[gnome-boxes] main: make --checks check for libvirt kvm

[Marc-Andre Lureau <malureau src gnome org>]

commit ffecefd3fd63497d7b4325a112cc266ff4a08f78
Author: Marc-Andrà Lureau <marcandre lureau gmail com>
Date:   Fri Aug 3 16:35:17 2012 +0200

    main: make --checks check for libvirt kvm
    
    Add check_libvirt_kvm () to check if we have the kvm capability on
    qemu:///session.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=681142

 src/main.vala |    9 ++++++---
 src/util.vala |   19 +++++++++++++++++++
 2 files changed, 25 insertions(+), 3 deletions(-)
---
diff --git a/src/main.vala b/src/main.vala
index 5a041ba..20a9934 100644
--- a/src/main.vala
+++ b/src/main.vala
@@ -54,15 +54,19 @@ private static void parse_args (ref unowned string[] args) {
 }
 
 private async void run_checks () {
+    string selinux_context_diagnosis = "";
+
+    // FIXME do all this in parallel, but how?
     var cpu = yield Boxes.check_cpu_vt_capability ();
     var kvm = yield Boxes.check_module_kvm_loaded ();
-
-    string selinux_context_diagnosis = "";
+    var libvirt_kvm = yield Boxes.check_libvirt_kvm ();
     var selinux_context_default = yield Boxes.check_selinux_context_default (out selinux_context_diagnosis);
 
     // FIXME: add proper UI & docs
     GLib.stdout.printf (N_("â The CPU is capable of virtualization: %s\n").printf (Boxes.yes_no (cpu)));
     GLib.stdout.printf (N_("â The KVM module is loaded: %s\n").printf (Boxes.yes_no (kvm)));
+    GLib.stdout.printf (N_("â Libvirt KVM guest available: %s\n").printf (Boxes.yes_no (libvirt_kvm)));
+
     GLib.stdout.printf (N_("â The SELinux context is default: %s\n").printf (Boxes.yes_no (selinux_context_default)));
     if (selinux_context_diagnosis.length != 0)
         GLib.stdout.printf (Boxes.indent ("    ", selinux_context_diagnosis) + "\n");
@@ -119,4 +123,3 @@ public int main (string[] args) {
 
     return app.run ();
 }
-
diff --git a/src/util.vala b/src/util.vala
index 9a85f5a..5e60620 100644
--- a/src/util.vala
+++ b/src/util.vala
@@ -445,6 +445,25 @@ namespace Boxes {
         return false;
     }
 
+    public async bool check_libvirt_kvm () {
+        try {
+            string standard_output;
+
+            string[] argv = {"virsh", "capabilities"};
+
+            yield exec (argv, null, out standard_output);
+            var kvm = extract_xpath (standard_output, "string(/capabilities/guest[os_type='hvm']/arch/domain[ type='kvm']/emulator)");
+            return kvm.length != 0;
+
+        } catch (GLib.SpawnError.NOEXEC error) {
+            critical ("libvirt is not installed correctly");
+        } catch (GLib.Error error) {
+            warning (error.message);
+        }
+
+        return false;
+    }
+
     public async bool check_cpu_vt_capability () {
         var result = false;
         var file = File.new_for_path ("/proc/cpuinfo");