What about this patch? Looks correct to me and reflects actual behavior.
В Sun, 02 Jun 2013 16:48:23 +0200
Francesco Lavra <francescolavra...@gmail.com> пишет:
> On 05/18/2013 12:26 PM, Francesco Lavra wrote:
> > On 05/12/2013 12:56 PM, Francesco Lavra wrote:
> >> Currently, listing of the root directory of a device with the command:
> >> ls (device_name)
> >> requires the underlying filesystem driver to handle an empty path
> >> string as if it was the root directory path "/". This introduces
> >> duplicated code across the different filesystem drivers. If a given
> >> filesystem driver does not implement special handling of the empty
> >> path string, the above command gives "error: invalid file name `'."
> >> This error happens for instance with the ext4 filesystem.
> >> The best place to handle correctly the empty path string and transform
> >> it in "/" is the function grub_core_cmd_ls(), so that handling from
> >> each filesystem driver is not required anymore.
> >
> > After revision 5010, issuing the ls command with a device name as
> > parameter gives a response such as:
> > (device_name): Filesystem is <filesystem name>.
> > But grub.texi says:
> > "
> > @deffn Command ls [arg @dots{}]
> > List devices or files.
> >
> > With no arguments, print all devices known to GRUB.
> >
> > If the argument is a device name enclosed in parentheses (@pxref{Device
> > syntax}), then list all files at the root directory of that device.
> >
> > If the argument is a directory given as an absolute file name (@pxref{File
> > name syntax}), then list the contents of that directory.
> > @end deffn
> > "
> >
> > Which is the correct behavior?
>
> Depending on the answer to the above question, you might want to
> consider applying one of the two patches below, as you see fit.
>
> Regards,
> Francesco
>
> 2013-06-02 Francesco Lavra <francescolavra...@gmail.com>
>
> * docs/grub.texi (ls): Fix command description in case of a device name
> passed as argument.
>
> === modified file 'docs/grub.texi'
> --- docs/grub.texi 2013-05-11 05:23:26 +0000
> +++ docs/grub.texi 2013-06-02 14:35:24 +0000
> @@ -4049,7 +4049,7 @@
> With no arguments, print all devices known to GRUB.
>
> If the argument is a device name enclosed in parentheses (@pxref{Device
> -syntax}), then list all files at the root directory of that device.
> +syntax}), then print the name of the filesystem of that device.
>
> If the argument is a directory given as an absolute file name (@pxref{File
> name syntax}), then list the contents of that directory.
>
>
> 2013-06-02 Francesco Lavra <francescolavra...@gmail.com>
>
> * grub-core/kern/corecmd.c (grub_core_cmd_ls): Fix listing of root
> directory contents.
>
> === modified file 'grub-core/kern/corecmd.c'
> --- grub-core/kern/corecmd.c 2013-06-02 14:23:14 +0000
> +++ grub-core/kern/corecmd.c 2013-06-02 14:28:24 +0000
> @@ -147,13 +147,11 @@
>
> if (! *path)
> {
> - if (grub_errno == GRUB_ERR_UNKNOWN_FS)
> - grub_errno = GRUB_ERR_NONE;
> -
> - grub_printf ("(%s): Filesystem is %s.\n",
> - device_name, fs ? fs->name : "unknown");
> + /* The argument is a device name: list all files at the root directory
> + of the device. */
> + path = (char *) "/";
> }
> - else if (fs)
> + if (fs)
> {
> (fs->dir) (dev, path, grub_mini_print_files, NULL);
> grub_xputs ("\n");
>
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