Merge pull request #8357 from mheon/add_volume_interface_package

Add API for communicating with Docker volume plugins

21 files changed, 1335 insertions, 0 deletions

diff --git a/vendor/github.com/coreos/go-systemd/LICENSE b/vendor/github.com/coreos/go-systemd/LICENSE
new file mode 100644
index 000000000..37ec93a14
--- /dev/null
+++ b/vendor/github.com/coreos/go-systemd/LICENSE
@@ -0,0 +1,191 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction, and
+distribution as defined by Sections 1 through 9 of this document.
+
+"Licensor" shall mean the copyright owner or entity authorized by the copyright
+owner that is granting the License.
+
+"Legal Entity" shall mean the union of the acting entity and all other entities
+that control, are controlled by, or are under common control with that entity.
+For the purposes of this definition, "control" means (i) the power, direct or
+indirect, to cause the direction or management of such entity, whether by
+contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the
+outstanding shares, or (iii) beneficial ownership of such entity.
+
+"You" (or "Your") shall mean an individual or Legal Entity exercising
+permissions granted by this License.
+
+"Source" form shall mean the preferred form for making modifications, including
+but not limited to software source code, documentation source, and configuration
+files.
+
+"Object" form shall mean any form resulting from mechanical transformation or
+translation of a Source form, including but not limited to compiled object code,
+generated documentation, and conversions to other media types.
+
+"Work" shall mean the work of authorship, whether in Source or Object form, made
+available under the License, as indicated by a copyright notice that is included
+in or attached to the work (an example is provided in the Appendix below).
+
+"Derivative Works" shall mean any work, whether in Source or Object form, that
+is based on (or derived from) the Work and for which the editorial revisions,
+annotations, elaborations, or other modifications represent, as a whole, an
+original work of authorship. For the purposes of this License, Derivative Works
+shall not include works that remain separable from, or merely link (or bind by
+name) to the interfaces of, the Work and Derivative Works thereof.
+
+"Contribution" shall mean any work of authorship, including the original version
+of the Work and any modifications or additions to that Work or Derivative Works
+thereof, that is intentionally submitted to Licensor for inclusion in the Work
+by the copyright owner or by an individual or Legal Entity authorized to submit
+on behalf of the copyright owner. For the purposes of this definition,
+"submitted" means any form of electronic, verbal, or written communication sent
+to the Licensor or its representatives, including but not limited to
+communication on electronic mailing lists, source code control systems, and
+issue tracking systems that are managed by, or on behalf of, the Licensor for
+the purpose of discussing and improving the Work, but excluding communication
+that is conspicuously marked or otherwise designated in writing by the copyright
+owner as "Not a Contribution."
+
+"Contributor" shall mean Licensor and any individual or Legal Entity on behalf
+of whom a Contribution has been received by Licensor and subsequently
+incorporated within the Work.
+
+2. Grant of Copyright License.
+
+Subject to the terms and conditions of this License, each Contributor hereby
+grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
+irrevocable copyright license to reproduce, prepare Derivative Works of,
+publicly display, publicly perform, sublicense, and distribute the Work and such
+Derivative Works in Source or Object form.
+
+3. Grant of Patent License.
+
+Subject to the terms and conditions of this License, each Contributor hereby
+grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
+irrevocable (except as stated in this section) patent license to make, have
+made, use, offer to sell, sell, import, and otherwise transfer the Work, where
+such license applies only to those patent claims licensable by such Contributor
+that are necessarily infringed by their Contribution(s) alone or by combination
+of their Contribution(s) with the Work to which such Contribution(s) was
+submitted. If You institute patent litigation against any entity (including a
+cross-claim or counterclaim in a lawsuit) alleging that the Work or a
+Contribution incorporated within the Work constitutes direct or contributory
+patent infringement, then any patent licenses granted to You under this License
+for that Work shall terminate as of the date such litigation is filed.
+
+4. Redistribution.
+
+You may reproduce and distribute copies of the Work or Derivative Works thereof
+in any medium, with or without modifications, and in Source or Object form,
+provided that You meet the following conditions:
+
+You must give any other recipients of the Work or Derivative Works a copy of
+this License; and
+You must cause any modified files to carry prominent notices stating that You
+changed the files; and
+You must retain, in the Source form of any Derivative Works that You distribute,
+all copyright, patent, trademark, and attribution notices from the Source form
+of the Work, excluding those notices that do not pertain to any part of the
+Derivative Works; and
+If the Work includes a "NOTICE" text file as part of its distribution, then any
+Derivative Works that You distribute must include a readable copy of the
+attribution notices contained within such NOTICE file, excluding those notices
+that do not pertain to any part of the Derivative Works, in at least one of the
+following places: within a NOTICE text file distributed as part of the
+Derivative Works; within the Source form or documentation, if provided along
+with the Derivative Works; or, within a display generated by the Derivative
+Works, if and wherever such third-party notices normally appear. The contents of
+the NOTICE file are for informational purposes only and do not modify the
+License. You may add Your own attribution notices within Derivative Works that
+You distribute, alongside or as an addendum to the NOTICE text from the Work,
+provided that such additional attribution notices cannot be construed as
+modifying the License.
