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rust.py
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rust.py
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import contextlib
import os.path
from typing import Generator
from typing import Sequence
from typing import Set
from typing import Tuple
import toml
import pre_commit.constants as C
from pre_commit.envcontext import envcontext
from pre_commit.envcontext import PatchesT
from pre_commit.envcontext import Var
from pre_commit.hook import Hook
from pre_commit.languages import helpers
from pre_commit.prefix import Prefix
from pre_commit.util import clean_path_on_failure
from pre_commit.util import cmd_output_b
ENVIRONMENT_DIR = 'rustenv'
RUNTIME_DIR = 'rustup'
get_default_version = helpers.basic_get_default_version
def _envdir(prefix: Prefix, version: str) -> str:
directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
return prefix.path(directory)
def _version_flag(version: str) -> Sequence[str]:
return [] if version == C.DEFAULT else [f'+{version}']
def _resolve_version(prefix: Prefix, version: str) -> str:
if version != C.DEFAULT:
return version
if prefix.exists('rust-toolchain'):
with open(prefix.path('rust-toolchain')) as f:
return f.readline().strip()
return version
def get_env_patch(prefix: Prefix, version: str) -> PatchesT:
env_path = _envdir(prefix, version)
patch = (
('CARGO_HOME', env_path),
('PATH', (os.path.join(env_path, 'bin'), os.pathsep, Var('PATH'))),
)
if version != C.DEFAULT:
return (*patch, ('RUSTUP_HOME', prefix.path(RUNTIME_DIR)))
return patch
@contextlib.contextmanager
def in_env(prefix: Prefix, version: str) -> Generator[None, None, None]:
with envcontext(get_env_patch(prefix, version)):
yield
def healthy(prefix: Prefix, version: str) -> bool:
language_version = _resolve_version(prefix, version)
with in_env(prefix, language_version):
version_flag = _version_flag(language_version)
retcode, _, _ = cmd_output_b(
'rustc', *version_flag, '--version',
retcode=None,
cwd=prefix.prefix_dir,
)
return retcode == 0
def _add_dependencies(
cargo_toml_path: str,
additional_dependencies: Set[str],
) -> None:
with open(cargo_toml_path, 'r+') as f:
cargo_toml = toml.load(f)
cargo_toml.setdefault('dependencies', {})
for dep in additional_dependencies:
name, _, spec = dep.partition(':')
cargo_toml['dependencies'][name] = spec or '*'
f.seek(0)
toml.dump(cargo_toml, f)
f.truncate()
def install_environment(
prefix: Prefix,
version: str,
additional_dependencies: Sequence[str],
) -> None:
# There are two cases where we might want to specify more dependencies:
# as dependencies for the library being built, and as binary packages
# to be `cargo install`'d.
#
# Unlike e.g. Python, if we just `cargo install` a library, it won't be
# used for compilation. And if we add a crate providing a binary to the
# `Cargo.toml`, the binary won't be built.
#
# Because of this, we allow specifying "cli" dependencies by prefixing
# with 'cli:'.
cli_deps = {
dep for dep in additional_dependencies if dep.startswith('cli:')
}
lib_deps = set(additional_dependencies) - cli_deps
if len(lib_deps) > 0:
_add_dependencies(prefix.path('Cargo.toml'), lib_deps)
language_version = _resolve_version(prefix, version)
directory = _envdir(prefix, language_version)
with clean_path_on_failure(directory), in_env(prefix, language_version):
if language_version != C.DEFAULT:
cmd_output_b(
'rustup', 'toolchain', 'install',
'--no-self-update', '--profile', 'minimal', language_version,
cwd=prefix.prefix_dir,
)
packages_to_install: Set[Tuple[str, ...]] = {('--path', '.')}
for cli_dep in cli_deps:
cli_dep = cli_dep[len('cli:'):]
package, _, dep_version = cli_dep.partition(':')
if dep_version != '':
packages_to_install.add((package, '--version', dep_version))
else:
packages_to_install.add((package,))
version_flag = _version_flag(language_version)
for args in packages_to_install:
cmd_output_b(
'cargo', *version_flag, 'install', '--bins', *args,
cwd=prefix.prefix_dir,
)
def run_hook(
hook: Hook,
file_args: Sequence[str],
color: bool,
) -> Tuple[int, bytes]:
language_version = _resolve_version(hook.prefix, hook.language_version)
with in_env(hook.prefix, language_version):
return helpers.run_xargs(hook, hook.cmd, file_args, color=color)