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util.go
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util.go
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/*
Copyright 2019 The Kubernetes Authors.
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 nodeutils
import (
"bytes"
"encoding/json"
"fmt"
"io"
"path/filepath"
"strings"
"sigs.k8s.io/kind/pkg/cluster/nodes"
"sigs.k8s.io/kind/pkg/errors"
"sigs.k8s.io/kind/pkg/exec"
"sigs.k8s.io/kind/pkg/cluster/internal/providers/provider/common"
)
// GetControlPlaneEndpoint returns the control plane endpoints for IPv4 and IPv6
// in case the cluster has an external load balancer in front of the control-plane nodes,
// otherwise return the bootstrap node IPs
func GetControlPlaneEndpoint(allNodes []nodes.Node) (string, string, error) {
node, err := APIServerEndpointNode(allNodes)
if err != nil {
return "", "", err
}
// gets the control plane IP addresses
controlPlaneIPv4, controlPlaneIPv6, err := node.IP()
if err != nil {
return "", "", errors.Wrapf(err, "failed to get IPs for node: %s", node.String())
}
// TODO: place this in a central constant
// TODO: should probably use net.JoinHostPort
return fmt.Sprintf("%s:%d", controlPlaneIPv4, common.APIServerInternalPort), fmt.Sprintf("[%s]:%d", controlPlaneIPv6, common.APIServerInternalPort), nil
}
// KubeVersion returns the Kubernetes version installed on the node
func KubeVersion(n nodes.Node) (version string, err error) {
// grab kubernetes version from the node image
cmd := n.Command("cat", "/kind/version")
lines, err := exec.CombinedOutputLines(cmd)
if err != nil {
return "", errors.Wrap(err, "failed to get file")
}
if len(lines) != 1 {
return "", errors.Errorf("file should only be one line, got %d lines", len(lines))
}
return lines[0], nil
}
// WriteFile writes content to dest on the node
func WriteFile(n nodes.Node, dest, content string) error {
// create destination directory
err := n.Command("mkdir", "-p", filepath.Dir(dest)).Run()
if err != nil {
return errors.Wrapf(err, "failed to create directory %s", dest)
}
return n.Command("cp", "/dev/stdin", dest).SetStdin(strings.NewReader(content)).Run()
}
// CopyNodeToNode copies file from a to b
func CopyNodeToNode(a, b nodes.Node, file string) error {
// create destination directory
err := b.Command("mkdir", "-p", filepath.Dir(file)).Run()
if err != nil {
return errors.Wrapf(err, "failed to create directory %q", filepath.Dir(file))
}
// TODO: experiment with streaming instead to avoid the copy
// for now we only use this for small files so it's not worth the complexity
var buff bytes.Buffer
if err := a.Command("cat", file).SetStdout(&buff).Run(); err != nil {
return errors.Wrapf(err, "failed to read %q from node", file)
}
if err := b.Command("cp", "/dev/stdin", file).SetStdin(&buff).Run(); err != nil {
return errors.Wrapf(err, "failed to write %q to node", file)
}
return nil
}
// LoadImageArchive loads image onto the node, where image is a Reader over an image archive
func LoadImageArchive(n nodes.Node, image io.Reader) error {
cmd := n.Command("ctr", "--namespace=k8s.io", "images", "import", "-").SetStdin(image)
if err := cmd.Run(); err != nil {
return errors.Wrap(err, "failed to load image")
}
return nil
}
// ImageID returns ID of image on the node with the given image name if present
func ImageID(n nodes.Node, image string) (string, error) {
var out bytes.Buffer
if err := n.Command("crictl", "inspecti", image).SetStdout(&out).Run(); err != nil {
return "", err
}
// we only care about the image ID
crictlOut := struct {
Status struct {
ID string `json:"id"`
} `json:"status"`
}{}
if err := json.Unmarshal(out.Bytes(), &crictlOut); err != nil {
return "", err
}
return crictlOut.Status.ID, nil
}