Enum MountError 

pub enum MountError {
    NotFound(String),
    Stale(String),
    NotADirectory(String),
    UnknownThread(String),
    ReadOnly,
    AlreadyExists(String),
    IsADirectory(String),
    NotEmpty(String),
    InvalidArgument(String),
    SessionInit(String),
    Store(HeddleError),
}

Errors surfaced by the content-addressed mount core.

Variants

NotFound(String)

The requested path or node does not exist in the current state.

Stale(String)

The node referenced by the caller is no longer valid (stale inode, invalidated cache, etc).

NotADirectory(String)

A path component traversed something that wasn’t a directory.

UnknownThread(String)

The thread name does not resolve to a current state.

ReadOnly

Read-only filesystem (used while overlay-write is stubbed).

AlreadyExists(String)

An entry with this name already exists (e.g. O_CREAT|O_EXCL against an existing file, or mkdir against an existing dir). Maps to EEXIST so userspace tooling that exercises atomic “create-or-skip” semantics (cargo’s lockfile lease, git’s objects/<n>/<n>.tmp placement) sees the conventional errno.

IsADirectory(String)

Tried to operate on a file as if it were a directory (e.g. unlink against a path that resolves to a directory). Maps to EISDIR.

NotEmpty(String)

Tried to rmdir a directory that still has visible children (across the captured tree + pending overlay). Maps to ENOTEMPTY.

InvalidArgument(String)

Invalid argument from the caller (e.g. a name containing /, \0, or ./..). Maps to EINVAL.

SessionInit(String)

The platform shell failed to construct its mount session (e.g. the Swift FSKit shim returned a null session handle). Maps to EIO: the mount never came up, nothing to retry at the filesystem layer.

Store(HeddleError)

Errors bubbling up from the underlying object store / repo.

Implementations

impl MountError

pub fn to_errno(&self) -> i32

Translate this error into a libc errno suitable for handing back to FUSE. Only the platform shell uses this — keeping it here means platform code stays one-liners.

ESTALE is POSIX-only; on Windows libc doesn’t define it, so the Windows build uses the POSIX value (116) verbatim. The ProjFS shell translates this back into a Win32 ERROR_FILE_INVALID further downstream — no caller looks at the raw integer except as a match discriminant.

Trait Implementations

impl Debug for MountError

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

Formats the value using the given formatter.

impl Display for MountError

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

Formats the value using the given formatter.

impl Error for MountError

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<HeddleError> for MountError

fn from(source: HeddleError) -> Self

Converts to this type from the input type.