stdenv/linux/bootstrap-files: add mipsel-linux (mips32)

[ghost]

Description of changes

This PR adds Hydra-generated bootstrap tarballs for mipsel-linux. I'll be following the script established in #151399, which I previously used in #168199 and #180223.

Files came from this Hydra build, which used nixpkgs revision 5bd14b3 to instantiate:

/nix/store/184fa520zv8ls9fzcqyfa5dmkp8kf6xr-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu.drv

and then built:

/nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu

I downloaded these files from Hydra with the following commands:

STOREPATH=i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu
OPTIONS="--option binary-caches https://cache.nixos.org --option trusted-public-keys cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
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/a976a16k2n9bir7yjmdm6n98765spn4m-busybox
Downloaded 'file:///nix/store/a976a16k2n9bir7yjmdm6n98765spn4m-busybox' to '/nix/store/gcvkvka0zjcn50n6pnbjgmar8swpw7bi-a976a16k2n9bir7yjmdm6n98765spn4m-busybox' (hash 'sha256-EhuzjL52VEIOfEcFdVGZaDMClQbMc9V9ISrTUNaA7HQ=').

$ nix store prefetch-file  file:///nix/store/8q53wpn7lk7j45bwqwyn75p39qa8ajam-bootstrap-tools.tar.xz
Downloaded 'file:///nix/store/8q53wpn7lk7j45bwqwyn75p39qa8ajam-bootstrap-tools.tar.xz' to '/nix/store/0shmi3qk2my2x7c1c5dhv04l673mal36-8q53wpn7lk7j45bwqwyn75p39qa8ajam-bootstrap-tools.tar.xz' (hash 'sha256-OEGgLJOLnV+aobsb+P8mY3Dp8qbeVODBH6x3aUE/MGM=').

And started the bootstrap with the following command on a mips64el machine (the --arg localsystem forces nixpkgs to build for mips32 and the --option extra-platforms convinces nix that mips64el machines can run mips32el code):

nix build -f . -L hello \
  --arg localSystem '(import ./lib).systems.examples.mipsel-linux-gnu' \
  --option extra-platforms 'mipsel-linux'

I also edited pkgs/stdenv/linux/default.nix to change longsoon2f.nix to mipsel.nix. That change is not part of this PR; I will submit it separately since it may require more discussion than a simple bootstrap-files upload does.

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

$ sha256sum /nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/*
3841a02c938b9d5f9aa1bb1bf8ff266370e9f2a6de54e0c11fac7769413f3063  /nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/bootstrap-tools.tar.xz
ba0645bb4a626f0a3fe4f30f0b92211c41482f0604825f1d1cab99e1e42d1bd9  /nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/busybox

Things done

• Built on platform(s)
  • mips64el-linux (with openssl: Rosetta Stone entry for mips32 #185176)
• Tested basic functionality of ${hello}/bin/hello
• Fits CONTRIBUTING.md.

[ghost]

Ping @lovesegfault

[ghost]

Ping @lovesegfault

[ghost]

@lovesegfault, could you please upload these files to tarballs.nixos.org?

[lovesegfault]

Done:

$ aws s3 cp --recursive --acl public-read /nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/ s3://nixpkgs-tarballs/stdenv-linux/mipsel/5bd14b3cfe2f87a2e2b074645aba39c
69563e4bc/
upload: ../../../../nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/busybox to s3://nixpkgs-tarballs/stdenv-linux/mipsel/5bd14b3cfe2f87a2e2b074645aba39c69563e4bc/busybox
upload: ../../../../nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/bootstrap-tools.tar.xz to s3://nixpkgs-tarballs/stdenv-linux/mipsel/5bd14b3cfe2f87a2e2b074645aba39c69563e4bc/bootstrap-tools.tar.xz
$ aws s3 cp --recursive s3://nixpkgs-tarballs/stdenv-linux/mipsel/5bd14b3cfe2f87a2e2b074645aba39c69563e4bc ./
download: s3://nixpkgs-tarballs/stdenv-linux/mipsel/5bd14b3cfe2f87a2e2b074645aba39c69563e4bc/busybox to ./busybox
download: s3://nixpkgs-tarballs/stdenv-linux/mipsel/5bd14b3cfe2f87a2e2b074645aba39c69563e4bc/bootstrap-tools.tar.xz to ./bootstrap-tools.tar.xz
$ sha256sum /nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/*
3841a02c938b9d5f9aa1bb1bf8ff266370e9f2a6de54e0c11fac7769413f3063  /nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/bootstrap-tools.tar.xz
ba0645bb4a626f0a3fe4f30f0b92211c41482f0604825f1d1cab99e1e42d1bd9  /nix/store/i46mrzinxi9a5incliwhksmk947ff4wn-stdenv-bootstrap-tools-mipsel-unknown-linux-gnu/on-server/busybox
$ sha256sum ./bootstrap-tools.tar.xz ./busybox
3841a02c938b9d5f9aa1bb1bf8ff266370e9f2a6de54e0c11fac7769413f3063  ./bootstrap-tools.tar.xz
ba0645bb4a626f0a3fe4f30f0b92211c41482f0604825f1d1cab99e1e42d1bd9  ./busybox

As always, very sorry for the delay in getting to these!

Let me know if this can be merged :)

[ghost]

Thank you so much! If you have time to do the same for #185182 I would appreciate it.

Let me know if this can be merged :)

Yes, it is ready to merge.

From an empty /nix/store, the following command got past the unpacking-the-bootstrap-files step:

nix build \
  -f . \
  -L hello \
  --arg localSystem '(import ./lib).systems.examples.mipsel-linux-gnu' \
  --system mipsel-linux \
  --option filter-syscalls false

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/bootstrap-files-updates-amplifiy-exploit-of-any-package-into-exploit-of-every-package/50534/1