64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
// Linsk - A utility to access Linux-native file systems on non-Linux operating systems.
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// Copyright (c) 2023 The Linsk Authors.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// This program 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package storage
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import (
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"bytes"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"github.com/pkg/errors"
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)
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func validateFileHash(path string, hash []byte) error {
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pathClean := filepath.Clean(path)
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f, err := os.OpenFile(pathClean, os.O_RDONLY, 0400)
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if err != nil {
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return errors.Wrap(err, "open file")
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}
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defer func() { _ = f.Close() }()
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h := sha256.New()
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block := make([]byte, 1024)
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for {
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read, err := f.Read(block)
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if read > 0 {
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h.Write(block[:read])
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}
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if err != nil {
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if errors.Is(err, io.EOF) {
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break
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}
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return errors.Wrap(err, "read file block")
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}
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}
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sum := h.Sum(nil)
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if !bytes.Equal(sum, hash) {
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return fmt.Errorf("hash mismatch: want '%v', have '%v' (path '%v')", hex.EncodeToString(hash), hex.EncodeToString(sum), pathClean)
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}
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return nil
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}
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