Remove unneeded references to execDriver

This includes:
 - updating the docs
 - removing dangling variables

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

contrib/completion/fish/docker.fish

@@ -51,7 +51,7 @@ complete -c docker -f -n '__fish_docker_no_subcommand' -s d -l daemon -d 'Enable
 complete -c docker -f -n '__fish_docker_no_subcommand' -l dns -d 'Force Docker to use specific DNS servers'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l dns-opt -d 'Force Docker to use specific DNS options'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l dns-search -d 'Force Docker to use specific DNS search domains'
-complete -c docker -f -n '__fish_docker_no_subcommand' -l exec-opt -d 'Set exec driver options'
+complete -c docker -f -n '__fish_docker_no_subcommand' -l exec-opt -d 'Set runtime execution options'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l fixed-cidr -d 'IPv4 subnet for fixed IPs (e.g. 10.20.0.0/16)'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l fixed-cidr-v6 -d 'IPv6 subnet for fixed IPs (e.g.: 2001:a02b/48)'
 complete -c docker -f -n '__fish_docker_no_subcommand' -s G -l group -d 'Group to assign the unix socket specified by -H when running in daemon mode'

contrib/completion/zsh/_docker

@@ -650,8 +650,8 @@ __docker_subcommand() {
                 "($help)*--dns-opt=[DNS options to use]:DNS option: " \
                 "($help)*--default-ulimit=[Default ulimit settings for containers]:ulimit: " \
                 "($help)--disable-legacy-registry[Do not contact legacy registries]" \
-                "($help)*--exec-opt=[Exec driver options]:exec driver options: " \
+                "($help)*--exec-opt=[Runtime execution options]:runtime execution options: " \
-                "($help)--exec-root=[Root of the Docker execdriver]:path:_directories" \
+                "($help)--exec-root=[Root directory for execution state files]:path:_directories" \
                 "($help)--fixed-cidr=[IPv4 subnet for fixed IPs]:IPv4 subnet: " \
                 "($help)--fixed-cidr-v6=[IPv6 subnet for fixed IPs]:IPv6 subnet: " \
                 "($help -G --group)"{-G=,--group=}"[Group for the unix socket]:group:_groups" \

daemon/config.go

@@ -112,10 +112,10 @@ func (config *Config) InstallCommonFlags(cmd *flag.FlagSet, usageFn func(string)
 
 	cmd.Var(opts.NewNamedListOptsRef("storage-opts", &config.GraphOptions, nil), []string{"-storage-opt"}, usageFn("Set storage driver options"))
 	cmd.Var(opts.NewNamedListOptsRef("authorization-plugins", &config.AuthorizationPlugins, nil), []string{"-authorization-plugin"}, usageFn("List authorization plugins in order from first evaluator to last"))
-	cmd.Var(opts.NewNamedListOptsRef("exec-opts", &config.ExecOptions, nil), []string{"-exec-opt"}, usageFn("Set exec driver options"))
+	cmd.Var(opts.NewNamedListOptsRef("exec-opts", &config.ExecOptions, nil), []string{"-exec-opt"}, usageFn("Set runtime execution options"))
 	cmd.StringVar(&config.Pidfile, []string{"p", "-pidfile"}, defaultPidFile, usageFn("Path to use for daemon PID file"))
 	cmd.StringVar(&config.Root, []string{"g", "-graph"}, defaultGraph, usageFn("Root of the Docker runtime"))
-	cmd.StringVar(&config.ExecRoot, []string{"-exec-root"}, defaultExecRoot, usageFn("Root of the Docker execdriver"))
+	cmd.StringVar(&config.ExecRoot, []string{"-exec-root"}, defaultExecRoot, usageFn("Root directory for execution state files"))
 	cmd.BoolVar(&config.AutoRestart, []string{"#r", "#-restart"}, true, usageFn("--restart on the daemon has been deprecated in favor of --restart policies on docker run"))
 	cmd.StringVar(&config.GraphDriver, []string{"s", "-storage-driver"}, "", usageFn("Storage driver to use"))
 	cmd.IntVar(&config.Mtu, []string{"#mtu", "-mtu"}, 0, usageFn("Set the containers network MTU"))

