Merge pull request #9426 from lhuard1A/overlay_rename

Rename overlayfs to overlay

contrib/check-config.sh

@@ -76,7 +76,7 @@ check_flags() {
 	for flag in "$@"; do
 		echo "- $(check_flag "$flag")"
 	done
-} 
+}
 
 if [ ! -e "$CONFIG" ]; then
 	wrap_warning "warning: $CONFIG does not exist, searching other paths for kernel config..."
@@ -165,8 +165,8 @@ echo '- Storage Drivers:'
 	echo '- "'$(wrap_color 'devicemapper' blue)'":'
 	check_flags BLK_DEV_DM DM_THIN_PROVISIONING EXT4_FS EXT4_FS_POSIX_ACL EXT4_FS_SECURITY | sed 's/^/  /'
 
-	echo '- "'$(wrap_color 'overlayfs' blue)'":'
+	echo '- "'$(wrap_color 'overlay' blue)'":'
-	check_flags OVERLAYFS_FS | sed 's/^/  /'
+	check_flags OVERLAY_FS | sed 's/^/  /'
 } | sed 's/^/  /'
 echo
 

daemon/daemon_overlay.go

@@ -0,0 +1,7 @@
+// +build !exclude_graphdriver_overlay
+
+package daemon
+
+import (
+	_ "github.com/docker/docker/daemon/graphdriver/overlay"
+)

daemon/daemon_overlayfs.go

@@ -1,7 +0,0 @@
-// +build !exclude_graphdriver_overlayfs
-
-package daemon
-
-import (
-	_ "github.com/docker/docker/daemon/graphdriver/overlayfs"
-)

daemon/graphdriver/driver.go

@@ -81,7 +81,7 @@ var (
 		"devicemapper",
 		"vfs",
 		// experimental, has to be enabled manually for now
-		"overlayfs",
+		"overlay",
 	}
 
 	ErrNotSupported   = errors.New("driver not supported")

daemon/graphdriver/overlay/copy.go

@@ -1,6 +1,6 @@
 // +build linux
 
-package overlayfs
+package overlay
 
 import (
 	"fmt"
@@ -122,8 +122,8 @@ func copyDir(srcDir, dstDir string, flags CopyFlags) error {
 			return err
 		}
 
-		// We need to copy this attribute if it appears in an overlayfs upper layer, as
+		// We need to copy this attribute if it appears in an overlay upper layer, as
-		// this function is used to copy those. It is set by overlayfs if a directory
+		// this function is used to copy those. It is set by overlay if a directory
 		// is removed and then re-created and should not inherit anything from the
 		// same dir in the lower dir.
 		if err := copyXattr(srcPath, dstPath, "trusted.overlay.opaque"); err != nil {

daemon/graphdriver/overlay/overlay.go

@@ -1,6 +1,6 @@
 // +build linux
 
-package overlayfs
+package overlay
 
 import (
 	"bufio"
@@ -9,7 +9,6 @@ import (
 	"os"
 	"os/exec"
 	"path"
-	"strings"
 	"sync"
 	"syscall"
 
@@ -51,18 +50,18 @@ func (d *naiveDiffDriverWithApply) ApplyDiff(id, parent string, diff archive.Arc
 	return b, err
 }
 
-// This backend uses the overlayfs union filesystem for containers
+// This backend uses the overlay union filesystem for containers
 // plus hard link file sharing for images.
 
 // Each container/image can have a "root" subdirectory which is a plain
-// filesystem hierarchy, or they can use overlayfs.
+// filesystem hierarchy, or they can use overlay.
 
-// If they use overlayfs there is a "upper" directory and a "lower-id"
+// If they use overlay there is a "upper" directory and a "lower-id"
 // file, as well as "merged" and "work" directories. The "upper"
 // directory has the upper layer of the overlay, and "lower-id" contains
 // the id of the parent whose "root" directory shall be used as the lower
 // layer in the overlay. The overlay itself is mounted in the "merged"
-// directory, and the "work" dir is needed for overlayfs to work.
+// directory, and the "work" dir is needed for overlay to work.
 
 // When a overlay layer is created there are two cases, either the
 // parent has a "root" dir, then we start out with a empty "upper"
@@ -91,11 +90,11 @@ type Driver struct {
 }
 
 func init() {
-	graphdriver.Register("overlayfs", Init)
+	graphdriver.Register("overlay", Init)
 }
 
 func Init(home string, options []string) (graphdriver.Driver, error) {
-	if err := supportsOverlayfs(); err != nil {
+	if err := supportsOverlay(); err != nil {
 		return nil, graphdriver.ErrNotSupported
 	}
 
@@ -112,10 +111,10 @@ func Init(home string, options []string) (graphdriver.Driver, error) {
 	return NaiveDiffDriverWithApply(d), nil
 }
 
