github.com/minio/minio@v0.0.0-20240328213742-3f72439b8a27/internal/mountinfo/mountinfo_windows.go (about)

     1  //go:build windows
     2  // +build windows
     3  
     4  // Copyright (c) 2015-2021 MinIO, Inc.
     5  //
     6  // This file is part of MinIO Object Storage stack
     7  //
     8  // This program is free software: you can redistribute it and/or modify
     9  // it under the terms of the GNU Affero General Public License as published by
    10  // the Free Software Foundation, either version 3 of the License, or
    11  // (at your option) any later version.
    12  //
    13  // This program is distributed in the hope that it will be useful
    14  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  // GNU Affero General Public License for more details.
    17  //
    18  // You should have received a copy of the GNU Affero General Public License
    19  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
    20  
    21  package mountinfo
    22  
    23  import (
    24  	"path/filepath"
    25  	"sync"
    26  
    27  	"golang.org/x/sys/windows"
    28  )
    29  
    30  // CheckCrossDevice - check if any input path has multiple sub-mounts.
    31  // this is a dummy function and returns nil for now.
    32  func CheckCrossDevice(paths []string) error {
    33  	return nil
    34  }
    35  
    36  // mountPointCache contains results of IsLikelyMountPoint
    37  var mountPointCache sync.Map
    38  
    39  // IsLikelyMountPoint determines if a directory is a mountpoint.
    40  func IsLikelyMountPoint(path string) bool {
    41  	path = filepath.Dir(path)
    42  	if v, ok := mountPointCache.Load(path); ok {
    43  		return v.(bool)
    44  	}
    45  	wpath, _ := windows.UTF16PtrFromString(path)
    46  	wvolume := make([]uint16, len(path)+1)
    47  
    48  	if err := windows.GetVolumePathName(wpath, &wvolume[0], uint32(len(wvolume))); err != nil {
    49  		mountPointCache.Store(path, false)
    50  		return false
    51  	}
    52  
    53  	switch windows.GetDriveType(&wvolume[0]) {
    54  	case windows.DRIVE_FIXED, windows.DRIVE_REMOVABLE, windows.DRIVE_REMOTE, windows.DRIVE_RAMDISK:
    55  		// Recognize "fixed", "removable", "remote" and "ramdisk" drives as proper drives
    56  		// which can be treated as an actual mount-point, rest can be ignored.
    57  		// https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-getdrivetypew
    58  		mountPointCache.Store(path, true)
    59  		return true
    60  	}
    61  	mountPointCache.Store(path, false)
    62  	return false
    63  }