install: Ignore shrinkwrap when --no-shrinkwrap is set

Author: isaacs

doc/cli/config.md

@@ -721,6 +721,14 @@ character to indicate reverse sort.
 
 The shell to run for the `npm explore` command.
 
+### shrinkwrap
+
+* Default: true
+* Type: Boolean
+
+If set to false, then ignore `npm-shrinkwrap.json` files when
+installing.
+
 ### sign-git-tag
 
 * Default: false

lib/install.js

@@ -250,6 +250,10 @@ function readDependencies (context, where, opts, cb) {
       })
     }
 
+    // User has opted out of shrinkwraps entirely
+    if (npm.config.get("shrinkwrap") === false)
+      return cb(null, data, null)
+
     if (wrap) {
       log.verbose("readDependencies: using existing wrap", [where, wrap])
       var rv = {}