Move configuration work to library

Signed-off-by: jcsiadal <jeremy.c.siadal@intel.com>

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

@@ -1,117 +1,10 @@
 package hosts
 
 import (
-	"bytes"
-	"os"
-	"path"
-	"text/template"
-
-	"github.com/hpcng/warewulf/internal/pkg/buildconfig"
-	"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/hpcng/warewulf/internal/pkg/configure"
 	"github.com/spf13/cobra"
 )
 
-type TemplateStruct struct {
-	PrevHostFile string
-	Ipaddr       string
-	Fqdn         string
-	AllNodes     []node.NodeInfo
-}
-
 func CobraRunE(cmd *cobra.Command, args []string) error {
-	return Configure(SetShow)
-}
-
-func Configure(show bool) error {
-	var replace TemplateStruct
-
-	if !util.IsFile(path.Join(buildconfig.SYSCONFDIR(), "warewulf/hosts.tmpl")) {
-		wwlog.Printf(wwlog.WARN, "Template not found, not updating host file\n")
-		return nil
-	}
-
-	controller, err := warewulfconf.New()
-	if err != nil {
-		wwlog.Printf(wwlog.ERROR, "%s\n", err)
-		os.Exit(1)
-	}
-
-	n, err := node.New()
-	if err != nil {
-		wwlog.Printf(wwlog.ERROR, "Could not open node configuration: %s\n", err)
-		os.Exit(1)
-	}
-
-	tmpl, err := template.ParseFiles(path.Join(buildconfig.SYSCONFDIR(), "warewulf/hosts.tmpl"))
-	if err != nil {
-		wwlog.Printf(wwlog.ERROR, "Could not parse hosts template: %s\n", err)
-		os.Exit(1)
-	}
-
-	replace.PrevHostFile = ""
-	w, err := os.Open("/etc/hosts")
-	if err != nil {
-		wwlog.Printf(wwlog.WARN, "%s\n", err)
-	} else {
-		// if /etc/hosts.ww does not exist, backup /etc/hosts to /etc/hosts.wwbackup
-		if !util.IsFile("/etc/hosts.wwbackup") {
-			err = util.CopyFile("/etc/hosts", "/etc/hosts.wwbackup")
-			if err != nil {
-				wwlog.Printf(wwlog.ERROR, "%s\n", err)
-			}
-		}
-
-		// read all lines before the # warewulf comment and put into PrevHostFile template variable
-		lines, _ := util.ReadFile("/etc/hosts")
-		if lines != nil {
-			var buffer bytes.Buffer
-			for _, line := range lines {
-				//wwlog.Printf(wwlog.INFO, "Reading line: %s\n", line)
-				if util.ValidString(line, "^#.*maintained by warewulf") {
-					break
-				}
-				buffer.WriteString(line)
-				buffer.WriteString("\n")
-			}
-			replace.PrevHostFile = buffer.String()
-		}
-	}
-
-	//wwlog.Printf(wwlog.INFO, "PrevHostFile is %s\n", replace.PrevHostFile)
-
-	w.Close()
-
-	nodes, _ := n.FindAllNodes()
-
-	replace.AllNodes = nodes
-	replace.Ipaddr = controller.Ipaddr
-	replace.Fqdn = controller.Fqdn
-
-	if !SetShow {
-		// only open "/etc/hosts" when intended to write, as 'os.O_TRUNC' will empty the file otherwise.
-		w, err = os.OpenFile("/etc/hosts", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
-		if err != nil {
-			wwlog.Printf(wwlog.ERROR, "%s\n", err)
-			os.Exit(1)
-		}
-		defer w.Close()
-
-		err = tmpl.Execute(w, replace)
-		if err != nil {
-			wwlog.Printf(wwlog.ERROR, "%s\n", err)
-			os.Exit(1)
-		}
-	} else {
-		err = tmpl.Execute(os.Stdout, replace)
-		if err != nil {
-			wwlog.Printf(wwlog.ERROR, "%s\n", err)
-			os.Exit(1)
-		}
-
-	}
-
-	return nil
+	return configure.Configure("hosts", setShow)
 }