+You may add Your own copyright statement to Your modifications and may provide
+additional or different license terms and conditions for use, reproduction, or
+distribution of Your modifications, or for any such Derivative Works as a whole,
+provided Your use, reproduction, and distribution of the Work otherwise complies
+with the conditions stated in this License.
+
+5. Submission of Contributions.
+
+Unless You explicitly state otherwise, any Contribution intentionally submitted
+for inclusion in the Work by You to the Licensor shall be under the terms and
+conditions of this License, without any additional terms or conditions.
+Notwithstanding the above, nothing herein shall supersede or modify the terms of
+any separate license agreement you may have executed with Licensor regarding
+such Contributions.
+
+6. Trademarks.
+
+This License does not grant permission to use the trade names, trademarks,
+service marks, or product names of the Licensor, except as required for
+reasonable and customary use in describing the origin of the Work and
+reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty.
+
+Unless required by applicable law or agreed to in writing, Licensor provides the
+Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
+including, without limitation, any warranties or conditions of TITLE,
+NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are
+solely responsible for determining the appropriateness of using or
+redistributing the Work and assume any risks associated with Your exercise of
+permissions under this License.
+
+8. Limitation of Liability.
+
+In no event and under no legal theory, whether in tort (including negligence),
+contract, or otherwise, unless required by applicable law (such as deliberate
+and grossly negligent acts) or agreed to in writing, shall any Contributor be
+liable to You for damages, including any direct, indirect, special, incidental,
+or consequential damages of any character arising as a result of this License or
+out of the use or inability to use the Work (including but not limited to
+damages for loss of goodwill, work stoppage, computer failure or malfunction, or
+any and all other commercial damages or losses), even if such Contributor has
+been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability.
+
+While redistributing the Work or Derivative Works thereof, You may choose to
+offer, and charge a fee for, acceptance of support, warranty, indemnity, or
+other liability obligations and/or rights consistent with this License. However,
+in accepting such obligations, You may act only on Your own behalf and on Your
+sole responsibility, not on behalf of any other Contributor, and only if You
+agree to indemnify, defend, and hold each Contributor harmless for any liability
+incurred by, or claims asserted against, such Contributor by reason of your
+accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work
+
+To apply the Apache License to your work, attach the following boilerplate
+notice, with the fields enclosed by brackets "[]" replaced with your own
+identifying information. (Don't include the brackets!) The text should be
+enclosed in the appropriate comment syntax for the file format. We also
+recommend that a file or class name and description of purpose be included on
+the same "printed page" as the copyright notice for easier identification within
+third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/vendor/github.com/coreos/go-systemd/NOTICE b/vendor/github.com/coreos/go-systemd/NOTICE
new file mode 100644
index 000000000..23a0ada2f
--- /dev/null
+++ b/vendor/github.com/coreos/go-systemd/NOTICE
@@ -0,0 +1,5 @@
+CoreOS Project
+Copyright 2018 CoreOS, Inc
+
+This product includes software developed at CoreOS, Inc.
+(http://www.coreos.com/).
diff --git a/vendor/github.com/coreos/go-systemd/activation/files.go b/vendor/github.com/coreos/go-systemd/activation/files.go
new file mode 100644
index 000000000..29dd18def
--- /dev/null
+++ b/vendor/github.com/coreos/go-systemd/activation/files.go
@@ -0,0 +1,67 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package activation implements primitives for systemd socket activation.
+package activation
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+const (
+	// listenFdsStart corresponds to `SD_LISTEN_FDS_START`.
+	listenFdsStart = 3
+)
+
+// Files returns a slice containing a `os.File` object for each
+// file descriptor passed to this process via systemd fd-passing protocol.
+//
+// The order of the file descriptors is preserved in the returned slice.
+// `unsetEnv` is typically set to `true` in order to avoid clashes in
+// fd usage and to avoid leaking environment flags to child processes.
+func Files(unsetEnv bool) []*os.File {
+	if unsetEnv {
+		defer os.Unsetenv("LISTEN_PID")
+		defer os.Unsetenv("LISTEN_FDS")
+		defer os.Unsetenv("LISTEN_FDNAMES")
+	}
+
+	pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
+	if err != nil || pid != os.Getpid() {
+		return nil
+	}
+
+	nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
+	if err != nil || nfds == 0 {
+		return nil
+	}
+
+	names := strings.Split(os.Getenv("LISTEN_FDNAMES"), ":")
+
+	files := make([]*os.File, 0, nfds)
+	for fd := listenFdsStart; fd < listenFdsStart+nfds; fd++ {
+		syscall.CloseOnExec(fd)
+		name := "LISTEN_FD_" + strconv.Itoa(fd)
+		offset := fd - listenFdsStart
+		if offset < len(names) && len(names[offset]) > 0 {
+			name = names[offset]
+		}
+		files = append(files, os.NewFile(uintptr(fd), name))
+	}
+
+	return files
+}
diff --git a/vendor/github.com/coreos/go-systemd/activation/listeners.go b/vendor/github.com/coreos/go-systemd/activation/listeners.go
new file mode 100644
index 000000000..bb5cc2311
--- /dev/null
+++ b/vendor/github.com/coreos/go-systemd/activation/listeners.go
@@ -0,0 +1,103 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package activation
+
+import (
+	"crypto/tls"
+	"net"
+)
+
+// Listeners returns a slice containing a net.Listener for each matching socket type
+// passed to this process.
