From 113e1a3af2f487c753b8871d51924682283c89fc Mon Sep 17 00:00:00 2001
From: Rebecca Turner <me@re-becca.org>
Date: Tue, 1 May 2018 15:53:03 -0700
Subject: [PATCH] inflate-shrinkwrap: Infer versions from tarballs to self heal

Credit: @iarna
---
 lib/install/inflate-shrinkwrap.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/lib/install/inflate-shrinkwrap.js b/lib/install/inflate-shrinkwrap.js
index ef1018faa21f1..06a41191ad7bf 100644
--- a/lib/install/inflate-shrinkwrap.js
+++ b/lib/install/inflate-shrinkwrap.js
@@ -69,6 +69,26 @@ function normalizePackageDataNoErrors (pkg) {
   }
 }
 
+function quotemeta (str) {
+  return str.replace(/([^A-Za-z_0-9/])/g, '\\$1')
+}
+
+function tarballToVersion (name, tb) {
+  const registry = quotemeta(npm.config.get('registry'))
+    .replace(/https?:/, 'https?:')
+    .replace(/([^/])$/, '$1/')
+  let matchRegTarball
+  if (name) {
+    const nameMatch = quotemeta(name)
+    matchRegTarball = new RegExp(`^${registry}${nameMatch}/-/${nameMatch}-(.*)[.]tgz$`)
+  } else {
+    matchRegTarball = new RegExp(`^${registry}(.*)?/-/\\1-(.*)[.]tgz$`)
+  }
+  const match = tb.match(matchRegTarball)
+  if (!match) return
+  return match[2] || match[1]
+}
+
 function inflatableChild (onDiskChild, name, topPath, tree, sw, requested, opts) {
   validate('OSSOOOO|ZSSOOOO', arguments)
   const usesIntegrity = (
@@ -76,6 +96,12 @@ function inflatableChild (onDiskChild, name, topPath, tree, sw, requested, opts)
     requested.type === 'remote' ||
     requested.type === 'file'
   )
+  const regTarball = tarballToVersion(name, sw.version)
+  if (regTarball) {
+    sw.resolved = sw.version
+    sw.version = regTarball
+  }
+  if (sw.requires) Object.keys(sw.requires).map((_) => { sw.requires[_] = tarballToVersion(_, sw.requires[_]) || sw.requires[_] })
   const modernLink = requested.type === 'directory' && !sw.from
   if (hasModernMeta(onDiskChild) && childIsEquivalent(sw, requested, onDiskChild)) {
     // The version on disk matches the shrinkwrap entry.