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preload.go
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preload.go
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package control
import (
"compress/gzip"
"context"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"regexp"
"strings"
"github.com/codegangsta/cli"
dockerClient "github.com/docker/engine-api/client"
"github.com/rancher/os/docker"
"github.com/rancher/os/log"
)
const (
userImagesPreloadDirectory = "/var/lib/rancher/preload/docker"
)
func preloadImagesAction(c *cli.Context) error {
return PreloadImages(docker.NewDefaultClient, userImagesPreloadDirectory)
}
func shouldLoad(file string) bool {
if strings.HasSuffix(file, ".done") {
return false
}
if _, err := os.Stat(fmt.Sprintf("%s.done", file)); err == nil {
return false
}
return true
}
func PreloadImages(clientFactory func() (dockerClient.APIClient, error), imagesDir string) error {
var client dockerClient.APIClient
clientInitialized := false
if _, err := os.Stat(imagesDir); os.IsNotExist(err) {
if err = os.MkdirAll(imagesDir, 0755); err != nil {
return err
}
} else if err != nil {
return err
}
files, err := ioutil.ReadDir(imagesDir)
if err != nil {
return err
}
for _, file := range files {
filename := path.Join(imagesDir, file.Name())
if !shouldLoad(filename) {
continue
}
image, err := os.Open(filename)
if err != nil {
return err
}
var imageReader io.Reader
imageReader = image
match, err := regexp.MatchString(".t?gz$", file.Name())
if err != nil {
return err
}
if match {
imageReader, err = gzip.NewReader(image)
if err != nil {
return err
}
}
if !clientInitialized {
client, err = clientFactory()
if err != nil {
return err
}
clientInitialized = true
}
log.Infof("Loading image %s", filename)
if _, err = client.ImageLoad(context.Background(), imageReader, false); err != nil {
return err
}
if err = image.Close(); err != nil {
return err
}
doneStamp, err := os.Create(fmt.Sprintf("%s.done", filename))
if err != nil {
return err
}
if err = doneStamp.Close(); err != nil {
return err
}
}
return nil
}