Cleanups and minor fixups

internal/app/wwctl/configure/dhcp/main.go

@@ -0,0 +1,140 @@
+package dhcp
+
+import (
+	"fmt"
+	"github.com/brotherpowers/ipsubnet"
+	"github.com/hpcng/warewulf/internal/pkg/node"
+	"github.com/hpcng/warewulf/internal/pkg/util"
+	"github.com/hpcng/warewulf/internal/pkg/warewulfconf"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"github.com/spf13/cobra"
+	"net"
+	"os"
+	"path"
+	"strings"
+	"text/template"
+)
+
+type dhcpTemplate struct {
+	Ipaddr     string
+	RangeStart string
+	RangeEnd   string
+	Network    string
+	Netmask    string
+	Nodes      []node.NodeInfo
+}
+
+func CobraRunE(cmd *cobra.Command, args []string) error {
+	return Configure(SetShow)
+}
+
+func Configure(show bool) error {
+	var d dhcpTemplate
+	var templateFile string
+
+	nodeDB, err := node.New()
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "Could not open node configuration: %s\n", err)
+		os.Exit(1)
+	}
+
+	controller, err := warewulfconf.New()
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "%s\n", err)
+		os.Exit(1)
+	}
+
+	if controller.Ipaddr == "" {
+		wwlog.Printf(wwlog.ERROR, "The Warewulf IP Address is not properly configured\n")
+		os.Exit(1)
+	}
+
+	if controller.Netmask == "" {
+		wwlog.Printf(wwlog.ERROR, "The Warewulf Netmask is not properly configured\n")
+		os.Exit(1)
+	}
+
+	if controller.Dhcp.Enabled == false {
+		wwlog.Printf(wwlog.INFO, "This system is not configured as a Warewulf DHCP controller\n")
+		os.Exit(1)
+	}
+
+	if controller.Dhcp.RangeStart == "" {
+		wwlog.Printf(wwlog.ERROR, "Configuration is not defined: `dhcpd range start`\n")
+		os.Exit(1)
+	}
+
+	if controller.Dhcp.RangeEnd == "" {
+		wwlog.Printf(wwlog.ERROR, "Configuration is not defined: `dhcpd range end`\n")
+		os.Exit(1)
+	}
+
+	if controller.Dhcp.ConfigFile == "" {
+		controller.Dhcp.ConfigFile = "/etc/dhcp/dhcpd.conf"
+	}
+
+	nodes, err := nodeDB.FindAllNodes()
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "Could not find all controllers: %s\n", err)
+		os.Exit(1)
+	}
+
+	for _, node := range nodes {
+		d.Nodes = append(d.Nodes, node)
+	}
+
+	if controller.Dhcp.Template == "" {
+		templateFile = "/etc/warewulf/dhcp/default-dhcpd.conf"
+	} else {
+		if strings.HasPrefix(controller.Dhcp.Template, "/") {
+			templateFile = controller.Dhcp.Template
+		} else {
+			templateFile = fmt.Sprintf("/etc/warewulf/dhcp/%s-dhcpd.conf", controller.Dhcp.Template)
+		}
+	}
+
+	tmpl, err := template.New(path.Base(templateFile)).ParseFiles(templateFile)
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "%s\n", err)
+		os.Exit(1)
+	}
+
+	mask := net.IPMask(net.ParseIP(controller.Netmask).To4())
+	size, _ := mask.Size()
+
+	sub := ipsubnet.SubnetCalculator(controller.Ipaddr, size)
+
+	d.Ipaddr = controller.Ipaddr
+	d.Network = sub.GetNetworkPortion()
+	d.Netmask = sub.GetSubnetMask()
+	d.RangeStart = controller.Dhcp.RangeStart
+	d.RangeEnd = controller.Dhcp.RangeEnd
+
+	if show == false {
+		fmt.Printf("Writing the DHCP configuration file\n")
+		configWriter, err := os.OpenFile(controller.Dhcp.ConfigFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0640)
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "%s\n", err)
+			os.Exit(1)
+		}
+		defer configWriter.Close()
+		err = tmpl.Execute(configWriter, d)
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "%s\n", err)
+			os.Exit(1)
+		}
+
+		fmt.Printf("Enabling and restarting the DHCP services\n")
+		util.SystemdStart(controller.Dhcp.SystemdName)
+
+	} else {
+		err = tmpl.Execute(os.Stdout, d)
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "%s\n", err)
+			os.Exit(1)
+		}
+
+	}
+
+	return nil
+}