Enum Error 

#[non_exhaustive]
pub enum Error {
    InvalidRefName {
        name: String,
        reason: &'static str,
    },
    RefNameConflict {
        name: String,
        conflicts_with: String,
    },
    CorruptObject {
        oid: ObjectId,
        reason: String,
    },
    MissingObject {
        id: ObjectId,
        referrer: Option<ObjectId>,
    },
    HashKindMismatch {
        stored: Kind,
        requested: Kind,
    },
    StoreLocked {
        path: PathBuf,
    },
    Hash(Error),
    Io(Error),
    Backend(Error),
}

Everything gunnar-store itself can go wrong with.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

InvalidRefName

A reference name is not a legal git reference name.

Raised by crate::refname::validate. A name with a .. component in it is how a path sandbox gets walked out of, so this is a security boundary as much as a correctness one.

Fields

name: String

The offending name, lossily decoded for display.

reason: &'static str

Why it was rejected.

RefNameConflict

Two reference names cannot both exist: one is a directory prefix of the other.

refs/heads/x and refs/heads/x/y are a file and a directory of the same name in a loose-ref backend, and git refuses the pair on every backend so a repository stays convertible between them. Nothing raced and retrying will never help, which is why it is a variant of its own.

Measured, git 2.53.0, git push into a bare repository: the per-ref answer is ! [remote rejected] (refname conflict), and when both names arrive in one push the server refuses the batch with cannot process 'refs/heads/x' and 'refs/heads/x/y' at the same time.

Fields

name: String

The reference the transaction tried to write.

conflicts_with: String

The reference already present, or written by the same transaction, that is a directory prefix of name or has name as one.

CorruptObject

An object’s stored bytes could not be decoded.

Fields

oid: ObjectId

The object that failed to decode.

reason: String

Why decoding failed.

MissingObject

An object that something else points at is not in the store.

Raised while walking a reference’s closure: a repository that cannot serve one of its own refs. Not a fault of the caller’s request, which is why it is not an Error::Backend.

Fields

id: ObjectId

The object that could not be found.

referrer: Option<ObjectId>

What pointed at it, when that is known.

HashKindMismatch

The store was opened with one hash kind but is holding another.

A sha1 repo and a sha256 repo are different repos; silently mixing them would produce oids that no client can verify.

Fields

stored: Kind

What the store already contains.

requested: Kind

What the caller asked for.

StoreLocked

Another writer already holds this store’s exclusive lock.

Compare-and-swap over an append-only log is only sound with one writer: two appenders at the end of an Arrow IPC stream interleave and destroy the frame boundaries, and the format has no reservation protocol. A second gunnar therefore refuses to start (the Arrow-IPC ref log).

Since the liveness check this means the holder is alive, or that it could not be shown to be gone: no /proc, an unreadable owner line, or a lock written by a gunnar that recorded no start time. A lock whose owner is provably gone is reclaimed by ArrowLogStore::open itself and never produces this error. ArrowLogStore::force_unlock is for the undecidable remainder.

Fields

path: PathBuf

The lock file that is already present.

Hash(Error)

Hashing failed. Since gix-hash 0.27 (gix 0.88, 2026-10-02) hashing reports a gix_error exception instead of hasher::Error; it is kept here as a gix_error::Error.

Io(Error)

I/O failed.

Backend(Error)

A backend-specific failure that has no gunnar-level meaning.

Implementations

impl Error

pub fn is_name_conflict(&self) -> bool

true if two names were refused because they cannot coexist.

Kept as a predicate rather than left to a matches! at each call site because receive-pack reports it to the client as a refname conflict, which is a different answer from a non-fast-forward and from an internal error, and a retry will never change it.

pub fn backend(msg: impl Display) -> Self

Build a Error::Backend from anything printable.

Trait Implementations

impl Debug for Error

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Error

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for Error

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Exn<Message>> for Error

Every gix call that reports Exn<Message> inside this crate is a hash computation (compute_hash, Hasher::try_finalize), so ? lands in Error::Hash exactly as #[from] gix_hash::hasher::Error did before gix 0.88.

fn from(err: Exn<Message>) -> Self

Converts to this type from the input type.