mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
package etchosts
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"regexp"
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)
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var defaultContent = map[string]string{
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"localhost": "127.0.0.1",
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"localhost ip6-localhost ip6-loopback": "::1",
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"ip6-localnet": "fe00::0",
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"ip6-mcastprefix": "ff00::0",
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"ip6-allnodes": "ff02::1",
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"ip6-allrouters": "ff02::2",
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}
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func Build(path, IP, hostname, domainname string, extraContent *map[string]string) error {
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content := bytes.NewBuffer(nil)
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if IP != "" {
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if domainname != "" {
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content.WriteString(fmt.Sprintf("%s\t%s.%s %s\n", IP, hostname, domainname, hostname))
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} else {
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content.WriteString(fmt.Sprintf("%s\t%s\n", IP, hostname))
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}
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}
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for hosts, ip := range defaultContent {
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if _, err := content.WriteString(fmt.Sprintf("%s\t%s\n", ip, hosts)); err != nil {
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return err
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}
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}
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if extraContent != nil {
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for hosts, ip := range *extraContent {
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if _, err := content.WriteString(fmt.Sprintf("%s\t%s\n", ip, hosts)); err != nil {
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return err
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}
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}
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}
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return ioutil.WriteFile(path, content.Bytes(), 0644)
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}
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func Update(path, IP, hostname string) error {
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old, err := ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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var re = regexp.MustCompile(fmt.Sprintf("(\\S*)(\\t%s)", regexp.QuoteMeta(hostname)))
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return ioutil.WriteFile(path, re.ReplaceAll(old, []byte(IP+"$2")), 0644)
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}
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