135 lines
3.3 KiB
Go
135 lines
3.3 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 snapshot
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/GoogleContainerTools/kaniko/pkg/timing"
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"github.com/GoogleContainerTools/kaniko/pkg/util"
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"github.com/sirupsen/logrus"
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)
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type LayeredMap struct {
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layers []map[string]string
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whiteouts []map[string]string
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hasher func(string) (string, error)
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// cacheHasher doesn't include mtime in it's hash so that filesystem cache keys are stable
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cacheHasher func(string) (string, error)
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}
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func NewLayeredMap(h func(string) (string, error), c func(string) (string, error)) *LayeredMap {
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l := LayeredMap{
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hasher: h,
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cacheHasher: c,
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}
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l.layers = []map[string]string{}
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return &l
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}
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func (l *LayeredMap) Snapshot() {
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l.whiteouts = append(l.whiteouts, map[string]string{})
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l.layers = append(l.layers, map[string]string{})
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}
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// Key returns a hash for added files
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func (l *LayeredMap) Key() (string, error) {
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c := bytes.NewBuffer([]byte{})
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enc := json.NewEncoder(c)
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enc.Encode(l.layers)
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return util.SHA256(c)
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}
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// GetFlattenedPathsForWhiteOut returns all paths in the current FS
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func (l *LayeredMap) getFlattenedPathsForWhiteOut() map[string]struct{} {
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paths := map[string]struct{}{}
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for _, l := range l.layers {
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for p := range l {
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if strings.HasPrefix(filepath.Base(p), ".wh.") {
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delete(paths, p)
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}
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paths[p] = struct{}{}
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}
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}
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return paths
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}
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func (l *LayeredMap) Get(s string) (string, bool) {
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for i := len(l.layers) - 1; i >= 0; i-- {
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if v, ok := l.layers[i][s]; ok {
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return v, ok
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}
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}
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return "", false
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}
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func (l *LayeredMap) GetWhiteout(s string) (string, bool) {
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for i := len(l.whiteouts) - 1; i >= 0; i-- {
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if v, ok := l.whiteouts[i][s]; ok {
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return v, ok
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}
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}
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return "", false
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}
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func (l *LayeredMap) MaybeAddWhiteout(s string) bool {
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whiteout, ok := l.GetWhiteout(s)
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if ok && whiteout == s {
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return false
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}
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l.whiteouts[len(l.whiteouts)-1][s] = s
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return true
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}
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// Add will add the specified file s to the layered map.
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func (l *LayeredMap) Add(s string) error {
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// Use hash function and add to layers
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newV, err := l.hasher(s)
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if err != nil {
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return fmt.Errorf("error creating hash for %s: %v", s, err)
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}
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l.layers[len(l.layers)-1][s] = newV
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return nil
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}
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// CheckFileChange checks whether a given file changed
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// from the current layered map by its hashing function.
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// Returns true if the file is changed.
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func (l *LayeredMap) CheckFileChange(s string) (bool, error) {
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t := timing.Start("Hashing files")
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defer timing.DefaultRun.Stop(t)
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newV, err := l.hasher(s)
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if err != nil {
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// if this file does not exist in the new layer return.
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if os.IsNotExist(err) {
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logrus.Tracef("%s detected as changed but does not exist", s)
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return false, nil
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}
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return false, err
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}
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oldV, ok := l.Get(s)
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if ok && newV == oldV {
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return false, nil
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}
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return true, nil
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}
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