Enum EnvironmentError 

#[non_exhaustive]
pub enum EnvironmentError {
    EmptyName,
    NameContainsEquals {
        entry: String,
    },
    MissingForExec {
        variable: &'static str,
        program: String,
        declared: String,
    },
}

A fault in an environment DECLARATION, or in launching against one.

Separate from HarnessError because a declaration is validated where it is read — in a document checker, in a CLI, in a launcher — long before any harness exists to report through. From carries it onto the seam when a launch is what failed.

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.

EmptyName

A declared entry has an empty variable name.

No process environment can carry one, so the entry is an unfilled template rather than a variable anybody meant to pass through.

NameContainsEquals

A declared entry is a KEY=VALUE pair rather than a name.

The declaration passes a variable THROUGH: its value comes from the launching context. Splitting the pair silently would leave the operator believing a value they wrote is in force when the box’s value is.

Fields

entry: String

The offending entry, verbatim.

MissingForExec

The declaration omits a variable this particular launch cannot proceed without.

Raised BEFORE the spawn, so the refusal names the variable instead of arriving as the kernel’s No such file or directory against a correctly spelled command.

Fields

variable: &'static str

The variable the launch needs and the declaration omits.

program: String

The program that cannot be resolved without it.

declared: String

What the declaration does carry, rendered for the refusal.

Trait Implementations

impl Clone for EnvironmentError

fn clone(&self) -> EnvironmentError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EnvironmentError

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

Formats the value using the given formatter.

impl Display for EnvironmentError

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

Formats the value using the given formatter.

impl Eq for EnvironmentError

impl Error for EnvironmentError

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<EnvironmentError> for HarnessError

fn from(error: EnvironmentError) -> Self

Converts to this type from the input type.

impl PartialEq for EnvironmentError

fn eq(&self, other: &EnvironmentError) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for EnvironmentError