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// Copyright The gittuf Authors
// SPDX-License-Identifier: Apache-2.0
package gitinterface
import (
"bytes"
"fmt"
"io"
)
// ReadBlob returns the contents of the blob referenced by blobID.
func (r *Repository) ReadBlob(blobID Hash) ([]byte, error) {
objType, err := r.executor("cat-file", "-t", blobID.String()).executeString()
if err != nil {
return nil, fmt.Errorf("unable to inspect if object is blob: %w", err)
} else if objType != "blob" {
return nil, fmt.Errorf("requested Git ID '%s' is not a blob object", blobID.String())
}
stdOut, stdErr, err := r.executor("cat-file", "-p", blobID.String()).execute()
if err != nil {
return nil, fmt.Errorf("unable to read blob: %s", stdErr)
}
return io.ReadAll(stdOut)
}
// WriteBlob creates a blob object with the specified contents and returns the
// ID of the resultant blob.
func (r *Repository) WriteBlob(contents []byte) (Hash, error) {
stdInBuf := bytes.NewBuffer(contents)
objID, err := r.executor("hash-object", "-t", "blob", "-w", "--stdin").withStdIn(stdInBuf).executeString()
if err != nil {
return ZeroHash, fmt.Errorf("unable to write blob: %w", err)
}
hash, err := NewHash(objID)
if err != nil {
return ZeroHash, fmt.Errorf("invalid Git ID for blob: %w", err)
}
return hash, nil
}
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