| #!/usr/bin/env python2.7 |
| # |
| # Copyright 2020 The Fuchsia Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import os |
| import argparse |
| import hashlib |
| import shutil |
| import re |
| import sys |
| import json |
| import datetime |
| |
| ROOT_PATH = os.path.abspath(__file__ + "/../..") |
| sys.path += [os.path.join(ROOT_PATH, "third_party", "pytoml")] |
| import pytoml as toml |
| |
| CARGO_PACKAGE_CONTENTS = """\ |
| # Copyright %(year)s The Fuchsia Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| # source GN: %(target)s" |
| |
| [package] |
| name = "%(package_name)s" |
| version = "%(version)s" |
| license = "BSD-3-Clause" |
| authors = ["rust-fuchsia@fuchsia.com"] |
| description = "Rust crate for Fuchsia OS" |
| repository = "https://fuchsia.googlesource.com" |
| edition = "%(edition)s" |
| |
| %(bin_or_lib)s |
| %(is_proc_macro)s |
| name = "%(crate_name)s" |
| path = "%(source_root)s" |
| """ |
| |
| CARGO_PACKAGE_DEP = """\ |
| [dependencies.%(crate_name)s] |
| version = "0.0.1" |
| path = "%(crate_path)s" |
| |
| """ |
| |
| |
| def strip_toolchain(target): |
| return re.search("[^(]*", target)[0] |
| |
| |
| def lookup_gn_pkg_name(project, target): |
| metadata = project.targets[target] |
| return metadata["output_name"] |
| |
| |
| def rebase_gn_path(root_path, location, directory=False): |
| assert location[0:2] == "//" |
| # remove the prefix // |
| path = location[2:] |
| target = os.path.dirname(path) if directory else path |
| return os.path.join(root_path, target) |
| |
| class FeatureSpec(object): |
| |
| def __init__(self, features, default_features): |
| self.features = features |
| self.default_features = default_features |
| |
| |
| class Project(object): |
| |
| def __init__(self, project_json): |
| self.targets = project_json["targets"] |
| self.build_settings = project_json["build_settings"] |
| self.patches = None |
| self.third_party_features = {} |
| |
| def rust_targets(self): |
| for target in self.targets.keys(): |
| if "crate_root" in self.targets[target]: |
| yield target |
| |
| def dereference_group(self, target): |
| """Dereference proc macro shims. |
| |
| If the target happens to be a group which just redirects you to a |
| different target, returns the real target label. Otherwise, returns |
| target. |
| """ |
| meta = self.targets[target] |
| if meta["type"] == "group": |
| if len(meta["deps"]) == 1: |
| dep = meta["deps"][0] |
| dep_meta = self.targets[dep] |
| return dep |
| return target |
| |
| |
| def write_toml_file(fout, metadata, project, target, lookup): |
| root_path = project.build_settings["root_path"] |
| rust_crates_path = os.path.join(root_path, "third_party/rust_crates") |
| |
| edition = "2018" if "--edition=2018" in metadata["rustflags"] else "2015" |
| |
| if metadata["type"] in ["rust_library", "rust_proc_macro", |
| "static_library"]: |
| target_type = "[lib]" |
| else: |
| if "--test" in metadata["rustflags"]: |
| target_type = "[[test]]" |
| else: |
| target_type = "[[bin]]" |
| |
| if metadata["type"] == "rust_proc_macro": |
| is_proc_macro = "proc-macro = true" |
| else: |
| is_proc_macro = "" |
| |
| features = [] |
| feature_pat = re.compile(r"--cfg=feature=\"(.*)\"$") |
| for flag in metadata["rustflags"]: |
| match = feature_pat.match(flag) |
| if match: |
| features.append(match.group(1)) |
| |
| crate_type = "rlib" |
| package_name = lookup_gn_pkg_name(project, target) |
| |
| fout.write( |
| CARGO_PACKAGE_CONTENTS % { |
| "target": target, |
| "package_name": package_name, |
| "crate_name": metadata["crate_name"], |
| "version": "0.0.1", |
| "year": datetime.datetime.now().year, |
| "bin_or_lib": target_type, |
| "is_proc_macro": is_proc_macro, |
| "lib_crate_type": crate_type, |
| "edition": edition, |
| "source_root": rebase_gn_path(root_path, metadata["crate_root"]), |
| "crate_name": metadata["crate_name"], |
| "rust_crates_path": rust_crates_path, |
| }) |
| |
| if features: |
| fout.write("\n[features]\n") |
| # Filter 'default' feature out to avoid generating a duplicated entry. |
| features = filter(lambda x: x != "default", features) |
| fout.write("default = %s\n" % json.dumps(features)) |
| for feature in features: |
| fout.write("%s = []\n" % feature) |
| |
| fout.write("\n[patch.crates-io]\n") |
| for patch in project.patches: |
| path = project.patches[patch]["path"] |
| fout.write( |
| "%s = { path = \"%s/%s\" }\n" % (patch, rust_crates_path, path)) |
