Struct Platform 

pub struct Platform {
    pub host: String,
    pub target: Option<String>,
    pub container_platform: Option<String>,
}

A step’s fully-composed platform triple-set (R531-F2, W222): where it runs (host), what it produces (target), and the arch of the image it pulls (container_platform).

Built at plan time by Platform::compose from the runner’s self-detected host (R531-T1) plus the step’s declared PlatformSpec — falling back to the legacy per-kind triple field so existing package-native-tarball TOML keeps producing the right target without a [platform] block. F3’s resolve(host, target, container_platform) decision table consumes this directly.

Fields

host: String

Where the step’s commands actually execute — the runner host triple.

target: Option<String>

What the step produces. None = host-native, nothing cross-built.

container_platform: Option<String>

Arch of the base image the step pulls (linux/amd64). None = no container, or the host-platform default.

Implementations

impl Platform

pub fn compose( host: impl Into<String>, declared: Option<&PlatformSpec>, triple_field: Option<&str>, ) -> Self

Compose the triple-set for a step.

• host — the runner’s self-detected triple (R531-T1).
• declared — the step’s [platform] block, if any.
• triple_field — the legacy per-kind triple (package-native-tarball / sign-native-tarball), used as the target fallback so existing TOML keeps working: an explicit [platform].target always wins over it.

pub fn is_cross_arch(&self) -> bool

True when the step builds for an arch other than the host’s. A target of None (host-native) is never cross. Compared on the arch segment only — x86_64-apple-darwin on an x86_64-unknown-linux-gnu host is not a cross arch even though the full triples differ (the OS/cross distinction is F3’s resolution concern, not this predicate’s).

pub fn container_is_foreign_arch(&self) -> bool

True when the step pulls a container image whose arch differs from the host’s — the exact host ≠ container_platform mismatch that produced the mesofact no matching manifest for linux/arm64 faceplant in W222. The linux/amd64 docker-platform vocabulary is normalized to a bare arch for the comparison.

Trait Implementations

impl Clone for Platform

fn clone(&self) -> Platform

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Platform

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

Formats the value using the given formatter.

impl Eq for Platform

impl PartialEq for Platform

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Platform