daemon/daemon_unix.go

@@ -51,6 +51,10 @@ const (
 	// constants for remapped root settings
 	defaultIDSpecifier string = "default"
 	defaultRemappedID  string = "dockremap"
+
+	// constant for cgroup drivers
+	cgroupFsDriver      = "cgroupfs"
+	cgroupSystemdDriver = "systemd"
 )
 
 func getMemoryResources(config containertypes.Resources) *specs.Memory {
@@ -460,29 +464,30 @@ func verifyContainerResources(resources *containertypes.Resources, sysInfo *sysi
 }
 
 func (daemon *Daemon) getCgroupDriver() string {
-	cgroupDriver := "cgroupfs"
+	cgroupDriver := cgroupFsDriver
-	if daemon.usingSystemd() {
-		cgroupDriver = "systemd"
-	}
-	return cgroupDriver
-}
 
-func usingSystemd(config *Config) bool {
+	// No other cgroup drivers are supported at the moment. Warn the
-	for _, option := range config.ExecOptions {
+	// user if they tried to set one other than cgroupfs
+	for _, option := range daemon.configStore.ExecOptions {
 		key, val, err := parsers.ParseKeyValueOpt(option)
 		if err != nil || !strings.EqualFold(key, "native.cgroupdriver") {
 			continue
 		}
-		if val == "systemd" {
+		if val != cgroupFsDriver {
-			return true
+			logrus.Warnf("cgroupdriver '%s' is not supported", val)
 		}
 	}
 
+	return cgroupDriver
+}
+
+func usingSystemd(config *Config) bool {
+	// No support for systemd cgroup atm
 	return false
 }
 
 func (daemon *Daemon) usingSystemd() bool {
-	return usingSystemd(daemon.configStore)
+	return daemon.getCgroupDriver() == cgroupSystemdDriver
 }
 
 // verifyPlatformContainerSettings performs platform-specific validation of the

daemon/graphdriver/devmapper/README.md

@@ -92,6 +92,5 @@ This uses the `dm` prefix and would be used something like `docker daemon --stor
 
 These options are currently documented both in [the man
 page](../../../man/docker.1.md) and in [the online
-documentation](https://docs.docker.com/reference/commandline/daemon/#docker-
+documentation](https://docs.docker.com/reference/commandline/daemon/#storage-driver-options).
-execdriver-option).  If you add an options, update both the `man` page and the
+If you add an options, update both the `man` page and the documentation.
-documentation.

daemon/kill.go

@@ -103,7 +103,7 @@ func (daemon *Daemon) Kill(container *container.Container) error {
 		// because if we can't stop the container by this point then
 		// its probably because its already stopped. Meaning, between
 		// the time of the IsRunning() call above and now it stopped.
-		// Also, since the err return will be exec driver specific we can't
+		// Also, since the err return will be environment specific we can't
 		// look for any particular (common) error that would indicate
 		// that the process is already dead vs something else going wrong.
 		// So, instead we'll give it up to 2 more seconds to complete and if

daemon/volumes_windows.go

@@ -11,8 +11,8 @@ import (
 )
 
 // setupMounts configures the mount points for a container by appending each
-// of the configured mounts on the container to the oci mount structure
+// of the configured mounts on the container to the OCI mount structure
-// which will ultimately be passed into the exec driver during container creation.
+// which will ultimately be passed into the oci runtime during container creation.
 // It also ensures each of the mounts are lexographically sorted.
 
