Add "target-file" and "merge" flag to airshipctl cluster get-kubeconfig command

[teoyaomiqui]

Problem description (if applicable)
In addition to writing kubeconfig to stdout, it would be convenient to append kubeconfig or overwrite it.

If you use redirect kubeconfig to a file, airshipctl cluster get-kubeconfig > ~/.airship/kubeconfig, redirect > immediately removes the content of the target file, which makes airshipctl unable to use it.

The flag would allow using the flag and then overwrite the file.

Also, the additional flag can be used to merge the contexts from the new kubeconfig into a new one. This will allow extend kubeconfig instead of overriding its entire content.

Proposed change
Add two flags to airshipctl cluster get-kubeconfig --target-file ~/.airship/kubeconfig --merge

--merge (boolean) will allow merging contexts
--target-file (string) will allow specifying target file

NOTE: Actual flag names should be discussed.

[teoyaomiqui]

@vetbijaya all urs

[vetbijaya]

@teoyaomiqui , thank you.

[airshipbot]

Related Change #784111

Subject: Add flags to airshipctl get-kubeconfig cmd
Link: https://review.opendev.org/c/airship/airshipctl/+/784111
Status: NEW
Owner: Bijaya Sharma (vetbijaya@gmail.com)

This change will close this issue when merged.

Approvals

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Verified
-1 Zuul
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Last Updated: 2021-05-26 09:18:59 CDT