pub use bstr;use once_cell::sync::Lazy;use std::{collections::BTreeMap, path::Path, path::PathBuf, sync::Mutex}; pub use tempfile; static SCRIPT_IDENTITY: Lazy<Mutex<BTreeMap<PathBuf, u32>>> = Lazy::new(|| Mutex::new(BTreeMap::new())); pub fn fixture_path(path: impl AsRef<str>) -> PathBuf {    PathBuf::from("tests").join("fixtures").join(path.as_ref())}pub fn scripted_fixture_repo_read_only(script_name: &str) -> std::result::Result<PathBuf, Box<dyn std::error::Error>> {    scripted_fixture_repo_read_only_with_args(script_name, None)} /// Returns the directory at which the data is presentpub fn scripted_fixture_repo_read_only_with_args(    script_name: &str,    args: impl IntoIterator<Item = &'static str>,) -> std::result::Result<PathBuf, Box<dyn std::error::Error>> {    use bstr::ByteSlice;    let script_path = fixture_path(script_name);     // keep this lock to assure we don't return unfinished directories for threaded callers    let args: Vec<String> = args.into_iter().map(Into::into).collect();    let mut map = SCRIPT_IDENTITY.lock().unwrap();    let script_identity = map        .entry(args.iter().fold(script_path.clone(), |p, a| p.join(a)))        .or_insert_with(|| {            let mut crc_value = crc::crc32::update(                0,                &crc::crc32::IEEE_TABLE,                &std::fs::read(&script_path).expect("file can be read entirely"),            );            for arg in args.iter() {                crc_value = crc::crc32::update(crc_value, &crc::crc32::IEEE_TABLE, arg.as_bytes());            }            crc_value        })        .to_owned();    let script_result_directory = fixture_path(        Path::new("generated")            .join(format!("{}", script_identity))            .to_string_lossy(),    );    if !script_result_directory.is_dir() {        std::fs::create_dir_all(&script_result_directory)?;        let script_absolute_path = std::env::current_dir()?.join(script_path);        let output = std::process::Command::new("bash")            .arg(script_absolute_path)            .args(args)            .stdout(std::process::Stdio::piped())            .stderr(std::process::Stdio::piped())            .current_dir(&script_result_directory)            .env_remove("GIT_DIR")            .env("GIT_AUTHOR_DATE", "2000-01-01 00:00:00 +0000")            .env("GIT_AUTHOR_EMAIL", "author@example.com")            .env("GIT_AUTHOR_NAME", "author")            .env("GIT_COMMITTER_DATE", "2000-01-02 00:00:00 +0000")            .env("GIT_COMMITTER_EMAIL", "committer@example.com")            .env("GIT_COMMITTER_NAME", "committer")            .output()?;        assert!(            output.status.success(),            "repo script failed: stdout: {}\nstderr: {}",            output.stdout.as_bstr(),            output.stderr.as_bstr()        );    }    Ok(script_result_directory)}