Don't show QEmu window when checking for KVM & check it only for QEmu…

… images

lib/index.js

@@ -14,6 +14,31 @@ const spawnSync = require('child_process').spawnSync
 const processArguments = require('nodeos-barebones/scripts/processArguments')
 
 
+function checkKvm(qemuBin)
+{
+  let contents = ""
+
+  try
+  {
+    contents = fs.readFileSync('/proc/cpuinfo')
+  } catch(e){
+    if(e.code !== 'ENOENT') throw(e)
+
+    return false
+  }
+
+  if(! /(vmx|svm|0xc0f)/.test(contents)) return false
+
+  // We have support for KVM, let's see if QEmu has permissions to use it
+  try
+  {
+    spawnSync(qemuBin, ['-nographic'], {timeout: 1000})
+  } catch(e){
+    return true
+  }
+}
+
+
 function prepareCommandLine(argv, output)
 {
   const args = processArguments(argv)
@@ -44,33 +69,25 @@ function prepareCommandLine(argv, output)
   }
 
   // check if kvm is supported
-  let contents = ""
-
-  try
-  {
-    contents = fs.readFileSync('/proc/cpuinfo')
-  } catch(e){
-    if(e.code !== 'ENOENT') throw(e)
-  }
-
   let timeout_rate = 1
 
-  // We have support for KVM, let's see if QEmu has permissions to use it
-  if(/(vmx|svm|0xc0f)/.test(contents) !== false)
-    try
+  function qemuKvm()
+  {
+    if(checkKvm(command))
     {
-      spawnSync(command, {timeout: 1000})
-    } catch(e){
       argv.push('-enable-kvm')
       timeout_rate = 0.1
     }
+  }
 
   // CWD
   const cwd = join('out', cpu_family, machine, platform)
 
   switch(platform)
   {
     case 'disk':
+      qemuKvm()
+
       argv.push('-hda', 'disk.img')
     break
 
@@ -88,16 +105,22 @@ function prepareCommandLine(argv, output)
     break
 
     case 'img':
+      qemuKvm()
+
       argv.push('-hda', 'bootfs.img',
                 '-hdb', 'usersfs.img')
     break
 
     case 'iso':
+      qemuKvm()
+
       argv.push('-cdrom', 'bootfs.iso',
                 '-hda'  , 'usersfs.img')
     break
 
     case 'qemu':
+      qemuKvm()
+
       const append =
       [
         'root=/dev/sda',