[Spice-devel] Can't write from guest to host with webdav

Sun Jul 19 20:04:41 UTC 2020

On 7/19/20, Jakub Janku <jjanku at redhat.com> wrote:
> On Sun, Jul 19, 2020 at 6:12 PM Koopa Koopa <codingkoopa at gmail.com> wrote:
>>
>> On 7/19/20, Jakub Janku <jjanku at redhat.com> wrote:
>> > Hi!
>> >
>> > On Sun, Jul 19, 2020 at 9:34 AM Koopa Koopa <codingkoopa at gmail.com>
>> > wrote:
>> >>
>> >> Hi all,
>> >>
>> >> I'm looking to share a folder between my Arch Linux host and a Windows
>> >> 10
>> >> guest, and SPICE's folder sharing with webdav seems to be the best
>> >> option
>> >> for me. I've set up the QEMU devices that webdav needs, and installed
>> >> the
>> >> Windows service. I have the drive mapped, and am able to navigate the
>> >> host
>> >> folder (apart from the occasional "Windows cannot access
>> >> \\localhost at 9843\DavWWWRoot\" that doesn't occur again), and copy
>> >> files
>> >> from the host to the guest. When trying to copy a new file (with data)
>> >> or
>> >> write to an existing file from the guest, though, the application
>> >> (e.g.
>> >> File Explorer, or other programs which save files) hangs for a little
>> >> bit,
>> >> before the transaction fails. For File Explorer, it displays "Error
>> >> 0x80070021: The process cannot access the file because another process
>> >> has
>> >> locked a portion of the file."
>> >>
>> >> This is the output of remote-viewer:
>> >>   (remote-viewer:16120): GSpice-WARNING **: 12:58:46.205: Warning no
>> >> automount-inhibiting implementation available
>> >
>> > As you say, this happens in non-GNOME environments. But it's related
>> > to usb redirection, not webdav.
>> >>
>> >>   (remote-viewer:16120): phodav-WARNING **: 12:58:57.910:
>> >> (../phodav-2.4/libphodav/phodav-method-propfind.c:70):prop_resourcetype:
>> >> code should not be reached
>> >>
>> >>   (remote-viewer:16120): phodav-WARNING **: 12:59:04.714:
>> >> (../phodav-2.4/libphodav/phodav-method-propfind.c:70):prop_resourcetype:
>> >> code should not be reached
>> >
>> > I know that these warnings can happen for example if the shared folder
>> > contains a broken symlink. Is that your case? Basically anything in
>> > the shared folder that isn't a regular file or a directory can emit
>> > this warning, but it shouldn't cause the described issues afaik.
>>
>> Yep, that is the case. I had a broken symlink in the root directory of
>> my share, which explains why that error only occurred in that
>> directory. I've removed that file, and that error no longer occurs.
>
> Great, so that makes this one clear.
>>
>> As for the main issue, upon some more testing, I've determined that:
>> - I can copy files to the root of a $HOME share.
>> - I cannot copy files to a mounted device within the $HOME share.
>> - I cannot copy files to a share created at or within the mountpoint.
>>
>> The drive that my $HOME is on is ext4, and the mounted device (in
>> fact, there are two of these in my home directory) is NTFS.
>
> How frequent is this issue? Can you copy larger files?

It can be quite inconsistent. Currently, with the $HOME share -
without directly interacting with the mountpoint, I'm experiencing
either not being to copy to or from the host. Sometimes one works,
sometimes neither works. This seems to function the same between
remote-viewer and spicy.

With regards to file size, I have been using a 1.85KB CSV file and
11.7KB PNG file. Trying a 256MB MKV file, it is able to transfer form
the guest to the host (that is, when that direction is working with
other files too), but never from the host to the guest. Copying the
exact file that I had copied from the guest, back to the guest, I get
an error in File Explorer: "Error 0x800700DF: The file size exceeds
the limit allowed and cannot be saved."

>>
>> >>
>> >>   (remote-viewer:16120): GSpice-WARNING **: 12:59:04.793:
>> >> (../spice-gtk-0.38/src/channel-webdav.c:330):demux_to_client_cb:
>> >> runtime
>> >> check failed: (size == c->demux.size)
>> >>   phodav-Message: 13:00:06.047: missing lock: /testfile
>> >> urn:uuid:ceb212f1-f8af-4dd3-b36c-a7e627b6c08a
>> >>   phodav-Message: 13:00:06.062: missing lock: /testfile
>> >> urn:uuid:ceb212f1-f8af-4dd3-b36c-a7e627b6c08a
>> >>   phodav-Message: 13:00:06.076: missing lock: /testfile
>> >> urn:uuid:ceb212f1-f8af-4dd3-b36c-a7e627b6c08a
>> >
>> > I'm not able to reproduce it, so more logs would be helpful.
>> > Could you please run remote-viewer or spicy with the following options
>> > and attach the output?
>> > G_MESSAGES_DEBUG=phodav remote-viewer --spice-debug
>> >
>>
>> Sure. I've attached a remote-viewer log ran with those parameters,
>> from right before I copied the file, until the File Explorer error was
>> displayed. I had a share set up to where the mountpoint is the shared
>> directory, and copied a file named "export1.csv" to the root of the
>> share.
>
> Thanks a lot!
>
> Would you be able to recompile spice-gtk with the attached patch (it
> adds some more logs and could perhaps fix the issue)? If so, please
> send the output in the same fashion as you did now, spicy is just fine
> for this purpose.
>

With this patch applied, I am able to copy files to and from the host
without any issues. The file limitation when copying from host to
guest still exists, but that seems very much like an unrelated thing
(and perhaps a non-issue).

I have attached the log from the unpatched build of spicy, and from
the patched (and seemingly fixed!) build of spicy. Both log files
still begin when starting the transfer, and end when File Explorer
ends or succeeds.

> Cheers,
> Jakub
>>
>> >>
>> >> I read that the first GSpice error always occurs on non-GNOME host
>> >> environments. The phodav error occurs whenever I view the root
>> >> directory
>> >> of the share, or try copying/writing to a file anywhere in the share.
>> >> The
>> >> second GSpice and other phodav messages occur when copying/writing a
>> >> file
>> >> in the share.
>> >>
>> >> This occurs both with remote-viewer, and spicy. The same result occurs
>> >> whether or not I have the "Read only" checkbox in remote-viewer
>> >> checked.
>> >>
>> >> Thanks!
>> >> _______________________________________________
>> >> Spice-devel mailing list
>> >> Spice-devel at lists.freedesktop.org
>> >> https://lists.freedesktop.org/mailman/listinfo/spice-devel
>> >
>> > Thanks,
>> > Jakub
>> >
>> >
>>
>> Thanks!
>

Thanks!
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