system: build for riscv64-unknown-linux-gnu

[0x4A6F]

Motivation

With the advent of increasing RISC-V plaforms, it would be nice to also have a (cross-compiled) nix tarball available to be consumed by our nix installation methods.

Context

Currently the nix installation instructions both errors out on riscv64-linux systems with following:

# curl -sL https://nixos.org/nix/install | sh -s -- --daemon
sh: sorry, there is no binary distribution of Nix for your platform

# curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
nix-installer: unknown CPU type: riscv64

With these changes I was able to produce the required output to install nix on a riscv64-linux system (running Debian).

nix --extra-experimental-features 'nix-command flakes' build .#hydraJobs.binaryTarballCross.x86_64-linux.riscv64-unknown-linux-gnu

Priorities and Process

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[edolstra]

Note that this PR in itself does not cause the build to be added to the installer. For that you would need to add it to maintainers/upload-release.pl.

[fricklerhandwerk]

Triaged in the Nix team meeting:

• Fine to merge without making support promises
• Please add an entry to the list of supported platforms: https://hydra.nixos.org/build/254313980/download/1/manual/contributing/hacking.html#platforms
  • That list should be auto-generated, but that's not for today
• @roberth side note: would be great to have a list of people to ping if we have a build failure
  • Could use meta.maintainers in the derivation, but doesn't really matter how it's done exactly

[0x4A6F]

We do have matrix:r/riscv:nixos.org for communication. Build failures can be reported there.
If lib.maintainers is used at least my handle (_0x4A6F) can be used.

[fgaz]

If lib.maintainers is used at least my handle (_0x4A6F) can be used

Also mine ✋

[silvanshade]

If lib.maintainers is used at least my handle (_0x4A6F) can be used

Also mine ✋

I'd also like to participate.

[fricklerhandwerk]

Thanks! And sorry for the extended delay in merging.

[Ericson2314]

Forgot the -unknown-

Suggested change

	downloadFile("binaryTarballCross.x86_64-linux.riscv64-linux-gnu", "1");
	downloadFile("binaryTarballCross.x86_64-linux.riscv64-unknown-linux-gnu", "1");