# juju-core.bash_completion.sh: dynamic bash completion for juju 2 cmdline,

# from parsed (and cached) juju status output.

#

# Author: JuanJo Ciarlante <[email protected]>

# Copyright 2016+, Canonical Ltd.

# License: GPLv3

#

# Includes --model and --controller handling:

# juju list-models --controller <TAB>

# juju switch <TAB>

# juju status --model <TAB>

# juju ssh --model <TAB> [... will complete with proper model's units/etc ...]

#

# Print (return) cache filename for "juju status"

_JUJU_2_juju_status_cache_fname() {

local model=$(_get_current_model)

local juju_status_file=${cache_dir}/juju-status-"${model}"

_JUJU_2_cache_cmd ${_JUJU_2_cache_TTL} \

echo ${_juju_cmd_JUJU_2?} status --model "${model}" --format json

return $?

}

# Print (return) all machines

_JUJU_2_machines_from_status() {

local cache_fname=$(_JUJU_2_juju_status_cache_fname)

[ -n "${cache_fname}" ] || return 0

${_juju_cmd_PYTHON?} -c '

import json, sys

sys.stderr.close()

j = json.load(sys.stdin)

print ("\n".join(j.get("machines", {}).keys()));

' < ${cache_fname}

}

# Print (return) all units, each optionally postfixed by $2 (eg. 'myservice/0:')

_JUJU_2_units_from_status() {

local cache_fname=$(_JUJU_2_juju_status_cache_fname)

[ -n "${cache_fname}" ] || return 0

${_juju_cmd_PYTHON?} -c '

trail = "'${2}'"

import json, sys

sys.stderr.close()

j = json.load(sys.stdin)

all_units = []

for k, v in j.get("applications", {}).items():

all_units.extend(v.get("units", {}).keys())

print ("\n".join([unit + trail for unit in all_units]))

' < ${cache_fname}

}

# Print (return) all applications

_JUJU_2_applications_from_status() {

local cache_fname=$(_JUJU_2_juju_status_cache_fname)

[ -n "${cache_fname}" ] || return 0

${_juju_cmd_PYTHON?} -c '

import json, sys

sys.stderr.close()

j = json.load(sys.stdin)

print ("\n".join(j.get("applications", {}).keys()))

' < ${cache_fname}

}

# Print (return) all actions IDS from (cached) "juju show-action-status" output

_JUJU_2_action_ids_from_action_status() {

local model=$(_get_current_model)

local juju_status_file=${cache_dir}/juju-status-"${model}"

local cache_fname=$(

_JUJU_2_cache_cmd ${_JUJU_2_cache_TTL} \

echo ${_juju_cmd_JUJU_2?} show-action-status --model "${model}" --format json

) || return $?

[ -n "${cache_fname}" ] || return 0

${_juju_cmd_PYTHON?} -c '

import json, sys

sys.stderr.close()

print ("\n".join([x["id"] for x in json.load(sys.stdin).get("actions", {})]))

' < ${cache_fname}

}

# Print (return) all storage IDs from (cached) "juju list-storage" output

# Caches "juju list-storage" output, print(return) cache filename

_JUJU_2_storage_ids_from_list_storage() {

local model=$(_get_current_model)

local juju_status_file=${cache_dir}/juju-status-"${model}"

local cache_fname=$(

_JUJU_2_cache_cmd ${_JUJU_2_cache_TTL} \

echo ${_juju_cmd_JUJU_2?} list-storage --model "${model}" --format json

) || return $?

[ -n "${cache_fname}" ] || return 0

${_juju_cmd_PYTHON?} -c '

import json, sys

sys.stderr.close()

print ("\n".join(json.load(sys.stdin).get("storage", {}).keys()))

' < ${cache_fname}

}

# Print (return) both applications and units, currently used for juju status completion

_JUJU_2_applications_and_units_from_status() {

_JUJU_2_applications_from_status

_JUJU_2_units_from_status

}

# Print (return) both units and machines

_JUJU_2_units_and_machines_from_status() {

_JUJU_2_units_from_status

_JUJU_2_machines_from_status

}

# Print (return) all juju commands

_JUJU_2_list_commands() {

${_juju_cmd_JUJU_2?} help commands 2>/dev/null | awk '{print $1}'

