Re: [linuxtools-dev] LTTng 2.0 connection type

[Anna Dushistova <anna.dushistova@xxxxxxxxx>]

Hi Bernd,

I looked through the code and didn't notice any use of ssh/sftp
specific classes/methods.
I personally would like to be able to use LTTng 2.0 through any
connection that has
files and shells/terminals subsystems, be it over SSH or TCF or anything else.
I implemented something like this in org.eclipse.cdt.launch.remote[1].
We could do the same
for LTTng 2.0 if there are no restrictions from the remote side.
What do you think?

[1] http://git.eclipse.org/c/cdt/org.eclipse.cdt.git/tree/cross/org.eclipse.cdt.launch.remote/src/org/eclipse/cdt/launch/remote/RSEHelper.java
, see methods like getSuitableConnections(),
getSubsystemWithShellService()...

Anna.

On Wed, Jun 13, 2012 at 5:55 PM, Bernd Hufmann <bhufmann@xxxxxxxxx> wrote:
> Hi Anna
>
> You're right the LTTng 2.0 connection type also needs a sftp_server to
> be available on the remote side. This is used for importing traces
> from the remote node. I've already updated the user documentation on
> the wiki.
>
> The LTTng 2.0 connection type (RSE system type) uses internally the
> RSE subsystem type ssh.shells for executing LTTng 2.0 commands. It
> also uses ssh.files for importing traces from the remote system to the
> Eclipse workspace. The type ssh.files uses a sftp implementation
> internally.
>
> As a test, I disabled sftp on my test remote host. The first time I
> try to connect I get an exception with a message that sftp_server is
> not installed. Then, when I do the connection the second time I don't
> get this exception and the shell subsystem connects. Once the
> connection is established I was able to use the tracer control. Of
> course importing of traces fails. However, having to deal with
> exception is not very convenient.
>
> I have to investigate further how the LTTng 2.0 tracer control in
> Eclipse can support the RSE scp implementation that you suggested as
> an alternative to sftp. I'll get back to you when I know more.
>
> Best Regards
> Bernd
>
> On Wed, Jun 13, 2012 at 3:41 AM, Anna Dushistova
> <anna.dushistova@xxxxxxxxx> wrote:
>> Hi All,
>>
>> I have a question about LTTng2.0 connection type. Documentation says
>> "requires an SSH server to be running on the remote host".
>> My remote host has ssh, however, it doesn't have sftp, which is
>> actually very common in the embedded world.
>> TM has now an SCP file subsystem
>> (http://www.eclipse.org/downloads/download.php?file=/tm/downloads/drops/S-3.4RC2-201205300905/RSE-scp-incubation-3.4RC2.zip)
>> that allows file transfer over scp. Could we maybe offer a choice
>> between these two subsystems during connection creation process?
>> Another option might be adding the SFTP requirement to the documentation.
>>
>> Let me know what you think!
>> Thanks!
>> Anna.
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