Enum CachePolicy 

pub enum CachePolicy {
    RetainRunnerPackage,
    DiscardRunnerPackage,
}

What survives an attempt’s cleanup.

04-subsystem-contracts.md, precedence rule 6: “Runtime cache retention is optional; job workspace retention is always disabled in v1.”

The first half is the choice this enum offers. The second half is enforced by having no representation at all: CachePolicy::retains_job_workspace is a const fn returning false, and there is no variant, field, or constructor that could make it return anything else. A future version that wants workspace retention has to add one deliberately, which is the point — a retained workspace is the two-job contamination path that e3 and 07-security.md test against.

Variants

RetainRunnerPackage

Keep the verified runner package cache between attempts (the default; re-downloading it on every cold start would be the main avoidable cost).

DiscardRunnerPackage

Discard the runner package cache after each attempt.

Implementations

impl CachePolicy

pub const fn retains_runner_package(self) -> bool

pub const fn retains_job_workspace(self) -> bool

Always false, by construction rather than by policy.

D4 is the deliberate addition the type comment anticipated, and it was made on another type: job-workspace retention is crate::workspace::WorkspacePolicy, repository-scoped, opt-in, and carrying its own root. Nothing was added here, so a caller reading a CachePolicy still cannot conclude anything about the job workspace — which is the point of keeping them apart (02-target-architecture.md, “Repository policy”).

Trait Implementations

impl Clone for CachePolicy

fn clone(&self) -> CachePolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CachePolicy

impl Debug for CachePolicy

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

Formats the value using the given formatter.

impl Default for CachePolicy

fn default() -> CachePolicy

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CachePolicy

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for CachePolicy

impl Hash for CachePolicy

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for CachePolicy

fn cmp(&self, other: &CachePolicy) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

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

Restrict a value to a certain range.

impl PartialEq for CachePolicy

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for CachePolicy

fn partial_cmp(&self, other: &CachePolicy) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for CachePolicy

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for CachePolicy