pkgs/stdenv/linux: add mips64el bootstrap-files

[ghost]

Description of changes

This PR adds Hydra-generated bootstrap tarballs for mips64el-linux. I'll be following the script established in #151399, which I previously used in #168199.

Files came from this Hydra build, which used nixpkgs revision ef3fe25 to instantiate:

/nix/store/a2bvv663wjnyhq8m7v84aspsd3sgf9h6-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64.drv

and then built:

/nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64

I downloaded these files from Hydra with the following commands:

STOREPATH=aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64
OPTIONS="--option binary-caches https://cache.nixos.org"
nix store add-file \
  --name bootstrap-tools.tar.xz  \
  $(nix-store ${OPTIONS} -r /nix/store/${STOREPATH})/on-server/bootstrap-tools.tar.xz
nix store add-path \
  --name busybox \
  $(nix-store ${OPTIONS} -r /nix/store/${STOREPATH})/on-server/busybox

I then prefetched them into /nix/store with:

$ nix store prefetch-file --executable file:///nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/busybox
Downloaded 'file:///nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/busybox' to '/nix/store/ai30ss23914syz6j8m95arkwffbbx44k-busybox' (hash 'sha256-sTE58ofjqAqX3Xtq1g9wDxzIe6Vo//GHbicfqJoivDI=').

$ nix store prefetch-file  file:///nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/bootstrap-tools.tar.xz
Downloaded 'file:///nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/bootstrap-tools.tar.xz' to '/nix/store/nr6zjrbwbxcxs6brf042zsyqllwbwj9v-bootstrap-tools.tar.xz' (hash 'sha256-tTgjeXpd2YgnfP4JvRuO0bXd2j8GqzBcd57JI3wH9x0=').

And started the bootstrap with the following command (the --arg localSystem is needed because #161159 has not merged):

nix build -f . -L hello --arg localSystem '(import ./lib).systems.examples.mips64el-linux-gnuabi64'

As @lovesegfault requested in #151399, here are the the sha256sums of all the on-server components for extra verification:

$ sha256sum /nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/*
b53823797a5dd988277cfe09bd1b8ed1b5ddda3f06ab305c779ec9237c07f71d  /nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/bootstrap-tools.tar.xz
598e05abb69b2c1a0db46585cd2131212077c0937ce2a665daf3811f059ae767  /nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/busybox

Things done

• Built on platform(s)
  • mips64el-linux
• Tested basic functionality of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

[ghost]

I have verified that, on mips64el-linux-gnuabi64, ef3fe25 plus this PR will successfully bootstrap stdenv and build hello.

I'm currently doing nix build -f. -L nix under the same conditions to make sure nix can be built out of nixpkgs. As soon as that build completes I will undraftify this and declare victory.

[ghost]

Good to go. A few small fixes are needed for non-cross builds of the latest nix on mips, but they have nothing to do with the bootstrap-files.

@lovesegfault, please let us know when you have uploaded these files to tarballs.nixos.org.

[ghost]

A few small fixes are needed for non-cross builds of the latest nix on mips

Specifically: mips64el can build its own nix binary with this PR plus #181160, #181654, and #161159 using the following command:

nix-build - <<\EOF
with import <nixpkgs> { }; nix.override {

 # aws-sdk-cpp broke on mips sometime in the past three months
 withAWS = false;

 # nlohmann_json tests broke on mips sometime in the past three months
 nlohmann_json = nlohmann_json.overrideAttrs (_: { doCheck=false; });

 # to avoid having to build all of Rust
 enableDocumentation = false;

}
EOF

[lovesegfault]

Hi Adam,

I'll try to get to this today, thanks for being patient :)

[lovesegfault]

They should be up :)

$ aws s3 cp --recursive --acl public-read /nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/ s3://nixpkgs-tarballs/stdenv-linux/mips64el/ef3fe254f3c59455386bc92fe84164f9679b92b1/
upload: ../../../../nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/busybox to s3://nixpkgs-tarballs/stdenv-linux/mips64el/ef3fe254f3c59455386bc92fe84164f9679b92b1/busybox
upload: ../../../../nix/store/aw3dmsrh22831l83vi3q9apg9qi3x8ms-stdenv-bootstrap-tools-mips64el-unknown-linux-gnuabi64/on-server/bootstrap-tools.tar.xz to s3://nixpkgs-tarballs/stdenv-linux/mips64el/ef3fe254f3c59455386bc92fe84164f9679b92b1/bootstrap-tools.tar.xz

$ aws s3 ls --recursive s3://nixpkgs-tarballs/stdenv-linux/mips64el/
2022-07-16 01:57:13   21346844 stdenv-linux/mips64el/ef3fe254f3c59455386bc92fe84164f9679b92b1/bootstrap-tools.tar.xz
2022-07-16 01:57:13     256648 stdenv-linux/mips64el/ef3fe254f3c59455386bc92fe84164f9679b92b1/busybox

$ aws s3 cp --recursive s3://nixpkgs-tarballs/stdenv-linux/mips64el/ ./                                            
download: s3://nixpkgs-tarballs/stdenv-linux/mips64el/ef3fe254f3c59455386bc92fe84164f9679b92b1/busybox to ef3fe254f3c59455386bc92fe84164f9679b92b1/busybox
download: s3://nixpkgs-tarballs/stdenv-linux/mips64el/ef3fe254f3c59455386bc92fe84164f9679b92b1/bootstrap-tools.tar.xz to ef3fe254f3c59455386bc92fe84164f9679b92b1/bootstrap-tools.tar.xz

$ sha256sum ef3fe254f3c59455386bc92fe84164f9679b92b1/*
b53823797a5dd988277cfe09bd1b8ed1b5ddda3f06ab305c779ec9237c07f71d  ef3fe254f3c59455386bc92fe84164f9679b92b1/bootstrap-tools.tar.xz
598e05abb69b2c1a0db46585cd2131212077c0937ce2a665daf3811f059ae767  ef3fe254f3c59455386bc92fe84164f9679b92b1/busybox

[ghost]

Thanks @lovesegfault, I was able to verify with the commands below.

This PR is ready to merge. Nixpkgs is now capable of bootstrapping itself on a fifth architecture.

git fetch https://github.com/NixOS/nixpkgs/ pull/180223/head
git checkout FETCH_HEAD

git fetch https://github.com/NixOS/nixpkgs/ pull/181160/head && git cherry-pick FETCH_HEAD
git fetch https://github.com/NixOS/nixpkgs/ pull/181654/head && git cherry-pick FETCH_HEAD
git fetch https://github.com/NixOS/nixpkgs/ pull/161159/head && git cherry-pick FETCH_HEAD

nix build -L $(nix-instantiate - <<\EOF
with import <nixpkgs> { }; nix.override {

 # aws-sdk-cpp broke on mips sometime in the past three months
 withAWS = false;

 # nlohmann_json tests broke on mips sometime in the past three months
 nlohmann_json = nlohmann_json.overrideAttrs (_: { doCheck=false; });

 # to avoid having to build all of Rust
 enableDocumentation = false;

}
EOF
)

[lovesegfault]

Wonderful! Thanks!