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/*
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Copyright © 2020-2021 The k3d Author(s)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package docker
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import (
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"archive/tar"
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"bytes"
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"context"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/docker/cli/cli/connhelper"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/filters"
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"github.com/docker/docker/client"
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"github.com/docker/docker/pkg/archive"
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"github.com/pkg/errors"
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runtimeErrors "github.com/rancher/k3d/v4/pkg/runtimes/errors"
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k3d "github.com/rancher/k3d/v4/pkg/types"
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log "github.com/sirupsen/logrus"
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)
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// GetDefaultObjectLabelsFilter returns docker type filters created from k3d labels
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func GetDefaultObjectLabelsFilter(clusterName string) filters.Args {
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filters := filters.NewArgs()
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for key, value := range k3d.DefaultObjectLabels {
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filters.Add("label", fmt.Sprintf("%s=%s", key, value))
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}
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filters.Add("label", fmt.Sprintf("%s=%s", k3d.LabelClusterName, clusterName))
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return filters
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}
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// CopyToNode copies a file from the local FS to the selected node
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func (d Docker) CopyToNode(ctx context.Context, src string, dest string, node *k3d.Node) error {
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// create docker client
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docker, err := GetDockerClient()
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if err != nil {
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log.Errorln("Failed to create docker client")
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return err
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}
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defer docker.Close()
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container, err := getNodeContainer(ctx, node)
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if err != nil {
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log.Errorf("Failed to find container for target node '%s'", node.Name)
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return err
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}
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// source: docker/cli/cli/command/container/cp
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srcInfo, err := archive.CopyInfoSourcePath(src, false)
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if err != nil {
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log.Errorln("Failed to copy info source path")
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return err
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}
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srcArchive, err := archive.TarResource(srcInfo)
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if err != nil {
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log.Errorln("Failed to create tar resource")
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return err
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}
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defer srcArchive.Close()
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destInfo := archive.CopyInfo{Path: dest}
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destStat, _ := docker.ContainerStatPath(ctx, container.ID, dest) // don't blame me, docker is also not doing anything if err != nil ¯\_(ツ)_/¯
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destInfo.Exists, destInfo.IsDir = true, destStat.Mode.IsDir()
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destDir, preparedArchive, err := archive.PrepareArchiveCopy(srcArchive, srcInfo, destInfo)
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if err != nil {
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log.Errorln("Failed to prepare archive")
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return err
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}
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defer preparedArchive.Close()
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return docker.CopyToContainer(ctx, container.ID, destDir, preparedArchive, types.CopyToContainerOptions{AllowOverwriteDirWithFile: false})
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}
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// WriteToNode writes a byte array to the selected node
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func (d Docker) WriteToNode(ctx context.Context, content []byte, dest string, mode os.FileMode, node *k3d.Node) error {
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nodeContainer, err := getNodeContainer(ctx, node)
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if err != nil {
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return fmt.Errorf("Failed to find container for node '%s': %+v", node.Name, err)
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}
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// create docker client
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docker, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
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if err != nil {
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log.Errorln("Failed to create docker client")
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return err
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}
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defer docker.Close()
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buf := new(bytes.Buffer)
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tarWriter := tar.NewWriter(buf)
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defer tarWriter.Close()
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tarHeader := &tar.Header{
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Name: dest,
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Mode: int64(mode),
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Size: int64(len(content)),
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}
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if err := tarWriter.WriteHeader(tarHeader); err != nil {
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return fmt.Errorf("Failed to write tar header: %+v", err)
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}
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if _, err := tarWriter.Write(content); err != nil {
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return fmt.Errorf("Failed to write tar content: %+v", err)
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}
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if err := tarWriter.Close(); err != nil {
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log.Debugf("Failed to close tar writer: %+v", err)
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}
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tarBytes := bytes.NewReader(buf.Bytes())
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if err := docker.CopyToContainer(ctx, nodeContainer.ID, "/", tarBytes, types.CopyToContainerOptions{AllowOverwriteDirWithFile: true}); err != nil {
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return fmt.Errorf("Failed to copy content to container '%s': %+v", nodeContainer.ID, err)
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}
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return nil
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}
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// ReadFromNode reads from a given filepath inside the node container
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func (d Docker) ReadFromNode(ctx context.Context, path string, node *k3d.Node) (io.ReadCloser, error) {
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log.Tracef("Reading path %s from node %s...", path, node.Name)
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nodeContainer, err := getNodeContainer(ctx, node)
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if err != nil {
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return nil, fmt.Errorf("Failed to find container for node '%s': %+v", node.Name, err)
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}
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docker, err := GetDockerClient()
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if err != nil {
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return nil, err
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}
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reader, _, err := docker.CopyFromContainer(ctx, nodeContainer.ID, path)
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if err != nil {
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if client.IsErrNotFound(err) {
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return nil, errors.Wrap(runtimeErrors.ErrRuntimeFileNotFound, err.Error())
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}
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return nil, err
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}
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return reader, err
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}
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// GetDockerClient returns a docker client
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func GetDockerClient() (*client.Client, error) {
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var err error
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var cli *client.Client
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dockerHost := os.Getenv("DOCKER_HOST")
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if strings.HasPrefix(dockerHost, "ssh://") {
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var helper *connhelper.ConnectionHelper
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helper, err = connhelper.GetConnectionHelper(dockerHost)
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if err != nil {
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return nil, err
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}
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cli, err = client.NewClientWithOpts(
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client.WithHost(helper.Host),
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client.WithDialContext(helper.Dialer),
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client.WithAPIVersionNegotiation(),
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)
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} else {
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cli, err = client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
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}
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return cli, err
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}
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// isAttachedToNetwork return true if node is attached to network
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func isAttachedToNetwork(node *k3d.Node, network string) bool {
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for _, nw := range node.Networks {
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if nw == network {
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return true
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}
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}
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return false
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}
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