use std::path::PathBuf; use git_path::realpath::MAX_SYMLINKS; impl crate::Repository {    /// Return the path to the repository itself, containing objects, references, configuration, and more.    ///    /// Synonymous to [`path()`][crate::Repository::path()].    pub fn git_dir(&self) -> &std::path::Path {        self.refs.git_dir()    }     /// The trust we place in the git-dir, with lower amounts of trust causing access to configuration to be limited.    pub fn git_dir_trust(&self) -> git_sec::Trust {        self.options.git_dir_trust.expect("definitely set by now")    }     /// Returns the main git repository if this is a repository on a linked work-tree, or the `git_dir` itself.    pub fn common_dir(&self) -> &std::path::Path {        self.common_dir.as_deref().unwrap_or_else(|| self.git_dir())    }     /// Return the path to the worktree index file, which may or may not exist.    pub fn index_path(&self) -> PathBuf {        self.git_dir().join("index")    }     /// The path to the `.git` directory itself, or equivalent if this is a bare repository.    pub fn path(&self) -> &std::path::Path {        self.git_dir()    }     /// Return the work tree containing all checked out files, if there is one.    pub fn work_dir(&self) -> Option<&std::path::Path> {        self.work_tree.as_deref()    }     // TODO: tests, respect precomposeUnicode    /// The directory of the binary path of the current process.    pub fn install_dir(&self) -> std::io::Result<PathBuf> {        crate::path::install_dir()    }     /// Returns the relative path which is the components between the working tree and the current working dir (CWD).    /// Note that there may be `None` if there is no work tree, even though the `PathBuf` will be empty    /// if the CWD is at the root of the work tree.    // TODO: tests, details - there is a lot about environment variables to change things around.    pub fn prefix(&self) -> Option<std::io::Result<PathBuf>> {        self.work_tree.as_ref().map(|root| {            std::env::current_dir().and_then(|cwd| {                git_path::realpath_opts(root, &cwd, MAX_SYMLINKS)                    .map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err))                    .and_then(|root| {                        cwd.strip_prefix(&root)                            .map_err(|_| {                                std::io::Error::new(                                    std::io::ErrorKind::Other,                                    format!(                                        "CWD '{}' isn't within the work tree '{}'",                                        cwd.display(),                                        root.display()                                    ),                                )                            })                            .map(ToOwned::to_owned)                    })            })        })    }     /// Return the kind of repository, either bare or one with a work tree.    pub fn kind(&self) -> crate::Kind {        match self.worktree() {            Some(wt) => {                if git_discover::is_submodule_git_dir(self.git_dir()) {                    crate::Kind::Submodule                } else {                    crate::Kind::WorkTree {                        is_linked: !wt.is_main(),                    }                }            }            None => crate::Kind::Bare,        }    }}