rsync failed: ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory

[Shiran]

Hi,

I'm copying files from one machine to another (to cg-sv-h118 in the log below) using rsync command.

Important to say that this command is working as expected in other machines I use (all have the same setup)

Can you help me understand the yellow errors below?

Thanks!

Log:

22:22:15 Building remotely on cg-sv-h118 in workspace /local/jenkins_ws/workspace/open_val
22:22:15 [open_val] $ /bin/bash /tmp/hudson8936548899971970339.sh
22:22:15 Starting to rsync files from parent workspace: icsl7024:/tmp/jenkins_ws/workspace/post_trigger
22:22:15 ************************************************
22:22:15 Use of this system by unauthorized persons or   
22:22:15 in an unauthorized manner is strictly prohibited
22:22:15 ************************************************
22:22:15 ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory
22:22:16 ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory
22:22:17 ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory
22:22:17 Permission denied (gssapi-with-mic,publickey).
22:22:17 rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
22:22:17 rsync error: unexplained error (code 255) at io.c(226) [Receiver=3.1.1]

[Michael Pailloncy]

ssh is asking for the password or a passphrase if the key is invalid. Is-there a passphrase configured for this key ? Have you tried to connect directly using ssh from this machine to the target one ?

BTW, how do you provide credentials ?

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[Shiran]

Hi,

I'm connecting to this node via ssh , and I have the host and credentials configured in the node's configuration in Jenkins.

The same rsync command is working just fine when I'm doing it outside Jenkins.

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[Michael Pailloncy]

Ok, if I refer to logs above, you want to copy files from icsl7024 machine to cg-sv-h118 workspace. Right ?

My question was not very clear, but I would like to know how do you provide credentials between cg-sv-h118 and icsl7024 machines ? 

Can you please also confirm that outside of Jenkins, you are able to connect from cg-sv-h118 to icsl7024 through SSH (without password) ?

Can you also check if /home/${USER}/.ssh/ directory and /home/${USER}/.ssh/authorized_keys file have the correct file permissions (respectively 700 and 644) on both machines ?

Michaël

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[Shiran]

Hi,

• Yes- I'm trying to copy files from icsl7024 to cg-sv-h118.
  
• I am not, explicitly, providing credentials between cg-sv-h118 and icsl7024. What is happening is that when the build starts, I am already connected to cg-sv-h118 (with the correct username and password), and then I'm just doing rsync between the machines.
• Outside of Jenkins I am able to connect from cg-sv-h118 to icsl7024 (they both use the same username...)
  
• I checked the permission of  ~/.ssh and ~/.ssh/authorized_keys and they are as expected (700 and 644), on both machines.
  

[Mark Waite]

I wonder if rsync has a similar behavior to command line git.

Command line git prompts for credentials if there is a controlling terminal attached to the process.

You could check that by running the rsync command prefixed with the setsid command so that the controlling terminal is disconnected. 

Mark Waite 

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[Shiran]

I can tell you this- I have more machines that supposed to be configured just like cg-sv-h118  (I guess there is something different that I didn't find yet). Only cg-sv-h118 is giving me the errors I mentioned.

but, I did saw the "ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory Permission denied (gssapi-with-mic,publickey)."  error before, in other machines similar to cg-sv-118 but it happened sporadically (not in every build, while coping files from different machines similar to icsl7024)

I tried running rsync with setsid prefix - both in Jenkins and locally and it works ok. What behavior was I suppose to expect? 

[Mark Waite]

If it works ok with setsid, then isn't that the solution to your issue?

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[Shiran]

Hi again,

I let it run all night in Jenkins (with setsid), and in 5 out of 18 I got the error of  "ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory Permission denied (gssapi-with-mic,publickey)."

So I guess it didn't solve the problem...

[Mark Waite]

You might check to see if there is a pattern which ties the failures to a specific node, or a specific time of day, or a specific set of log entries on the Jenkins agent.  I can't explain why it would find it one time and not find it the next, unless something changed in the execution environment between the passing and the failing cases.

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