Function install_environment

pre_commit/languages/julia.py:64–133

(
        prefix: Prefix,
        version: str,
        additional_dependencies: Sequence[str],
)

def install_environment(
        prefix: Prefix,
        version: str,
        additional_dependencies: Sequence[str],
) -> None:
    envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
    with in_env(prefix, version):
        # TODO: Support language_version with juliaup similar to rust via
        # rustup
        # if version != 'system':
        #     ...

        # Copy Project.toml to hook env if it exist
        os.makedirs(envdir, exist_ok=True)
        project_names = ('JuliaProject.toml', 'Project.toml')
        project_found = False
        for project_name in project_names:
            project_file = prefix.path(project_name)
            if not os.path.isfile(project_file):
                continue
            shutil.copy(project_file, envdir)
            project_found = True
            break

        # If no project file was found we create an empty one so that the
        # package manager doesn't error
        if not project_found:
            open(os.path.join(envdir, 'Project.toml'), 'a').close()

        # Copy Manifest.toml to hook env if it exists
        manifest_names = ('JuliaManifest.toml', 'Manifest.toml')
        for manifest_name in manifest_names:
            manifest_file = prefix.path(manifest_name)
            if not os.path.isfile(manifest_file):
                continue
            shutil.copy(manifest_file, envdir)
            break

        # Julia code to instantiate the hook environment
        julia_code = """
        @assert length(ARGS) > 0
        hook_env = ARGS[1]
        deps = join(ARGS[2:end], " ")

        # We prepend @stdlib here so that we can load the package manager even
        # though `get_env_patch` limits `JULIA_LOAD_PATH` to just the hook env.
        pushfirst!(LOAD_PATH, "@stdlib")
        using Pkg
        popfirst!(LOAD_PATH)

        # Instantiate the environment shipped with the hook repo. If we have
        # additional dependencies we disable precompilation in this step to
        # avoid double work.
        precompile = isempty(deps) ? "1" : "0"
        withenv("JULIA_PKG_PRECOMPILE_AUTO" => precompile) do
            Pkg.instantiate()
        end