use crate::bstr::{BStr, BString}; /// If `Yes`, don't really make changes but do as much as possible to get an idea of what would be done.#[derive(Debug, Copy, Clone, PartialEq, Eq)]#[cfg(any(feature = "blocking-network-client", feature = "async-network-client"))]pub(crate) enum DryRun {    /// Enable dry-run mode and don't actually change the underlying repository in any way.    Yes,    /// Run the operation like normal, making changes to the underlying repository.    No,} /// How to deal with refs when cloning or fetching.#[derive(Debug, Copy, Clone, PartialEq, Eq)]#[cfg(any(feature = "blocking-network-client", feature = "async-network-client"))]pub(crate) enum WritePackedRefs {    /// Normal operation, i.e. don't use packed-refs at all for writing.    Never,    /// Put ref updates straight into the `packed-refs` file, without creating loose refs first or dealing with them in any way.    Only,} /// Information about the relationship between our refspecs, and remote references with their local counterparts.#[derive(Default, Debug, Clone)]pub struct RefMap {    /// A mapping between a remote reference and a local tracking branch.    pub mappings: Vec<Mapping>,    /// Information about the fixes applied to the `mapping` due to validation and sanitization.    pub fixes: Vec<git_refspec::match_group::validate::Fix>,    /// All refs advertised by the remote.    pub remote_refs: Vec<git_protocol::handshake::Ref>,    /// Additional information provided by the server as part of the handshake.    ///    /// Note that the `refs` field is always `None` as the refs are placed in `remote_refs`.    pub handshake: git_protocol::handshake::Outcome,    /// The kind of hash used for all data sent by the server, if understood by this client implementation.    ///    /// It was extracted from the `handshake` as advertised by the server.    pub object_hash: git_hash::Kind,} /// Either an object id that the remote has or the matched remote ref itself.#[derive(Debug, Clone)]pub enum Source {    /// An object id, as the matched ref-spec was an object id itself.    ObjectId(git_hash::ObjectId),    /// The remote reference that matched the ref-specs name.    Ref(git_protocol::handshake::Ref),} impl Source {    /// Return either the direct object id we refer to or the direct target that a reference refers to.    /// The latter may be a direct or a symbolic reference, and we degenerate this to the peeled object id.    /// If unborn, `None` is returned.    pub fn as_id(&self) -> Option<&git_hash::oid> {        match self {            Source::ObjectId(id) => Some(id),            Source::Ref(r) => r.unpack().1,        }    }     /// Return ourselves as the full name of the reference we represent, or `None` if this source isn't a reference but an object.    pub fn as_name(&self) -> Option<&BStr> {        match self {            Source::ObjectId(_) => None,            Source::Ref(r) => match r {                git_protocol::handshake::Ref::Unborn { full_ref_name, .. }                | git_protocol::handshake::Ref::Symbolic { full_ref_name, .. }                | git_protocol::handshake::Ref::Direct { full_ref_name, .. }                | git_protocol::handshake::Ref::Peeled { full_ref_name, .. } => Some(full_ref_name.as_ref()),            },        }    }} /// A mapping between a single remote reference and its advertised objects to a local destination which may or may not exist.#[derive(Debug, Clone)]pub struct Mapping {    /// The reference on the remote side, along with information about the objects they point to as advertised by the server.    pub remote: Source,    /// The local tracking reference to update after fetching the object visible via `remote`.    pub local: Option<BString>,    /// The index into the fetch ref-specs used to produce the mapping, allowing it to be recovered.       pub spec_index: usize,} #[cfg(any(feature = "blocking-network-client", feature = "async-network-client"))]pub use super::connection::fetch::{negotiate, prepare, refs, Error, Outcome, Prepare, RefLogMessage, Status};