|
| 1 | +// Copyright 2024 The go-ethereum Authors |
| 2 | +// This file is part of the go-ethereum library. |
| 3 | +// |
| 4 | +// The go-ethereum library is free software: you can redistribute it and/or modify |
| 5 | +// it under the terms of the GNU Lesser General Public License as published by |
| 6 | +// the Free Software Foundation, either version 3 of the License, or |
| 7 | +// (at your option) any later version. |
| 8 | +// |
| 9 | +// The go-ethereum library is distributed in the hope that it will be useful, |
| 10 | +// but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | +// GNU Lesser General Public License for more details. |
| 13 | +// |
| 14 | +// You should have received a copy of the GNU Lesser General Public License |
| 15 | +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. |
| 16 | + |
| 17 | +package build |
| 18 | + |
| 19 | +import ( |
| 20 | + "crypto/sha256" |
| 21 | + "io" |
| 22 | + "os" |
| 23 | + "path/filepath" |
| 24 | + "sort" |
| 25 | + "strings" |
| 26 | +) |
| 27 | + |
| 28 | +// FileExist checks if a file exists at path. |
| 29 | +func FileExist(path string) bool { |
| 30 | + _, err := os.Stat(path) |
| 31 | + if err != nil && os.IsNotExist(err) { |
| 32 | + return false |
| 33 | + } |
| 34 | + return true |
| 35 | +} |
| 36 | + |
| 37 | +// HashFiles iterates the provided set of files, computing the hash of each. |
| 38 | +func HashFiles(files []string) (map[string][32]byte, error) { |
| 39 | + res := make(map[string][32]byte) |
| 40 | + for _, filePath := range files { |
| 41 | + f, err := os.OpenFile(filePath, os.O_RDONLY, 0666) |
| 42 | + if err != nil { |
| 43 | + return nil, err |
| 44 | + } |
| 45 | + hasher := sha256.New() |
| 46 | + if _, err := io.Copy(hasher, f); err != nil { |
| 47 | + return nil, err |
| 48 | + } |
| 49 | + res[filePath] = [32]byte(hasher.Sum(nil)) |
| 50 | + } |
| 51 | + return res, nil |
| 52 | +} |
| 53 | + |
| 54 | +// HashFolder iterates all files under the given directory, computing the hash |
| 55 | +// of each. |
| 56 | +func HashFolder(folder string, exlude []string) (map[string][32]byte, error) { |
| 57 | + res := make(map[string][32]byte) |
| 58 | + err := filepath.WalkDir(folder, func(path string, d os.DirEntry, _ error) error { |
| 59 | + // Skip anything that's exluded or not a regular file |
| 60 | + for _, skip := range exlude { |
| 61 | + if strings.HasPrefix(path, filepath.FromSlash(skip)) { |
| 62 | + return filepath.SkipDir |
| 63 | + } |
| 64 | + } |
| 65 | + if !d.Type().IsRegular() { |
| 66 | + return nil |
| 67 | + } |
| 68 | + // Regular file found, hash it |
| 69 | + f, err := os.OpenFile(path, os.O_RDONLY, 0666) |
| 70 | + if err != nil { |
| 71 | + return err |
| 72 | + } |
| 73 | + hasher := sha256.New() |
| 74 | + if _, err := io.Copy(hasher, f); err != nil { |
| 75 | + return err |
| 76 | + } |
| 77 | + res[path] = [32]byte(hasher.Sum(nil)) |
| 78 | + return nil |
| 79 | + }) |
| 80 | + if err != nil { |
| 81 | + return nil, err |
| 82 | + } |
| 83 | + return res, nil |
| 84 | +} |
| 85 | + |
| 86 | +// DiffHashes compares two maps of file hashes and returns the changed files. |
| 87 | +func DiffHashes(a map[string][32]byte, b map[string][32]byte) []string { |
| 88 | + var updates []string |
| 89 | + |
| 90 | + for file := range a { |
| 91 | + if _, ok := b[file]; !ok || a[file] != b[file] { |
| 92 | + updates = append(updates, file) |
| 93 | + } |
| 94 | + } |
| 95 | + for file := range b { |
| 96 | + if _, ok := a[file]; !ok { |
| 97 | + updates = append(updates, file) |
| 98 | + } |
| 99 | + } |
| 100 | + sort.Strings(updates) |
| 101 | + return updates |
| 102 | +} |
0 commit comments