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John Doty 2024-03-08 11:03:01 -08:00
parent 5deceec006
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{"files":{"Cargo.toml":"f7861a9fdbed65ce6969d3baa0ebf300c01723d4c2f79bc30f49aad2d1b2445b","LICENSE-APACHE":"8ada45cd9f843acf64e4722ae262c622a2b3b3007c7310ef36ac1061a30f6adb","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","README.md":"132d9e72011322528376c46965004ffb3d1be30841eb6ff5683a4a75deb35b37","src/env.rs":"de5ce25abee28dca6dc4af52257ed6dc230c2a09c587a361a2dda2ffec8f2bd9","src/lib.rs":"f986d439da63d1597057be177b7ffde982c3081b5ed967f0dcaed99d3490a0b2","src/windows.rs":"bfc979fb1db4bea3a13b5a9e987c8a0f19cfdf88aa1e66576a357394eefa26bd"},"package":"e3d1354bf6b7235cb4a0576c2619fd4ed18183f689b12b006a0ee7329eeff9a5"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.70.0"
name = "home"
version = "0.5.9"
authors = ["Brian Anderson <andersrb@gmail.com>"]
include = [
"/src",
"/Cargo.toml",
"/CHANGELOG",
"/LICENSE-*",
"/README.md",
]
description = "Shared definitions of home directories."
documentation = "https://docs.rs/home"
readme = "README.md"
license = "MIT OR Apache-2.0"
repository = "https://github.com/rust-lang/cargo"
[target."cfg(windows)".dependencies.windows-sys]
version = "0.52"
features = [
"Win32_Foundation",
"Win32_UI_Shell",
"Win32_System_Com",
]
[lints.clippy]
dbg_macro = "warn"
disallowed_methods = "warn"
print_stderr = "warn"
print_stdout = "warn"
self_named_module_files = "warn"
[lints.clippy.all]
level = "allow"
priority = -1
[lints.rust]
rust_2018_idioms = "warn"
[lints.rustdoc]
private_intra_doc_links = "allow"

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Permission is hereby granted, free of charge, to any
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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DEALINGS IN THE SOFTWARE.

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[![Documentation](https://docs.rs/home/badge.svg)](https://docs.rs/home)
[![crates.io](https://img.shields.io/crates/v/home.svg)](https://crates.io/crates/home)
Canonical definitions of `home_dir`, `cargo_home`, and `rustup_home`.
This provides the definition of `home_dir` used by Cargo and rustup,
as well functions to find the correct value of `CARGO_HOME` and
`RUSTUP_HOME`.
The definition of `home_dir` provided by the standard library is
incorrect because it considers the `HOME` environment variable on
Windows. This causes surprising situations where a Rust program will
behave differently depending on whether it is run under a Unix
emulation environment like Cygwin or MinGW. Neither Cargo nor rustup
use the standard library's definition - they use the definition here.
This crate further provides two functions, `cargo_home` and
`rustup_home`, which are the canonical way to determine the location
that Cargo and rustup store their data.
See [rust-lang/rust#43321].
[rust-lang/rust#43321]: https://github.com/rust-lang/rust/issues/43321
## License
MIT OR Apache-2.0

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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 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")),
}
}

