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Make minio package support legacy MD5 checksum (#23768)

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A feedback from discord:
https://discord.com/channels/322538954119184384/561007778139734027/1090185427115319386

Some storages like:

 * https://developers.cloudflare.com/r2/api/s3/api/
 * https://www.backblaze.com/b2/docs/s3_compatible_api.html

They do not support "x-amz-checksum-algorithm" header

But minio recently uses that header with CRC32C by default. So we have
to tell minio to use legacy MD5 checksum.

I guess this needs to be backported because IIRC we 1.19 and 1.20 are
using similar minio package.


The minio package code for SendContentMD5 looks like this:

<details>

<img width="755" alt="image"
src="https://user-images.githubusercontent.com/2114189/228186768-4f2f6f67-62b9-4aee-9251-5af714ad9674.png">

</details>
This commit is contained in:
wxiaoguang
2023-03-28 23:10:24 +08:00
committed by GitHub
parent 6a0ef71984
commit 5727056ea1
7 changed files with 76 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
modules/lfs/content_store.go
View File

@@ -60,15 +60,22 @@ func (s *ContentStore) Put(pointer Pointer, r io.Reader) error {
return err
}
// This shouldn't happen but it is sensible to test
if written != pointer.Size {
if err := s.Delete(p); err != nil {
log.Error("Cleaning the LFS OID[%s] failed: %v", pointer.Oid, err)
}
return ErrSizeMismatch
// check again whether there is any error during the Save operation
// because some errors might be ignored by the Reader's caller
if wrappedRd.lastError != nil && !errors.Is(wrappedRd.lastError, io.EOF) {
err = wrappedRd.lastError
} else if written != pointer.Size {
err = ErrSizeMismatch
}
return nil
// if the upload failed, try to delete the file
if err != nil {
if errDel := s.Delete(p); errDel != nil {
log.Error("Cleaning the LFS OID[%s] failed: %v", pointer.Oid, errDel)
}
}
return err
}
// Exists returns true if the object exists in the content store.
@@ -109,6 +116,17 @@ type hashingReader struct {
expectedSize int64
hash hash.Hash
expectedHash string
lastError error
}
// recordError records the last error during the Save operation
// Some callers of the Reader doesn't respect the returned "err"
// For example, MinIO's Put will ignore errors if the written size could equal to expected size
// So we must remember the error by ourselves,
// and later check again whether ErrSizeMismatch or ErrHashMismatch occurs during the Save operation
func (r *hashingReader) recordError(err error) error {
r.lastError = err
return err
}
func (r *hashingReader) Read(b []byte) (int, error) {
@@ -118,22 +136,22 @@ func (r *hashingReader) Read(b []byte) (int, error) {
r.currentSize += int64(n)
wn, werr := r.hash.Write(b[:n])
if wn != n || werr != nil {
return n, werr
return n, r.recordError(werr)
}
}
if err != nil && err == io.EOF {
if errors.Is(err, io.EOF) || r.currentSize >= r.expectedSize {
if r.currentSize != r.expectedSize {
return n, ErrSizeMismatch
return n, r.recordError(ErrSizeMismatch)
}
shaStr := hex.EncodeToString(r.hash.Sum(nil))
if shaStr != r.expectedHash {
return n, ErrHashMismatch
return n, r.recordError(ErrHashMismatch)
}
}
return n, err
return n, r.recordError(err)
}
func newHashingReader(expectedSize int64, expectedHash string, reader io.Reader) *hashingReader {