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

[Jakub Janku]

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.
>
>   (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

>
> 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