Move envconfig generation to lxc driver

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

daemon/container.go

@@ -168,19 +168,6 @@ func (container *Container) WriteHostConfig() (err error) {
 	return ioutil.WriteFile(container.hostConfigPath(), data, 0666)
 }
 
-func (container *Container) generateEnvConfig(env []string) error {
-	data, err := json.Marshal(env)
-	if err != nil {
-		return err
-	}
-	p, err := container.EnvConfigPath()
-	if err != nil {
-		return err
-	}
-	ioutil.WriteFile(p, data, 0600)
-	return nil
-}
-
 func (container *Container) Attach(stdin io.ReadCloser, stdinCloser io.Closer, stdout io.Writer, stderr io.Writer) chan error {
 	var cStdout, cStderr io.ReadCloser
 
@@ -422,15 +409,10 @@ func (container *Container) Start() (err error) {
 	if err != nil {
 		return err
 	}
-	env := container.createDaemonEnvironment(linkedEnv)
-	// TODO: This is only needed for lxc so we should look for a way to
-	// remove this dep
-	if err := container.generateEnvConfig(env); err != nil {
-		return err
-	}
 	if err := container.setupWorkingDirectory(); err != nil {
 		return err
 	}
+	env := container.createDaemonEnvironment(linkedEnv)
 	if err := populateCommand(container, env); err != nil {
 		return err
 	}
@@ -851,22 +833,6 @@ func (container *Container) jsonPath() string {
 	return path.Join(container.root, "config.json")
 }
 
-func (container *Container) EnvConfigPath() (string, error) {
-	p := path.Join(container.root, "config.env")
-	if _, err := os.Stat(p); err != nil {
-		if os.IsNotExist(err) {
-			f, err := os.Create(p)
-			if err != nil {
-				return "", err
-			}
-			f.Close()
-		} else {
-			return "", err
-		}
-	}
-	return p, nil
-}
-
 // This method must be exported to be used from the lxc template
 // This directory is only usable when the container is running
 func (container *Container) RootfsPath() string {

daemon/execdriver/lxc/driver.go

@@ -1,6 +1,7 @@
 package lxc
 
 import (
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -85,6 +86,9 @@ func (d *driver) Run(c *execdriver.Command, pipes *execdriver.Pipes, startCallba
 	if err := execdriver.SetTerminal(c, pipes); err != nil {
 		return -1, err
 	}
+	if err := d.generateEnvConfig(c); err != nil {
+		return -1, err
+	}
 	configPath, err := d.generateLXCConfig(c)
 	if err != nil {
 		return -1, err
@@ -416,3 +420,14 @@ func (d *driver) generateLXCConfig(c *execdriver.Command) (string, error) {
 	}
 	return root, nil
 }
+
+func (d *driver) generateEnvConfig(c *execdriver.Command) error {
+	data, err := json.Marshal(c.Env)
+	if err != nil {
+		return err
+	}
+	p := path.Join(d.root, "containers", c.ID, "config.env")
+	c.Mounts = append(c.Mounts, execdriver.Mount{p, "/.dockerenv", false, true})
+
+	return ioutil.WriteFile(p, data, 0600)
+}

daemon/volumes.go

@@ -2,14 +2,15 @@ package daemon
 
 import (
 	"fmt"
-	"github.com/dotcloud/docker/archive"
-	"github.com/dotcloud/docker/daemon/execdriver"
-	"github.com/dotcloud/docker/utils"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
 	"syscall"
+
+	"github.com/dotcloud/docker/archive"
+	"github.com/dotcloud/docker/daemon/execdriver"
+	"github.com/dotcloud/docker/utils"
 )
 
 type BindMap struct {
@@ -34,14 +35,8 @@ func prepareVolumesForContainer(container *Container) error {
 }
 
 func setupMountsForContainer(container *Container) error {
-	envPath, err := container.EnvConfigPath()
-	if err != nil {
-		return err
-	}
-
 	mounts := []execdriver.Mount{
 		{container.daemon.sysInitPath, "/.dockerinit", false, true},
-		{envPath, "/.dockerenv", false, true},
 		{container.ResolvConfPath, "/etc/resolv.conf", false, true},
 	}