Bash completion for "show" and "config" seems to have stopped working with the update to Trixie

[cpackham-atlnz]

Locally we've been tracking the 202511 branch of sonic-buildimage and have pulled in the Trixie update. The completion for "show" and "config" seems to have stopped working.

[cpackham-atlnz]

I think this might have something to do with changes in the version of click that gets used (possibly due to the Trixie package version or another version bump).

Following the docs[1] using the code generated by eval "$(_SHOW_COMPLETE=bash_source show)" seems to work although it's a bit more verbose than one might like.

[1] - https://click.palletsprojects.com/en/stable/shell-completion/

[cpackham-atlnz]

I think this was a breaking change in click 8.0.0 https://github.com/pallets/click/blob/main/CHANGES.rst#version-800

The env var values used to start completion have changed order. The shell now comes first, such as {shell}source rather than source{shell}, and is always required.

It looks like prior to that the keyword was complete for bash and complete_(zsh|fish) for zsh/fish then things got reorganized a couple of times and settled on {shell}_complete by the time 8.0.0 was released.

[cpackham-atlnz]

See also sonic-net/sonic-buildimage#24594