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130 lines
3.5 KiB
130 lines
3.5 KiB
// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package lfs
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import (
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"io"
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"os"
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"path/filepath"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/util"
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)
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var (
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errHashMismatch = errors.New("Content hash does not match OID")
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errSizeMismatch = errors.New("Content size does not match")
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)
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// ContentStore provides a simple file system based storage.
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type ContentStore struct {
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BasePath string
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}
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// Get takes a Meta object and retrieves the content from the store, returning
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// it as an io.Reader. If fromByte > 0, the reader starts from that byte
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func (s *ContentStore) Get(meta *models.LFSMetaObject, fromByte int64) (io.ReadCloser, error) {
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path := filepath.Join(s.BasePath, transformKey(meta.Oid))
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f, err := os.Open(path)
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if err != nil {
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log.Error("Whilst trying to read LFS OID[%s]: Unable to open %s Error: %v", meta.Oid, path, err)
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return nil, err
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}
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if fromByte > 0 {
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_, err = f.Seek(fromByte, os.SEEK_CUR)
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if err != nil {
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log.Error("Whilst trying to read LFS OID[%s]: Unable to seek to %d Error: %v", meta.Oid, fromByte, err)
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}
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}
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return f, err
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}
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// Put takes a Meta object and an io.Reader and writes the content to the store.
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func (s *ContentStore) Put(meta *models.LFSMetaObject, r io.Reader) error {
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path := filepath.Join(s.BasePath, transformKey(meta.Oid))
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tmpPath := path + ".tmp"
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dir := filepath.Dir(path)
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if err := os.MkdirAll(dir, 0750); err != nil {
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log.Error("Whilst putting LFS OID[%s]: Unable to create the LFS directory: %s Error: %v", meta.Oid, dir, err)
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return err
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}
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file, err := os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_EXCL, 0640)
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if err != nil {
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log.Error("Whilst putting LFS OID[%s]: Unable to open temporary file for writing: %s Error: %v", tmpPath, err)
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return err
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}
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defer func() {
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if err := util.Remove(tmpPath); err != nil {
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log.Warn("Unable to remove temporary path: %s: Error: %v", tmpPath, err)
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}
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}()
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hash := sha256.New()
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hw := io.MultiWriter(hash, file)
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written, err := io.Copy(hw, r)
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if err != nil {
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log.Error("Whilst putting LFS OID[%s]: Failed to copy to tmpPath: %s Error: %v", meta.Oid, tmpPath, err)
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file.Close()
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return err
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}
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file.Close()
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if written != meta.Size {
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return errSizeMismatch
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}
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shaStr := hex.EncodeToString(hash.Sum(nil))
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if shaStr != meta.Oid {
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return errHashMismatch
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}
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if err := os.Rename(tmpPath, path); err != nil {
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log.Error("Whilst putting LFS OID[%s]: Unable to move tmp file to final destination: %s Error: %v", meta.Oid, path, err)
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return err
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}
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return nil
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}
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// Exists returns true if the object exists in the content store.
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func (s *ContentStore) Exists(meta *models.LFSMetaObject) bool {
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path := filepath.Join(s.BasePath, transformKey(meta.Oid))
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if _, err := os.Stat(path); 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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// Verify returns true if the object exists in the content store and size is correct.
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func (s *ContentStore) Verify(meta *models.LFSMetaObject) (bool, error) {
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path := filepath.Join(s.BasePath, transformKey(meta.Oid))
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fi, err := os.Stat(path)
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if os.IsNotExist(err) || err == nil && fi.Size() != meta.Size {
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return false, nil
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} else if err != nil {
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log.Error("Unable stat file: %s for LFS OID[%s] Error: %v", path, meta.Oid, err)
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return false, err
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}
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return true, nil
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}
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func transformKey(key string) string {
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if len(key) < 5 {
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return key
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}
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return filepath.Join(key[0:2], key[2:4], key[4:])
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}
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