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use std::ptr::NonNull;
use anyhow::Result;
use nix_bindings_store_sys as raw;
use nix_bindings_util::{
result_string_init,
string_return::{callback_get_result_string, callback_get_result_string_data},
};
pub struct StorePath {
raw: NonNull<raw::StorePath>,
}
impl StorePath {
/// Get the name of the store path.
///
/// For a store path like `/nix/store/abc1234...-foo-1.2`, this function will return `foo-1.2`.
pub fn name(&self) -> Result<String> {
unsafe {
let mut r = result_string_init!();
raw::store_path_name(
self.as_ptr(),
Some(callback_get_result_string),
callback_get_result_string_data(&mut r),
);
r
}
}
/// This is a low level function that you shouldn't have to call unless you are developing the Nix bindings.
///
/// Construct a new `StorePath` by first cloning the C store path.
///
/// # Safety
///
/// This does not take ownership of the C store path, so it should be a borrowed pointer, or you should free it.
pub unsafe fn new_raw_clone(raw: NonNull<raw::StorePath>) -> Self {
Self::new_raw(
NonNull::new(raw::store_path_clone(raw.as_ptr()))
.or_else(|| panic!("nix_store_path_clone returned a null pointer"))
.unwrap(),
)
}
/// This is a low level function that you shouldn't have to call unless you are developing the Nix bindings.
///
/// Takes ownership of a C `nix_store_path`. It will be freed when the `StorePath` is dropped.
///
/// # Safety
///
/// The caller must ensure that the provided `NonNull<raw::StorePath>` is valid and that the ownership
/// semantics are correctly followed. The `raw` pointer must not be used after being passed to this function.
pub unsafe fn new_raw(raw: NonNull<raw::StorePath>) -> Self {
StorePath { raw }
}
/// This is a low level function that you shouldn't have to call unless you are developing the Nix bindings.
///
/// Get a pointer to the underlying Nix C API store path.
///
/// # Safety
///
/// This function is unsafe because it returns a raw pointer. The caller must ensure that the pointer is not used beyond the lifetime of this `StorePath`.
pub unsafe fn as_ptr(&self) -> *mut raw::StorePath {
self.raw.as_ptr()
}
}
impl Clone for StorePath {
fn clone(&self) -> Self {
unsafe { Self::new_raw_clone(self.raw) }
}
}
impl Drop for StorePath {
fn drop(&mut self) {
unsafe {
raw::store_path_free(self.as_ptr());
}
}
}
#[cfg(test)]
mod tests {
#[test]
#[cfg(nix_at_least = "2.26" /* get_storedir */)]
fn store_path_name() {
let mut store = crate::store::Store::open(Some("dummy://"), []).unwrap();
let store_dir = store.get_storedir().unwrap();
let store_path_string =
format!("{store_dir}/rdd4pnr4x9rqc9wgbibhngv217w2xvxl-bash-interactive-5.2p26");
let store_path = store.parse_store_path(store_path_string.as_str()).unwrap();
assert_eq!(store_path.name().unwrap(), "bash-interactive-5.2p26");
}
}