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extern crate once_cell;
use std::fs;
use once_cell::sync::OnceCell;
fn has_docker_env_file() -> bool {
fs::metadata("/.dockerenv").is_ok()
}
fn has_docker_in_cgroup() -> bool {
match fs::read_to_string("/proc/self/cgroup") {
Ok(file_contents) => file_contents.contains("docker"),
Err(_error) => false,
}
}
pub fn is_docker() -> bool {
static CACHED_RESULT: OnceCell<bool> = OnceCell::new();
*CACHED_RESULT.get_or_init(|| {
has_docker_env_file() || has_docker_in_cgroup()
})
}
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