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-rw-r--r--pkg/spec/createconfig.go31
1 files changed, 31 insertions, 0 deletions
diff --git a/pkg/spec/createconfig.go b/pkg/spec/createconfig.go
index 25f8cd7a1..ffc98e307 100644
--- a/pkg/spec/createconfig.go
+++ b/pkg/spec/createconfig.go
@@ -2,6 +2,7 @@ package createconfig
import (
"encoding/json"
+ "fmt"
"net"
"os"
"strconv"
@@ -145,6 +146,36 @@ func (c *CreateConfig) CreateBlockIO() (*spec.LinuxBlockIO, error) {
return c.createBlockIO()
}
+// AddContainerInitBinary adds the init binary specified by path iff the
+// container will run in a private PID namespace that is not shared with the
+// host or another pre-existing container, where an init-like process is
+// already running.
+//
+// Note that AddContainerInitBinary prepends "/dev/init" "--" to the command
+// to execute the bind-mounted binary as PID 1.
+func (c *CreateConfig) AddContainerInitBinary(path string) error {
+ if path == "" {
+ return fmt.Errorf("please specify a path to the container-init binary")
+ }
+ if !c.PidMode.IsPrivate() {
+ return fmt.Errorf("cannot add init binary as PID 1 (PID namespace isn't private)")
+ }
+ if c.Systemd {
+ return fmt.Errorf("cannot use container-init binary with systemd")
+ }
+ if _, err := os.Stat(path); os.IsNotExist(err) {
+ return errors.Wrap(err, "container-init binary not found on the host")
+ }
+ c.Command = append([]string{"/dev/init", "--"}, c.Command...)
+ c.Mounts = append(c.Mounts, spec.Mount{
+ Destination: "/dev/init",
+ Type: "bind",
+ Source: path,
+ Options: []string{"bind", "ro"},
+ })
+ return nil
+}
+
func processOptions(options []string) []string {
var (
foundrw, foundro bool