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Merge pull request #8357 from mheon/add_volume_interface_package

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Add API for communicating with Docker volume plugins
This commit is contained in:
OpenShift Merge Robot
2020-12-01 22:32:08 +01:00
committed by GitHub
parent c71ad9a557 594ac4a146
commit 7f084a8ae2
26 changed files with 1807 additions and 3 deletions
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1
go.mod
View File

@ -23,6 +23,7 @@ require (
github.com/docker/distribution v2.7.1+incompatible github.com/docker/distribution v2.7.1+incompatible
github.com/docker/docker v17.12.0-ce-rc1.0.20201020191947-73dc6a680cdd+incompatible github.com/docker/docker v17.12.0-ce-rc1.0.20201020191947-73dc6a680cdd+incompatible
github.com/docker/go-connections v0.4.0 github.com/docker/go-connections v0.4.0
github.com/docker/go-plugins-helpers v0.0.0-20200102110956-c9a8a2d92ccc
github.com/docker/go-units v0.4.0 github.com/docker/go-units v0.4.0
github.com/fsnotify/fsnotify v1.4.9 github.com/fsnotify/fsnotify v1.4.9
github.com/ghodss/yaml v1.0.0 github.com/ghodss/yaml v1.0.0

2
go.sum
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@ -150,6 +150,8 @@ github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKoh
github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec= github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
github.com/docker/go-metrics v0.0.1 h1:AgB/0SvBxihN0X8OR4SjsblXkbMvalQ8cjmtKQ2rQV8= github.com/docker/go-metrics v0.0.1 h1:AgB/0SvBxihN0X8OR4SjsblXkbMvalQ8cjmtKQ2rQV8=
github.com/docker/go-metrics v0.0.1/go.mod h1:cG1hvH2utMXtqgqqYE9plW6lDxS3/5ayHzueweSI3Vw= github.com/docker/go-metrics v0.0.1/go.mod h1:cG1hvH2utMXtqgqqYE9plW6lDxS3/5ayHzueweSI3Vw=
github.com/docker/go-plugins-helpers v0.0.0-20200102110956-c9a8a2d92ccc h1:/A+mPcpajLsWiX9gSnzdVKM/IzZoYiNqXHe83z50k2c=
github.com/docker/go-plugins-helpers v0.0.0-20200102110956-c9a8a2d92ccc/go.mod h1:LFyLie6XcDbyKGeVK6bHe+9aJTYCxWLBg5IrJZOaXKA=
github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw= github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk= github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
github.com/docker/libnetwork v0.8.0-dev.2.0.20190625141545-5a177b73e316 h1:moehPjPiGUaWdwgOl92xRyFHJyaqXDHcCyW9M6nmCK4= github.com/docker/libnetwork v0.8.0-dev.2.0.20190625141545-5a177b73e316 h1:moehPjPiGUaWdwgOl92xRyFHJyaqXDHcCyW9M6nmCK4=

13
libpod/options.go
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@ -1547,12 +1547,19 @@ func WithVolumeDriver(driver string) VolumeCreateOption {
if volume.valid { if volume.valid {
return define.ErrVolumeFinalized return define.ErrVolumeFinalized
} }
// only local driver is possible rn
// Uncomment when volume plugins are ready for use.
// if driver != define.VolumeDriverLocal {
// if _, err := plugin.GetVolumePlugin(driver); err != nil {
// return err
// }
// }
if driver != define.VolumeDriverLocal { if driver != define.VolumeDriverLocal {
return define.ErrNotImplemented return define.ErrNotImplemented
} }
volume.config.Driver = define.VolumeDriverLocal
volume.config.Driver = driver
return nil return nil
} }
} }

