[WIP] Initial commit

vendor/github.com/cockroachdb/pebble/filenames.go

@@ -0,0 +1,54 @@
+// Copyright 2012 The LevelDB-Go and Pebble Authors. All rights reserved. Use
+// of this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+package pebble
+
+import (
+	"fmt"
+
+	"github.com/cockroachdb/pebble/internal/base"
+	"github.com/cockroachdb/pebble/vfs"
+)
+
+type fileType = base.FileType
+
+// FileNum is an identifier for a file within a database.
+type FileNum = base.FileNum
+
+const (
+	fileTypeLog      = base.FileTypeLog
+	fileTypeLock     = base.FileTypeLock
+	fileTypeTable    = base.FileTypeTable
+	fileTypeManifest = base.FileTypeManifest
+	fileTypeCurrent  = base.FileTypeCurrent
+	fileTypeOptions  = base.FileTypeOptions
+	fileTypeTemp     = base.FileTypeTemp
+	fileTypeOldTemp  = base.FileTypeOldTemp
+)
+
+// setCurrentFile sets the CURRENT file to point to the manifest with
+// provided file number.
+//
+// NB: This is a low-level routine and typically not what you want to
+// use. Newer versions of Pebble running newer format major versions do
+// not use the CURRENT file. See setCurrentFunc in version_set.go.
+func setCurrentFile(dirname string, fs vfs.FS, fileNum base.DiskFileNum) error {
+	newFilename := base.MakeFilepath(fs, dirname, fileTypeCurrent, fileNum)
+	oldFilename := base.MakeFilepath(fs, dirname, fileTypeTemp, fileNum)
+	fs.Remove(oldFilename)
+	f, err := fs.Create(oldFilename)
+	if err != nil {
+		return err
+	}
+	if _, err := fmt.Fprintf(f, "MANIFEST-%s\n", fileNum); err != nil {
+		return err
+	}
+	if err := f.Sync(); err != nil {
+		return err
+	}
+	if err := f.Close(); err != nil {
+		return err
+	}
+	return fs.Rename(oldFilename, newFilename)
+}