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|
//! Lower-level utilities for mocking the process environment.
use std::{
ffi::OsString,
io,
path::{Path, PathBuf},
};
/// Permits parameterizing the home functions via the _from variants - used for
/// in-process unit testing by rustup.
pub trait Env {
/// Return the path to the the users home dir, or None if any error occurs:
/// see home_inner.
fn home_dir(&self) -> Option<PathBuf>;
/// Return the current working directory.
fn current_dir(&self) -> io::Result<PathBuf>;
/// Get an environment variable, as per std::env::var_os.
fn var_os(&self, key: &str) -> Option<OsString>;
}
/// Implements Env for the OS context, both Unix style and Windows.
///
/// This is trait permits in-process testing by providing a control point to
/// allow in-process divergence on what is normally process wide state.
///
/// Implementations should be provided by whatever testing framework the caller
/// is using. Code that is not performing in-process threaded testing requiring
/// isolated rustup/cargo directories does not need this trait or the _from
/// functions.
pub struct OsEnv;
impl Env for OsEnv {
fn home_dir(&self) -> Option<PathBuf> {
crate::home_dir_inner()
}
fn current_dir(&self) -> io::Result<PathBuf> {
std::env::current_dir()
}
fn var_os(&self, key: &str) -> Option<OsString> {
std::env::var_os(key)
}
}
pub const OS_ENV: OsEnv = OsEnv {};
/// Returns the path of the current user's home directory from [`Env::home_dir`].
pub fn home_dir_with_env(env: &dyn Env) -> Option<PathBuf> {
env.home_dir()
}
/// Variant of cargo_home where the environment source is parameterized. This is
/// specifically to support in-process testing scenarios as environment
/// variables and user home metadata are normally process global state. See the
/// [`Env`] trait.
pub fn cargo_home_with_env(env: &dyn Env) -> io::Result<PathBuf> {
let cwd = env.current_dir()?;
cargo_home_with_cwd_env(env, &cwd)
}
/// Variant of cargo_home_with_cwd where the environment source is
/// parameterized. This is specifically to support in-process testing scenarios
/// as environment variables and user home metadata are normally process global
/// state. See the OsEnv trait.
pub fn cargo_home_with_cwd_env(env: &dyn Env, cwd: &Path) -> io::Result<PathBuf> {
match env.var_os("CARGO_HOME").filter(|h| !h.is_empty()) {
Some(home) => {
let home = PathBuf::from(home);
if home.is_absolute() {
Ok(home)
} else {
Ok(cwd.join(&home))
}
}
_ => home_dir_with_env(env)
.map(|p| p.join(".cargo"))
.ok_or_else(|| io::Error::new(io::ErrorKind::Other, "could not find cargo home dir")),
}
}
/// Variant of cargo_home_with_cwd where the environment source is
/// parameterized. This is specifically to support in-process testing scenarios
/// as environment variables and user home metadata are normally process global
/// state. See the OsEnv trait.
pub fn rustup_home_with_env(env: &dyn Env) -> io::Result<PathBuf> {
let cwd = env.current_dir()?;
rustup_home_with_cwd_env(env, &cwd)
}
/// Variant of cargo_home_with_cwd where the environment source is
/// parameterized. This is specifically to support in-process testing scenarios
/// as environment variables and user home metadata are normally process global
/// state. See the OsEnv trait.
pub fn rustup_home_with_cwd_env(env: &dyn Env, cwd: &Path) -> io::Result<PathBuf> {
match env.var_os("RUSTUP_HOME").filter(|h| !h.is_empty()) {
Some(home) => {
let home = PathBuf::from(home);
if home.is_absolute() {
Ok(home)
} else {
Ok(cwd.join(&home))
}
}
_ => home_dir_with_env(env)
.map(|d| d.join(".rustup"))
.ok_or_else(|| io::Error::new(io::ErrorKind::Other, "could not find rustup home dir")),
}
}
|
