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add etchosts

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Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
This commit is contained in:
Victor Vieux 2014-05-05 22:05:14 +00:00
parent ecd6b47eaf
commit 05227e1d6f
3 changed files with 109 additions and 0 deletions
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1
networkfs/MAINTAINERS Normal file
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@ -0,0 +1 @@
Victor Vieux <victor.vieux@docker.com> (@vieux)

34
networkfs/etchosts/etchosts.go Normal file
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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)
}

74
networkfs/etchosts/etchosts_test.go Normal file
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package etchosts
import (
"bytes"
"io/ioutil"
"os"
"testing"
)
func TestBuildHostnameDomainname(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "10.11.12.13", "testhostname", "testdomainname")
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "10.11.12.13\ttesthostname.testdomainname testhostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func TestBuildHostname(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "10.11.12.13", "testhostname", "")
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "10.11.12.13\ttesthostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func TestBuildNoIP(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "testhostname", "")
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := ""; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}