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copy.go
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copy.go
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/*
Copyright 2023 The Nuclio Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package util
import (
"fmt"
"io"
"os"
"path"
"path/filepath"
"github.com/nuclio/nuclio/pkg/common"
"github.com/nuclio/errors"
)
// CopyTo copies source to dest
// If source is a file and dest is a file, performs copy file
// If source is a dir and dest is a dir, performs copy dir
// If source is a file and dest is a dir, copies source to the dest dir with the same name
// If source is a dir and dest is a file, returns error
func CopyTo(source string, dest string) error {
sourceIsFile := common.IsFile(source)
destIsFile := common.IsFile(dest)
// dir -> file
if !sourceIsFile && destIsFile {
return errors.New("Cannot copy directory to file")
}
// file -> file
if sourceIsFile && destIsFile {
return CopyFile(source, dest)
}
// dir -> dir
if !sourceIsFile && !destIsFile {
_, err := CopyDir(source, dest)
return err
}
// file -> dir
if sourceIsFile && !destIsFile {
// get the source file name
sourceFileName := path.Base(source)
// dest is dest dir + source file name
dest = path.Join(dest, sourceFileName)
// get the destination as the dest dir +
return CopyFile(source, dest)
}
return errors.New("Should not get here")
}
// CopyFile copies file source to destination dest.
func CopyFile(source string, dest string) error {
sf, err := os.Open(filepath.Clean(source))
if err != nil {
return err
}
defer sf.Close() // nolint: errcheck
df, err := os.Create(dest)
if err != nil {
return err
}
defer df.Close() // nolint: errcheck
if _, err = io.Copy(df, sf); err != nil {
return err
}
si, err := sf.Stat()
if err == nil {
return os.Chmod(dest, si.Mode())
}
return nil
}
// CopyDir Recursively copies a directory tree, attempting to preserve
// permissions. Source directory must exist, destination directory must *not*
// exist.
func CopyDir(source string, dest string) (bool, error) {
if source == dest {
return true, nil
}
// get properties of source dir
fi, err := os.Stat(source)
if err != nil {
return false, nil
}
if !fi.IsDir() {
return false, fmt.Errorf("Source (%q) is not a directory", source)
}
// create dest dir
err = os.MkdirAll(dest, fi.Mode())
if err != nil {
return false, err
}
entries, err := os.ReadDir(filepath.Clean(source))
if err != nil {
return false, err
}
for _, entry := range entries {
sfp := filepath.Join(source, entry.Name())
dfp := filepath.Join(dest, entry.Name())
if entry.IsDir() {
_, err = CopyDir(sfp, dfp)
if err != nil {
return false, err
}
} else {
// perform copy
err = CopyFile(sfp, dfp)
if err != nil {
return false, err
}
}
}
return true, nil
}