readded configure hostfile command

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

@@ -0,0 +1,10 @@
+package hostfile
+
+import (
+	"github.com/hpcng/warewulf/internal/pkg/configure"
+	"github.com/spf13/cobra"
+)
+
+func CobraRunE(cmd *cobra.Command, args []string) error {
+	return configure.Hostfile()
+}

internal/app/wwctl/configure/hostfile/root.go

@@ -0,0 +1,21 @@
+package hostfile
+
+import "github.com/spf13/cobra"
+
+var (
+	baseCmd = &cobra.Command{
+		DisableFlagsInUseLine: true,
+		Use:                   "hostfile  [OPTIONS]",
+		Short:                 "update hostfile on master",
+		Long:                  "Manage the hostfile on the master node\n",
+		RunE:                  CobraRunE,
+	}
+)
+
+func init() {
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}

internal/app/wwctl/configure/main.go

@@ -34,6 +34,12 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 			wwlog.Printf(wwlog.ERROR, "%s\n", err)
 			os.Exit(1)
 		}
+		err = configure.Hostfile()
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "%s\n", err)
+			os.Exit(1)
+		}
+
 	} else {
 		_ = cmd.Help()
 		os.Exit(0)

internal/app/wwctl/configure/root.go

@@ -2,6 +2,7 @@ package configure
 
 import (
 	"github.com/hpcng/warewulf/internal/app/wwctl/configure/dhcp"
+	"github.com/hpcng/warewulf/internal/app/wwctl/configure/hostfile"
 	"github.com/hpcng/warewulf/internal/app/wwctl/configure/nfs"
 	"github.com/hpcng/warewulf/internal/app/wwctl/configure/ssh"
 	"github.com/hpcng/warewulf/internal/app/wwctl/configure/tftp"
@@ -25,6 +26,8 @@ func init() {
 	baseCmd.AddCommand(tftp.GetCommand())
 	baseCmd.AddCommand(ssh.GetCommand())
 	baseCmd.AddCommand(nfs.GetCommand())
+	baseCmd.AddCommand(hostfile.GetCommand())
+
 	baseCmd.PersistentFlags().BoolVarP(&allFunctions, "all", "a", false, "Configure all services")
 }
 

internal/pkg/configure/hostfile.go

@@ -0,0 +1,46 @@
+package configure
+
+import (
+	"os"
+	"path"
+
+	"github.com/hpcng/warewulf/internal/pkg/node"
+	"github.com/hpcng/warewulf/internal/pkg/overlay"
+	"github.com/hpcng/warewulf/internal/pkg/util"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"github.com/pkg/errors"
+)
+
+/*
+Creates '/etc/hosts' from the host template.
+*/
+func Hostfile() error {
+	if !(util.IsFile(path.Join(overlay.OverlaySourceDir("host"), "/host/etc/hosts.ww"))) {
+		wwlog.Error("'the overlay template '/etc/hosts.ww' does not exists in 'host' overlay\n")
+		os.Exit(1)
+	}
+	var nodeInfo node.NodeInfo
+	tstruct := overlay.InitStruct(nodeInfo)
+	hostname, _ := os.Hostname()
+	nodeInfo.Id.Set(hostname)
+	buffer, backupFile, writeFile, err := overlay.RenderTemplateFile(
+		path.Join(overlay.OverlaySourceDir("host"), "/host/etc/hosts.ww"),
+		tstruct)
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "%s\n", err)
+		os.Exit(1)
+	}
+	info, err := os.Stat(path.Join(overlay.OverlaySourceDir("host"), "/host/etc/hosts.ww"))
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "%s\n", err)
+		os.Exit(1)
+	}
+
+	if writeFile {
+		err = overlay.CarefulWriteBuffer("/etc/hosts", buffer, backupFile, info.Mode())
+		if err != nil {
+			return errors.Wrap(err, "could not write file from template")
+		}
+	}
+	return nil
+}

internal/pkg/overlay/overlay.go

@@ -260,7 +260,7 @@ func BuildOverlayIndir(nodeInfo node.NodeInfo, overlayNames []string, outputDir
 						if len(filenameFromTemplate) != 0 {
 							wwlog.Debug("Found multifile comment, new filename %s", filenameFromTemplate[0][1])
 							if foundFileComment {
-								err = carefulWriteBuffer(path.Join(outputDir, destFileName),
+								err = CarefulWriteBuffer(path.Join(outputDir, destFileName),
 									fileBuffer, backupFile, info.Mode())
 								if err != nil {
 									return errors.Wrap(err, "could not write file from template")
@@ -277,7 +277,7 @@ func BuildOverlayIndir(nodeInfo node.NodeInfo, overlayNames []string, outputDir
 							_, _ = fileBuffer.WriteString(line)
 						}
 					}
-					err = carefulWriteBuffer(path.Join(outputDir, destFileName), fileBuffer, backupFile, info.Mode())
+					err = CarefulWriteBuffer(path.Join(outputDir, destFileName), fileBuffer, backupFile, info.Mode())
 					if err != nil {
 						return errors.Wrap(err, "could not write file from template")
 					}
@@ -335,7 +335,7 @@ func BuildOverlayIndir(nodeInfo node.NodeInfo, overlayNames []string, outputDir
 /*
 Writes buffer to the destination file. If wwbackup is set a wwbackup will be created.
 */
-func carefulWriteBuffer(destFile string, buffer bytes.Buffer, backupFile bool, perm fs.FileMode) error {
+func CarefulWriteBuffer(destFile string, buffer bytes.Buffer, backupFile bool, perm fs.FileMode) error {
 	wwlog.Debug("Trying to careful write file (%d bytes): %s", buffer.Len(), destFile)
 	if backupFile {
 		if !util.IsFile(destFile+".wwbackup") && util.IsFile(destFile) {