln: failed to create symbolic link '/build/nuget.1U96kM/fallback/microsoft.netcore.app.runtime.linux-x64/8.0.23': File exists

19:55:31
@whovian9369:matrix.orgWhovian9369 Oh it's likely something to do with repeated entries in deps.json - I'll see if regenerating that fixes it! 20:00:53
@whovian9369:matrix.orgWhovian9369 Yep, that was it - Whoops. Oh well, apologies! 20:02:17
21 Feb 2026
@emma:rory.gayEmma [it/its]hm, i wonder why buildDotnetModule would... ignore a deps.json file?04:04:30
@emma:rory.gayEmma [it/its]particularly, i did the fetch-deps stuff, the deps.json isnt empty, its staged into git, its referenced in my derivation, yet it complains it cant find any dependencies04:08:12
@emma:rory.gayEmma [it/its]cleared out the deps file and i noticed that it doesnt even seem to write to it, it just does nothing04:36:02
@corngood:corngood.comCorngoodfetch-deps can only write directly to a deps.json when it's evaluated impure. Maybe you're evaluating it through a flake? In that case you can pass it the output path as a command line arg 14:22:32
22 Feb 2026
@blazeeaglegale09:matrix.orgBlaze joined the room.02:54:34
@emma:rory.gayEmma [it/its]that's what im doing already23:40:09
@emma:rory.gayEmma [it/its] hence it not making sense that it just... returns [] 23:41:03
23 Feb 2026
@corngood:corngood.comCorngoodYou can run `fetch-drv` in a dev shell and then see what ends up in the nuget packages dir.00:54:11
13 Oct 2022
@winterqt:nixos.devWinter (she/her) joined the room.17:56:01
12 Nov 2022
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16 Nov 2022
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25 Nov 2022
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1 Dec 2022
@hexa:lossy.networkhexa changed their display name from hexa to hexa (22.11 now).13:08:55
@hexa:lossy.networkhexa changed their display name from hexa (22.11 now) to hexa.14:38:43
12 Jan 2023
@daniel:nopemail.orgdaniel joined the room.12:58:04
@daniel:nopemail.orgdanielAnyone who has some experience with packaging a .NET-project using flakes? All prior art I’ve found seems to use the legacy way.13:02:55
@winterqt:nixos.devWinter (she/her)
In reply to @daniel:nopemail.org
Anyone who has some experience with packaging a .NET-project using flakes? All prior art I’ve found seems to use the legacy way.

flakes are the same way as the "legacy way," all flakes help with is exposing the package.

what trouble are you running into?

14:23:13

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