Enum DockerfileFromTarget 

pub enum DockerfileFromTarget {
    Image(ImageReference),
    Stage(String),
    Scratch,
}

A Dockerfile FROM target.

FROM references can resolve to one of three things in a Dockerfile: an OCI image (the common case), a previous stage in a multi-stage build (e.g. FROM builder AS final), or the special scratch pseudo-image. This enum captures all three. For non-Dockerfile call sites (image registry lookups, toolchain detection, etc.) use zlayer_types::ImageReference directly — the bare OCI ref type without the Dockerfile-only variants.

Variants

Image(ImageReference)

An OCI image reference (canonical OCI grammar).

Stage(String)

A reference to another stage in this multi-stage build.

Scratch

The special scratch pseudo-image.

Implementations

impl DockerfileFromTarget

pub fn parse(s: &str) -> Self

Parse a raw FROM target string.

Recognizes scratch (case-insensitive), then attempts an OCI reference parse via ImageReference::from_str. If parsing succeeds, the result is an Self::Image; otherwise the input is treated as a Self::Stage reference.

Note that the OCI grammar accepts bare names like alpine as valid image references, so disambiguation between an image and a multi-stage stage reference must happen post-hoc at the call site by consulting the set of known stage names.

pub fn is_stage(&self) -> bool

Returns true if this is a stage reference.

pub fn is_scratch(&self) -> bool

Returns true if this is the scratch pseudo-image.

Trait Implementations

impl Clone for DockerfileFromTarget

fn clone(&self) -> DockerfileFromTarget

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DockerfileFromTarget

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DockerfileFromTarget

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for DockerfileFromTarget

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

Formats the value using the given formatter.

impl PartialEq for DockerfileFromTarget

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for DockerfileFromTarget

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for DockerfileFromTarget

impl StructuralPartialEq for DockerfileFromTarget