Unable to pass SSH Private Key as --build-arg

[slashr]

Actual behavior
I have added my SSH private and public key as secrets inside my Jenkins master. Inside the Jenkinsfile, I fetch these secrets and then pass them to Kaniko using --build-arg pub_key=${JENKINS_SECRET_PUB_KEY} and --build-arg=pub_key=${JENKINS_SECRET_PRIV_KEY}
The public key is passed correctly however I get the following error for the private key:

Error: bad flag syntax: -----END Usage: executor [flags]

The -----END is indicating the end of the private key text. I'm assuming there's some problem with parsing the private key text since it ends like this
...D32UDBw== -----END OPENSSH PRIVATE KEY-----

The = sign at the end might be throwing Kaniko off.

Expected behavior
To be able to pass a SSH private key to the Dockerfile as --build-arg

To Reproduce
Steps to reproduce the behavior:

1. Pass a private key file text as a --build-arg to a Dockerfile using Kaniko

[tejal29]

Can you try enclosing the ${JENKINS_SECRET_PRIV_KEY} value in quotes ?

[antechrestos]

Maybe it will be solved once this issue will be. You'll only have to reference the argument JENKINS_SECRET_PUB_KEY in your dockerfile and run kaniko with option --build-arg JENKINS_SECRET_PUB_KEY (I do it the same way in gitlab ci so as not to reveal any secret in my .gitlab-ci.yml or build logs)

[lzadjsf]

I solved it by passing the rsa keys as a base64 string, given docker is expecting a one line command.