Hashing a filesystem hierarchy.

hashwalk.js

#!/usr/bin/env node

const fs = require("fs");
const crypto = require("crypto");
const walk = require("walk");
const concat = require("concat-stream");

const walker = walk.walk("/usr/share/man");

const hashes = {};

walker.on("file", function(root, stats, next) {
  const fullName = root + "/" + stats.name;

  const hash = crypto.createHash("sha256");
  hash.setEncoding("hex");

  const input = fs.createReadStream(fullName);
  const output = concat(function(data) {
    hashes[fullName] = data;
  });

  input.pipe(hash).pipe(output);

  next();
});

walker.on("end", function() {
  console.log(hashes);
});