forked from notaryproject/notary
/
filestore.go
102 lines (88 loc) · 2.59 KB
/
filestore.go
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package store
import (
"fmt"
"github.com/docker/notary"
"io/ioutil"
"os"
"path"
"path/filepath"
)
// NewFilesystemStore creates a new store in a directory tree
func NewFilesystemStore(baseDir, metaSubDir, metaExtension string) (*FilesystemStore, error) {
metaDir := path.Join(baseDir, metaSubDir)
// Make sure we can create the necessary dirs and they are writable
err := os.MkdirAll(metaDir, 0700)
if err != nil {
return nil, err
}
return &FilesystemStore{
baseDir: baseDir,
metaDir: metaDir,
metaExtension: metaExtension,
}, nil
}
// FilesystemStore is a store in a locally accessible directory
type FilesystemStore struct {
baseDir string
metaDir string
metaExtension string
}
func (f *FilesystemStore) getPath(name string) string {
fileName := fmt.Sprintf("%s.%s", name, f.metaExtension)
return filepath.Join(f.metaDir, fileName)
}
// GetMeta returns the meta for the given name (a role) up to size bytes
// If size is "NoSizeLimit", this corresponds to "infinite," but we cut off at a
// predefined threshold "notary.MaxDownloadSize".
func (f *FilesystemStore) GetMeta(name string, size int64) ([]byte, error) {
meta, err := ioutil.ReadFile(f.getPath(name))
if err != nil {
if os.IsNotExist(err) {
err = ErrMetaNotFound{Resource: name}
}
return nil, err
}
if size == NoSizeLimit {
size = notary.MaxDownloadSize
}
// Only return up to size bytes
if int64(len(meta)) < size {
return meta, nil
}
return meta[:size], nil
}
// SetMultiMeta sets the metadata for multiple roles in one operation
func (f *FilesystemStore) SetMultiMeta(metas map[string][]byte) error {
for role, blob := range metas {
err := f.SetMeta(role, blob)
if err != nil {
return err
}
}
return nil
}
// SetMeta sets the meta for a single role
func (f *FilesystemStore) SetMeta(name string, meta []byte) error {
fp := f.getPath(name)
// Ensures the parent directories of the file we are about to write exist
err := os.MkdirAll(filepath.Dir(fp), 0700)
if err != nil {
return err
}
// if something already exists, just delete it and re-write it
os.RemoveAll(fp)
// Write the file to disk
if err = ioutil.WriteFile(fp, meta, 0600); err != nil {
return err
}
return nil
}
// RemoveAll clears the existing filestore by removing its base directory
func (f *FilesystemStore) RemoveAll() error {
return os.RemoveAll(f.baseDir)
}
// RemoveMeta removes the metadata for a single role - if the metadata doesn't
// exist, no error is returned
func (f *FilesystemStore) RemoveMeta(name string) error {
return os.RemoveAll(f.getPath(name)) // RemoveAll succeeds if path doesn't exist
}