+//
+// The order of the file descriptors is preserved in the returned slice.
+// Nil values are used to fill any gaps. For example if systemd were to return file descriptors
+// corresponding with "udp, tcp, tcp", then the slice would contain {nil, net.Listener, net.Listener}
+func Listeners() ([]net.Listener, error) {
+	files := Files(true)
+	listeners := make([]net.Listener, len(files))
+
+	for i, f := range files {
+		if pc, err := net.FileListener(f); err == nil {
+			listeners[i] = pc
+			f.Close()
+		}
+	}
+	return listeners, nil
+}
+
+// ListenersWithNames maps a listener name to a set of net.Listener instances.
+func ListenersWithNames() (map[string][]net.Listener, error) {
+	files := Files(true)
+	listeners := map[string][]net.Listener{}
+
+	for _, f := range files {
+		if pc, err := net.FileListener(f); err == nil {
+			current, ok := listeners[f.Name()]
+			if !ok {
+				listeners[f.Name()] = []net.Listener{pc}
+			} else {
+				listeners[f.Name()] = append(current, pc)
+			}
+			f.Close()
+		}
+	}
+	return listeners, nil
+}
+
+// TLSListeners returns a slice containing a net.listener for each matching TCP socket type
+// passed to this process.
+// It uses default Listeners func and forces TCP sockets handlers to use TLS based on tlsConfig.
+func TLSListeners(tlsConfig *tls.Config) ([]net.Listener, error) {
+	listeners, err := Listeners()
+
+	if listeners == nil || err != nil {
+		return nil, err
+	}
+
+	if tlsConfig != nil && err == nil {
+		for i, l := range listeners {
+			// Activate TLS only for TCP sockets
+			if l.Addr().Network() == "tcp" {
+				listeners[i] = tls.NewListener(l, tlsConfig)
+			}
+		}
+	}
+
+	return listeners, err
+}
+
+// TLSListenersWithNames maps a listener name to a net.Listener with
+// the associated TLS configuration.
+func TLSListenersWithNames(tlsConfig *tls.Config) (map[string][]net.Listener, error) {
+	listeners, err := ListenersWithNames()
+
+	if listeners == nil || err != nil {
+		return nil, err
+	}
+
+	if tlsConfig != nil && err == nil {
+		for _, ll := range listeners {
+			// Activate TLS only for TCP sockets
+			for i, l := range ll {
+				if l.Addr().Network() == "tcp" {
+					ll[i] = tls.NewListener(l, tlsConfig)
+				}
+			}
+		}
+	}
+
+	return listeners, err
+}
diff --git a/vendor/github.com/coreos/go-systemd/activation/packetconns.go b/vendor/github.com/coreos/go-systemd/activation/packetconns.go
new file mode 100644
index 000000000..a97206785
--- /dev/null
+++ b/vendor/github.com/coreos/go-systemd/activation/packetconns.go
@@ -0,0 +1,38 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package activation
+
+import (
+	"net"
+)
+
+// PacketConns returns a slice containing a net.PacketConn for each matching socket type
+// passed to this process.
+//
+// The order of the file descriptors is preserved in the returned slice.
+// Nil values are used to fill any gaps. For example if systemd were to return file descriptors
+// corresponding with "udp, tcp, udp", then the slice would contain {net.PacketConn, nil, net.PacketConn}
+func PacketConns() ([]net.PacketConn, error) {
+	files := Files(true)
+	conns := make([]net.PacketConn, len(files))
+
+	for i, f := range files {
+		if pc, err := net.FilePacketConn(f); err == nil {
+			conns[i] = pc
+			f.Close()
+		}
+	}
+	return conns, nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/LICENSE b/vendor/github.com/docker/go-plugins-helpers/LICENSE
new file mode 100644
index 000000000..8f71f43fe
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/LICENSE
@@ -0,0 +1,202 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "{}"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright {yyyy} {name of copyright owner}
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
diff --git a/vendor/github.com/docker/go-plugins-helpers/NOTICE b/vendor/github.com/docker/go-plugins-helpers/NOTICE
new file mode 100644
index 000000000..6e6f469ab
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/NOTICE
@@ -0,0 +1,19 @@
+Docker
+Copyright 2012-2015 Docker, Inc.
+
+This product includes software developed at Docker, Inc. (https://www.docker.com).
