| """Utilities for `rules_python` pip rules""" |
| |
| _SRCS_TEMPLATE = """\ |
| \"\"\"A generate file containing all source files used for `@rules_python//python/pip_install:pip_repository.bzl` rules |
| |
| This file is auto-generated from the `@rules_python//python/pip_install/private:srcs_module.install` target. Please |
| `bazel run` this target to apply any updates. Note that doing so will discard any local modifications. |
| "\"\" |
| |
| # Each source file is tracked as a target so `pip_repository` rules will know to automatically rebuild if any of the |
| # sources changed. |
| PIP_INSTALL_PY_SRCS = [ |
| {srcs} |
| ] |
| """ |
| |
| def _src_label(file): |
| dir_path, file_name = file.short_path.rsplit("/", 1) |
| |
| return "@rules_python//{}:{}".format( |
| dir_path, |
| file_name, |
| ) |
| |
| def _srcs_module_impl(ctx): |
| srcs = [_src_label(src) for src in ctx.files.srcs] |
| if not srcs: |
| fail("`srcs` cannot be empty") |
| output = ctx.actions.declare_file(ctx.label.name) |
| |
| ctx.actions.write( |
| output = output, |
| content = _SRCS_TEMPLATE.format( |
| srcs = "\n ".join(["\"{}\",".format(src) for src in srcs]), |
| ), |
| ) |
| |
| return DefaultInfo( |
| files = depset([output]), |
| ) |
| |
| _srcs_module = rule( |
| doc = "A rule for writing a list of sources to a templated file", |
| implementation = _srcs_module_impl, |
| attrs = { |
| "srcs": attr.label( |
| doc = "A filegroup of source files", |
| allow_files = True, |
| ), |
| }, |
| ) |
| |
| _INSTALLER_TEMPLATE = """\ |
| #!/bin/bash |
| set -euo pipefail |
| cp -f "{path}" "${{BUILD_WORKSPACE_DIRECTORY}}/{dest}" |
| """ |
| |
| def _srcs_updater_impl(ctx): |
| output = ctx.actions.declare_file(ctx.label.name + ".sh") |
| target_file = ctx.file.input |
| dest = ctx.file.dest.short_path |
| |
| ctx.actions.write( |
| output = output, |
| content = _INSTALLER_TEMPLATE.format( |
| path = target_file.short_path, |
| dest = dest, |
| ), |
| is_executable = True, |
| ) |
| |
| return DefaultInfo( |
| files = depset([output]), |
| runfiles = ctx.runfiles(files = [target_file]), |
| executable = output, |
| ) |
| |
| _srcs_updater = rule( |
| doc = "A rule for writing a `srcs.bzl` file back to the repository", |
| implementation = _srcs_updater_impl, |
| attrs = { |
| "dest": attr.label( |
| doc = "The target file to write the new `input` to.", |
| allow_single_file = ["srcs.bzl"], |
| mandatory = True, |
| ), |
| "input": attr.label( |
| doc = "The file to write back to the repository", |
| allow_single_file = True, |
| mandatory = True, |
| ), |
| }, |
| executable = True, |
| ) |
| |
| def srcs_module(name, dest, **kwargs): |
| """A helper rule to ensure `pip_repository` rules are always up to date |
| |
| Args: |
| name (str): The name of the sources module |
| dest (str): The filename the module should be written as in the current package. |
| **kwargs (dict): Additional keyword arguments |
| """ |
| tags = kwargs.pop("tags", []) |
| |
| _srcs_module( |
| name = name, |
| tags = tags, |
| **kwargs |
| ) |
| |
| _srcs_updater( |
| name = name + ".update", |
| input = name, |
| dest = dest, |
| tags = tags, |
| ) |