SMuRy5ZL

1package main
2
3import (
4    "flag"
5    "fmt"
6    "io/ioutil"
7    "net"
8    "strings"
9)
10
11var nic, ip, gateway, ns, filename string
12
13func main() {
14    flag.StringVar(&filename, "f", "xyz", "Enter the filename ")
15    flag.StringVar(&nic, "interface", "eth0", "Enter the Ethernet Card (for example : 'ens0N' or 'eth0') ")
16    flag.StringVar(&ip, "ip", "192.168.1.122", "Enter the IP address along with the DNS in the format xxx.xxx.x.xxx/yy")
17    flag.StringVar(&gateway, "gateway", "192.168.0.1", "Enter the gateway in the format xxx.xxx.x.x")
18    flag.StringVar(&ns, "DNS", "8.8.8.8,8.8.4.4", "Enter the nameservers seperated by comma(,) in the format x.x.x.x,y.y.y.y")
19    flag.Parse()
20    testInput := net.ParseIP(ip)
21    if testInput.To4() == nil {
22        fmt.Printf("%v is not a valid IPv4 addressn", testInput)
23    } else {
24        fmt.Printf("It is a valid IP addressn")
25
26        b, err := ioutil.ReadFile("01-network-manager-all.yaml") // just pass the file name
27        if err != nil {
28            fmt.Print(err)
29        }
30        str := string(b) // convert content to a 'string'
31
32        // Create replacer with pairs as arguments.
33        r := strings.NewReplacer("{interface}", nic,
34            "IPaddress", ip,
35            "{gateway}", gateway,
36            "DNS", ns)
37
38        // Replace all pairs.
39        result := r.Replace(str)
40        fmt.Println(result)
41        newContents := []byte(result)
42        err = ioutil.WriteFile("newtemplate.yaml", newContents, 0664)
43        if err != nil {
44            panic(err)
45        }
46    }
47}