454
libpod/plugin/volume_api.go Normal file
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@ -0,0 +1,454 @@
package plugin
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strings"
"sync"
"time"
"github.com/containers/podman/v2/libpod/define"
"github.com/docker/go-plugins-helpers/sdk"
"github.com/docker/go-plugins-helpers/volume"
jsoniter "github.com/json-iterator/go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
var json = jsoniter.ConfigCompatibleWithStandardLibrary
// TODO: We should add syntax for specifying plugins to containers.conf, and
// support for loading based on that.
// Copied from docker/go-plugins-helpers/volume/api.go - not exported, so we
// need to do this to get at them.
// These are well-established paths that should not change unless the plugin API
// version changes.
var (
activatePath = "/Plugin.Activate"
createPath = "/VolumeDriver.Create"
getPath = "/VolumeDriver.Get"
listPath = "/VolumeDriver.List"
removePath = "/VolumeDriver.Remove"
hostVirtualPath = "/VolumeDriver.Path"
mountPath = "/VolumeDriver.Mount"
unmountPath = "/VolumeDriver.Unmount"
// nolint
capabilitiesPath = "/VolumeDriver.Capabilities"
)
const (
defaultTimeout = 5 * time.Second
defaultPath = "/run/docker/plugins"
volumePluginType = "VolumeDriver"
)
var (
ErrNotPlugin = errors.New("target does not appear to be a valid plugin")
ErrNotVolumePlugin = errors.New("plugin is not a volume plugin")
ErrPluginRemoved = errors.New("plugin is no longer available (shut down?)")
// This stores available, initialized volume plugins.
pluginsLock sync.Mutex
plugins map[string]*VolumePlugin
)
// VolumePlugin is a single volume plugin.
type VolumePlugin struct {
// Name is the name of the volume plugin. This will be used to refer to
// it.
Name string
// SocketPath is the unix socket at which the plugin is accessed.
SocketPath string
}
// This is the response from the activate endpoint of the API.
type activateResponse struct {
Implements []string
}
// Validate that the given plugin is good to use.
// Add it to available plugins if so.
func validatePlugin(newPlugin *VolumePlugin) error {
// It's a socket. Is it a plugin?
// Hit the Activate endpoint to find out if it is, and if so what kind
req, err := http.NewRequest("POST", activatePath, nil)
if err != nil {
return errors.Wrapf(err, "error making request to volume plugin %s activation endpoint", newPlugin.Name)
}
req.Header.Set("Host", newPlugin.getURI())
req.Header.Set("Content-Type", sdk.DefaultContentTypeV1_1)
client := new(http.Client)
client.Timeout = defaultTimeout
resp, err := client.Do(req)
if err != nil {
return errors.Wrapf(err, "error sending request to plugin %s activation endpoint", newPlugin.Name)
}
defer resp.Body.Close()
// Response code MUST be 200. Anything else, we have to assume it's not
// a valid plugin.
if resp.StatusCode != 200 {
return errors.Wrapf(ErrNotPlugin, "got status code %d from activation endpoint for plugin %s", resp.StatusCode, newPlugin.Name)
}
// Read and decode the body so we can tell if this is a volume plugin.
respBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return errors.Wrapf(err, "error reading activation response body from plugin %s", newPlugin.Name)
}
respStruct := new(activateResponse)
if err := json.Unmarshal(respBytes, respStruct); err != nil {
return errors.Wrapf(err, "error unmarshalling plugin %s activation response", newPlugin.Name)
}
foundVolume := false
for _, pluginType := range respStruct.Implements {
if pluginType == volumePluginType {
foundVolume = true
break
}
}
if !foundVolume {
return errors.Wrapf(ErrNotVolumePlugin, "plugin %s does not implement volume plugin, instead provides %s", newPlugin.Name, strings.Join(respStruct.Implements, ", "))
}
plugins[newPlugin.Name] = newPlugin
return nil
}
// GetVolumePlugin gets a single volume plugin by path.
// TODO: We should not be auto-completing based on a default path; we should
// require volumes to have been pre-specified in containers.conf (will need a
// function to pre-populate the plugins list, and we should probably do a lazy
// initialization there to not slow things down too much).
func GetVolumePlugin(name string) (*VolumePlugin, error) {
pluginsLock.Lock()
defer pluginsLock.Unlock()
plugin, exists := plugins[name]
if exists {
return plugin, nil
}
// It's not cached. We need to get it.
newPlugin := new(VolumePlugin)
newPlugin.Name = name
