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imagescollector.go
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/
imagescollector.go
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/*
* Copyright IBM Corporation 2021
*
* 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 collector
import (
"encoding/json"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
sourcetypes "github.com/konveyor/move2kube/collector/sourcetypes"
"github.com/konveyor/move2kube/common"
collecttypes "github.com/konveyor/move2kube/types/collection"
"github.com/sirupsen/logrus"
"github.com/spf13/cast"
)
//ImagesCollector collects the docker images
type ImagesCollector struct {
}
// GetAnnotations returns annotations on which this collector should be invoked
func (c ImagesCollector) GetAnnotations() []string {
annotations := []string{"k8s", "dockerswarm", "dockercompose"}
return annotations
}
//Collect gets the image metadata using docker inspect
func (c *ImagesCollector) Collect(inputDirectory string, outputPath string) error {
//Creating the output sub-directory if it does not exist
outputPath = filepath.Join(outputPath, "images")
err := os.MkdirAll(outputPath, common.DefaultDirectoryPermission)
if err != nil {
logrus.Errorf("Unable to create output directory %s : %s", outputPath, err)
return err
}
imageNames, err := getImageNames(inputDirectory)
if err != nil {
return err
}
logrus.Debugf("Images : %s", imageNames)
for _, imageName := range imageNames {
imagedata, err := getDockerInspectResult(imageName)
if err != nil {
continue
}
if imagedata != nil {
imageInfo := getImageInfo(imagedata)
shortesttag := ""
for _, tag := range imageInfo.Spec.Tags {
if shortesttag == "" {
shortesttag = tag
} else {
if len(shortesttag) > len(tag) {
shortesttag = tag
}
}
}
imagefile := filepath.Join(outputPath, common.NormalizeForFilename(shortesttag)+".yaml")
err := common.WriteYaml(imagefile, imageInfo)
logrus.Errorf("Unable to write file %s : %s", imagefile, err)
}
}
return nil
}
func getDockerInspectResult(imageName string) ([]byte, error) {
cmd := exec.Command("docker", "inspect", imageName)
jsonOutput, err := cmd.CombinedOutput()
if err != nil {
if strings.Contains(string(jsonOutput), "permission denied") {
logrus.Warnf("Error while running docker-inspect due to lack of permissions")
logrus.Warnf("Please refer to [https://docs.docker.com/engine/install/linux-postinstall/] to fix this issue")
} else if strings.Contains(string(jsonOutput), "No such object") {
logrus.Warnf("Image [%s] not available in local image repo. Run \"docker pull %s\"", imageName, imageName)
return nil, nil
} else {
logrus.Warnf("Error while running docker-inspect: %s", err)
}
return nil, err
}
return jsonOutput, nil
}
func getImageInfo(data []byte) collecttypes.ImageInfo {
imageInfo := collecttypes.NewImageInfo()
imgLayerInfo := []sourcetypes.DockerImage{}
err := json.Unmarshal(data, &imgLayerInfo)
if err != nil {
logrus.Errorf("Unable to unmarshal image info : %s", err)
}
for _, image := range imgLayerInfo {
imageInfo.Spec.Tags = image.RepoTags
imageInfo.Spec.UserID, err = cast.ToIntE(image.CConfig.User)
if err != nil {
logrus.Debugf("UserID not available in image metadata for [%s]", image.RepoTags[0])
imageInfo.Spec.UserID = -1
}
imageInfo.Spec.AccessedDirs = append(imageInfo.Spec.AccessedDirs, image.CConfig.WorkingDir)
for key := range image.CConfig.EPorts {
regex := regexp.MustCompile("[0-9]+")
portNumber, err := cast.ToInt32E(string(regex.FindAll([]byte(key), -1)[0]))
if err != nil {
logrus.Debugf("PortNumber not available in image metadata for [%s]", image.RepoTags[0])
} else {
imageInfo.Spec.PortsToExpose = append(imageInfo.Spec.PortsToExpose, portNumber)
}
}
}
return imageInfo
}
func getImageNames(inputPath string) ([]string, error) {
if inputPath == "" {
return getAllImageNames()
}
return getDCImageNames(inputPath)
}
func getAllImageNames() ([]string, error) {
cmd := exec.Command("bash", "-c", "docker image list --format '{{.Repository}}:{{.Tag}}'")
outputStr, err := cmd.Output()
if err != nil {
logrus.Warnf("Error while running docker image list : %s", err)
return nil, err
}
images := strings.Split(string(outputStr), "\n")
cleanimages := []string{}
for _, image := range images {
if strings.HasPrefix(image, "<none>") || strings.HasSuffix(image, "<none>") {
logrus.Debugf("Ignore image with <none> : %s", image)
continue
}
}
return cleanimages, err
}
func getDCImageNames(directorypath string) ([]string, error) {
var imageNames []string
files, err := common.GetFilesByExt(directorypath, []string{".yml", ".yaml"})
if err != nil {
logrus.Warnf("Unable to fetch yaml files and recognize Docker image yamls : %s", err)
}
for _, path := range files {
dc := sourcetypes.DockerCompose{}
if common.ReadYaml(path, &dc) == nil {
for _, dcservice := range dc.DCServices {
imageNames = append(imageNames, dcservice.Image)
}
}
}
return imageNames, nil
}