Struct EnvVarGuard 

pub struct EnvVarGuard { /* private fields */ }

Guard that temporarily sets an environment variable and restores the previous value on drop.

This guard is useful for testing or temporarily modifying environment variables in a controlled manner. When the guard is dropped, it automatically restores the environment variable to its previous state (or removes it if it didn’t exist before).

Safety

This struct uses unsafe blocks to modify environment variables, which is necessary because Rust’s standard library marks env::set_var and env::remove_var as unsafe due to their potential for data races in multi-threaded contexts. The guard ensures that modifications are properly cleaned up.

Examples

use xet_runtime::utils::EnvVarGuard;

// Temporarily set an environment variable
let _guard = EnvVarGuard::set("MY_VAR", "test_value");
// Environment variable is set here
// When _guard is dropped, the previous value (or absence) is restored

Implementations

impl EnvVarGuard

pub fn set(key: &'static str, value: impl AsRef<OsStr>) -> Self

Trait Implementations

impl Drop for EnvVarGuard

fn drop(&mut self)

Executes the destructor for this type.