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102 lines
2.7 KiB
102 lines
2.7 KiB
// Copyright 2024 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package build
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import (
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"crypto/sha256"
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"io"
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"os"
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"path/filepath"
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"sort"
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"strings"
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)
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// FileExist checks if a file exists at path.
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func FileExist(path string) bool {
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_, err := os.Stat(path)
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if err != nil && 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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// HashFiles iterates the provided set of files, computing the hash of each.
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func HashFiles(files []string) (map[string][32]byte, error) {
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res := make(map[string][32]byte)
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for _, filePath := range files {
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f, err := os.OpenFile(filePath, os.O_RDONLY, 0666)
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if err != nil {
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return nil, err
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}
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hasher := sha256.New()
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if _, err := io.Copy(hasher, f); err != nil {
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return nil, err
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}
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res[filePath] = [32]byte(hasher.Sum(nil))
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}
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return res, nil
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}
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// HashFolder iterates all files under the given directory, computing the hash
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// of each.
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func HashFolder(folder string, exlude []string) (map[string][32]byte, error) {
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res := make(map[string][32]byte)
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err := filepath.WalkDir(folder, func(path string, d os.DirEntry, _ error) error {
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// Skip anything that's exluded or not a regular file
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for _, skip := range exlude {
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if strings.HasPrefix(path, filepath.FromSlash(skip)) {
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return filepath.SkipDir
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}
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}
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if !d.Type().IsRegular() {
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return nil
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}
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// Regular file found, hash it
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f, err := os.OpenFile(path, os.O_RDONLY, 0666)
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if err != nil {
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return err
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}
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hasher := sha256.New()
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if _, err := io.Copy(hasher, f); err != nil {
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return err
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}
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res[path] = [32]byte(hasher.Sum(nil))
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return nil
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})
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if err != nil {
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return nil, err
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}
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return res, nil
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}
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// DiffHashes compares two maps of file hashes and returns the changed files.
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func DiffHashes(a map[string][32]byte, b map[string][32]byte) []string {
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var updates []string
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for file := range a {
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if _, ok := b[file]; !ok || a[file] != b[file] {
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updates = append(updates, file)
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}
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}
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for file := range b {
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if _, ok := a[file]; !ok {
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updates = append(updates, file)
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}
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}
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sort.Strings(updates)
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return updates
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}
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