Fix netrc one-line parsing and enforce dummy login writes

internal/netrc/netrc.go

@@ -93,23 +93,34 @@ func parse(path string) ([]entry, error) {
 		}
 
 		fields := strings.Fields(line)
-		if len(fields) < 2 {
-			continue
-		}
-
-		switch fields[0] {
-		case "machine":
-			if current != nil {
-				entries = append(entries, *current)
-			}
-			current = &entry{machine: fields[1]}
-		case "login":
-			if current != nil {
-				current.login = fields[1]
-			}
-		case "password":
-			if current != nil {
-				current.password = fields[1]
+		for i := 0; i < len(fields); {
+			switch fields[i] {
+			case "machine":
+				if i+1 >= len(fields) {
+					i++
+					continue
+				}
+				if current != nil {
+					entries = append(entries, *current)
+				}
+				current = &entry{machine: fields[i+1]}
+				i += 2
+			case "login":
+				if current != nil && i+1 < len(fields) {
+					current.login = fields[i+1]
+					i += 2
+					continue
+				}
+				i++
+			case "password":
+				if current != nil && i+1 < len(fields) {
+					current.password = fields[i+1]
+					i += 2
+					continue
+				}
+				i++
+			default:
+				i++
 			}
 		}
 	}
@@ -130,11 +141,12 @@ func write(path string, entries []entry) error {
 	}
 
 	var b strings.Builder
-	for i, e := range entries {
-		if i > 0 {
-			b.WriteString("\n")
+	for _, e := range entries {
+		login := e.login
+		if login == "" {
+			login = "dummy"
 		}
-		fmt.Fprintf(&b, "machine %s\nlogin %s\npassword %s\n", e.machine, e.login, e.password)
+		fmt.Fprintf(&b, "machine %s login %s password %s\n", e.machine, login, e.password)
 	}
 
 	if err := os.WriteFile(path, []byte(b.String()), 0600); err != nil {