kubernetes: kubectl bash completion causes bash file path completion to fail

I’m on Windows with MinGW. After digging into system directories, it seems bash_completion script which contains helper functions such as _filedir is missing.

I had to get files from Git repository at https://github.com/scop/bash-completion/blob/master/bash_completion to /usr/share/bash-completion/bash_completion

Then add following line on top of my ~/.bashrc:

source /usr/share/bash-completion/bash_completion

You need to source bash-completion from either /etc/bashrc or ~/.bashrc. See kubectl completion -h for more details.

$ kubectl completion -h
Output shell completion code for the specified shell (bash or zsh). The shell code must be evalutated to provide
interactive completion of kubectl commands.  This can be done by sourcing it from the .bash _profile. 

Note: this requires the bash-completion framework, which is not installed by default on Mac.  This can be installed by
using homebrew: 

  $ brew install bash-completion
  
Once installed, bash completion must be evaluated.  This can be done by adding the following line to the .bash profile 

  $ source $(brew --prefix)/etc/bash_completion
  
Note for zsh users: [1] zsh completions are only supported in versions of zsh >= 5.2

Examples:
  # Install bash completion on a Mac using homebrew
  brew install bash-completion
  printf "
  # Bash completion support
  source $(brew --prefix)/etc/bash_completion
  " >> $HOME/.bash_profile
  source $HOME/.bash_profile
  
  # Load the kubectl completion code for bash into the current shell
  source <(kubectl completion bash)
  
  # Write bash completion code to a file and source if from .bash_profile
  kubectl completion bash > ~/.kube/completion.bash.inc
  printf "
  # Kubectl shell completion
  source '$HOME/.kube/completion.bash.inc'
  " >> $HOME/.bash_profile
  source $HOME/.bash_profile
  
  # Load the kubectl completion code for zsh[1] into the current shell
  source <(kubectl completion zsh)

Usage:
  kubectl completion SHELL [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).

I had same problem on OSX with native bash:

$ kubectl  -bash: __ltrim_colon_completions: command not found

It seems like, the whole thing only works when:

• upgrade bash to ver. 4+, https://coderwall.com/p/dmuxma/upgrade-bash-on-your-mac-os
• install bash-complete@2 from brew, brew install bash-completion@2
• run kubectl completion bash > ~/.kube/kubectl_autocompletion, then source it in ~/.bash_profile

...

if [ -f /usr/local/share/bash-completion/bash_completion ]; then
  . /usr/local/share/bash-completion/bash_completion
fi

source ~/.kube/kubectl_autocompletion

above code snippet is what the final addition to my ~/.bash_profile

I had the same in Manjaro ( archlinux ), in addition to @simonxy : pacman -S bash-completion kubectl completion bash > ~/.kube/kubectl_autocompletion add to .bashrc if [ -f /usr/local/share/bash-completion/bash_completion ]; then . /usr/local/share/bash-completion/bash_completion fi source ~/.kube/kubectl_autocompletion and run source .bashrc

Btw, on macOS if you have upgraded your bash to 4+, make sure to change your shell via chsh. More info here: https://apple.stackexchange.com/a/55998/273340

Think I figured it out, I missed the part in the Examples section of the kubectl completion -h output which says to brew install bash-completion. The completion kind of works even without this, e.g. kubectl ap<TAB> gives:

$ kubectl apbash: __ltrim_colon_completions: command not found

api-versions  apply