DockerCLI/internal/versions/versions.go

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package versions
import (
"context"
"encoding/json"
"io/ioutil"
"os"
"path"
"path/filepath"
"sort"
registryclient "github.com/docker/cli/cli/registry/client"
clitypes "github.com/docker/cli/types"
"github.com/docker/distribution/reference"
ver "github.com/hashicorp/go-version"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// defaultRuntimeMetadataDir is the location where the metadata file is stored
defaultRuntimeMetadataDir = "/var/lib/docker-engine"
)
// GetEngineVersions reports the versions of the engine that are available
func GetEngineVersions(ctx context.Context, registryClient registryclient.RegistryClient, registryPrefix, imageName, versionString string) (clitypes.AvailableVersions, error) {
if imageName == "" {
var err error
localMetadata, err := GetCurrentRuntimeMetadata("")
if err != nil {
return clitypes.AvailableVersions{}, err
}
imageName = localMetadata.EngineImage
}
imageRef, err := reference.ParseNormalizedNamed(path.Join(registryPrefix, imageName))
if err != nil {
return clitypes.AvailableVersions{}, err
}
tags, err := registryClient.GetTags(ctx, imageRef)
if err != nil {
return clitypes.AvailableVersions{}, err
}
return parseTags(tags, versionString)
}
func parseTags(tags []string, currentVersion string) (clitypes.AvailableVersions, error) {
var ret clitypes.AvailableVersions
currentVer, err := ver.NewVersion(currentVersion)
if err != nil {
return ret, errors.Wrapf(err, "failed to parse existing version %s", currentVersion)
}
downgrades := []clitypes.DockerVersion{}
patches := []clitypes.DockerVersion{}
upgrades := []clitypes.DockerVersion{}
currentSegments := currentVer.Segments()
for _, tag := range tags {
tmp, err := ver.NewVersion(tag)
if err != nil {
logrus.Debugf("Unable to parse %s: %s", tag, err)
continue
}
testVersion := clitypes.DockerVersion{Version: *tmp, Tag: tag}
if testVersion.LessThan(currentVer) {
downgrades = append(downgrades, testVersion)
continue
}
testSegments := testVersion.Segments()
// lib always provides min 3 segments
if testSegments[0] == currentSegments[0] &&
testSegments[1] == currentSegments[1] {
patches = append(patches, testVersion)
} else {
upgrades = append(upgrades, testVersion)
}
}
sort.Slice(downgrades, func(i, j int) bool {
return downgrades[i].Version.LessThan(&downgrades[j].Version)
})
sort.Slice(patches, func(i, j int) bool {
return patches[i].Version.LessThan(&patches[j].Version)
})
sort.Slice(upgrades, func(i, j int) bool {
return upgrades[i].Version.LessThan(&upgrades[j].Version)
})
ret.Downgrades = downgrades
ret.Patches = patches
ret.Upgrades = upgrades
return ret, nil
}
// GetCurrentRuntimeMetadata loads the current daemon runtime metadata information from the local host
func GetCurrentRuntimeMetadata(metadataDir string) (*clitypes.RuntimeMetadata, error) {
if metadataDir == "" {
metadataDir = defaultRuntimeMetadataDir
}
filename := filepath.Join(metadataDir, clitypes.RuntimeMetadataName+".json")
data, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
var res clitypes.RuntimeMetadata
err = json.Unmarshal(data, &res)
if err != nil {
return nil, errors.Wrapf(err, "malformed runtime metadata file %s", filename)
}
return &res, nil
}
// WriteRuntimeMetadata stores the metadata on the local system
func WriteRuntimeMetadata(metadataDir string, metadata *clitypes.RuntimeMetadata) error {
if metadataDir == "" {
metadataDir = defaultRuntimeMetadataDir
}
filename := filepath.Join(metadataDir, clitypes.RuntimeMetadataName+".json")
data, err := json.Marshal(metadata)
if err != nil {
return err
}
os.Remove(filename)
return ioutil.WriteFile(filename, data, 0644)
}