engine: resources: Make the qemu guest agent automatic

engine/resources/virt_builder.go

@@ -187,7 +187,8 @@ type VirtBuilderRes struct {
 	LogOutput bool `lang:"log_output" yaml:"log_output"`
 
 	// Tweaks adds some random tweaks to work around common bugs. This
-	// defaults to true.
+	// defaults to true. It also does some useful things that most may find
+	// desirable.
 	Tweaks bool `lang:"tweaks" yaml:"tweaks"`
 
 	varDir string
@@ -508,6 +509,12 @@ func (obj *VirtBuilderRes) CheckApply(ctx context.Context, apply bool) (bool, er
 		extraPackages = append(extraPackages, p...)
 	}
 
+	// Magic vm things should happen automatically.
+	if d := obj.getDistro(); obj.Tweaks && (d == "fedora" || d == "debian") {
+		p := "qemu-guest-agent" // same for debian and fedora
+		extraPackages = append(extraPackages, p)
+	}
+
 	if len(obj.Packages) > 0 || len(extraPackages) > 0 {
 		packages := []string{} // I think the ordering _may_ matter.
 		packages = append(packages, obj.Packages...)
@@ -516,6 +523,13 @@ func (obj *VirtBuilderRes) CheckApply(ctx context.Context, apply bool) (bool, er
 		cmdArgs = append(cmdArgs, args...)
 	}
 
+	// Magic vm things should happen automatically.
+	if d := obj.getDistro(); obj.Tweaks && (d == "fedora" || d == "debian") {
+		x := "/usr/bin/systemctl enable qemu-guest-agent.service"
+		args := []string{"--run-command", x}
+		cmdArgs = append(cmdArgs, args...)
+	}
+
 	// XXX: Tweak for debian grub-pc bug:
 	// https://www.mail-archive.com/guestfs@lists.libguestfs.org/msg00062.html
 	if obj.Tweaks && obj.Update && obj.getDistro() == "debian" {