78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package filerw
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import (
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"io"
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"os"
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"github.com/pkg/errors"
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"d7y.io/dragonfly/v2/pkg/util/fileutils"
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)
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// CopyFile copies the file, not dir, src to dst.
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func CopyFile(src, dst string) (written int64, err error) {
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var (
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s *os.File
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d *os.File
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)
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if !fileutils.IsRegular(src) {
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return 0, errors.Errorf("copy %s to %s: src is not a regular file", src, dst)
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}
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if fileutils.IsDir(dst) {
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return 0, errors.Errorf("copy %s to %s: dst is a directory", src, dst)
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}
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if s, err = os.Open(src); err != nil {
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return 0, errors.Wrapf(err, "failed to copy %s to %s", src, dst)
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}
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defer s.Close()
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if d, err = fileutils.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
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return 0, errors.Wrapf(err, "failed to copy %s to %s", src, dst)
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}
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defer d.Close()
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return io.Copy(d, s)
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}
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// MoveFile moves the file, not dir, src to dst.
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func MoveFile(src, dst string) error {
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if !fileutils.IsRegular(src) {
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return errors.Errorf("move %s to %s: src is not a regular file", src, dst)
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}
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if err := os.Rename(src, dst); err != nil {
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if _, err := CopyFile(src, dst); err != nil {
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return errors.Wrapf(err, "failed to copy %s to %s", src, dst)
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}
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if err := fileutils.DeleteFile(src); err != nil {
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return errors.Wrapf(err, "failed to delete %s", src)
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}
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}
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return nil
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}
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// CleanFile cleans content of the file.
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func CleanFile(path string) error {
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return os.Truncate(path, 0)
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}
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