Function findBaseImage

src/spec-node/dockerfileUtils.ts:103–120

(dockerfile: Dockerfile, buildArgs: Record<string, string>, target: string | undefined, globalBuildxPlatformArgs: Record<string, string> = {})

}

export function findBaseImage(dockerfile: Dockerfile, buildArgs: Record<string, string>, target: string | undefined, globalBuildxPlatformArgs: Record<string, string> = {}) {
	let stage: Stage | undefined = target ? dockerfile.stagesByLabel[target] : dockerfile.stages[dockerfile.stages.length - 1];
	const seen = new Set<Stage>();
	while (stage) {
		if (seen.has(stage)) {
			return undefined;
		}
		seen.add(stage);

		const image = replaceVariables(dockerfile, buildArgs, /* not available in FROM instruction */ {}, globalBuildxPlatformArgs, stage.from.image, dockerfile.preamble, dockerfile.preamble.instructions.length);
		const nextStage = dockerfile.stagesByLabel[image];
		if (!nextStage) {
			return image;
		}
		stage = nextStage;
	}
	return undefined;
}

function extractDirectives(preambleStr: string) {
	const map: Record<string, string> = {};