 // BUGBUG TODO Windows containerd. This would be much better if it returned

docs/admin/configuring.md

@@ -162,7 +162,7 @@ can be located at `/var/log/upstart/docker.log`
 
     $ tail -f /var/log/upstart/docker.log
     INFO[0000] Loading containers: done.
-    INFO[0000] docker daemon: 1.6.0 4749651; execdriver: native-0.2; graphdriver: aufs
+    INFO[0000] Docker daemon commit=1b09a95-unsupported graphdriver=aufs version=1.11.0-dev
     INFO[0000] +job acceptconnections()
     INFO[0000] -job acceptconnections() = OK (0)
     INFO[0000] Daemon has completed initialization
@@ -273,7 +273,7 @@ be viewed using `journalctl -u docker`
     May 06 00:22:06 localhost.localdomain docker[2495]: time="2015-05-06T00:22:06Z" level="info" msg="-job init_networkdriver() = OK (0)"
     May 06 00:22:06 localhost.localdomain docker[2495]: time="2015-05-06T00:22:06Z" level="info" msg="Loading containers: start."
     May 06 00:22:06 localhost.localdomain docker[2495]: time="2015-05-06T00:22:06Z" level="info" msg="Loading containers: done."
-    May 06 00:22:06 localhost.localdomain docker[2495]: time="2015-05-06T00:22:06Z" level="info" msg="docker daemon: 1.5.0-dev fc0329b/1.5.0; execdriver: native-0.2; graphdriver: devicemapper"
+    May 06 00:22:06 localhost.localdomain docker[2495]: time="2015-05-06T00:22:06Z" level="info" msg="Docker daemon commit=1b09a95-unsupported graphdriver=aufs version=1.11.0-dev"
     May 06 00:22:06 localhost.localdomain docker[2495]: time="2015-05-06T00:22:06Z" level="info" msg="+job acceptconnections()"
     May 06 00:22:06 localhost.localdomain docker[2495]: time="2015-05-06T00:22:06Z" level="info" msg="-job acceptconnections() = OK (0)"
 

docs/reference/commandline/daemon.md

@@ -32,8 +32,8 @@ weight = -1
       --dns-opt=[]                           DNS options to use
       --dns-search=[]                        DNS search domains to use
       --default-ulimit=[]                    Set default ulimit settings for containers
-      --exec-opt=[]                          Set exec driver options
+      --exec-opt=[]                          Set runtime execution options
-      --exec-root="/var/run/docker"          Root of the Docker execdriver
+      --exec-root="/var/run/docker"          Root directory for execution state files
       --fixed-cidr=""                        IPv4 subnet for fixed IPs
       --fixed-cidr-v6=""                     IPv6 subnet for fixed IPs
       -G, --group="docker"                   Group for the unix socket
@@ -476,24 +476,26 @@ Currently supported options of `zfs`:
 
         $ docker daemon -s zfs --storage-opt zfs.fsname=zroot/docker
 
-## Docker execdriver option
+## Docker runtime execution options
 
-The Docker daemon uses a specifically built `libcontainer` execution driver as
+The Docker daemon relies on a
-its interface to the Linux kernel `namespaces`, `cgroups`, and `SELinux`.
+[OCI](https://github.com/opencontainers/specs) compliant runtime
+(invoked via the `containerd` daemon) as its interface to the Linux
+kernel `namespaces`, `cgroups`, and `SELinux`.
 
-## Options for the native execdriver
+## Options for the runtime
 
-You can configure the `native` (libcontainer) execdriver using options specified
+You can configure the runtime using options specified
 with the `--exec-opt` flag. All the flag's options have the `native` prefix. A
 single `native.cgroupdriver` option is available.
 
