[bug #45335] Can't access parent directory on FAT when it's the filesystem root

[Max Zerzouri]

URL:
  <http://savannah.gnu.org/bugs/?45335>

                 Summary: Can't access parent directory on FAT when it's the
filesystem root
                 Project: GNU GRUB
            Submitted by: maxdamantus
            Submitted on: Tue 16 Jun 2015 11:31:22 PM GMT
                Category: None
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Max Zerzouri
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Git master
         Reproducibility: Every Time
         Planned Release: None

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Details:

The special `..` and `.` filenames behave strangely on FAT when dealing with
the root directory. Particularly, it seems to be impossible to traverse to
the
root given a non-root path without something like a `regexp` hack to extract
the device identifier:

  grub> ls (hd1,gpt2)/
  grub/ efi/ vmlinuz initramfs.gz NvVars
  grub> ls (hd1,gpt2)/grub
  i386-pc/ locale/ themes/ fonts/ grub.cfg grubenv
  grub> ls (hd1,gpt2)/grub/..
  
  grub> ls (hd1,gpt2)/grub/i386-pc/..
  i386-pc/ locale/ themes/ fonts/ grub.cfg grubenv
  grub> ls (hd1,gpt2)/..
  error: file `/..' not found.
  grub> ls (hd1,gpt2)/.
  error: file `/.' not found.
  grub> ls (hd1,gpt2)/grub/.
  i386-pc/ locale/ themes/ fonts/ grub.cfg grubenv

As shown, accessing `.` from the root also doesn't work (it works on other
directories in FAT and on roots of other filesystems (at least squashfs and
ext)). This might be related, but it seems less important and could just be a
usability issue.




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