Zubin authored 3 years ago and Marge Bot committed 3 years ago

This patch adds the ability to fetch and store dependencies needed for
boostrapping hadrian. By default the script will download the
dependencies from the network but some package managers disallow network
access so there are also options to build given a supplied tarball.

The -s option allos you to provide the tarball

    bootstrap.py -d plan-bootstrap-8.10.5.json -w /path/to-ghc -s sources-tarball.tar.gz

Which dependencies you need can be queried using the `list-sources` option.

    bootstrap.py list-sources -d plan-bootstrap-8.10.5.json

This produces `fetch_plan.json` which tells you where to get each source from.

You can instruct the script to create the tarball using the `fetch` option.

    bootstrap.py fetch -d plan-bootstrap-8.10.5.json -o sources-tarball.tar.gz

Together these commands mean you can build GHC without needing
cabal-install.

Fixes #17103

Matthew Pickering authored 3 years ago and Marge Bot committed 3 years ago

These scripts are originally from the cabal-install repo with a few
small tweaks.

This utility allows you to build hadrian without cabal-install, which can be useful
for packagers. If you are a developer then build hadrian using cabal-install.

If you want to bootstrap with ghc-8.10.5 then run the ./bootstrap script with the
`plan-bootstrap-8.10.5.json` file.

    bootstrap.py -d plan-bootstrap-8.10.5.json -w /path/to-ghc

The result of the bootstrap script will be a hadrian binary in
`_build/bin/hadrian`.

There is a script (using nix) which can be used to generate the bootstrap plans for the range
of supported GHC versions using nix.

    generate_bootstrap_plans

Otherwise you can run the commands in ./generate_bootstrap_plans directly.

Fixes #17103