Add a debug log entry in DHCP before fetching the bootspec.

Adding this line lets us time the bootspec retrieval by comparing
the timestamps of "Got valid request..." and "Offering to boot..."

pixiecore/dhcp.go

@@ -42,6 +42,8 @@ func (s *Server) serveDHCP(conn *dhcp4.Conn) error {
 			continue
 		}
 
+		s.debug("DHCP", "Got valid request to boot %s (%s)", mach.MAC, mach.Arch)
+
 		spec, err := s.Booter.BootSpec(mach)
 		if err != nil {
 			s.log("DHCP", "Couldn't get bootspec for %s: %s", pkt.HardwareAddr, err)

pixiecore/pixiecore.go

@@ -53,6 +53,17 @@ const (
 	ArchX64
 )
 
+func (a Architecture) String() string {
+	switch a {
+	case ArchIA32:
+		return "IA32"
+	case ArchX64:
+		return "X64"
+	default:
+		return "Unknown architecture"
+	}
+}
+
 // A Machine describes a machine that is attempting to boot.
 type Machine struct {
 	MAC  net.HardwareAddr