+
+This product contains software (https://github.com/kr/pty) developed
+by Keith Rarick, licensed under the MIT License.
+
+The following is courtesy of our legal counsel:
+
+
+Use and transfer of Docker may be subject to certain restrictions by the
+United States and other governments.
+It is your responsibility to ensure that your use and/or transfer does not
+violate applicable laws.
+
+For more information, please see https://www.bis.doc.gov
+
+See also https://www.apache.org/dev/crypto.html and/or seek legal counsel.
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/encoder.go b/vendor/github.com/docker/go-plugins-helpers/sdk/encoder.go
new file mode 100644
index 000000000..195812a44
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/encoder.go
@@ -0,0 +1,37 @@
+package sdk
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+)
+
+// DefaultContentTypeV1_1 is the default content type accepted and sent by the plugins.
+const DefaultContentTypeV1_1 = "application/vnd.docker.plugins.v1.1+json"
+
+// DecodeRequest decodes an http request into a given structure.
+func DecodeRequest(w http.ResponseWriter, r *http.Request, req interface{}) (err error) {
+	if err = json.NewDecoder(r.Body).Decode(req); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+	}
+	return
+}
+
+// EncodeResponse encodes the given structure into an http response.
+func EncodeResponse(w http.ResponseWriter, res interface{}, err bool) {
+	w.Header().Set("Content-Type", DefaultContentTypeV1_1)
+	if err {
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+	json.NewEncoder(w).Encode(res)
+}
+
+// StreamResponse streams a response object to the client
+func StreamResponse(w http.ResponseWriter, data io.ReadCloser) {
+	w.Header().Set("Content-Type", DefaultContentTypeV1_1)
+	if _, err := copyBuf(w, data); err != nil {
+		fmt.Printf("ERROR in stream: %v\n", err)
+	}
+	data.Close()
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/handler.go b/vendor/github.com/docker/go-plugins-helpers/sdk/handler.go
new file mode 100644
index 000000000..c0d042ed0
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/handler.go
@@ -0,0 +1,88 @@
+package sdk
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+)
+
+const activatePath = "/Plugin.Activate"
+
+// Handler is the base to create plugin handlers.
+// It initializes connections and sockets to listen to.
+type Handler struct {
+	mux *http.ServeMux
+}
+
+// NewHandler creates a new Handler with an http mux.
+func NewHandler(manifest string) Handler {
+	mux := http.NewServeMux()
+
+	mux.HandleFunc(activatePath, func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", DefaultContentTypeV1_1)
+		fmt.Fprintln(w, manifest)
+	})
+
+	return Handler{mux: mux}
+}
+
+// Serve sets up the handler to serve requests on the passed in listener
+func (h Handler) Serve(l net.Listener) error {
+	server := http.Server{
+		Addr:    l.Addr().String(),
+		Handler: h.mux,
+	}
+	return server.Serve(l)
+}
+
+// ServeTCP makes the handler to listen for request in a given TCP address.
+// It also writes the spec file in the right directory for docker to read.
+// Due to constrains for running Docker in Docker on Windows, data-root directory
+// of docker daemon must be provided. To get default directory, use
+// WindowsDefaultDaemonRootDir() function. On Unix, this parameter is ignored.
+func (h Handler) ServeTCP(pluginName, addr, daemonDir string, tlsConfig *tls.Config) error {
+	l, spec, err := newTCPListener(addr, pluginName, daemonDir, tlsConfig)
+	if err != nil {
+		return err
+	}
+	if spec != "" {
+		defer os.Remove(spec)
+	}
+	return h.Serve(l)
+}
+
+// ServeUnix makes the handler to listen for requests in a unix socket.
+// It also creates the socket file in the right directory for docker to read.
+func (h Handler) ServeUnix(addr string, gid int) error {
+	l, spec, err := newUnixListener(addr, gid)
+	if err != nil {
+		return err
+	}
+	if spec != "" {
+		defer os.Remove(spec)
+	}
+	return h.Serve(l)
+}
+
+// ServeWindows makes the handler to listen for request in a Windows named pipe.
+// It also creates the spec file in the right directory for docker to read.
+// Due to constrains for running Docker in Docker on Windows, data-root directory
+// of docker daemon must be provided. To get default directory, use
+// WindowsDefaultDaemonRootDir() function. On Unix, this parameter is ignored.
+func (h Handler) ServeWindows(addr, pluginName, daemonDir string, pipeConfig *WindowsPipeConfig) error {
+	l, spec, err := newWindowsListener(addr, pluginName, daemonDir, pipeConfig)
+	if err != nil {
+		return err
+	}
+	if spec != "" {
+		defer os.Remove(spec)
+	}
+	return h.Serve(l)
+}
+
+// HandleFunc registers a function to handle a request path with.
