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126 lines
3.0 KiB
Go
126 lines
3.0 KiB
Go
package mountlib
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/rclone/rclone/fs"
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)
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// ClipBlocks clips the blocks pointed to the OS max
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func ClipBlocks(b *uint64) {
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var max uint64
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switch runtime.GOOS {
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case "windows":
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if runtime.GOARCH == "386" {
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max = (1 << 32) - 1
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} else {
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max = (1 << 43) - 1
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}
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case "darwin":
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// OSX FUSE only supports 32 bit number of blocks
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// https://github.com/osxfuse/osxfuse/issues/396
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max = (1 << 32) - 1
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default:
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// no clipping
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return
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}
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if *b > max {
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*b = max
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}
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}
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// CheckOverlap checks that root doesn't overlap with a mountpoint
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func CheckOverlap(f fs.Fs, mountpoint string) error {
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name := f.Name()
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if name != "" && name != "local" {
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return nil
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}
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rootAbs := absPath(f.Root())
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mountpointAbs := absPath(mountpoint)
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if strings.HasPrefix(rootAbs, mountpointAbs) || strings.HasPrefix(mountpointAbs, rootAbs) {
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const msg = "mount point %q (%q) and directory to be mounted %q (%q) mustn't overlap"
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return fmt.Errorf(msg, mountpoint, mountpointAbs, f.Root(), rootAbs)
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}
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return nil
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}
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// absPath is a helper function for CheckOverlap
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func absPath(path string) string {
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if abs, err := filepath.EvalSymlinks(path); err == nil {
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path = abs
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}
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if abs, err := filepath.Abs(path); err == nil {
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path = abs
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}
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path = filepath.ToSlash(path)
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if runtime.GOOS == "windows" {
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// Removes any UNC long path prefix to make sure a simple HasPrefix test
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// in CheckOverlap works when one is UNC (root) and one is not (mountpoint).
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path = strings.TrimPrefix(path, `//?/`)
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}
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if !strings.HasSuffix(path, "/") {
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path += "/"
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}
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return path
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}
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// CheckAllowNonEmpty checks --allow-non-empty flag, and if not used verifies that mountpoint is empty.
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func CheckAllowNonEmpty(mountpoint string, opt *Options) error {
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if !opt.AllowNonEmpty {
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return CheckMountEmpty(mountpoint)
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}
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return nil
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}
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// checkMountEmpty checks if mountpoint folder is empty by listing it.
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func checkMountEmpty(mountpoint string) error {
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fp, err := os.Open(mountpoint)
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if err != nil {
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return fmt.Errorf("cannot open: %s: %w", mountpoint, err)
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}
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defer fs.CheckClose(fp, &err)
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_, err = fp.Readdirnames(1)
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if err == io.EOF {
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return nil
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}
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const msg = "%q is not empty, use --allow-non-empty to mount anyway"
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if err == nil {
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return fmt.Errorf(msg, mountpoint)
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}
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return fmt.Errorf(msg+": %w", mountpoint, err)
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}
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// SetVolumeName with sensible default
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func (m *MountPoint) SetVolumeName(vol string) {
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if vol == "" {
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vol = fs.ConfigString(m.Fs)
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}
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m.MountOpt.SetVolumeName(vol)
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}
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// SetVolumeName removes special characters from volume name if necessary
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func (o *Options) SetVolumeName(vol string) {
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vol = strings.ReplaceAll(vol, ":", " ")
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vol = strings.ReplaceAll(vol, "/", " ")
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vol = strings.TrimSpace(vol)
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if runtime.GOOS == "windows" && len(vol) > 32 {
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vol = vol[:32]
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}
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o.VolumeName = vol
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}
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// SetDeviceName with sensible default
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func (m *MountPoint) SetDeviceName(dev string) {
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if dev == "" {
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dev = fs.ConfigString(m.Fs)
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}
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m.MountOpt.DeviceName = dev
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}
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