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//! Canonical definitions of `home_dir`, `cargo_home`, and `rustup_home`.
//!
//! The definition of `home_dir` provided by the standard library is
//! incorrect because it considers the `HOME` environment variable on
//! Windows. This causes surprising situations where a Rust program
//! will behave differently depending on whether it is run under a
//! Unix emulation environment like Cygwin or MinGW. Neither Cargo nor
//! rustup use the standard libraries definition - they use the
//! definition here.
//!
//! This crate provides two additional functions, `cargo_home` and
//! `rustup_home`, which are the canonical way to determine the
//! location that Cargo and rustup use to store their data.
//! The `env` module contains utilities for mocking the process environment
//! by Cargo and rustup.
//!
//! See also this [discussion].
//!
//! [discussion]: https://github.com/rust-lang/rust/pull/46799#issuecomment-361156935
#![allow(clippy::disallowed_methods)]
pub mod env;
#[cfg(target_os = "windows")]
mod windows;
use std::io;
use std::path::{Path, PathBuf};
/// Returns the path of the current user's home directory using environment
/// variables or OS-specific APIs.
///
/// # Unix
///
/// Returns the value of the `HOME` environment variable if it is set
/// **even** if it is an empty string. Otherwise, it tries to determine the
/// home directory by invoking the [`getpwuid_r`][getpwuid] function with
/// the UID of the current user.
///
/// [getpwuid]: https://linux.die.net/man/3/getpwuid_r
///
/// # Windows
///
/// Returns the value of the `USERPROFILE` environment variable if it is set
/// **and** it is not an empty string. Otherwise, it tries to determine the
/// home directory by invoking the [`SHGetKnownFolderPath`][shgkfp] function with
/// [`FOLDERID_Profile`][knownfolderid].
///
/// [shgkfp]: https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/nf-shlobj_core-shgetknownfolderpath
/// [knownfolderid]: https://learn.microsoft.com/en-us/windows/win32/shell/knownfolderid
///
/// # Examples
///
/// ```
/// match home::home_dir() {
/// Some(path) if !path.as_os_str().is_empty() => println!("{}", path.display()),
/// _ => println!("Unable to get your home dir!"),
/// }
/// ```
pub fn home_dir() -> Option<PathBuf> {
env::home_dir_with_env(&env::OS_ENV)
}
#[cfg(windows)]
use windows::home_dir_inner;
#[cfg(any(unix, target_os = "redox"))]
fn home_dir_inner() -> Option<PathBuf> {
#[allow(deprecated)]
std::env::home_dir()
}
/// Returns the storage directory used by Cargo, often knowns as
/// `.cargo` or `CARGO_HOME`.
///
/// It returns one of the following values, in this order of
/// preference:
///
/// - The value of the `CARGO_HOME` environment variable, if it is
/// an absolute path.
/// - The value of the current working directory joined with the value
/// of the `CARGO_HOME` environment variable, if `CARGO_HOME` is a
/// relative directory.
/// - The `.cargo` directory in the user's home directory, as reported
/// by the `home_dir` function.
///
/// # Errors
///
/// This function fails if it fails to retrieve the current directory,
/// or if the home directory cannot be determined.
///
/// # Examples
///
/// ```
/// match home::cargo_home() {
/// Ok(path) => println!("{}", path.display()),
/// Err(err) => eprintln!("Cannot get your cargo home dir: {:?}", err),
/// }
/// ```
pub fn cargo_home() -> io::Result<PathBuf> {
env::cargo_home_with_env(&env::OS_ENV)
}
/// Returns the storage directory used by Cargo within `cwd`.
/// For more details, see [`cargo_home`](fn.cargo_home.html).
pub fn cargo_home_with_cwd(cwd: &Path) -> io::Result<PathBuf> {
env::cargo_home_with_cwd_env(&env::OS_ENV, cwd)
}
/// Returns the storage directory used by rustup, often knowns as
/// `.rustup` or `RUSTUP_HOME`.
///
/// It returns one of the following values, in this order of
/// preference:
///
/// - The value of the `RUSTUP_HOME` environment variable, if it is
/// an absolute path.
/// - The value of the current working directory joined with the value
/// of the `RUSTUP_HOME` environment variable, if `RUSTUP_HOME` is a
/// relative directory.
/// - The `.rustup` directory in the user's home directory, as reported
/// by the `home_dir` function.
///
/// # Errors
///
/// This function fails if it fails to retrieve the current directory,
/// or if the home directory cannot be determined.
///
/// # Examples
///
/// ```
/// match home::rustup_home() {
/// Ok(path) => println!("{}", path.display()),
/// Err(err) => eprintln!("Cannot get your rustup home dir: {:?}", err),
/// }
/// ```
pub fn rustup_home() -> io::Result<PathBuf> {
env::rustup_home_with_env(&env::OS_ENV)
}
/// Returns the storage directory used by rustup within `cwd`.
/// For more details, see [`rustup_home`](fn.rustup_home.html).
pub fn rustup_home_with_cwd(cwd: &Path) -> io::Result<PathBuf> {
env::rustup_home_with_cwd_env(&env::OS_ENV, cwd)
}

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use std::env;
use std::ffi::OsString;
use std::os::windows::ffi::OsStringExt;
use std::path::PathBuf;
use std::ptr;
use std::slice;
use windows_sys::Win32::Foundation::S_OK;
use windows_sys::Win32::System::Com::CoTaskMemFree;
use windows_sys::Win32::UI::Shell::{FOLDERID_Profile, SHGetKnownFolderPath, KF_FLAG_DONT_VERIFY};
pub fn home_dir_inner() -> Option<PathBuf> {
env::var_os("USERPROFILE")
.filter(|s| !s.is_empty())
.map(PathBuf::from)
.or_else(home_dir_crt)
}
#[cfg(not(target_vendor = "uwp"))]
fn home_dir_crt() -> Option<PathBuf> {
unsafe {
let mut path = ptr::null_mut();
match SHGetKnownFolderPath(&FOLDERID_Profile, KF_FLAG_DONT_VERIFY as u32, 0, &mut path) {
S_OK => {
let path_slice = slice::from_raw_parts(path, wcslen(path));
let s = OsString::from_wide(&path_slice);
CoTaskMemFree(path.cast());
Some(PathBuf::from(s))
}
_ => {
// Free any allocated memory even on failure. A null ptr is a no-op for `CoTaskMemFree`.
CoTaskMemFree(path.cast());
None
}
}
}
}
#[cfg(target_vendor = "uwp")]
fn home_dir_crt() -> Option<PathBuf> {
None
}
extern "C" {
fn wcslen(buf: *const u16) -> usize;
}
#[cfg(not(target_vendor = "uwp"))]
#[cfg(test)]
mod tests {
use super::home_dir_inner;
use std::env;
use std::ops::Deref;
use std::path::{Path, PathBuf};
#[test]
fn test_with_without() {
let olduserprofile = env::var_os("USERPROFILE").unwrap();
env::remove_var("HOME");
env::remove_var("USERPROFILE");
assert_eq!(home_dir_inner(), Some(PathBuf::from(olduserprofile)));
let home = Path::new(r"C:\Users\foo tar baz");
env::set_var("HOME", home.as_os_str());
assert_ne!(home_dir_inner().as_ref().map(Deref::deref), Some(home));
env::set_var("USERPROFILE", home.as_os_str());
assert_eq!(home_dir_inner().as_ref().map(Deref::deref), Some(home));
}
}