-func supportsOverlayfs() error {
+func supportsOverlay() error {
-	// We can try to modprobe overlayfs first before looking at
+	// We can try to modprobe overlay first before looking at
-	// proc/filesystems for when overlayfs is supported
+	// proc/filesystems for when overlay is supported
-	exec.Command("modprobe", "overlayfs").Run()
+	exec.Command("modprobe", "overlay").Run()
 
 	f, err := os.Open("/proc/filesystems")
 	if err != nil {
@@ -125,16 +124,16 @@ func supportsOverlayfs() error {
 
 	s := bufio.NewScanner(f)
 	for s.Scan() {
-		if strings.Contains(s.Text(), "overlayfs") {
+		if s.Text() == "nodev\toverlay" {
 			return nil
 		}
 	}
-	log.Error("'overlayfs' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlayfs support loaded.")
+	log.Error("'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.")
 	return graphdriver.ErrNotSupported
 }
 
 func (d *Driver) String() string {
-	return "overlayfs"
+	return "overlay"
 }
 
 func (d *Driver) Status() [][2]string {
@@ -176,7 +175,7 @@ func (d *Driver) Create(id string, parent string) (retErr error) {
 		return err
 	}
 
-	// If parent has a root, just do a overlayfs to it
+	// If parent has a root, just do a overlay to it
 	parentRoot := path.Join(parentDir, "root")
 
 	if s, err := os.Lstat(parentRoot); err == nil {
@@ -274,7 +273,7 @@ func (d *Driver) Get(id string, mountLabel string) (string, error) {
 	mergedDir := path.Join(dir, "merged")
 
 	opts := fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", lowerDir, upperDir, workDir)
-	if err := syscall.Mount("overlayfs", mergedDir, "overlayfs", 0, label.FormatMountLabel(opts, mountLabel)); err != nil {
+	if err := syscall.Mount("overlay", mergedDir, "overlay", 0, label.FormatMountLabel(opts, mountLabel)); err != nil {
 		return "", err
 	}
 	mount.path = mergedDir
@@ -302,7 +301,7 @@ func (d *Driver) Put(id string) {
 
 	if mount.mounted {
 		if err := syscall.Unmount(mount.path, 0); err != nil {
-			log.Debugf("Failed to unmount %s overlayfs: %v", id, err)
+			log.Debugf("Failed to unmount %s overlay: %v", id, err)
 		}
 	}
 

daemon/graphdriver/overlay/overlay_test.go

@@ -0,0 +1,28 @@
+package overlay
+
+import (
+	"github.com/docker/docker/daemon/graphdriver/graphtest"
+	"testing"
+)
+
+// This avoids creating a new driver for each test if all tests are run
+// Make sure to put new tests between TestOverlaySetup and TestOverlayTeardown
+func TestOverlaySetup(t *testing.T) {
+	graphtest.GetDriver(t, "overlay")
+}
+
+func TestOverlayCreateEmpty(t *testing.T) {
+	graphtest.DriverTestCreateEmpty(t, "overlay")
+}
+
+func TestOverlayCreateBase(t *testing.T) {
+	graphtest.DriverTestCreateBase(t, "overlay")
+}
+
+func TestOverlayCreateSnap(t *testing.T) {
+	graphtest.DriverTestCreateSnap(t, "overlay")
+}
+
+func TestOverlayTeardown(t *testing.T) {
+	graphtest.PutDriver(t)
+}

daemon/graphdriver/overlayfs/overlayfs_test.go

@@ -1,28 +0,0 @@
-package overlayfs
-
-import (
-	"github.com/docker/docker/daemon/graphdriver/graphtest"
-	"testing"
-)
-
-// This avoids creating a new driver for each test if all tests are run
-// Make sure to put new tests between TestOverlayfsSetup and TestOverlayfsTeardown
-func TestOverlayfsSetup(t *testing.T) {
-	graphtest.GetDriver(t, "overlayfs")
-}
-
-func TestOverlayfsCreateEmpty(t *testing.T) {
-	graphtest.DriverTestCreateEmpty(t, "overlayfs")
-}
-
-func TestOverlayfsCreateBase(t *testing.T) {
-	graphtest.DriverTestCreateBase(t, "overlayfs")
-}
-
-func TestOverlayfsCreateSnap(t *testing.T) {
-	graphtest.DriverTestCreateSnap(t, "overlayfs")
-}
-
-func TestOverlayfsTeardown(t *testing.T) {
-	graphtest.PutDriver(t)
-}

docs/sources/reference/commandline/cli.md

@@ -156,7 +156,7 @@ string is equivalent to setting the `--tlsverify` flag. The following are equiva
 ### Daemon storage-driver option
 
 The Docker daemon has support for several different image layer storage drivers: `aufs`,
-`devicemapper`, `btrfs` and `overlayfs`.
+`devicemapper`, `btrfs` and `overlay`.
 
 The `aufs` driver is the oldest, but is based on a Linux kernel patch-set that
 is unlikely to be merged into the main kernel. These are also known to cause some
@@ -175,9 +175,9 @@ To tell the Docker daemon to use `devicemapper`, use
 The `btrfs` driver is very fast for `docker build` - but like `devicemapper` does not
 share executable memory between devices. Use `docker -d -s btrfs -g /mnt/btrfs_partition`.
 
-The `overlayfs` is a very fast union filesystem. It is now merged in the main
+The `overlay` is a very fast union filesystem. It is now merged in the main
 Linux kernel as of [3.18.0](https://lkml.org/lkml/2014/10/26/137).
-Call `docker -d -s overlayfs` to use it.
+Call `docker -d -s overlay` to use it.
 
 ### Docker exec-driver option