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

Sun Jul 19 20:40:27 UTC 2020

On Sun, Jul 19, 2020 at 10:04 PM Koopa Koopa <codingkoopa at gmail.com> wrote:
>
> 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.

Ok, I suspected that it might be an issue with timing, so it makes
sense that it's inconsistent.
>
> 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."

Yes, that's a known issue, the limit is set by Windows, but can be adjusted.
See this Gitlab report, there's also a link to the instructions how to
change it:

    https://gitlab.freedesktop.org/spice/win32/vd_agent/-/issues/2

The report concerns Win7, I'm not sure whether it applies to Win10 as
well, but you can give it a try.
>
> >>
> >> >>
> >> >>   (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).

Glad to hear that. I'll prepare a patch and send it for review.
>
> 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.

Once again, thanks for your help and time :)
>
> > 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!