122 lines
2.8 KiB
Go
122 lines
2.8 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 executor
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import (
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"crypto/sha256"
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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/util"
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"github.com/pkg/errors"
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)
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// NewCompositeCache returns an initialized composite cache object.
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func NewCompositeCache(initial ...string) *CompositeCache {
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c := CompositeCache{
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keys: initial,
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}
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return &c
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}
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// CompositeCache is a type that generates a cache key from a series of keys.
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type CompositeCache struct {
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keys []string
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}
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// AddKey adds the specified key to the sequence.
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func (s *CompositeCache) AddKey(k ...string) {
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s.keys = append(s.keys, k...)
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}
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// Key returns the human readable composite key as a string.
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func (s *CompositeCache) Key() string {
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return strings.Join(s.keys, "-")
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}
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// Hash returns the composite key in a string SHA256 format.
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func (s *CompositeCache) Hash() (string, error) {
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return util.SHA256(strings.NewReader(s.Key()))
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}
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func (s *CompositeCache) AddPath(p string, context util.FileContext) error {
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sha := sha256.New()
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fi, err := os.Lstat(p)
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if err != nil {
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return errors.Wrap(err, "could not add path")
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}
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if fi.Mode().IsDir() {
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empty, k, err := hashDir(p, context)
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if err != nil {
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return err
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}
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// Only add the hash of this directory to the key
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// if there is any ignored content.
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if !empty || !context.ExcludesFile(p) {
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s.keys = append(s.keys, k)
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}
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return nil
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}
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if context.ExcludesFile(p) {
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return nil
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}
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fh, err := util.CacheHasher()(p)
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if err != nil {
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return err
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}
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if _, err := sha.Write([]byte(fh)); err != nil {
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return err
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}
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s.keys = append(s.keys, fmt.Sprintf("%x", sha.Sum(nil)))
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return nil
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}
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// HashDir returns a hash of the directory.
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func hashDir(p string, context util.FileContext) (bool, string, error) {
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sha := sha256.New()
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empty := true
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if err := filepath.Walk(p, func(path string, fi os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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exclude := context.ExcludesFile(path)
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if exclude {
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return nil
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}
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fileHash, err := util.CacheHasher()(path)
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if err != nil {
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return err
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}
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if _, err := sha.Write([]byte(fileHash)); err != nil {
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return err
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}
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empty = false
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return nil
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}); err != nil {
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return false, "", err
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}
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return empty, fmt.Sprintf("%x", sha.Sum(nil)), nil
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}
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