build/RunCbindgen.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this
   3 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
   4
   5 import os
   6 import subprocess
   7
   8 import buildconfig
   9 import mozpack.path as mozpath
  10 import six
  11 import toml
  12
  13
  14 # Try to read the package name or otherwise assume same name as the crate path.
  15 def _get_crate_name(crate_path):
  16     try:
  17         with open(mozpath.join(crate_path, "Cargo.toml"), encoding="utf-8") as f:
  18             return toml.load(f)["package"]["name"]
  19     except Exception:
  20         return mozpath.basename(crate_path)
  21
  22
  23 CARGO_LOCK = mozpath.join(buildconfig.topsrcdir, "Cargo.lock")
  24 CARGO_TOML = mozpath.join(buildconfig.topsrcdir, "Cargo.toml")
  25
  26
  27 def _run_process(args):
  28     env = os.environ.copy()
  29     env["CARGO"] = str(buildconfig.substs["CARGO"])
  30     env["RUSTC"] = str(buildconfig.substs["RUSTC"])
  31
  32     p = subprocess.Popen(args, env=env, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  33
  34     stdout, stderr = p.communicate()
  35     stdout = six.ensure_text(stdout)
  36     stderr = six.ensure_text(stderr)
  37     if p.returncode != 0:
  38         print(stdout)
  39         print(stderr)
  40     return (stdout, p.returncode)
  41
  42
  43 def generate_metadata(output, cargo_config):
  44     stdout, returncode = _run_process(
  45         [
  46             buildconfig.substs["CARGO"],
  47             "metadata",
  48             "--frozen",
  49             "--all-features",
  50             "--format-version",
  51             "1",
  52             "--manifest-path",
  53             CARGO_TOML,
  54         ]
  55     )
  56
  57     if returncode != 0:
  58         return returncode
  59
  60     output.write(stdout)
  61
  62     # This is not quite accurate, but cbindgen only cares about a subset of the
  63     # data which, when changed, causes these files to change.
  64     return set([CARGO_LOCK, CARGO_TOML])
  65
  66
  67 def generate(output, metadata_path, cbindgen_crate_path, *in_tree_dependencies):
  68     stdout, returncode = _run_process(
  69         [
  70             buildconfig.substs["CBINDGEN"],
  71             buildconfig.topsrcdir,
  72             "--lockfile",
  73             CARGO_LOCK,
  74             "--crate",
  75             _get_crate_name(cbindgen_crate_path),
  76             "--metadata",
  77             metadata_path,
  78             "--cpp-compat",
  79         ]
  80     )
  81
  82     if returncode != 0:
  83         return returncode
  84
  85     output.write(stdout)
  86
  87     deps = set()
  88     deps.add(CARGO_LOCK)
  89     deps.add(mozpath.join(cbindgen_crate_path, "cbindgen.toml"))
  90     for directory in in_tree_dependencies + (cbindgen_crate_path,):
  91         for path, dirs, files in os.walk(directory):
  92             for file in files:
  93                 if os.path.splitext(file)[1] == ".rs":
  94                     deps.add(mozpath.join(path, file))
  95
  96     return deps