Function findValue

src/spec-node/dockerfileUtils.ts:181–214

(dockerfile: Dockerfile, buildArgs: Record<string, string>, baseImageEnv: Record<string, string>, globalBuildxPlatformArgs: Record<string, string> = {}, variable: string, stage: { from?: From; instructions: Instruction[] }, beforeInstructionIndex: number)

}

function findValue(dockerfile: Dockerfile, buildArgs: Record<string, string>, baseImageEnv: Record<string, string>, globalBuildxPlatformArgs: Record<string, string> = {}, variable: string, stage: { from?: From; instructions: Instruction[] }, beforeInstructionIndex: number): string | undefined {
	let considerArg = true;
	const seen = new Set<typeof stage>();
	while (true) {
		if (seen.has(stage)) {
			return undefined;
		}
		seen.add(stage);

		const i = findLastIndex(stage.instructions, i => i.name === variable && (i.instruction === 'ENV' || (considerArg && typeof (buildArgs[i.name] ?? i.value) === 'string')), beforeInstructionIndex - 1);
		if (i !== -1) {
			const instruction = stage.instructions[i];
			if (instruction.instruction === 'ENV') {
				return replaceVariables(dockerfile, buildArgs, baseImageEnv, globalBuildxPlatformArgs, instruction.value!, stage, i);
			}
			if (instruction.instruction === 'ARG') {
				return replaceVariables(dockerfile, buildArgs, baseImageEnv, globalBuildxPlatformArgs, buildArgs[instruction.name] ?? instruction.value, stage, i);
			}
		}

		if (!stage.from) {
			const value = baseImageEnv[variable] ?? globalBuildxPlatformArgs[variable];
			if (typeof value === 'string') {
				return value;
			}
			return undefined;
		}

		const image = replaceVariables(dockerfile, buildArgs, baseImageEnv, globalBuildxPlatformArgs, stage.from.image, dockerfile.preamble, dockerfile.preamble.instructions.length);
		stage = dockerfile.stagesByLabel[image] || dockerfile.preamble;
		beforeInstructionIndex = stage.instructions.length;
		considerArg = stage === dockerfile.preamble;
	}
}

function findLastIndex<T>(array: T[], predicate: (value: T, index: number, obj: T[]) => boolean, position = array.length - 1): number {
	for (let i = position; i >= 0; i--) {