+func (h Handler) HandleFunc(path string, fn func(w http.ResponseWriter, r *http.Request)) {
+	h.mux.HandleFunc(path, fn)
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/pool.go b/vendor/github.com/docker/go-plugins-helpers/sdk/pool.go
new file mode 100644
index 000000000..316775973
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/pool.go
@@ -0,0 +1,18 @@
+package sdk
+
+import (
+	"io"
+	"sync"
+)
+
+const buffer32K = 32 * 1024
+
+var buffer32KPool = &sync.Pool{New: func() interface{} { return make([]byte, buffer32K) }}
+
+// copyBuf uses a shared buffer pool with io.CopyBuffer
+func copyBuf(w io.Writer, r io.Reader) (int64, error) {
+	buf := buffer32KPool.Get().([]byte)
+	written, err := io.CopyBuffer(w, r, buf)
+	buffer32KPool.Put(buf)
+	return written, err
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/spec_file_generator.go b/vendor/github.com/docker/go-plugins-helpers/sdk/spec_file_generator.go
new file mode 100644
index 000000000..bc8cfc644
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/spec_file_generator.go
@@ -0,0 +1,58 @@
+package sdk
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+type protocol string
+
+const (
+	protoTCP       protocol = "tcp"
+	protoNamedPipe protocol = "npipe"
+)
+
+// PluginSpecDir returns plugin spec dir in relation to daemon root directory.
+func PluginSpecDir(daemonRoot string) string {
+	return ([]string{filepath.Join(daemonRoot, "plugins")})[0]
+}
+
+// WindowsDefaultDaemonRootDir returns default data directory of docker daemon on Windows.
+func WindowsDefaultDaemonRootDir() string {
+	return filepath.Join(os.Getenv("programdata"), "docker")
+}
+
+func createPluginSpecDirWindows(name, address, daemonRoot string) (string, error) {
+	_, err := os.Stat(daemonRoot)
+	if os.IsNotExist(err) {
+		return "", fmt.Errorf("Deamon root directory must already exist: %s", err)
+	}
+
+	pluginSpecDir := PluginSpecDir(daemonRoot)
+
+	if err := windowsCreateDirectoryWithACL(pluginSpecDir); err != nil {
+		return "", err
+	}
+	return pluginSpecDir, nil
+}
+
+func createPluginSpecDirUnix(name, address string) (string, error) {
+	pluginSpecDir := PluginSpecDir("/etc/docker")
+	if err := os.MkdirAll(pluginSpecDir, 0755); err != nil {
+		return "", err
+	}
+	return pluginSpecDir, nil
+}
+
+func writeSpecFile(name, address, pluginSpecDir string, proto protocol) (string, error) {
+	specFileDir := filepath.Join(pluginSpecDir, name+".spec")
+
+	url := string(proto) + "://" + address
+	if err := ioutil.WriteFile(specFileDir, []byte(url), 0644); err != nil {
+		return "", err
+	}
+
+	return specFileDir, nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/tcp_listener.go b/vendor/github.com/docker/go-plugins-helpers/sdk/tcp_listener.go
new file mode 100644
index 000000000..bad85f7fd
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/tcp_listener.go
@@ -0,0 +1,34 @@
+package sdk
+
+import (
+	"crypto/tls"
+	"net"
+	"runtime"
+
+	"github.com/docker/go-connections/sockets"
+)
+
+func newTCPListener(address, pluginName, daemonDir string, tlsConfig *tls.Config) (net.Listener, string, error) {
+	listener, err := sockets.NewTCPSocket(address, tlsConfig)
+	if err != nil {
+		return nil, "", err
+	}
+
+	addr := listener.Addr().String()
+
+	var specDir string
+	if runtime.GOOS == "windows" {
+		specDir, err = createPluginSpecDirWindows(pluginName, addr, daemonDir)
+	} else {
+		specDir, err = createPluginSpecDirUnix(pluginName, addr)
+	}
+	if err != nil {
+		return nil, "", err
+	}
+
+	specFile, err := writeSpecFile(pluginName, addr, specDir, protoTCP)
+	if err != nil {
+		return nil, "", err
+	}
+	return listener, specFile, nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener.go b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener.go
new file mode 100644
index 000000000..54b9a6d31
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener.go
@@ -0,0 +1,35 @@
+// +build linux freebsd
+
+package sdk
+
+import (
+	"net"
+	"os"
+	"path/filepath"
+
+	"github.com/docker/go-connections/sockets"
+)
+
+const pluginSockDir = "/run/docker/plugins"
+
+func newUnixListener(pluginName string, gid int) (net.Listener, string, error) {
+	path, err := fullSocketAddress(pluginName)
+	if err != nil {
+		return nil, "", err
+	}
+	listener, err := sockets.NewUnixSocket(path, gid)
+	if err != nil {
+		return nil, "", err
+	}
+	return listener, path, nil
+}
+
+func fullSocketAddress(address string) (string, error) {
+	if err := os.MkdirAll(pluginSockDir, 0755); err != nil {
+		return "", err
+	}
+	if filepath.IsAbs(address) {
+		return address, nil
+	}
+	return filepath.Join(pluginSockDir, address+".sock"), nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_nosystemd.go b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_nosystemd.go
new file mode 100644
index 000000000..a798b8722
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_nosystemd.go
@@ -0,0 +1,10 @@
+// +build linux freebsd
+// +build nosystemd
+
+package sdk
+
+import "net"
+
+func setupSocketActivation() (net.Listener, error) {
+	return nil, nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_systemd.go b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_systemd.go
new file mode 100644
index 000000000..5d5d8f427
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_systemd.go
@@ -0,0 +1,45 @@
+// +build linux freebsd
+// +build !nosystemd
+
+package sdk
+
+import (
+	"fmt"
+	"net"
+	"os"
+
+	"github.com/coreos/go-systemd/activation"
+)
+
+// isRunningSystemd checks whether the host was booted with systemd as its init
+// system. This functions similarly to systemd's `sd_booted(3)`: internally, it
+// checks whether /run/systemd/system/ exists and is a directory.
