moby--moby/pkg/networkfs/etchosts/etchosts.go

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package etchosts
import (
"bytes"
"fmt"
"io/ioutil"
)
var defaultContent = map[string]string{
"localhost": "127.0.0.1",
"localhost ip6-localhost ip6-loopback": "::1",
"ip6-localnet": "fe00::0",
"ip6-mcastprefix": "ff00::0",
"ip6-allnodes": "ff02::1",
"ip6-allrouters": "ff02::2",
}
func Build(path, IP, hostname, domainname string) error {
content := bytes.NewBuffer(nil)
if IP != "" {
if domainname != "" {
content.WriteString(fmt.Sprintf("%s\t%s.%s %s\n", IP, hostname, domainname, hostname))
} else {
content.WriteString(fmt.Sprintf("%s\t%s\n", IP, hostname))
}
}
for hosts, ip := range defaultContent {
if _, err := content.WriteString(fmt.Sprintf("%s\t%s\n", ip, hosts)); err != nil {
return err
}
}
return ioutil.WriteFile(path, content.Bytes(), 0644)
}