newPlugin.SocketPath = filepath.Join(defaultPath, fmt.Sprintf("%s.sock", name))
stat, err := os.Stat(newPlugin.SocketPath)
if err != nil {
return nil, errors.Wrapf(err, "cannot access plugin %s socket %q", name, newPlugin.SocketPath)
}
if stat.Mode()&os.ModeSocket == 0 {
return nil, errors.Wrapf(ErrNotPlugin, "volume %s path %q is not a unix socket", name, newPlugin.SocketPath)
}
if err := validatePlugin(newPlugin); err != nil {
return nil, err
}
return newPlugin, nil
}
func (p *VolumePlugin) getURI() string {
return "unix://" + p.SocketPath
}
// Verify the plugin is still available.
// TODO: Do we want to ping with an HTTP request? There's no ping endpoint so
// we'd need to hit Activate or Capabilities?
func (p *VolumePlugin) verifyReachable() error {
if _, err := os.Stat(p.SocketPath); err != nil {
if os.IsNotExist(err) {
pluginsLock.Lock()
defer pluginsLock.Unlock()
delete(plugins, p.Name)
return errors.Wrapf(ErrPluginRemoved, p.Name)
}
return errors.Wrapf(err, "error accessing plugin %s", p.Name)
}
return nil
}
// Send a request to the volume plugin for handling.
func (p *VolumePlugin) sendRequest(toJSON interface{}, hasBody bool, endpoint string) (*http.Response, error) {
var (
reqJSON []byte
err error
)
if hasBody {
reqJSON, err = json.Marshal(toJSON)
if err != nil {
return nil, errors.Wrapf(err, "error marshalling request JSON for volume plugin %s endpoint %s", p.Name, endpoint)
}
}
req, err := http.NewRequest("POST", endpoint, bytes.NewReader(reqJSON))
if err != nil {
return nil, errors.Wrapf(err, "error making request to volume plugin %s endpoint %s", p.Name, endpoint)
}
req.Header.Set("Host", p.getURI())
req.Header.Set("Content-Type", sdk.DefaultContentTypeV1_1)
client := new(http.Client)
client.Timeout = defaultTimeout
resp, err := client.Do(req)
if err != nil {
return nil, errors.Wrapf(err, "error sending request to volume plugin %s endpoint %s", p.Name, endpoint)
}
defer resp.Body.Close()
return resp, nil
}
// Turn an error response from a volume plugin into a well-formatted Go error.
func (p *VolumePlugin) makeErrorResponse(err, endpoint, volName string) error {
if err == "" {
err = "empty error from plugin"
}
if volName != "" {
return errors.Wrapf(errors.New(err), "error on %s on volume %s in volume plugin %s", endpoint, volName, p.Name)
} else {
return errors.Wrapf(errors.New(err), "error on %s in volume plugin %s", endpoint, p.Name)
}
}
// Handle error responses from plugin
func (p *VolumePlugin) handleErrorResponse(resp *http.Response, endpoint, volName string) error {
// The official plugin reference implementation uses HTTP 500 for
// errors, but I don't think we can guarantee all plugins do that.
// Let's interpret anything other than 200 as an error.
// If there isn't an error, don't even bother decoding the response.
if resp.StatusCode != 200 {
errResp, err := ioutil.ReadAll(resp.Body)
if err != nil {
return errors.Wrapf(err, "error reading response body from volume plugin %s", p.Name)
}
errStruct := new(volume.ErrorResponse)
if err := json.Unmarshal(errResp, errStruct); err != nil {
return errors.Wrapf(err, "error unmarshalling JSON response from volume plugin %s", p.Name)
}
return p.makeErrorResponse(errStruct.Err, endpoint, volName)
}
return nil
}
// CreateVolume creates a volume in the plugin.
func (p *VolumePlugin) CreateVolume(req *volume.CreateRequest) error {
if req == nil {
return errors.Wrapf(define.ErrInvalidArg, "must provide non-nil request to CreateVolume")
}
if err := p.verifyReachable(); err != nil {
return err
}
logrus.Infof("Creating volume %s using plugin %s", req.Name, p.Name)
resp, err := p.sendRequest(req, true, createPath)
if err != nil {
return err
}
defer resp.Body.Close()
return p.handleErrorResponse(resp, createPath, req.Name)
}
// ListVolumes lists volumes available in the plugin.
func (p *VolumePlugin) ListVolumes() ([]*volume.Volume, error) {
if err := p.verifyReachable(); err != nil {
return nil, err
}
logrus.Infof("Listing volumes using plugin %s", p.Name)
resp, err := p.sendRequest(nil, false, listPath)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if err := p.handleErrorResponse(resp, listPath, ""); err != nil {
return nil, err
}
// TODO: Can probably unify response reading under a helper
volumeRespBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrapf(err, "error reading response body from volume plugin %s", p.Name)
}
volumeResp := new(volume.ListResponse)