+// http://www.freedesktop.org/software/systemd/man/sd_booted.html
+//
+// Copied from github.com/coreos/go-systemd/util.IsRunningSystemd
+func isRunningSystemd() bool {
+	fi, err := os.Lstat("/run/systemd/system")
+	if err != nil {
+		return false
+	}
+	return fi.IsDir()
+}
+
+func setupSocketActivation() (net.Listener, error) {
+	if !isRunningSystemd() {
+		return nil, nil
+	}
+	listenFds := activation.Files(false)
+	if len(listenFds) > 1 {
+		return nil, fmt.Errorf("expected only one socket from systemd, got %d", len(listenFds))
+	}
+	var listener net.Listener
+	if len(listenFds) == 1 {
+		l, err := net.FileListener(listenFds[0])
+		if err != nil {
+			return nil, err
+		}
+		listener = l
+	}
+	return listener, nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_unsupported.go b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_unsupported.go
new file mode 100644
index 000000000..344cf751b
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_unsupported.go
@@ -0,0 +1,16 @@
+// +build !linux,!freebsd
+
+package sdk
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	errOnlySupportedOnLinuxAndFreeBSD = errors.New("unix socket creation is only supported on Linux and FreeBSD")
+)
+
+func newUnixListener(pluginName string, gid int) (net.Listener, string, error) {
+	return nil, "", errOnlySupportedOnLinuxAndFreeBSD
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener.go b/vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener.go
new file mode 100644
index 000000000..b5deaba6d
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener.go
@@ -0,0 +1,70 @@
+// +build windows
+
+package sdk
+
+import (
+	"net"
+	"os"
+	"syscall"
+	"unsafe"
+
+	"github.com/Microsoft/go-winio"
+)
+
+// Named pipes use Windows Security Descriptor Definition Language to define ACL. Following are
+// some useful definitions.
+const (
+	// This will set permissions for everyone to have full access
+	AllowEveryone = "S:(ML;;NW;;;LW)D:(A;;0x12019f;;;WD)"
+
+	// This will set permissions for Service, System, Adminstrator group and account to have full access
+	AllowServiceSystemAdmin = "D:(A;ID;FA;;;SY)(A;ID;FA;;;BA)(A;ID;FA;;;LA)(A;ID;FA;;;LS)"
+)
+
+func newWindowsListener(address, pluginName, daemonRoot string, pipeConfig *WindowsPipeConfig) (net.Listener, string, error) {
+	winioPipeConfig := winio.PipeConfig{
+		SecurityDescriptor: pipeConfig.SecurityDescriptor,
+		InputBufferSize:    pipeConfig.InBufferSize,
+		OutputBufferSize:   pipeConfig.OutBufferSize,
+	}
+	listener, err := winio.ListenPipe(address, &winioPipeConfig)
+	if err != nil {
+		return nil, "", err
+	}
+
+	addr := listener.Addr().String()
+
+	specDir, err := createPluginSpecDirWindows(pluginName, addr, daemonRoot)
+	if err != nil {
+		return nil, "", err
+	}
+
+	spec, err := writeSpecFile(pluginName, addr, specDir, protoNamedPipe)
+	if err != nil {
+		return nil, "", err
+	}
+	return listener, spec, nil
+}
+
+func windowsCreateDirectoryWithACL(name string) error {
+	sa := syscall.SecurityAttributes{Length: 0}
+	sddl := "D:P(A;OICI;GA;;;BA)(A;OICI;GA;;;SY)"
+	sd, err := winio.SddlToSecurityDescriptor(sddl)
+	if err != nil {
+		return &os.PathError{Op: "mkdir", Path: name, Err: err}
+	}
+	sa.Length = uint32(unsafe.Sizeof(sa))
+	sa.InheritHandle = 1
+	sa.SecurityDescriptor = uintptr(unsafe.Pointer(&sd[0]))
+
+	namep, err := syscall.UTF16PtrFromString(name)
+	if err != nil {
+		return &os.PathError{Op: "mkdir", Path: name, Err: err}
+	}
+
+	e := syscall.CreateDirectory(namep, &sa)
+	if e != nil {
+		return &os.PathError{Op: "mkdir", Path: name, Err: e}
+	}
+	return nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener_unsupported.go b/vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener_unsupported.go
new file mode 100644
index 000000000..0f5e113c1
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener_unsupported.go
@@ -0,0 +1,20 @@
+// +build !windows
+
+package sdk
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	errOnlySupportedOnWindows = errors.New("named pipe creation is only supported on Windows")
+)
+
+func newWindowsListener(address, pluginName, daemonRoot string, pipeConfig *WindowsPipeConfig) (net.Listener, string, error) {
+	return nil, "", errOnlySupportedOnWindows
+}
+
+func windowsCreateDirectoryWithACL(name string) error {
+	return nil
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/sdk/windows_pipe_config.go b/vendor/github.com/docker/go-plugins-helpers/sdk/windows_pipe_config.go
new file mode 100644
index 000000000..256fa3d67
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/sdk/windows_pipe_config.go
@@ -0,0 +1,13 @@
+package sdk
+
+// WindowsPipeConfig is a helper structure for configuring named pipe parameters on Windows.
