// installDockerCerts saves the configured certs to the specified dir
// if and only if the certs are not already placed there. If no certs
// are provided or some certs already exist, nothing is written.
func installDockerCerts(s DockerHandlerSettings, dstDir string) error {
m := []struct {
src string
dst string
}{
{s.Certs.CABase64, filepath.Join(dstDir, dockerCaCert)},
{s.Certs.ServerCertBase64, filepath.Join(dstDir, dockerSrvCert)},
{s.Certs.ServerKeyBase64, filepath.Join(dstDir, dockerSrvKey)},
}
// Check if certs pre rovided
for _, v := range m {
if len(v.src) == 0 {
log.Printf("Docker certificate %s is not provided in the extension settings, skipping docker certs installation", v.dst)
return nil
}
}
// Check if certificate files already exist
for _, v := range m {
if ok, err := util.PathExists(v.dst); err != nil {
return fmt.Errorf("error examining path %s: %v", v.dst, err)
} else if ok {
log.Printf("%s already exists, skipping installing certificates", v.dst)
return nil
}
}
// Check the target directory, if not create
if ok, err := util.PathExists(dstDir); err != nil {
return fmt.Errorf("error checking cert dir: %v", err)
} else if !ok {
if err := os.MkdirAll(dstDir, 0755); err != nil {
return err
}
}
// Write the certs
for _, v := range m {
// Decode base64
f, err := base64.StdEncoding.DecodeString(strings.TrimSpace(v.src))
if err != nil {
return fmt.Errorf("error decoding base64 cert contents: %v", err)
}
if err := ioutil.WriteFile(v.dst, f, 0600); err != nil {
return fmt.Errorf("error writing certificate: %v", err)
}
}
return nil
}
// installCompose download docker-compose and saves to a predetermined path.
func installCompose(dir string) error {
// Create dir if not exists
ok, err := util.PathExists(dir)
if err != nil {
return err
} else if !ok {
if err := os.MkdirAll(dir, 755); err != nil {
return err
}
}
log.Printf("Downloading compose from %s", composeUrl)
resp, err := http.Get(composeUrl)
if err != nil {
return fmt.Errorf("error downloading docker-compose: %v", err)
}
if resp.StatusCode/100 != 2 {
return fmt.Errorf("response status code from %s: %s", composeUrl, resp.Status)
}
defer resp.Body.Close()
fp := filepath.Join(dir, composeBin)
f, err := os.OpenFile(fp, os.O_RDWR|os.O_CREATE, 0777)
if err != nil {
return fmt.Errorf("error creating %s: %v", fp, err)
}
defer f.Close()
if _, err := io.Copy(f, resp.Body); err != nil {
return fmt.Errorf("failed to save response body to %s: %v", fp, err)
}
return nil
}