GUI: show error windows

Signed-off-by: Jeff Carr <jcarr@wit.com>

apt.go

@@ -11,13 +11,14 @@ func aptGroup(tab *gui.Node) {
 	n.AddButton("update apt-file", func (*gui.Node) {
 		// shell.Script("apt -y install apt-file\napt-file update")
 		// xterm("apt -y install apt-file; apt-file update")
-		n.ErrorWindow("test error window", "this is the error")
+		// gui.ErrorWindow("test error window", "this is the error")
 		err := sudo( func() error {
 			err := bash("apt install moon-buggy")
 			return err
 		})
 		if (err != nil) {
-			panic("bash failed")
+			gui.ErrorWindow("Error", "Failed to run:\napt install moon-buggy")
+			return
 		}
 		err = bash("bash -x /tmp/jcarr")
 		bash("apt -y install apt-file")

os.go

@@ -8,6 +8,7 @@ import "io/ioutil"
 import "errors"
 import "bufio"
 
+import "git.wit.org/wit/gui"
 import "github.com/davecgh/go-spew/spew"
 
 /*
@@ -135,8 +136,10 @@ func bash(cmdline string) error {
 
 func sudo(f func() error) error {
 	uid := os.Getuid()
-	log.Println("You must be root to do this. uid =", uid)
+	e := "You must be root to do this."
+	log.Println(e, "uid =", uid)
 	if (uid != 0) {
+		gui.ErrorWindow("Permissions Failed", e)
 		return errors.New("not root")
 	}
 	err := f()

window-resolv.go

@@ -7,7 +7,7 @@ import "strings"
 import "errors"
 import "git.wit.org/wit/gui"
 
-var filename string = ""
+var filename string = "resolv-1-1-1-1.conf"
 
 func resolvWindow(w *gui.Node) {
 	if (w == nil) {
@@ -35,7 +35,7 @@ func resolvWindow(w *gui.Node) {
 
 	resolvNode := gNode.AddComboBox("test", tmp...)
 
-	resolvNode.SetText("resolv-1-1-1-1.conf")
+	resolvNode.SetText(filename)
 	resolvNode.OnChanged = func () {
 		log.Println("STARTED HOSTNAME")
 		filename = resolvNode.GetText()