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package storage
import (
"encoding/json"
"errors"
"os"
"path/filepath"
"github.com/google/uuid"
"gitlab.com/gitlab-org/gitaly/v15/internal/safe"
)
const (
// metadataFilename is the filename for a file we write on the gitaly server containing metadata about
// the filesystem
metadataFilename = ".gitaly-metadata"
)
// Metadata contains metadata about the filesystem
type Metadata struct {
GitalyFilesystemID string `json:"gitaly_filesystem_id"`
}
// WriteMetadataFile marshals and writes a metadata file
func WriteMetadataFile(storagePath string) (returnedErr error) {
path := filepath.Join(storagePath, metadataFilename)
if _, err := os.Stat(path); !os.IsNotExist(err) {
return err
}
fw, err := safe.NewFileWriter(path)
if err != nil {
return err
}
defer func() {
if err := fw.Close(); err != nil && returnedErr == nil {
if !errors.Is(err, safe.ErrAlreadyDone) {
returnedErr = err
}
}
}()
if err = json.NewEncoder(fw).Encode(&Metadata{
GitalyFilesystemID: uuid.New().String(),
}); err != nil {
return err
}
return fw.Commit()
}
// ReadMetadataFile reads and decodes the json metadata file
func ReadMetadataFile(storagePath string) (Metadata, error) {
path := filepath.Join(storagePath, metadataFilename)
var metadata Metadata
metadataFile, err := os.Open(path)
if err != nil {
return metadata, err
}
defer metadataFile.Close()
if err = json.NewDecoder(metadataFile).Decode(&metadata); err != nil {
return metadata, err
}
return metadata, nil
}
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