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