GNU bug report logs - #32075
netcat with '-U' option for connection virt-manager to libvirt over SSH

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Oleg Pykhalov <go.wigust <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: netcat with '-U' option for connection virt-manager to libvirt over
 SSH
Date: Sat, 07 Jul 2018 02:31:35 +0300

[Message part 1 (text/plain, inline)]

Hello Guix,

I try to use virt-manager for connection over SSH from Linux Mint to
GuixSD running libvirt.

Seems we need to package netcat which includes ‘-U’ option:
--8<---------------cut here---------------start------------->8--- Unable
Unable to connect to libvirt qemu+ssh://natsu <at> secret.foo/system.

The remote host requires a version of netcat/nc which supports the -U option.

Libvirt URI is: qemu+ssh://natsu <at> secret.foo/system

Traceback (most recent call last):
  File "/gnu/store/pakiz00asgm6cq5l4xwbwzksd0z576iq-virt-manager-1.5.1/share/virt-manager/virtManager/connection.py", line 1036, in _do_open
    self._backend.open(self._do_creds_password)
  File "/gnu/store/pakiz00asgm6cq5l4xwbwzksd0z576iq-virt-manager-1.5.1/share/virt-manager/virtinst/connection.py", line 144, in open
    open_flags)
  File "/gnu/store/xdyrp8fbcgk2cnyck4yda2wl1vql1m82-python2-libvirt-4.1.0/lib/python2.7/site-packages/libvirt.py", line 105, in openAuth
    if ret is None:raise libvirtError('virConnectOpenAuth() failed')
libvirtError: End of file while reading data: nc: invalid option -- 'U'
Try `nc --help' for more information.: Input/output error
--8<---------------cut here---------------end--------------->8---

Thanks,
Oleg.

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Message #8 received at 32075 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Oleg Pykhalov <go.wigust <at> gmail.com>
Cc: 32075 <at> debbugs.gnu.org
Subject: Re: bug#32075: netcat with '-U' option for connection virt-manager to
 libvirt over SSH
Date: Wed, 11 Jul 2018 13:15:25 +0200

Hi Oleg,

Oleg Pykhalov <go.wigust <at> gmail.com> skribis:

> libvirtError: End of file while reading data: nc: invalid option -- 'U'
> Try `nc --help' for more information.: Input/output error

There are several implementation of Netcat, and presumably libvirt
expects a different one.

Could you check which implementation you have on other distros?

TIA,
Ludo’.

Message #11 received at 32075 <at> debbugs.gnu.org (full text, mbox):

From: Leo Famulari <leo <at> famulari.name>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: Oleg Pykhalov <go.wigust <at> gmail.com>, 32075 <at> debbugs.gnu.org
Subject: Re: bug#32075: netcat with '-U' option for connection virt-manager
 to libvirt over SSH
Date: Wed, 11 Jul 2018 12:10:06 -0400

[Message part 1 (text/plain, inline)]

On Wed, Jul 11, 2018 at 01:15:25PM +0200, Ludovic Courtès wrote:
> Hi Oleg,
> 
> Oleg Pykhalov <go.wigust <at> gmail.com> skribis:
> 
> > libvirtError: End of file while reading data: nc: invalid option -- 'U'
> > Try `nc --help' for more information.: Input/output error
> 
> There are several implementation of Netcat, and presumably libvirt
> expects a different one.
> 
> Could you check which implementation you have on other distros?

Besides the 'netcat' package, there are netcat implementations that
offer the '-U' option provided by the nmap and LibreSSL packages.

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Message #14 received at 32075 <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: Oleg Pykhalov <go.wigust <at> gmail.com>
Cc: Ludovic Courtès <ludo <at> gnu.org>, 32075 <at> debbugs.gnu.org,
 Leo Famulari <leo <at> famulari.name>
Subject: Re: bug#32075: netcat with '-U' option for connection virt-manager
 to libvirt over SSH
Date: Fri, 29 Dec 2023 23:16:57 -0500

Hi Oleg,

Oleg Pykhalov <go.wigust <at> gmail.com> writes:

> Hello Guix,
>
> I try to use virt-manager for connection over SSH from Linux Mint to
> GuixSD running libvirt.
>
> Seems we need to package netcat which includes ‘-U’ option:
> --8<---------------cut here---------------start------------->8--- Unable
> Unable to connect to libvirt qemu+ssh://natsu <at> secret.foo/system.
>
> The remote host requires a version of netcat/nc which supports the -U option.
>
> Libvirt URI is: qemu+ssh://natsu <at> secret.foo/system
>
> Traceback (most recent call last):
>   File "/gnu/store/pakiz00asgm6cq5l4xwbwzksd0z576iq-virt-manager-1.5.1/share/virt-manager/virtManager/connection.py", line 1036, in _do_open
>     self._backend.open(self._do_creds_password)
>   File "/gnu/store/pakiz00asgm6cq5l4xwbwzksd0z576iq-virt-manager-1.5.1/share/virt-manager/virtinst/connection.py", line 144, in open
>     open_flags)
>   File "/gnu/store/xdyrp8fbcgk2cnyck4yda2wl1vql1m82-python2-libvirt-4.1.0/lib/python2.7/site-packages/libvirt.py", line 105, in openAuth
>     if ret is None:raise libvirtError('virConnectOpenAuth() failed')
> libvirtError: End of file while reading data: nc: invalid option -- 'U'
> Try `nc --help' for more information.: Input/output error
> --8<---------------cut here---------------end--------------->8---

I'm missing reproduction steps; is this still a problem with our current
libvirt and virt-manager packages?

-- 
Thanks,
Maxim

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