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use std::{env, process::Command};
use hashbrown::HashMap;
/// Returns a QEMU runner target given an architecture.
fn get_qemu_target(arch: &str) -> &str {
match arch {
"armv7" => "arm",
"i686" => "i386",
"powerpc" => "ppc",
"powerpc64le" => "ppc64le",
_ => arch,
}
}
/// This is required since running binary tests via cross can cause be tricky! We need to basically "magically" grab
/// the correct runner in some cases, which can be done by inspecting env variables that should only show up while
/// using cross.
///
/// Originally inspired by [ripgrep's test files](https://cs.github.com/BurntSushi/ripgrep/blob/9f0e88bcb14e02da1b88872435b17d74786640b5/tests/util.rs#L470),
/// but adapted to work more generally with the architectures supported by bottom after looking through cross'
/// [linux-runner](https://github.com/cross-rs/cross/blob/main/docker/linux-runner) file.
fn cross_runner() -> Option<String> {
const TARGET_RUNNER: &str = "CARGO_TARGET_RUNNER";
const CROSS_RUNNER: &str = "CROSS_RUNNER";
let env_mapping = std::env::vars_os()
.filter_map(|(k, v)| {
let (k, v) = (k.to_string_lossy(), v.to_string_lossy());
if k.starts_with("CARGO_TARGET_") && k.ends_with("_RUNNER") && !v.is_empty() {
Some((TARGET_RUNNER.to_string(), v.to_string()))
} else if k == CROSS_RUNNER && !v.is_empty() {
Some((k.to_string(), v.to_string()))
} else {
None
}
})
.collect::<HashMap<_, _>>();
if let Some(cross_runner) = env_mapping.get(CROSS_RUNNER) {
if cross_runner == "qemu-user" {
env_mapping.get(TARGET_RUNNER).map(|target_runner| {
format!(
"qemu-{}",
get_qemu_target(
target_runner
.split_ascii_whitespace()
.collect::<Vec<_>>()
.last()
.unwrap()
)
)
})
} else {
None
}
} else {
env_mapping.get(TARGET_RUNNER).cloned()
}
}
/// Returns the [`Command`] of a binary invocation of bottom.
pub fn btm_command() -> Command {
let btm_exe = env!("CARGO_BIN_EXE_btm");
match cross_runner() {
None => Command::new(btm_exe),
Some(runner) => {
let mut cmd = Command::new(runner);
cmd.arg(btm_exe);
cmd
}
}
}
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