132 lines
3.7 KiB
Go
132 lines
3.7 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"net/url"
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"os"
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"path/filepath"
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"time"
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"github.com/golang/glog"
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"github.com/hashicorp/go-getter"
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"github.com/juju/mutex"
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"github.com/pkg/errors"
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"k8s.io/minikube/pkg/minikube/constants"
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"k8s.io/minikube/pkg/minikube/localpath"
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"k8s.io/minikube/pkg/minikube/out"
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"k8s.io/minikube/pkg/util/lock"
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)
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const fileScheme = "file"
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// ISODownloader downloads an ISO
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type ISODownloader interface {
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GetISOFileURI(isoURL string) string
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CacheMinikubeISOFromURL(isoURL string) error
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}
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// DefaultDownloader is the default ISODownloader
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type DefaultDownloader struct{}
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// GetISOFileURI gets the local destination for a remote source
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func (f DefaultDownloader) GetISOFileURI(isoURL string) string {
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urlObj, err := url.Parse(isoURL)
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if err != nil {
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return isoURL
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}
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if urlObj.Scheme == fileScheme {
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return isoURL
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}
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isoPath := filepath.Join(localpath.MiniPath(), "cache", "iso", filepath.Base(isoURL))
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// As this is a file URL there should be no backslashes regardless of platform running on.
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return "file://" + filepath.ToSlash(isoPath)
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}
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// CacheMinikubeISOFromURL downloads the ISO, if it doesn't exist in cache
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func (f DefaultDownloader) CacheMinikubeISOFromURL(url string) error {
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dst := f.GetISOCacheFilepath(url)
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// Lock before we check for existence to avoid thundering herd issues
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spec := lock.PathMutexSpec(dst)
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spec.Timeout = 10 * time.Minute
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glog.Infof("acquiring lock: %+v", spec)
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releaser, err := mutex.Acquire(spec)
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if err != nil {
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return errors.Wrapf(err, "unable to acquire lock for %+v", spec)
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}
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defer releaser.Release()
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if !f.ShouldCacheMinikubeISO(url) {
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glog.Infof("Not caching ISO, using %s", url)
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return nil
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}
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urlWithChecksum := url
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if url == constants.DefaultISOURL {
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urlWithChecksum = url + "?checksum=file:" + constants.DefaultISOSHAURL
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}
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// Predictable temp destination so that resume can function
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tmpDst := dst + ".download"
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opts := []getter.ClientOption{getter.WithProgress(DefaultProgressBar)}
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client := &getter.Client{
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Src: urlWithChecksum,
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Dst: tmpDst,
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Mode: getter.ClientModeFile,
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Options: opts,
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}
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glog.Infof("full url: %s", urlWithChecksum)
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out.T(out.ISODownload, "Downloading VM boot image ...")
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if err := client.Get(); err != nil {
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return errors.Wrap(err, url)
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}
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return os.Rename(tmpDst, dst)
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}
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// ShouldCacheMinikubeISO returns if we need to download the ISO
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func (f DefaultDownloader) ShouldCacheMinikubeISO(isoURL string) bool {
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// store the minikube-iso inside the .minikube dir
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urlObj, err := url.Parse(isoURL)
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if err != nil {
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return false
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}
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if urlObj.Scheme == fileScheme {
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return false
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}
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if f.IsMinikubeISOCached(isoURL) {
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return false
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}
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return true
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}
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// GetISOCacheFilepath returns the path of an ISO in the local cache
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func (f DefaultDownloader) GetISOCacheFilepath(isoURL string) string {
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return filepath.Join(localpath.MiniPath(), "cache", "iso", filepath.Base(isoURL))
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}
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// IsMinikubeISOCached returns if an ISO exists in the local cache
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func (f DefaultDownloader) IsMinikubeISOCached(isoURL string) bool {
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if _, err := os.Stat(f.GetISOCacheFilepath(isoURL)); os.IsNotExist(err) {
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return false
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}
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return true
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}
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