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moby--moby/pkg/apparmor/setup.go

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package apparmor
import (
"fmt"
"io"
"os"
"os/exec"
"path"
)
const (
DefaultProfilePath = "/etc/apparmor.d/docker"
)
func InstallDefaultProfile(backupPath string) error {
if !IsEnabled() {
return nil
}
// If the profile already exists, check if we already have a backup
// if not, do the backup and override it. (docker 0.10 upgrade changed the apparmor profile)
// see gh#5049, apparmor blocks signals in ubuntu 14.04
if _, err := os.Stat(DefaultProfilePath); err == nil {
if _, err := os.Stat(backupPath); err == nil {
// If both the profile and the backup are present, do nothing
return nil
}
// Make sure the directory exists
if err := os.MkdirAll(path.Dir(backupPath), 0755); err != nil {
return err
}
// Create the backup file
f, err := os.Create(backupPath)
if err != nil {
return err
}
defer f.Close()
src, err := os.Open(DefaultProfilePath)
if err != nil {
return err
}
defer src.Close()
if _, err := io.Copy(f, src); err != nil {
return err
}
}
// Make sure /etc/apparmor.d exists
if err := os.MkdirAll(path.Dir(DefaultProfilePath), 0755); err != nil {
return err
}
f, err := os.OpenFile(DefaultProfilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
if err := generateProfile(f); err != nil {
f.Close()
return err
}
f.Close()
cmd := exec.Command("/sbin/apparmor_parser", "-r", "-W", "docker")
// to use the parser directly we have to make sure we are in the correct
// dir with the profile
cmd.Dir = "/etc/apparmor.d"
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("Error loading docker apparmor profile: %s (%s)", err, output)
}
return nil
}