Re: [Info-mtools] Inconsistent results between kernel vfat and mtools

[Alexander Huemer]

Hi!

Thanks for the quick response!

On Tue, Nov 21, 2023 at 01:03:16PM +0000, G.W. Haywood wrote:
> On Tue, 21 Nov 2023, Alexander Huemer wrote:
> 
> > I am observing inconsistent results between the kernel vfat
> > implementation and mtools.
> > The image file I am using is [1].
> > Here is a simple procedure that shows what I am experiencing.
> > 
> > Download the image. For simplicity that'll be called 'image.img' below.
> > 
> > mkdir -p ~/tmp/unpack
> > cd ~/tmp/unpack
> > mcopy -a ~/image.img -a :: .
> > sudo mount -t vfat ~/image.img /mnt
> > diff -u <(md5sum *) <(cd /mnt; md5sum *)
> > 
> > This is the result I am getting:
> > 
> > --- /dev/fd/63      2023-11-21 07:21:10.930270864 +0000
> > +++ /dev/fd/62      2023-11-21 07:21:10.930270864 +0000
> > @@ -1,7 +1,7 @@
> > -04ab6b3bd6f6689fe102a3531d15e8b1  003290.DSL
> > -50bb89afd3ddb2d7fe62946ee0d780f3  013179.dsl
> > -14c3e2c6c7c69d69c60e8a43b9c11ae1  023193.dsl
> > +b16167d015a5a427088eb0200a5ba051  003290.DSL
> > +00cd9c5a6948e029b310615b0fb074c2  013179.dsl
> > +b42bd0a7f6cf5a81da57a6008436e5fa  023193.dsl
> > fe80900bee88c24fa11089a9ababcf5e  CSCMCNME.CMD
> > -9c21964c22e263063f638630e66560eb  MAINTRK.DIA
> > +c94fc15f7efd09966c8bbc7ced0bab9d  MAINTRK.DIA
> > e07b8d18af7fe075c74a220d3a7cda30  MRNLEV.ECN
> > 428978ce5c2775926a4a1743b7af602e  VOLUME.LAB
> > 
> > I believe that the results yielded by vfat are correct and the results
> > yielded by mtools are incorrect.
> > 
> > Does the image file have some unusual properties that push mtools to
> > undesired behavior? User error?
> 
> First things first, which version of mtools are you using?

That's 4.0.43-1 (coming from the Debian testing repo).

> Here it's
> 
> 8<----------------------------------------------------------------------
> $ mtools -V
> mtools (GNU mtools) 4.0.43
> configured with the following options: enable-xdf disable-vold
> disable-new-vold disable-debug enable-raw-term
> 8<----------------------------------------------------------------------
> 
> Second, something does seem odd, but not quite that... :/
> 
> Here, mcopy seems to have no trouble, but mdir does:
> 
> 8<----------------------------------------------------------------------
> $ mdir -i IBM_3174_DSL_FC9021_N52.0.img
>  Volume in drive : has no label
> Directory for ::/
> 
> No files
>                             656 896 bytes free

I get the same output, though:

$ mdir -i IBM_3174_DSL_FC9021_N52.0.img -a ::
 Volume in drive : has no label
Directory for ::/

VOLUME   LAB       512 1986-06-06  11:47
MAINTRK  DIA     15360 1986-06-06  11:47
MRNLEV   ECN       512 1986-06-06  11:48
003290   DSL    180224 1986-06-06  11:48
013179   dsl    198144 1980-00-00   0:00
023193   dsl    157696 1980-00-00   0:00
CSCMCNME CMD      4168 1980-01-01   0:00
        7 files             556 616 bytes
                            656 896 bytes free

I am not a mtools guru. Maybe a listing should be produced without
'-a ::', I am not sure.

-Alex