125 lines
3.5 KiB
Go
125 lines
3.5 KiB
Go
/*
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Copyright 2018 Google LLC
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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 cache
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import (
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"fmt"
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"os"
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"path"
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"time"
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"github.com/GoogleContainerTools/kaniko/pkg/config"
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"github.com/GoogleContainerTools/kaniko/pkg/creds"
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"github.com/google/go-containerregistry/pkg/name"
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"github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/remote"
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"github.com/google/go-containerregistry/pkg/v1/tarball"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// LayerCache is the layer cache
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type LayerCache interface {
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RetrieveLayer(string) (v1.Image, error)
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}
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// RegistryCache is the registry cache
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type RegistryCache struct {
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Opts *config.KanikoOptions
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}
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// RetrieveLayer retrieves a layer from the cache given the cache key ck.
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func (rc *RegistryCache) RetrieveLayer(ck string) (v1.Image, error) {
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cache, err := Destination(rc.Opts, ck)
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if err != nil {
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return nil, errors.Wrap(err, "getting cache destination")
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}
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logrus.Infof("Checking for cached layer %s...", cache)
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cacheRef, err := name.NewTag(cache, name.WeakValidation)
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if err != nil {
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return nil, errors.Wrap(err, fmt.Sprintf("getting reference for %s", cache))
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}
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img, err := remote.Image(cacheRef, remote.WithAuthFromKeychain(creds.GetKeychain()))
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if err != nil {
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return nil, err
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}
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cf, err := img.ConfigFile()
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if err != nil {
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return nil, errors.Wrap(err, fmt.Sprintf("retrieving config file for %s", cache))
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}
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expiry := cf.Created.Add(rc.Opts.CacheTTL)
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// Layer is stale, rebuild it.
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if expiry.Before(time.Now()) {
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logrus.Infof("Cache entry expired: %s", cache)
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return nil, errors.New(fmt.Sprintf("Cache entry expired: %s", cache))
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}
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// Force the manifest to be populated
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if _, err := img.RawManifest(); err != nil {
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return nil, err
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}
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return img, nil
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}
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// Destination returns the repo where the layer should be stored
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// If no cache is specified, one is inferred from the destination provided
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func Destination(opts *config.KanikoOptions, cacheKey string) (string, error) {
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cache := opts.CacheRepo
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if cache == "" {
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destination := opts.Destinations[0]
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destRef, err := name.NewTag(destination, name.WeakValidation)
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if err != nil {
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return "", errors.Wrap(err, "getting tag for destination")
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}
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return fmt.Sprintf("%s/cache:%s", destRef.Context(), cacheKey), nil
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}
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return fmt.Sprintf("%s:%s", cache, cacheKey), nil
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}
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// LocalSource retieves a source image from a local cache given cacheKey
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func LocalSource(opts *config.KanikoOptions, cacheKey string) (v1.Image, error) {
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cache := opts.CacheDir
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if cache == "" {
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return nil, nil
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}
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path := path.Join(cache, cacheKey)
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fi, err := os.Stat(path)
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if err != nil {
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return nil, errors.Wrap(err, "geting file info")
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}
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// A stale cache is a bad cache
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expiry := fi.ModTime().Add(opts.CacheTTL)
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if expiry.Before(time.Now()) {
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logrus.Debugf("Cached image is too old: %v", fi.ModTime())
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return nil, nil
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}
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imgTar, err := tarball.ImageFromPath(path, nil)
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if err != nil {
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return nil, errors.Wrap(err, "getting image from path")
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}
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logrus.Infof("Found %s in local cache", cacheKey)
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return imgTar, nil
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}
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