Struct VariableContext 

pub struct VariableContext {
    pub build_args: HashMap<String, String>,
    pub arg_defaults: HashMap<String, String>,
    pub env_vars: HashMap<String, String>,
}

Builder for tracking variable state during Dockerfile processing

Fields

build_args: HashMap<String, String>

Build-time ARG values (from –build-arg)

arg_defaults: HashMap<String, String>

ARG default values from Dockerfile

env_vars: HashMap<String, String>

ENV values accumulated during processing

Implementations

impl VariableContext

pub fn new() -> Self

Create a new variable context

pub fn with_build_args(build_args: HashMap<String, String>) -> Self

Create with build-time arguments

pub fn add_arg(&mut self, name: impl Into<String>, default: Option<String>)

Register an ARG with optional default

pub fn set_env(&mut self, name: impl Into<String>, value: impl Into<String>)

Set an ENV variable

pub fn effective_args(&self) -> HashMap<String, String>

Get the effective ARG values (build-time overrides defaults)

pub fn expand(&self, input: &str) -> String

Expand variables in a string using the current context

pub fn expand_list(&self, inputs: &[String]) -> Vec<String>

Expand variables in a list of strings

Trait Implementations

impl Clone for VariableContext

fn clone(&self) -> VariableContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VariableContext

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

Formats the value using the given formatter.

impl Default for VariableContext

fn default() -> VariableContext

Returns the “default value” for a type.