Re: [linuxtools-dev] LTTng 2.0 connection type

[Anna Dushistova <anna.dushistova@xxxxxxxxx>]

I filed a bug for it and attached a patch for further discussions:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=382684

Anna.

On Thu, Jun 14, 2012 at 2:41 AM, Anna Dushistova
<anna.dushistova@xxxxxxxxx> wrote:
> 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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