Add support for importing nix fetchTarball/fetchGit expressions #30
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Nix is able to fetch and extract tarballs and git repositories in its
evaluation phase, which is used for fixing nixpkgs to a certain commit
in nix code. It provides `builtins.fetchTarball` and
`builtins.fetchGit` for that purpose.
We want to be able to re-use the resulting storepath as a bazel
target.
If you have a nix file like:
builtins.fetchTarball {
url = "example.com/mytarball.tar.gz";
sha256 = …;
}
You can make the contents of that tarball accessible as bazel targets
in the `WORKSPACE` file:
nix_import_fetch_builtin(
name = "mytarball",
nix_file = "mytarball.nix",
)
And have targets like:
@mytarball//:file1
@mytarball//:dir/file2
Requires `nix eval` (nix 2.0 or later), because `nix-instantiate` is
not able to print raw strings, but it should be possible to use
`nix-instantiate --eval` by unescaping the resulting string manually.
|
Closing because @regnat pointed me to the fact that you can use a nix expression like: nixpkgs.nix directly inside the The |
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This allows users to import their
fetchTarball/fetchGitexpressions as bazel repositories to have one central “source of truth” for e.g. which fixed version of nixpkgs to import.See the second commit for further explanations (the first commit is just trivial preparation).