if err := json.Unmarshal(volumeRespBytes, volumeResp); err != nil {
return nil, errors.Wrapf(err, "error unmarshalling volume plugin %s list response", p.Name)
}
return volumeResp.Volumes, nil
}
// GetVolume gets a single volume from the plugin.
func (p *VolumePlugin) GetVolume(req *volume.GetRequest) (*volume.Volume, error) {
if req == nil {
return nil, errors.Wrapf(define.ErrInvalidArg, "must provide non-nil request to GetVolume")
}
if err := p.verifyReachable(); err != nil {
return nil, err
}
logrus.Infof("Getting volume %s using plugin %s", req.Name, p.Name)
resp, err := p.sendRequest(req, true, getPath)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if err := p.handleErrorResponse(resp, getPath, req.Name); err != nil {
return nil, err
}
getRespBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrapf(err, "error reading response body from volume plugin %s", p.Name)
}
getResp := new(volume.GetResponse)
if err := json.Unmarshal(getRespBytes, getResp); err != nil {
return nil, errors.Wrapf(err, "error unmarshalling volume plugin %s get response", p.Name)
}
return getResp.Volume, nil
}
// RemoveVolume removes a single volume from the plugin.
func (p *VolumePlugin) RemoveVolume(req *volume.RemoveRequest) error {
if req == nil {
return errors.Wrapf(define.ErrInvalidArg, "must provide non-nil request to RemoveVolume")
}
if err := p.verifyReachable(); err != nil {
return err
}
logrus.Infof("Removing volume %s using plugin %s", req.Name, p.Name)
resp, err := p.sendRequest(req, true, removePath)
if err != nil {
return err
}
defer resp.Body.Close()
return p.handleErrorResponse(resp, removePath, req.Name)
}
// GetVolumePath gets the path the given volume is mounted at.
func (p *VolumePlugin) GetVolumePath(req *volume.PathRequest) (string, error) {
if req == nil {
return "", errors.Wrapf(define.ErrInvalidArg, "must provide non-nil request to GetVolumePath")
}
if err := p.verifyReachable(); err != nil {
return "", err
}
logrus.Infof("Getting volume %s path using plugin %s", req.Name, p.Name)
resp, err := p.sendRequest(req, true, hostVirtualPath)
if err != nil {
return "", err
}
defer resp.Body.Close()
if err := p.handleErrorResponse(resp, hostVirtualPath, req.Name); err != nil {
return "", err
}
pathRespBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", errors.Wrapf(err, "error reading response body from volume plugin %s", p.Name)
}
pathResp := new(volume.PathResponse)
if err := json.Unmarshal(pathRespBytes, pathResp); err != nil {
return "", errors.Wrapf(err, "error unmarshalling volume plugin %s path response", p.Name)
}
return pathResp.Mountpoint, nil
}
// MountVolume mounts the given volume. The ID argument is the ID of the
// mounting container, used for internal record-keeping by the plugin. Returns
// the path the volume has been mounted at.
func (p *VolumePlugin) MountVolume(req *volume.MountRequest) (string, error) {
if req == nil {
return "", errors.Wrapf(define.ErrInvalidArg, "must provide non-nil request to MountVolume")
}
if err := p.verifyReachable(); err != nil {
return "", err
}
logrus.Infof("Mounting volume %s using plugin %s for container %s", req.Name, p.Name, req.ID)
resp, err := p.sendRequest(req, true, mountPath)
if err != nil {
return "", err
}
defer resp.Body.Close()
if err := p.handleErrorResponse(resp, mountPath, req.Name); err != nil {
return "", err
}
mountRespBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", errors.Wrapf(err, "error reading response body from volume plugin %s", p.Name)
}
mountResp := new(volume.MountResponse)
if err := json.Unmarshal(mountRespBytes, mountResp); err != nil {
return "", errors.Wrapf(err, "error unmarshalling volume plugin %s path response", p.Name)
}
return mountResp.Mountpoint, nil
}
// UnmountVolume unmounts the given volume. The ID argument is the ID of the
// container that is unmounting, used for internal record-keeping by the plugin.
func (p *VolumePlugin) UnmountVolume(req *volume.UnmountRequest) error {
if req == nil {
return errors.Wrapf(define.ErrInvalidArg, "must provide non-nil request to UnmountVolume")
}
if err := p.verifyReachable(); err != nil {
return err
}
logrus.Infof("Unmounting volume %s using plugin %s for container %s", req.Name, p.Name, req.ID)
resp, err := p.sendRequest(req, true, unmountPath)
if err != nil {
return err
}
defer resp.Body.Close()
return p.handleErrorResponse(resp, unmountPath, req.Name)
}