+type WindowsPipeConfig struct {
+	// SecurityDescriptor contains a Windows security descriptor in SDDL format.
+	SecurityDescriptor string
+
+	// InBufferSize in bytes.
+	InBufferSize int32
+
+	// OutBufferSize in bytes.
+	OutBufferSize int32
+}
diff --git a/vendor/github.com/docker/go-plugins-helpers/volume/README.md b/vendor/github.com/docker/go-plugins-helpers/volume/README.md
new file mode 100644
index 000000000..395aa643f
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/volume/README.md
@@ -0,0 +1,36 @@
+# Docker volume extension api.
+
+Go handler to create external volume extensions for Docker.
+
+## Usage
+
+This library is designed to be integrated in your program.
+
+1. Implement the `volume.Driver` interface.
+2. Initialize a `volume.Handler` with your implementation.
+3. Call either `ServeTCP` or `ServeUnix` from the `volume.Handler`.
+
+### Example using TCP sockets:
+
+```go
+  d := MyVolumeDriver{}
+  h := volume.NewHandler(d)
+  h.ServeTCP("test_volume", ":8080")
+```
+
+### Example using Unix sockets:
+
+```go
+  d := MyVolumeDriver{}
+  h := volume.NewHandler(d)
+  u, _ := user.Lookup("root")
+  gid, _ := strconv.Atoi(u.Gid)
+  h.ServeUnix("test_volume", gid)
+```
+
+## Full example plugins
+
+- https://github.com/calavera/docker-volume-glusterfs
+- https://github.com/calavera/docker-volume-keywhiz
+- https://github.com/quobyte/docker-volume
+- https://github.com/NimbleStorage/Nemo
diff --git a/vendor/github.com/docker/go-plugins-helpers/volume/api.go b/vendor/github.com/docker/go-plugins-helpers/volume/api.go
new file mode 100644
index 000000000..dcc2f3abf
--- /dev/null
+++ b/vendor/github.com/docker/go-plugins-helpers/volume/api.go
@@ -0,0 +1,230 @@
+package volume
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/docker/go-plugins-helpers/sdk"
+)
+
+const (
+	// DefaultDockerRootDirectory is the default directory where volumes will be created.
+	DefaultDockerRootDirectory = "/var/lib/docker-volumes"
+
+	manifest         = `{"Implements": ["VolumeDriver"]}`
+	createPath       = "/VolumeDriver.Create"
+	getPath          = "/VolumeDriver.Get"
+	listPath         = "/VolumeDriver.List"
+	removePath       = "/VolumeDriver.Remove"
+	hostVirtualPath  = "/VolumeDriver.Path"
+	mountPath        = "/VolumeDriver.Mount"
+	unmountPath      = "/VolumeDriver.Unmount"
+	capabilitiesPath = "/VolumeDriver.Capabilities"
+)
+
+// CreateRequest is the structure that docker's requests are deserialized to.
