snyk-docker-plugin
Version:
Snyk CLI docker plugin
50 lines • 2.28 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.extractImageLayer = void 0;
const Debug = require("debug");
const gunzip = require("gunzip-maybe");
const path = require("path");
const tar_stream_1 = require("tar-stream");
const callbacks_1 = require("./callbacks");
const debug = Debug("snyk");
/**
* Extract key files from the specified TAR stream.
* @param layerTarStream image layer as a Readable TAR stream. Note: consumes the stream.
* @param extractActions array of pattern, callbacks pairs
* @returns extracted file products
*/
async function extractImageLayer(layerTarStream, extractActions) {
return new Promise((resolve, reject) => {
const result = {};
const tarExtractor = (0, tar_stream_1.extract)();
tarExtractor.on("entry", async (headers, stream, next) => {
if (headers.type === "file") {
const absoluteFileName = path.join(path.sep, headers.name);
const matchedActions = extractActions.filter((action) => action.filePathMatches(absoluteFileName));
if (matchedActions.length > 0) {
try {
const callbackResult = await (0, callbacks_1.applyCallbacks)(matchedActions, stream, headers.size);
if (!(0, callbacks_1.isResultEmpty)(callbackResult)) {
result[absoluteFileName] = callbackResult;
}
}
catch (error) {
// An ExtractAction has thrown an uncaught exception, likely a bug in the code!
debug("Exception thrown while applying callbacks during image layer extraction", JSON.stringify(error));
reject(error);
}
}
}
stream.resume(); // auto drain the stream
next(); // ready for next entry
});
tarExtractor.on("finish", () => {
// all layer level entries read
resolve(result);
});
tarExtractor.on("error", (error) => reject(error));
layerTarStream.pipe(gunzip()).pipe(tarExtractor);
});
}
exports.extractImageLayer = extractImageLayer;
//# sourceMappingURL=layer.js.map