Remove Cordova project directory when it contains outdated platforms

Although we remove the Cordova project directory when upgrading to
Meteor 1.2, this only happens once per project, and the
.meteor/local/cordova-build directory is usually ignored, and thus
preserved per machine. This means we can’t avoid checking for outdated
platforms on every run to make sure we remove the directory when needed.

tools/cordova/project.js

@@ -3,6 +3,7 @@ import util from 'util';
 import path from 'path';
 import assert from 'assert';
 import chalk from 'chalk';
+import semver from 'semver';
 
 import isopackets from '../tool-env/isopackets.js'
 import files from '../fs/files.js';
@@ -59,6 +60,33 @@ yet supported.`);
   createIfNeeded() {
     buildmessage.assertInJob();
 
+    // Check if we have an existing Cordova project directory with outdated
+    // platforms. In that case, we remove the whole directory to avoid issues.
+    if (files.exists(this.projectRoot)) {
+      const platformVersions = this.listInstalledPlatformVersions();
+
+      // XXX Decide whether to update these if we update cordova-lib.
+      // If we can guarantee there are no issues going forward, we may want to
+      // use updatePlatforms instead of removing the whole directory.
+      const minPlatformVersions = {
+        'android': '4.1.0',
+        'ios': '3.9.0'
+      }
+
+      const outdated = _.some(minPlatformVersions, (minVersion, platform) => {
+        const version = platformVersions[platform];
+        return version && semver.lt(version, minVersion);
+      });
+
+      if (outdated) {
+        Console.debug(`Removing Cordova project directory to avoid issues with
+outdated platforms`);
+        // Remove Cordova project directory to start afresh
+        // and avoid a broken project
+        files.rm_recursive(this.projectRoot);
+      }
+    }
+
     if (!files.exists(this.projectRoot)) {
       // We create a temporary directory with a generated config.xml
       // to use as a template for creating the Cordova project
@@ -172,7 +200,7 @@ ${displayNameForPlatform(platform)} with options ${options}`,
       cwd: this.projectRoot,
       stdio: Console.verbose ? 'inherit' : 'pipe',
       waitForClose: false })
-    );
+    ), null, null;
   }
 
   // Platforms
@@ -262,6 +290,21 @@ the status of individual requirements.");
     return cordova_util.listPlatforms(files.convertToOSPath(this.projectRoot));
   }
 
+  listInstalledPlatformVersions() {
+    let platformVersions = {};
+    this.runCommands(`listing platform versions in Cordova project`, async () => {
+      for (let platform of this.listInstalledPlatforms()) {
+        const command = files.convertToOSPath(files.pathJoin(
+          this.projectRoot, 'platforms', platform, 'cordova', 'version'));
+        const platformVersion = await execFileSync(command, {
+          env: this.defaultEnvWithPathsAdded(),
+          cwd: this.projectRoot})
+        platformVersions[platform] = platformVersion;
+      }
+    }, null, null);
+    return platformVersions;
+  }
+
   updatePlatforms(platforms = this.listInstalledPlatforms()) {
     this.runCommands(`updating Cordova project for platforms \
 ${displayNamesForPlatforms(platforms)}`, async () => {