forked from Cloud-Foundations/Dominator
/
addReplaceImage.go
143 lines (135 loc) · 4.08 KB
/
addReplaceImage.go
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package main
import (
"errors"
"fmt"
"os"
"strconv"
"strings"
"github.com/Cloud-Foundations/Dominator/imageserver/client"
"github.com/Cloud-Foundations/Dominator/lib/filesystem"
"github.com/Cloud-Foundations/Dominator/lib/log"
objectclient "github.com/Cloud-Foundations/Dominator/lib/objectserver/client"
"github.com/Cloud-Foundations/Dominator/lib/srpc"
)
func addReplaceImageSubcommand(args []string, logger log.DebugLogger) error {
imageSClient, objectClient := getClients()
err := addReplaceImage(imageSClient, objectClient, args[0], args[1],
args[2:], logger)
if err != nil {
return fmt.Errorf("error adding image: \"%s\": %s", args[0], err)
}
return nil
}
func bulkAddReplaceImagesSubcommand(args []string,
logger log.DebugLogger) error {
imageSClient, objectClient := getClients()
err := bulkAddReplaceImages(imageSClient, objectClient, args, logger)
if err != nil {
return fmt.Errorf("error adding image: \"%s\": %s", args[0], err)
}
return nil
}
func addReplaceImage(imageSClient *srpc.Client,
objectClient *objectclient.ObjectClient,
name, baseImageName string, layerImageNames []string,
logger log.DebugLogger) error {
imageExists, err := client.CheckImage(imageSClient, name)
if err != nil {
return errors.New("error checking for image existence: " + err.Error())
}
if imageExists {
return errors.New("image exists")
}
newImage, err := getImage(imageSClient, baseImageName)
if err != nil {
return err
}
if !newImage.ExpiresAt.IsZero() {
fmt.Fprintf(os.Stderr, "Skipping expiring image: %s\n", baseImageName)
return nil
}
for _, layerImageName := range layerImageNames {
fs, err := buildImage(imageSClient, newImage.Filter, layerImageName,
logger)
if err != nil {
return err
}
if err := layerImages(newImage.FileSystem, fs); err != nil {
return err
}
}
if err := spliceComputedFiles(newImage.FileSystem); err != nil {
return err
}
return addImage(imageSClient, name, newImage, logger)
}
func bulkAddReplaceImages(imageSClient *srpc.Client,
objectClient *objectclient.ObjectClient, layerImageNames []string,
logger log.DebugLogger) error {
imageNames, err := client.ListImages(imageSClient)
if err != nil {
return err
}
err = bulkAddReplaceImagesSep(imageSClient, objectClient, layerImageNames,
imageNames, "/", logger)
if err != nil {
return err
}
return bulkAddReplaceImagesSep(imageSClient, objectClient, layerImageNames,
imageNames, ".", logger)
}
func bulkAddReplaceImagesSep(imageSClient *srpc.Client,
objectClient *objectclient.ObjectClient, layerImageNames []string,
imageNames []string, separator string, logger log.DebugLogger) error {
baseNames := make(map[string]uint64)
for _, name := range imageNames {
fields := strings.Split(name, separator)
nFields := len(fields)
if nFields < 2 {
continue
}
lastField := fields[nFields-1]
if version, err := strconv.ParseUint(lastField, 10, 64); err != nil {
continue
} else {
name := strings.Join(fields[:nFields-1], separator)
if oldVersion := baseNames[name]; version >= oldVersion {
baseNames[name] = version
}
}
}
for baseName, version := range baseNames {
oldName := fmt.Sprintf("%s%s%d", baseName, separator, version)
newName := fmt.Sprintf("%s%s%d", baseName, separator, version+1)
err := addReplaceImage(imageSClient, objectClient, newName, oldName,
layerImageNames, logger)
if err != nil {
return err
}
}
return nil
}
func layerImages(baseFS *filesystem.FileSystem,
layerFS *filesystem.FileSystem) error {
for filename, layerInum := range layerFS.FilenameToInodeTable() {
layerInode := layerFS.InodeTable[layerInum]
if _, ok := layerInode.(*filesystem.DirectoryInode); ok {
continue
}
baseInum, ok := baseFS.FilenameToInodeTable()[filename]
if !ok {
return errors.New(filename + " missing in base image")
}
baseInode := baseFS.InodeTable[baseInum]
sameType, sameMetadata, sameData := filesystem.CompareInodes(baseInode,
layerInode, nil)
if !sameType {
return errors.New(filename + " changed type")
}
if sameMetadata && sameData {
continue
}
baseFS.InodeTable[baseInum] = layerInode
}
return nil
}