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 from __future__ import print_function
   6 import buildconfig
   7 import mozpack.path as mozpath
   8 import os
   9 import six
  10 import subprocess
  11 import pytoml
  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")) as f:
  18             return pytoml.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         buildconfig.substs['CARGO'],
  46         "metadata",
  47         "--all-features",
  48         "--format-version",
  49         "1",
  50         "--manifest-path",
  51         CARGO_TOML
  52     ])
  53
  54     if returncode != 0:
  55         return returncode
  56
  57     output.write(stdout)
  58
  59     # This is not quite accurate, but cbindgen only cares about a subset of the
  60     # data which, when changed, causes these files to change.
  61     return set([CARGO_LOCK, CARGO_TOML])
  62
  63
  64 def generate(output, metadata_path, cbindgen_crate_path, *in_tree_dependencies):
  65     stdout, returncode = _run_process([
  66         buildconfig.substs['CBINDGEN'],
  67         buildconfig.topsrcdir,
  68         "--lockfile",
  69         CARGO_LOCK,
  70         "--crate",
  71         _get_crate_name(cbindgen_crate_path),
  72         "--metadata",
  73         metadata_path,
  74         "--cpp-compat"
  75     ])
  76
  77     if returncode != 0:
  78         return returncode
  79
  80     output.write(stdout)
  81
  82     deps = set()
  83     deps.add(CARGO_LOCK)
  84     deps.add(mozpath.join(cbindgen_crate_path, "cbindgen.toml"))
  85     for directory in in_tree_dependencies + (cbindgen_crate_path,):
  86         for path, dirs, files in os.walk(directory):
  87             for file in files:
  88                 if os.path.splitext(file)[1] == ".rs":
  89                     deps.add(mozpath.join(path, file))
  90
  91     return deps