+type CreateRequest struct {
+	Name    string
+	Options map[string]string `json:"Opts,omitempty"`
+}
+
+// RemoveRequest structure for a volume remove request
+type RemoveRequest struct {
+	Name string
+}
+
+// MountRequest structure for a volume mount request
+type MountRequest struct {
+	Name string
+	ID   string
+}
+
+// MountResponse structure for a volume mount response
+type MountResponse struct {
+	Mountpoint string
+}
+
+// UnmountRequest structure for a volume unmount request
+type UnmountRequest struct {
+	Name string
+	ID   string
+}
+
+// PathRequest structure for a volume path request
+type PathRequest struct {
+	Name string
+}
+
+// PathResponse structure for a volume path response
+type PathResponse struct {
+	Mountpoint string
+}
+
+// GetRequest structure for a volume get request
+type GetRequest struct {
+	Name string
+}
+
+// GetResponse structure for a volume get response
+type GetResponse struct {
+	Volume *Volume
+}
+
+// ListResponse structure for a volume list response
+type ListResponse struct {
+	Volumes []*Volume
+}
+
+// CapabilitiesResponse structure for a volume capability response
+type CapabilitiesResponse struct {
+	Capabilities Capability
+}
+
+// Volume represents a volume object for use with `Get` and `List` requests
+type Volume struct {
+	Name       string
+	Mountpoint string                 `json:",omitempty"`
+	CreatedAt  string                 `json:",omitempty"`
+	Status     map[string]interface{} `json:",omitempty"`
+}
+
+// Capability represents the list of capabilities a volume driver can return
+type Capability struct {
+	Scope string
+}
+
+// ErrorResponse is a formatted error message that docker can understand
+type ErrorResponse struct {
+	Err string
+}
+
+// NewErrorResponse creates an ErrorResponse with the provided message
+func NewErrorResponse(msg string) *ErrorResponse {
+	return &ErrorResponse{Err: msg}
+}
+
+// Driver represent the interface a driver must fulfill.
+type Driver interface {
+	Create(*CreateRequest) error
+	List() (*ListResponse, error)
+	Get(*GetRequest) (*GetResponse, error)
+	Remove(*RemoveRequest) error
+	Path(*PathRequest) (*PathResponse, error)
+	Mount(*MountRequest) (*MountResponse, error)
+	Unmount(*UnmountRequest) error
+	Capabilities() *CapabilitiesResponse
+}
+
+// Handler forwards requests and responses between the docker daemon and the plugin.
+type Handler struct {
+	driver Driver
+	sdk.Handler
+}
+
+// NewHandler initializes the request handler with a driver implementation.
+func NewHandler(driver Driver) *Handler {
+	h := &Handler{driver, sdk.NewHandler(manifest)}
+	h.initMux()
+	return h
+}
+
+func (h *Handler) initMux() {
+	h.HandleFunc(createPath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers createPath")
+		req := &CreateRequest{}
+		err := sdk.DecodeRequest(w, r, req)
+		if err != nil {
+			return
+		}
+		err = h.driver.Create(req)
+		if err != nil {
+			sdk.EncodeResponse(w, NewErrorResponse(err.Error()), true)
+			return
+		}
+		sdk.EncodeResponse(w, struct{}{}, false)
+	})
+	h.HandleFunc(removePath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers removePath")
+		req := &RemoveRequest{}
+		err := sdk.DecodeRequest(w, r, req)
+		if err != nil {
+			return
+		}
+		err = h.driver.Remove(req)
+		if err != nil {
+			sdk.EncodeResponse(w, NewErrorResponse(err.Error()), true)
+			return
+		}
+		sdk.EncodeResponse(w, struct{}{}, false)
+	})
+	h.HandleFunc(mountPath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers mountPath")
+		req := &MountRequest{}
+		err := sdk.DecodeRequest(w, r, req)
+		if err != nil {
+			return
+		}
+		res, err := h.driver.Mount(req)
+		if err != nil {
+			sdk.EncodeResponse(w, NewErrorResponse(err.Error()), true)
+			return
+		}
+		sdk.EncodeResponse(w, res, false)
+	})
+	h.HandleFunc(hostVirtualPath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers hostVirtualPath")
+		req := &PathRequest{}
+		err := sdk.DecodeRequest(w, r, req)
+		if err != nil {
+			return
+		}
+		res, err := h.driver.Path(req)
+		if err != nil {
+			sdk.EncodeResponse(w, NewErrorResponse(err.Error()), true)
+			return
+		}
+		sdk.EncodeResponse(w, res, false)
+	})
+	h.HandleFunc(getPath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers getPath")
+		req := &GetRequest{}
+		err := sdk.DecodeRequest(w, r, req)
+		if err != nil {
+			return
+		}
+		res, err := h.driver.Get(req)
+		if err != nil {
+			sdk.EncodeResponse(w, NewErrorResponse(err.Error()), true)
+			return
+		}
+		sdk.EncodeResponse(w, res, false)
+	})
+	h.HandleFunc(unmountPath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers unmountPath")
+		req := &UnmountRequest{}
+		err := sdk.DecodeRequest(w, r, req)
+		if err != nil {
+			return
+		}
+		err = h.driver.Unmount(req)
+		if err != nil {
+			sdk.EncodeResponse(w, NewErrorResponse(err.Error()), true)
+			return
+		}
+		sdk.EncodeResponse(w, struct{}{}, false)
+	})
+	h.HandleFunc(listPath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers listPath")
+		res, err := h.driver.List()
+		if err != nil {
+			sdk.EncodeResponse(w, NewErrorResponse(err.Error()), true)
+			return
+		}
+		sdk.EncodeResponse(w, res, false)
+	})
+
+	h.HandleFunc(capabilitiesPath, func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Entering go-plugins-helpers capabilitiesPath")
+		sdk.EncodeResponse(w, h.driver.Capabilities(), false)
+	})
+}