41 lines
1.4 KiB
Go
41 lines
1.4 KiB
Go
// +build windows
|
|
|
|
package replacefile
|
|
|
|
import (
|
|
"os"
|
|
"syscall"
|
|
|
|
"golang.org/x/sys/windows"
|
|
)
|
|
|
|
// AtomicRename renames from the source path to the destination path,
|
|
// atomically replacing any file that might already exist at the destination.
|
|
//
|
|
// Typically this operation can succeed only if the source and destination
|
|
// are within the same physical filesystem, so this function is best reserved
|
|
// for cases where the source and destination exist in the same directory and
|
|
// only the local filename differs between them.
|
|
func AtomicRename(source, destination string) error {
|
|
// On Windows, renaming one file over another is not atomic and certain
|
|
// error conditions can result in having only the source file and nothing
|
|
// at the destination file. Instead, we need to call into the MoveFileEx
|
|
// Windows API function, setting two flags to opt in to replacing an
|
|
// existing file.
|
|
srcPtr, err := syscall.UTF16PtrFromString(source)
|
|
if err != nil {
|
|
return &os.LinkError{"replace", source, destination, err}
|
|
}
|
|
destPtr, err := syscall.UTF16PtrFromString(destination)
|
|
if err != nil {
|
|
return &os.LinkError{"replace", source, destination, err}
|
|
}
|
|
|
|
flags := uint32(windows.MOVEFILE_REPLACE_EXISTING | windows.MOVEFILE_WRITE_THROUGH)
|
|
err = windows.MoveFileEx(srcPtr, destPtr, flags)
|
|
if err != nil {
|
|
return &os.LinkError{"replace", source, destination, err}
|
|
}
|
|
return nil
|
|
}
|