From 7ac987ea06b6713291a89c67fa4397adfd2a16ca Mon Sep 17 00:00:00 2001
From: zkochan <zoltan.kochan@gmail.com>
Date: Sun, 5 Feb 2017 15:43:10 +0200
Subject: [PATCH] feat: save the original shasum of each package in the store

Rel #585
---
 package.json         |  1 +
 src/fs/dirsum.ts     | 10 ++++++++++
 src/install/fetch.ts | 15 +++++++++++++++
 typings/local.d.ts   |  5 +++++
 4 files changed, 31 insertions(+)
 create mode 100644 src/fs/dirsum.ts

diff --git a/package.json b/package.json
index 48501fac49..e42234a0dc 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "common-tags": "1.4.0",
     "cross-spawn": "^5.0.0",
     "delocalize-dependencies": "0.1.0",
+    "dirsum": "0.1.1",
     "execa": "0.6.0",
     "exists-file": "3.0.0",
     "find-up": "2.1.0",
diff --git a/src/fs/dirsum.ts b/src/fs/dirsum.ts
new file mode 100644
index 0000000000..f5090c0600
--- /dev/null
+++ b/src/fs/dirsum.ts
@@ -0,0 +1,10 @@
+import dirsum = require('dirsum')
+
+export default function (dirpath: string): Promise<string> {
+  return new Promise((resolve, reject) => {
+    dirsum.digest(dirpath, 'sha1', (err: Error, hashes: {hash: string}) => {
+      if (err) return reject(err)
+      resolve(hashes.hash)
+    })
+  })
+}
diff --git a/src/install/fetch.ts b/src/install/fetch.ts
index 7da810c672..ac06935da8 100644
--- a/src/install/fetch.ts
+++ b/src/install/fetch.ts
@@ -16,6 +16,7 @@ import {InstallContext} from '../api/install'
 import fetchResolution from './fetchResolution'
 import logStatus from '../logging/logInstallStatus'
 import {PackageMeta} from '../resolve/utils/loadPackageMeta'
+import dirsum from '../fs/dirsum'
 
 export type FetchOptions = {
   keypath?: string[],
@@ -198,7 +199,21 @@ function fetchToStoreCached (opts: FetchToStoreOptions): Promise<void> {
       // fs.rename(oldPath, newPath) is an atomic operation, so we do it at the
       // end
       await fs.rename(targetStage, target)
+
+      createShasum(target)
     }
     const pkg = await requireJson(path.join(target, 'package.json'))
   })
 }
+
+async function createShasum(dirPath: string) {
+  try {
+    const shasum = await dirsum(dirPath)
+    await fs.writeFile(`${dirPath}_shasum`, shasum, 'utf8')
+  } catch (err) {
+    logger.error({
+      message: `Failed to calculate shasum for ${dirPath}`,
+      err,
+    })
+  }
+}
diff --git a/typings/local.d.ts b/typings/local.d.ts
index c0ce228983..87f3be8af0 100644
--- a/typings/local.d.ts
+++ b/typings/local.d.ts
@@ -232,3 +232,8 @@ declare module 'p-limit' {
   const anything: any;
   export = anything;
 }
+
+declare module 'dirsum' {
+  const anything: any;
+  export = anything;
+}