this path will be fetched (696.14 MiB download, 2429.92 MiB unpacked):
  /nix/store/hqj210bagnykmd8mj5l2cq9739m9pvfm-dotnet-vmr-10.0.0-rc.2
copying path '/nix/store/hqj210bagnykmd8mj5l2cq9739m9pvfm-dotnet-vmr-10.0.0-rc.2' from 'https://cache.nixos.org'
┏━ Dependency Graph:
┃    ┌─ ⏸ runtime.linux-x64.Microsoft.NETCore.DotNetAppHost-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃    ├─ ⏸ Microsoft.NETCore.App.Runtime.linux-x64-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃    ├─ ⏸ Microsoft.AspNetCore.App.Runtime.linux-x64-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃    ├─ ⏸ Microsoft.NET.ILLink.Tasks-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃    ├─ ⏸ Microsoft.NETCore.App.Host.linux-x64-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃    ├─ ⏸ Microsoft.DotNet.ILCompiler-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃    ├─ ⏸ Microsoft.NETCore.App.Ref-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃    ├─ ⏸ Microsoft.NETCore.DotNetAppHost-10.0.0-rc.2.25502.107 waiting for 1 ↓
┃ ┌─ ⏸ ArcaneLibs-1.0.0-preview.20251104-015635
┃ │  ┌─ ↓ ⏵ dotnet-vmr-10.0.0-rc.2 ⏱ 12s
┃ ├─ ⏸ Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107
┃ ⏸ LibMatrix.Federation-1.0.0-preview.20251101-191010+9065475-dirty
┣━━━ Builds           │ Downloads      
┗━ ∑ ⏵ 0 │ ✔ 0 │ ⏸ 14 │ ↓ 1 │ ↓ 0 │ ⏸ 0 │ ⏱ 13s^C

nom build git+https://cgit.rory.gay/matrix/LibMatrix.git\#LibMatrix-Federation -L

Corngood this is my current version

/nix/store/v83r8fyhb9sc0raa0h5vg8549nslpq7p-LibMatrix.Federation-1.0.0-preview.20251101-191010+9065475-dirty.drv
└───/nix/store/1x4bh50ajp1xs1wf08c92sik2vmp3n2m-Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107.drv
    └───/nix/store/4f5c88n0bigz2r93hmjgvayq3h18qc2x-dotnet-vmr-10.0.0-rc.2.drv

this is what nix why-depends --derivation has to say

I don't understand this yet, but:

$ nix build --dry-run /nix/store/1x4bh50ajp1xs1wf08c92sik2vmp3n2m-Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107.drv^\*
this derivation will be built:
  /nix/store/1x4bh50ajp1xs1wf08c92sik2vmp3n2m-Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107.drv
this path will be fetched (696.14 MiB download, 2429.92 MiB unpacked):
  /nix/store/hqj210bagnykmd8mj5l2cq9739m9pvfm-dotnet-vmr-10.0.0-rc.2

$ nix path-info result/ -r
/nix/store/0ja5daq2yay3svg6f48spyfby7pgy5bm-xgcc-14.3.0-libgcc
/nix/store/v5zyzcc8slz7w73s3wpgysd4z2grz6w0-libunistring-1.4
/nix/store/f04v56v4i3z0mrvl2npgcx5k5a792yjc-libidn2-2.3.8
/nix/store/daamdpmaz2vjvna55ccrc30qw3qb8h6d-glibc-2.40-66
/nix/store/llswcygvgv9x2sa3z6j7i0g5iqqmn5gn-openssl-3.6.0
/nix/store/mnd897flngivhxnw8sxznhrcwwc9vyk3-gcc-14.3.0-libgcc
/nix/store/z7a34j3xnp66rpddayyxrxwsahxccbip-gcc-14.3.0-lib
/nix/store/v72pwpdh1xnkkj73cck5ywfcwlmpsrr4-Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107

I don't understand this yet, but:

$ nix build --dry-run /nix/store/1x4bh50ajp1xs1wf08c92sik2vmp3n2m-Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107.drv^\*
this derivation will be built:
  /nix/store/1x4bh50ajp1xs1wf08c92sik2vmp3n2m-Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107.drv
this path will be fetched (696.14 MiB download, 2429.92 MiB unpacked):
  /nix/store/hqj210bagnykmd8mj5l2cq9739m9pvfm-dotnet-vmr-10.0.0-rc.2

$ nix path-info result/ -r
/nix/store/0ja5daq2yay3svg6f48spyfby7pgy5bm-xgcc-14.3.0-libgcc
/nix/store/v5zyzcc8slz7w73s3wpgysd4z2grz6w0-libunistring-1.4
/nix/store/f04v56v4i3z0mrvl2npgcx5k5a792yjc-libidn2-2.3.8
/nix/store/daamdpmaz2vjvna55ccrc30qw3qb8h6d-glibc-2.40-66
/nix/store/llswcygvgv9x2sa3z6j7i0g5iqqmn5gn-openssl-3.6.0
/nix/store/mnd897flngivhxnw8sxznhrcwwc9vyk3-gcc-14.3.0-libgcc
/nix/store/z7a34j3xnp66rpddayyxrxwsahxccbip-gcc-14.3.0-lib
/nix/store/v72pwpdh1xnkkj73cck5ywfcwlmpsrr4-Microsoft.NETCore.App.Crossgen2.linux-x64-10.0.0-rc.2.25502.107

edit: oh, hang on, I think I know what's going on. None of the nuget packages are in the binary cache because they aren't recursed-into. That should be pretty easy to fix. I just never noticed because I always build VMR when doing upgrades, and they are trivial builds based on it.

Nudging my issue where I can't run debug on an app via VS on my NixOS system. From what I'm aware, I should have all of the packages needed for it?
(I originally forgot to include the package list that I'm using for the environment, whoops!)

{
  devShells.${system}.default = pkgs.mkShell {
    env.DOTNET_CLI_TELEMETRY_OPTOUT = true;
    buildInputs = [
      pkgs.avalonia-ilspy
      pkgs.dotnetCorePackages.sdk_9_0
      pkgs.netcoredbg
      ( pkgs.vscode-with-extensions.override {
          vscodeExtensions = [
            pkgs.vscode-extensions.ms-dotnettools.csdevkit
            pkgs.vscode-extensions.ms-dotnettools.csharp
            pkgs.vscode-extensions.ms-dotnettools.vscode-dotnet-runtime
          ];
        }
      )
    ];
  };
};