 The `native.cgroupdriver` option specifies the management of the container's
-cgroups. You can specify `cgroupfs` or `systemd`. If you specify `systemd` and
+cgroups. You can specify only specify `cgroupfs` at the moment.  If you omit the
-it is not available, the system uses `cgroupfs`. If you omit the
 `native.cgroupdriver` option,` cgroupfs` is used.
-This example sets the `cgroupdriver` to `systemd`:
 
-    $ sudo docker daemon --exec-opt native.cgroupdriver=systemd
+This example explicitely sets the `cgroupdriver` to `cgroupfs`:
+
+    $ sudo docker daemon --exec-opt native.cgroupdriver=cgroupfs
 
 Setting this option applies to all containers the daemon launches.
 

docs/security/security.md

@@ -198,7 +198,7 @@ to the host.
 This won't affect regular web apps; but malicious users will find that
 the arsenal at their disposal has shrunk considerably! By default Docker
 drops all capabilities except [those
-needed](https://github.com/docker/docker/blob/87de5fdd5972343a11847922e0f41d9898b5cff7/daemon/execdriver/native/template/default_template_linux.go#L16-L29),
+needed](https://github.com/docker/docker/blob/master/oci/defaults_linux.go#L64-L79),
 a whitelist instead of a blacklist approach. You can see a full list of
 available capabilities in [Linux
 manpages](http://man7.org/linux/man-pages/man7/capabilities.7.html).

docs/userguide/storagedriver/device-mapper-driver.md

@@ -279,7 +279,7 @@ options were created in the previous steps.
           INFO[0027] Option DefaultNetwork: bridge
           <output truncated>
           INFO[0027] Daemon has completed initialization
-          INFO[0027] Docker daemon commit=0a8c2e3 execdriver=native-0.2 graphdriver=devicemapper version=1.8.2
+          INFO[0027] Docker daemon commit=1b09a95-unsupported graphdriver=aufs version=1.11.0-dev
 
     It is also possible to set the `--storage-driver` and `--storage-opt` flags
  in the Docker config file and start the daemon normally using the `service` or

integration-cli/docker_test_vars.go

@@ -22,7 +22,6 @@ var (
 	// TODO Windows CI. These are incorrect and need fixing into
 	// platform specific pieces.
 	runtimePath = "/var/run/docker"
-	execDriverPath = runtimePath + "/execdriver/native"
 
 	workingDirectory string
 

man/docker-daemon.8.md

@@ -126,10 +126,10 @@ format.
   DNS search domains to use.
 
 **--exec-opt**=[]
-  Set exec driver options. See EXEC DRIVER OPTIONS.
+  Set runtime execution options. See RUNTIME EXECUTION OPTIONS.
 
 **--exec-root**=""
-  Path to use as the root of the Docker exec driver. Default is `/var/run/docker`.
+  Path to use as the root of the Docker execution state files. Default is `/var/run/docker`.
 
 **--fixed-cidr**=""
   IPv4 subnet for fixed IPs (e.g., 10.20.0.0/16); this subnet must be nested in the bridge subnet (which is defined by \-b or \-\-bip)

man/docker-inspect.1.md

@@ -110,7 +110,6 @@ To get information on a container use its ID or instance name:
     "Name": "/adoring_wozniak",
     "RestartCount": 0,
     "Driver": "devicemapper",
-    "ExecDriver": "native-0.2",
     "MountLabel": "",
     "ProcessLabel": "",
     "Mounts": [

man/docker.1.md

@@ -224,15 +224,14 @@ inside it)
   See **docker-wait(1)** for full documentation on the **wait** command.
 
 
-# EXEC DRIVER OPTIONS
+# RUNTIME EXECUTION OPTIONS
 
 Use the **--exec-opt** flags to specify options to the execution driver.
 The following options are available:
 
 #### native.cgroupdriver
-Specifies the management of the container's `cgroups`. You can specify 
+Specifies the management of the container's `cgroups`. Only `cgroupfs` can be specified
-`cgroupfs` or `systemd`. If you specify `systemd` and it is not available, the 
+`cgroupfs` at the moment.
-system uses `cgroupfs`.
 
 #### Client
 For specific client examples please see the man page for the specific Docker