use std::path::PathBuf; use crate::remote::fetch; mod error {    /// The error returned when updating references.    #[derive(Debug, thiserror::Error)]    #[expect(missing_docs)]    pub enum Error {        #[error(transparent)]        FindReference(#[from] crate::reference::find::Error),        #[error(            "A remote reference had a name that wasn't considered valid. Corrupt remote repo or insufficient checks on remote?"        )]        InvalidRefName(#[from] gix_validate::reference::name::Error),        #[error("Failed to update references to their new position to match their remote locations")]        EditReferences(#[from] crate::reference::edit::Error),        #[error("Failed to read or iterate worktree dir")]        WorktreeListing(#[from] std::io::Error),        #[error("Could not open worktree repository")]        OpenWorktreeRepo(#[from] crate::open::Error),        #[error("Could not find local commit for fast-forward ancestor check")]        FindCommit(#[from] crate::object::find::existing::Error),        #[error("Could not peel symbolic local reference to its ID")]        PeelToId(#[from] crate::reference::peel::Error),        #[error("Failed to follow a symbolic reference to assure worktree isn't affected")]        FollowSymref(#[from] gix_ref::file::find::existing::Error),        #[error(transparent)]        FindObject(#[from] crate::object::find::Error),    }} pub use error::Error; /// The outcome of the refs-update operation at the end of a fetch.#[derive(Debug, Clone)]pub struct Outcome {    /// All edits that were performed to update local refs.    pub edits: Vec<gix_ref::transaction::RefEdit>,    /// Each update provides more information about what happened to the corresponding mapping.    /// Use [`iter_mapping_updates()`][Self::iter_mapping_updates()] to recombine the update information with ref-edits and their    /// mapping.    pub updates: Vec<super::Update>,} /// Describe the way a ref was updated, with particular focus on how the (peeled) target commit was affected.////// Note that for all the variants that signal a change or `NoChangeNeeded` it's additionally possible to change the target type/// from symbolic to direct, or the other way around.#[derive(Debug, Clone, PartialEq, Eq)]pub enum Mode {    /// No change was attempted as the remote ref didn't change compared to the current ref, or because no remote ref was specified    /// in the ref-spec. Note that the expected value is still asserted to uncover potential race conditions with other processes.    NoChangeNeeded,    /// The old ref's commit was an ancestor of the new one, allowing for a fast-forward without a merge.    FastForward,    /// The ref was set to point to the new commit from the remote without taking into consideration its ancestry.    Forced,    /// A new ref has been created as there was none before.    New,    /// The reference belongs to a tag that was listed by the server but whose target didn't get sent as it doesn't point    /// to the commit-graph we were fetching explicitly.    ///    /// This is kind of update is only happening if `remote.<name>.tagOpt` is not set explicitly to either `--tags` or `--no-tags`.    ImplicitTagNotSentByRemote,    /// The object id to set the target reference to could not be found.    RejectedSourceObjectNotFound {        /// The id of the object that didn't exist in the object database, even though it should since it should be part of the pack.        id: gix_hash::ObjectId,    },    /// Tags can never be overwritten (whether the new object would be a fast-forward or not, or unchanged), unless the refspec    /// specifies force.    RejectedTagUpdate,    /// The reference update would not have been a fast-forward, and force is not specified in the ref-spec.    RejectedNonFastForward,    /// The remote has an unborn symbolic reference where we have one that is set. This means the remote    /// has reset itself to a newly initialized state or a state that is highly unusual.    /// It may also mean that the remote knows the target name, but it's not available locally and not included in the ref-mappings    /// to be created, so we would effectively change a valid local ref into one that seems unborn, which is rejected.    /// Note that this mode may have an associated ref-edit that is a no-op, or current-state assertion, for logistical reasons only    /// and having no edit would be preferred.    RejectedToReplaceWithUnborn,    /// The update was rejected because the branch is checked out in the given worktree_dir.    ///    /// Note that the check applies to any known worktree, whether it's present on disk or not.    RejectedCurrentlyCheckedOut {        /// The path(s) to the worktree directory where the branch is checked out.        worktree_dirs: Vec<PathBuf>,    },} impl std::fmt::Display for Mode {    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {        match self {            Mode::NoChangeNeeded => "up-to-date",            Mode::FastForward => "fast-forward",            Mode::Forced => "forced-update",            Mode::New => "new",            Mode::ImplicitTagNotSentByRemote => "unrelated tag on remote",            Mode::RejectedSourceObjectNotFound { id } => return write!(f, "rejected ({id} not found)"),            Mode::RejectedTagUpdate => "rejected (would overwrite existing tag)",            Mode::RejectedNonFastForward => "rejected (non-fast-forward)",            Mode::RejectedToReplaceWithUnborn => "rejected (refusing to overwrite existing with unborn ref)",            Mode::RejectedCurrentlyCheckedOut { worktree_dirs } => {                return write!(                    f,                    "rejected (cannot write into checked-out branch at \"{}\")",                    worktree_dirs                        .iter()                        .filter_map(|d| d.to_str())                        .collect::<Vec<_>>()                        .join(", ")                );            }        }        .fmt(f)    }} /// Indicates that a ref changes its type.#[derive(Debug, Clone, Copy, PartialEq, Eq, Ord, PartialOrd, Hash)]pub enum TypeChange {    /// A local direct reference is changed into a symbolic one.    DirectToSymbolic,    /// A local symbolic reference is changed into a direct one.    SymbolicToDirect,} impl Outcome {    /// Produce an iterator over all information used to produce the this outcome, ref-update by ref-update, using the `mappings`    /// used when producing the ref update.    ///    /// Note that mappings that don't have a corresponding entry in `refspecs`  these will be `None` even though that should never be the case.    /// This can happen if the `refspecs` passed in aren't the respecs used to create the `mapping`, and it's up to the caller to sort it out.    pub fn iter_mapping_updates<'a, 'b>(        &self,        mappings: &'a [fetch::refmap::Mapping],        refspecs: &'b [gix_refspec::RefSpec],        extra_refspecs: &'b [gix_refspec::RefSpec],    ) -> impl Iterator<        Item = (            &super::Update,            &'a fetch::refmap::Mapping,            Option<&'b gix_refspec::RefSpec>,            Option<&gix_ref::transaction::RefEdit>,        ),    > {        self.updates.iter().zip(mappings.iter()).map(move |(update, mapping)| {            (                update,                mapping,                mapping.spec_index.get(refspecs, extra_refspecs),                update.edit_index.and_then(|idx| self.edits.get(idx)),            )        })    }}