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-rw-r--r--security/nss/automation/taskcluster/graph/src/context_hash.js43
1 files changed, 43 insertions, 0 deletions
diff --git a/security/nss/automation/taskcluster/graph/src/context_hash.js b/security/nss/automation/taskcluster/graph/src/context_hash.js
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index 000000000..f0a2e9a88
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+++ b/security/nss/automation/taskcluster/graph/src/context_hash.js
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import fs from "fs";
+import path from "path";
+import crypto from "crypto";
+import flatmap from "flatmap";
+
+// Compute the SHA-256 digest.
+function sha256(data) {
+ let hash = crypto.createHash("sha256");
+ hash.update(data);
+ return hash.digest("hex");
+}
+
+// Recursively collect a list of all files of a given directory.
+function collectFilesInDirectory(dir) {
+ return flatmap(fs.readdirSync(dir), entry => {
+ let entry_path = path.join(dir, entry);
+
+ if (fs.lstatSync(entry_path).isDirectory()) {
+ return collectFilesInDirectory(entry_path);
+ }
+
+ return [entry_path];
+ });
+}
+
+// Compute a context hash for the given context path.
+export default function (context_path) {
+ let root = path.join(__dirname, "../../../..");
+ let dir = path.join(root, context_path);
+ let files = collectFilesInDirectory(dir).sort();
+ let hashes = files.map(file => {
+ return sha256(file + "|" + fs.readFileSync(file, "utf-8"));
+ });
+
+ // Generate a new prefix every month to ensure the image stays buildable.
+ let now = new Date();
+ let prefix = `${now.getUTCFullYear()}-${now.getUTCMonth() + 1}:`;
+ return sha256(prefix + hashes.join(","));
+}