The netctl package in core contains both netctl and netctl-auto bash completion functions. However, the netctl-auto completion functions are found in /usr/share/bash-completion/completions/netctl, which does not allow for the netctl-auto bash completions to be recognized.

When attempting a completion for netctl-auto, the default completion is used:
$ netctl-auto
Display all 106 possibilities? (y or n)

The simplest fix is to add a symlink to the netctl bash completion scripts named netctl-auto:
ln -s /usr/share/bash-completion/completions/netctl $pkgdir/usr/share/bash-completion/completions/netctl-auto

Alternatively a bash script just sourcing the netctl scripts named netctl-auto would work.

When such a file is installed the completion output looks like this:

$ netctl-auto
disable enable-all is-enabled --version
disable-all --help list
enable is-active switch-to

Additional info:
This is with the latest version of netctl (1.13-2) and bash-completion (2.7-1) on an up to date Arch system.


Steps to reproduce:
Install netctl and bash-completion and attempt a bash completion on netctl-auto.
Next install a symlink as described above, open a new bash shell to resource the completion files, and again attempt a completion on netctl-auto.