191
vendor/github.com/coreos/go-systemd/LICENSE generated vendored Normal file
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@ -0,0 +1,191 @@
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http://www.apache.org/licenses/
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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.

5
vendor/github.com/coreos/go-systemd/NOTICE generated vendored Normal file
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@ -0,0 +1,5 @@
CoreOS Project
Copyright 2018 CoreOS, Inc
This product includes software developed at CoreOS, Inc.
(http://www.coreos.com/).

67
vendor/github.com/coreos/go-systemd/activation/files.go generated vendored Normal file
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// 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
}

103
vendor/github.com/coreos/go-systemd/activation/listeners.go generated vendored Normal file
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// 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
}

38
vendor/github.com/coreos/go-systemd/activation/packetconns.go generated vendored Normal file
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// 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
}

202
vendor/github.com/docker/go-plugins-helpers/LICENSE generated vendored Normal file
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@ -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.

19
vendor/github.com/docker/go-plugins-helpers/NOTICE generated vendored Normal file
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@ -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.

37
vendor/github.com/docker/go-plugins-helpers/sdk/encoder.go generated vendored Normal file
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@ -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()
}

88
vendor/github.com/docker/go-plugins-helpers/sdk/handler.go generated vendored Normal file
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@ -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)
}

18
vendor/github.com/docker/go-plugins-helpers/sdk/pool.go generated vendored Normal file
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@ -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
}

58
vendor/github.com/docker/go-plugins-helpers/sdk/spec_file_generator.go generated vendored Normal file
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@ -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
}

34
vendor/github.com/docker/go-plugins-helpers/sdk/tcp_listener.go generated vendored Normal file
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@ -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
}

35
vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener.go generated vendored Normal file
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@ -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
}

10
vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_nosystemd.go generated vendored Normal file
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@ -0,0 +1,10 @@
// +build linux freebsd
// +build nosystemd
package sdk
import "net"
func setupSocketActivation() (net.Listener, error) {
return nil, nil
}

45
vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_systemd.go generated vendored Normal file
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@ -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
}

16
vendor/github.com/docker/go-plugins-helpers/sdk/unix_listener_unsupported.go generated vendored Normal file
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@ -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
}

70
vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener.go generated vendored Normal file
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@ -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
}

20
vendor/github.com/docker/go-plugins-helpers/sdk/windows_listener_unsupported.go generated vendored Normal file
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@ -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
}

13
vendor/github.com/docker/go-plugins-helpers/sdk/windows_pipe_config.go generated vendored Normal file
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@ -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
}

36
vendor/github.com/docker/go-plugins-helpers/volume/README.md generated vendored Normal file
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@ -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

230
vendor/github.com/docker/go-plugins-helpers/volume/api.go generated vendored Normal file
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@ -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)
})
}

5
vendor/modules.txt vendored
View File

@ -211,6 +211,8 @@ github.com/containers/storage/pkg/truncindex
github.com/containers/storage/pkg/unshare github.com/containers/storage/pkg/unshare
# github.com/coreos/go-iptables v0.4.5 # github.com/coreos/go-iptables v0.4.5
github.com/coreos/go-iptables/iptables github.com/coreos/go-iptables/iptables
# github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
github.com/coreos/go-systemd/activation
# github.com/coreos/go-systemd/v22 v22.1.0 # github.com/coreos/go-systemd/v22 v22.1.0
github.com/coreos/go-systemd/v22/activation github.com/coreos/go-systemd/v22/activation
github.com/coreos/go-systemd/v22/daemon github.com/coreos/go-systemd/v22/daemon
@ -276,6 +278,9 @@ github.com/docker/go-connections/sockets
github.com/docker/go-connections/tlsconfig github.com/docker/go-connections/tlsconfig
# github.com/docker/go-metrics v0.0.1 # github.com/docker/go-metrics v0.0.1
github.com/docker/go-metrics github.com/docker/go-metrics
# github.com/docker/go-plugins-helpers v0.0.0-20200102110956-c9a8a2d92ccc
github.com/docker/go-plugins-helpers/sdk
github.com/docker/go-plugins-helpers/volume
# github.com/docker/go-units v0.4.0 # github.com/docker/go-units v0.4.0
github.com/docker/go-units github.com/docker/go-units
# github.com/docker/libnetwork v0.8.0-dev.2.0.20190625141545-5a177b73e316 # github.com/docker/libnetwork v0.8.0-dev.2.0.20190625141545-5a177b73e316