use std::{    borrow::Cow,    path::{Path, PathBuf},}; use crate::{bstr::BStr, store::WriteReflog, Namespace}; /// A store for reference which uses plain files.////// Each ref is represented as a single file on disk in a folder structure that follows the relative path/// used to identify [references][crate::Reference].#[derive(Debug, Clone)]pub struct Store {    /// The location at which loose references can be found as per conventions of a typical git repository.    ///    /// Typical base paths are `.git` repository folders.    git_dir: PathBuf,    /// Possibly the common directory at which to find shared references. Only set if this `Store` is for a work tree.    common_dir: Option<PathBuf>,    /// The kind of hash to assume in a couple of situations. Note that currently we are able to read any valid hash from files    /// which might want to change one day.    object_hash: git_hash::Kind,     /// The way to handle reflog edits    pub write_reflog: WriteReflog,    /// The namespace to use for edits and reads    pub namespace: Option<Namespace>,    /// A packed buffer which can be mapped in one version and shared as such.    /// It's updated only in one spot, which is prior to reading it based on file stamps.    /// Doing it like this has the benefit of being able to hand snapshots out to people without blocking others from updating it.    packed: packed::modifiable::MutableSharedBuffer,} mod access {    use std::path::Path;     use crate::file;     impl file::Store {        /// Return the `.git` directory at which all references are loaded.        ///        /// For worktrees, this is the linked work-tree private ref location,        /// then [`common_dir()`][file::Store::common_dir()] is `Some(parent_git_dir)`.        pub fn git_dir(&self) -> &Path {            &self.git_dir        }         /// If this is a linked work tree, there will be `Some(git_dir)` pointing to the parent repository,        /// while [`git_dir()`][file::Store::git_dir()] points to the location holding linked work-tree private references.        pub fn common_dir(&self) -> Option<&Path> {            self.common_dir.as_deref()        }         /// Similar to [`common_dir()`][file::Store::common_dir()], but it will produce either the common-dir, or the git-dir if the former        /// isn't present.        ///        /// This is also the directory in which the packed references file would be placed.        pub fn common_dir_resolved(&self) -> &Path {            self.common_dir.as_deref().unwrap_or(&self.git_dir)        }    }} /// A transaction on a file storepub struct Transaction<'s> {    store: &'s Store,    packed_transaction: Option<crate::store_impl::packed::Transaction>,    updates: Option<Vec<transaction::Edit>>,    packed_refs: transaction::PackedRefs,} pub(in crate::store_impl::file) fn path_to_name<'a>(path: impl Into<Cow<'a, Path>>) -> Cow<'a, BStr> {    let path = git_path::into_bstr(path.into());    git_path::to_unix_separators_on_windows(path)} ///pub mod loose;mod overlay_iter; ///pub mod iter {    pub use super::overlay_iter::{LooseThenPacked, Platform};     ///    pub mod loose_then_packed {        pub use super::super::overlay_iter::Error;    }} ///pub mod log; ///pub mod find; ///pub mod transaction; ///pub mod packed; mod raw_ext;pub use raw_ext::ReferenceExt;