Build leveldown if ia32

Fix #7915

Auditors: @aekeus

leveldown uses prebuild and installs prebuilt binaries.  But it doesn't check the env variable properly, or it was uploaded wrongly.  This forces a rebuild if it is ia32

tools/cibuild.py

@@ -4,7 +4,6 @@
 import subprocess
 import sys
 import os.path
-
 MUON_VERSION = '2.57.6'
 CHROMEDRIVER_VERSION = '2.27'
 SOURCE_ROOT = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
@@ -21,7 +20,6 @@ def execute(argv, env=os.environ):
     print e.output
     raise e
 
-
 def write_npmrc():
   data = 'runtime = node\n' \
   'target_arch = %s\n' \
@@ -72,10 +70,10 @@ def run_script(script, args=[]):
 npm = 'npm.cmd' if is_windows else 'npm'
 execute([npm, 'install'])
 
-if is_darwin:
-  execute(['node', './tools/electronBuilderHack.js'])
+execute(['node', './tools/electronBuilderHack.js'])
+
 # For whatever reason on linux pstinstall webpack isn't running
-elif is_linux:
+if is_linux:
   execute([npm, 'run', 'webpack'])
 
 execute([npm, 'run', 'build-package'])

tools/electronBuilderHack.js

@@ -1,24 +1,40 @@
-var os = require('os')
-var path = require('path')
-var execute = require('./lib/execute')
+const os = require('os')
+const path = require('path')
+const execute = require('./lib/execute')
 
 console.log('Patching electron-builder native modules, please wait...')
 
-var braveGyp = path.join(os.homedir(), '.brave-gyp')
-var env = {
+const braveGyp = path.join(os.homedir(), '.brave-gyp')
+const env = {
   HOME: braveGyp,
   APPDATA: braveGyp
 }
 
-var rebuildCmd = '"../.bin/node-gyp" rebuild'
+const rebuildCmd = '"../.bin/node-gyp" rebuild'
 
-var cmds = [
-  'cp .npmrc ./node_modules/macos-alias',
-  'cp .npmrc ./node_modules/fs-xattr',
-  'cd ./node_modules/macos-alias',
-  rebuildCmd,
-  'cd ../fs-xattr',
-  rebuildCmd
-]
+const isDarwin = process.platform === 'darwin'
+
+const cmds = []
+if (process.env.TARGET_ARCH === 'ia32') {
+  cmds.push(
+    'cp .npmrc ./node_modules/leveldown',
+    'cd ./node_modules/leveldown',
+    // leveldown prebuild isn't respecting the npm_config_arch env
+    // for some reason, so always compile it.
+    'npm run rebuild'
+  )
+}
+
+if (isDarwin) {
+  cmds.push(
+    'cd ..',
+    'cp .npmrc ./node_modules/macos-alias',
+    'cp .npmrc ./node_modules/fs-xattr',
+    'cd ./node_modules/macos-alias',
+    rebuildCmd,
+    'cd ../fs-xattr',
+    rebuildCmd
+  )
+}
 
 execute(cmds, env, console.log.bind(null, 'done'))