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Update /etc/hosts when linked container is restarted

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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 2014-07-14 23:19:37 +00:00 • committed by Erik Hollensbe
parent 241f52bc17
commit 527e568217
2 changed files with 44 additions and 0 deletions
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10
networkfs/etchosts/etchosts.go
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@ -4,6 +4,7 @@ import (
"bytes"
"fmt"
"io/ioutil"
"regexp"
)
var defaultContent = map[string]string{
@ -41,3 +42,12 @@ func Build(path, IP, hostname, domainname string, extraContent *map[string]strin
return ioutil.WriteFile(path, content.Bytes(), 0644)
}
func Update(path, IP, hostname string) error {
old, err := ioutil.ReadFile(path)
if err != nil {
return err
}
var re = regexp.MustCompile(fmt.Sprintf("(\\S*)(\\t%s)", regexp.QuoteMeta(hostname)))
return ioutil.WriteFile(path, re.ReplaceAll(old, []byte(IP+"$2")), 0644)
}