Ytdyklly

I'm using SaltStack. I would like to auto-complete the minion name when calling the salt command.

The following line has been added into ~/.bashrc:

complete -o default -o nospace -W "$(sudo ls -1 /var/cache/salt/master/minions)" salt

Then typing salt inTab → salt integration-Tab; I can see it works as expected:

$ salt integration-TabTab

integration-c   integration-u   integration-u2

To use with sudo, I have added complete -cf sudo into ~/.bashrc, but it didn't work:

sudo salt inTab

returned nothing.

I also have tried to install bash_completion and added the following lines to ~/.bash_profile:

if [ -f $(brew --prefix)/etc/bash_completion ]; then

    . $(brew --prefix)/etc/bash_completion

fi

but no luck.

Did I miss something?

Update

Oh, the first thing I would like to say is sometimes it works:

$ sudo salt integration-TabTab

integration-c   integration-u   integration-u2

and sometimes it doesn't.

So first, let's see how much your bash_completion package does.

How can I check that? Here's my function:

# a wrapper method for the next one, when the offset is unknown

_command()

{

    local offset i



    # find actual offset, as position of the first non-option

    offset=1

    for (( i=1; i <= COMP_CWORD; i++ )); do

        if [[ "${COMP_WORDS[i]}" != -* ]]; then

            offset=$i

            break

        fi

    done

    _command_offset $offset

}



# A meta-command completion function for commands like sudo(8), which need to

# first complete on a command, then complete according to that command's own

# completion definition - currently not quite foolproof (e.g. mount and umount

# don't work properly), but still quite useful.

#

_command_offset()

{

    local cur func cline cspec noglob cmd i char_offset word_offset 

        _COMMAND_FUNC _COMMAND_FUNC_ARGS



    word_offset=$1



    # rewrite current completion context before invoking

    # actual command completion



    # find new first word position, then

    # rewrite COMP_LINE and adjust COMP_POINT

    local first_word=${COMP_WORDS[$word_offset]}

    for (( i=0; i <= ${#COMP_LINE}; i++ )); do

        if [[ "${COMP_LINE:$i:${#first_word}}" == "$first_word" ]]; then

            char_offset=$i

            break

        fi

    done

    COMP_LINE=${COMP_LINE:$char_offset}

    COMP_POINT=$(( COMP_POINT - $char_offset ))



    # shift COMP_WORDS elements and adjust COMP_CWORD

    for (( i=0; i <= COMP_CWORD - $word_offset; i++ )); do

        COMP_WORDS[i]=${COMP_WORDS[i+$word_offset]}

    done

    for (( i; i <= COMP_CWORD; i++ )); do

        unset COMP_WORDS[i];

    done

    COMP_CWORD=$(( $COMP_CWORD - $word_offset ))



    COMPREPLY=()

    _get_comp_words_by_ref cur



    if [[ $COMP_CWORD -eq 0 ]]; then

        _compopt_o_filenames

        COMPREPLY=( $( compgen -c -- "$cur" ) )

    else

        cmd=${COMP_WORDS[0]}

        if complete -p ${cmd##*/} &>/dev/null; then

            cspec=$( complete -p ${cmd##*/} )

            if [ "${cspec#* -F }" != "$cspec" ]; then

                # complete -F <function>



                # get function name

                func=${cspec#*-F }

                func=${func%% *}



                if [[ ${#COMP_WORDS[@]} -ge 2 ]]; then

                    $func $cmd "${COMP_WORDS[${#COMP_WORDS[@]}-1]}" "${COMP_WORDS[${#COMP_WORDS[@]}-2]}"

                else

                    $func $cmd "${COMP_WORDS[${#COMP_WORDS[@]}-1]}"

                fi



                # remove any : generated by a command that doesn't

                # default to filenames or dirnames (e.g. sudo chown)

                # FIXME: I'm pretty sure this does not work!

                if [ "${cspec#*-o }" != "$cspec" ]; then

                    cspec=${cspec#*-o }

                    cspec=${cspec%% *}

                    if [[ "$cspec" != @(dir|file)names ]]; then

                        COMPREPLY=("${COMPREPLY[@]//\\:/:}")

                    else

                        _compopt_o_filenames

                    fi

                fi

            elif [ -n "$cspec" ]; then

                cspec=${cspec#complete};

                cspec=${cspec%%${cmd##*/}};

                COMPREPLY=( $( eval compgen "$cspec" -- "$cur" ) );

            fi

        elif [ ${#COMPREPLY[@]} -eq 0 ]; then

            _filedir

        fi

    fi

}

if you type sudo mkdirTabTab,
does it show a list of directories?

Yes:

$ sudo mkdir TabTab

.FontForge/        .djangopypi2/      .ievms/            .ssh/              .wireshark-etc/

Check set -o to see if maybe posix mode is enabled. If so, disable with set +o posix

In "posix" mode, bash's tab-completion is for some reason disabled in "vi-mode". I've not seen any explanation why this behavior is so, nor why it's specific to vi-mode, so I didn't bother explaining.

PS: This answer is more suited for someone who stumbles upon the question via a search engine... not for your particular setup.

Update:

Chet Ramey says:

in POSIX mode, the vi editing mode should not map tab to complete.
This is because POSIX.2 completely specifies the behavior of the vi
editing mode, and the standard requires tab to be mapped to self
insert by default.

Quick answer:

• Install bash-completion
  


• Source bash_completion on Bash startup


• Add your compspec on Bash startup


• Don't overwrite sudo compspec with complete -cf sudo
  

I suppose that you use MacOSX with brew.

Try:

brew update

brew install bash-completion

brew info bash-completion

# bash-completion: stable 1.3

. $(brew --prefix)/etc/bash_completion

complete -p sudo

You should see something like this:

complete -F _root_command sudo

Test:

function _comp_foo() { COMPREPLY=($(compgen -W 'a b c' -- "$2")); }

complete -F _comp_foo foo

Type foo SpaceTabTab

You should see a b c

Type sudo foo SpaceTabTab

You should see a b c

Then remove complete -fc sudo from your initialisation files (~/.bash_profile, ~/.bashrc etc)

Add the following lines to your initialisation files:

if [ -f $(brew --prefix)/etc/bash_completion ]; then

  . $(brew --prefix)/etc/bash_completion

fi



# Your compspec here

complete -o default -o nospace -W "$(sudo ls -1 /var/cache/salt/master/minions)" salt

Reopen terminal.

Type complete -p sudo.

You should see complete -F _root_command sudo.

Type complete -p salt.

You should see something like this:

complete -o default -o nospace -W 'a

b

c' salt

bash-completion2.* note:

You can install bash-completion2: https://github.com/Homebrew/homebrew/issues/19258

But:

• 
  2.* works with Bash 4.*
  


• 
  2.* uses the -D option for compspecs lazy loading. So, complete -p sudo outputs complete: sudo: no completion specification until you type sudoSpaceTab
  

sudo doesn't give you an login shell unless you ask for it with -i. So you'll find that without it you'll need to load the system's completions:

. /etc/bash_completion

If you run with -i, then $HOME will be ~root, and so anything written to the user's ~/.bashrc won't get read. If you can separate out the completion stuff from the rest of your ~/.bashrc, source that with . and that should work.