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Bootstrap files
Currently nixpkgs
builds most of it's packages using bootstrap seed
binaries (without the reliance on external inputs):
bootstrap-tools
: an archive with the compiler toolchain and other helper tools enough to build the rest of thenixpkgs
.- initial binaries needed to unpack
bootstrap-tools.*
. Onlinux
it's justbusybox
, ondarwin
it is unpack.nar.xz which contains the binaries and script needed to unpack the tools. These binaries can be executed directly from the store.
These are called "bootstrap files".
Bootstrap files should always be fetched from hydra and uploaded to
tarballs.nixos.org
to guarantee that all the binaries were built from
the code committed into nixpkgs
repository.
The uploads to tarballs.nixos.org
are done by @lovesegfault
today.
This document describes the procedure of updating bootstrap files in
nixpkgs
.
How to request the bootstrap seed update
To get the tarballs updated let's use an example i686-unknown-linux-gnu
target:
-
Create a local update:
$ maintainers/scripts/bootstrap-files/refresh-tarballs.bash --commit --targets=i686-unknown-linux-gnu
-
Test the update locally. I'll build local
hello
derivation with the result:$ nix-build -A hello --argstr system i686-linux
To validate cross-targets
binfmt
NixOS
helper can be useful. Forriscv64-unknown-linux-gnu
the/etc/nixos/configuration.nix
entry would beboot.binfmt.emulatedSystems = [ "riscv64-linux" ]
. -
Propose the commit as a PR to update bootstrap tarballs, tag people who can help you test the updated architecture and once reviewed tag
@lovesegfault
to upload the tarballs.
Bootstrap files job definitions
There are two types of bootstrap files:
-
natively built
stdenvBootstrapTools.build
hydra jobs innixpkgs:trunk
jobset. Incomplete list of examples is:aarch64-unknown-linux-musl.nix
i686-unknown-linux-gnu.nix
These are Tier 1 hydra platforms.
-
cross-built by
bootstrapTools.build
hydra jobs innixpkgs:cross-trunk
jobset. Incomplete list of examples is:mips64el-unknown-linux-gnuabi64.nix
mips64el-unknown-linux-gnuabin32.nix
mipsel-unknown-linux-gnu.nix
powerpc64le-unknown-linux-gnu.nix
riscv64-unknown-linux-gnu.nix
These are usually Tier 2 and lower targets.
The .build
job contains /on-server/
subdirectory with binaries to
be uploaded to tarballs.nixos.org
.
The files are uploaded to tarballs.nixos.org
by writers to S3
store.