| fout.write("\n") |
| |
| # collect all dependencies |
| deps = [] |
| for dep in metadata["deps"]: |
| # handle proc macro shims: |
| dep = project.dereference_group(dep) |
| # this is a third-party dependency |
| # TODO remove this when all things use GN. temporary hack? |
| if "third_party/rust_crates:" in dep: |
| has_third_party_deps = True |
| match = re.search("rust_crates:([\w-]*)", dep) |
| crate_name, version = str(match.group(1)).rsplit("-v", 1) |
| version = version.replace("_", ".") |
| feature_spec = project.third_party_features.get(crate_name) |
| fout.write("[dependencies.\"%s\"]\n" % crate_name) |
| fout.write("version = \"%s\"\n" % version) |
| if feature_spec: |
| fout.write("features = %s\n" % json.dumps(feature_spec.features)) |
| if feature_spec.default_features is False: |
| fout.write("default-features = false\n") |
| # this is a in-tree rust target |
| elif "crate_name" in project.targets[dep]: |
| crate_name = lookup_gn_pkg_name(project, dep) |
| output_name = project.targets[dep]["crate_name"] |
| dep_dir = rebase_gn_path( |
| root_path, project.build_settings["build_dir"] + "cargo/" + |
| str(lookup[dep])) |
| fout.write( |
| CARGO_PACKAGE_DEP % { |
| "crate_path": dep_dir, |
| "crate_name": crate_name, |
| }) |
| |
| def main(): |
| # TODO(tmandry): Remove all hardcoded paths and replace with args. |
| parser = argparse.ArgumentParser() |
| parser.add_argument("json_path") |
| args = parser.parse_args() |
| json_path = args.json_path |
| |
| project = None |
| try: |
| with open(json_path, "r") as json_file: |
| project = json.loads(json_file.read()) |
| except IOError: |
| print("Failed to generate Cargo.toml files") |
| print("No project.json in the root of your out directory!") |
| print("Run gn with the --ide=json flag set") |
| # returns 0 so that CQ doesn"t fail if this isn"t set properly |
| return 0 |
| |
| project = Project(project) |
| root_path = project.build_settings["root_path"] |
| build_dir = project.build_settings["build_dir"] |
| |
| rust_crates_path = os.path.join(root_path, "third_party/rust_crates") |
| |
| # this will be removed eventually? |
| with open(rust_crates_path + "/Cargo.toml", "r") as f: |
| cargo_toml = toml.load(f) |
| project.patches = cargo_toml["patch"]["crates-io"] |
| |
| # Map from crate name to FeatureSpec. We don't include the version because we don't directly |
| # depend on more than one version of the same crate. |
| def collect_features(deps): |
| for dep, info in deps.iteritems(): |
| if isinstance(info, str) or isinstance(info, unicode): |
| continue |
| project.third_party_features[dep] = FeatureSpec( |
| info.get("features", []), |
| info.get("default-features", True)) |
| collect_features(cargo_toml["dependencies"]) |
| for target_info in cargo_toml["target"].itervalues(): |
| collect_features(target_info.get("dependencies", {})) |
| |
| host_binaries = [] |
| target_binaries = [] |
| |
| lookup = {} |
| for idx, target in enumerate(project.rust_targets()): |
| # hash is the GN target name without the prefixed // |
| lookup[target] = hashlib.sha1(target[2:].encode("utf-8")).hexdigest() |
| |
| # remove the priorly generated rust crates |
| gn_cargo_dir = rebase_gn_path( |
| root_path, project.build_settings["build_dir"] + "cargo/") |
| shutil.rmtree(gn_cargo_dir, ignore_errors=True) |
| os.makedirs(gn_cargo_dir) |
| # Write a stamp file with a predictable name so the build system knows the |
| # step ran successfully. |
| with open(os.path.join(gn_cargo_dir, "gn_to_cargo.stamp"), "w") as f: |
| f.truncate() |
| # And a depfile so GN knows to run this script again when the json file |
| # changes. Dependencies on the third-party build are tracked within GN. |
| with open(os.path.join(gn_cargo_dir, "gn_to_cargo.stamp.d"), "w") as f: |
| f.write("cargo/gn_to_cargo.stamp: %s\n" % json_path) |
| |
| for target in project.rust_targets(): |
| cargo_toml_dir = rebase_gn_path( |
| root_path, project.build_settings["build_dir"] + "cargo/" + |
| str(lookup[target])) |
| try: |
| os.makedirs(cargo_toml_dir) |
| except OSError: |
| print("Failed to create directory for Cargo: %s" % cargo_toml_dir) |
| |
| metadata = project.targets[target] |
| with open(cargo_toml_dir + "/Cargo.toml", "w") as fout: |
| write_toml_file(fout, metadata, project, target, lookup) |
| return 0 |
| |
| |
| if __name__ == "__main__": |
| sys.exit(main()) |