}

# Print (return) flags for juju action

_JUJU_2_flags_for() {

[ -n "${1}" ] || return 0

${_juju_cmd_JUJU_2?} help ${1} 2>/dev/null |egrep -o -- '(^|-)-[a-z-]+'|sort -u

}

_JUJU_2_list_controllers_from_stdin() {

sed '1s/^$/{}/' |\

${_juju_cmd_PYTHON?} -c '

import json, sys

sys.stderr.close()

print ("\n".join(

json.load(sys.stdin).get("controllers", {}).keys())

)'

}

_JUJU_2_list_models_from_stdin() {

sed '1s/^$/{}/' |\

${_juju_cmd_PYTHON?} -c '

import json, sys

sys.stderr.close()

print ("\n".join(

["'$1'" + m["name"] for m in json.load(sys.stdin).get("models", {})]

))'

}

# List all controllers

_JUJU_2_list_controllers_noflags() {

_JUJU_2_cache_cmd ${_JUJU_2_cache_TTL} cat \

${_juju_cmd_JUJU_2?} list-controllers --format json | \

_JUJU_2_list_controllers_from_stdin

}

# Print:

# - list of controllers as: <controller>:<current_model>

# - list of models under current controller

_JUJU_2_list_controllers_models_noflags() {

# derive cur_controller from fully specified current model: CONTROLLER:MODEL

local cur_controller=$(_get_current_model)

cur_controller=${cur_controller%%:*}

# List all controller:models

local controllers=$(_JUJU_2_list_controllers_noflags 2>/dev/null)

[ -n "${controllers}" ] || { echo "ERROR: no valid controller found (current: ${cur_controller})" >&2; return 0 ;}

local controller=

for controller in ${controllers};do

_JUJU_2_cache_cmd ${_JUJU_2_cache_TTL} cat \

${_juju_cmd_JUJU_2?} list-models --controller ${controller} --format json |\

_JUJU_2_list_models_from_stdin "${controller}:"

# early break, specially if user hit Ctrl-C

[ $? -eq 0 ] || return 1

done

# List all models under current controller

_JUJU_2_cache_cmd ${_JUJU_2_cache_TTL} cat \

${_juju_cmd_JUJU_2?} list-models --controller ${cur_controller} --format json |\

_JUJU_2_list_models_from_stdin

}

# Print (return) guessed completion function for cmd.

# Guessing is done by parsing 1st line of juju help <cmd>,

# see case switch below.

_JUJU_2_completion_func_for_cmd() {

local action=${1} cword=${2}

# if cword==1 or action==help, use _JUJU_2_list_commands

if [ "${cword}" -eq 1 -o "${action}" = help ]; then

echo _JUJU_2_list_commands

return 0

fi

# normally prev_word is just that ...

local prev_word=${COMP_WORDS[cword-1]}

# special case for eg:

# juju ssh -m myctrl:<TAB> => COMP_WORDS[cword] is ':'

# juju ssh -m myctrl:f<TAB> => COMP_WORDS[cword-1] is ':'

[[ ${COMP_WORDS[cword]} == : ]] && prev_word=${COMP_WORDS[cword-2]}

[[ ${COMP_WORDS[cword-1]} == : ]] && prev_word=${COMP_WORDS[cword-3]}

case "${prev_word}" in

--controller|-c)

echo _JUJU_2_list_controllers_noflags; return 0;;

--model|-m)

echo _JUJU_2_list_controllers_models_noflags; return 0;;

--application)

echo _JUJU_2_applications_from_status; return 0;;

--unit)

echo _JUJU_2_units_from_status; return 0;;

--machine)

echo _JUJU_2_machines_from_status; return 0;;

esac

# parse 1st line of juju help <cmd>, to guess the completion function

# order below is important (more specific matches 1st)

case $(${_juju_cmd_JUJU_2?} help ${action} 2>/dev/null| head -1) in

# special case for ssh, scp:

*bootstrap*)

echo true ;; # help ok, existing command, no more expansion

*juju?ssh*|*juju?scp*)

echo _JUJU_2_units_and_machines_from_status;;

*\<unit*)

echo _JUJU_2_units_from_status;;

*\<service*)

echo _JUJU_2_applications_from_status;;

*\<application*)

echo _JUJU_2_applications_from_status;;

*\<machine*)

echo _JUJU_2_machines_from_status;;

*\<action*)

echo _JUJU_2_action_ids_from_action_status;;

*show-storage*)

echo _JUJU_2_storage_ids_from_list_storage;;

*pattern*|*application-or-unit*)

echo _JUJU_2_applications_and_units_from_status;; # e.g. status

*\<controller*:*\<model*|*--model*)

echo _JUJU_2_list_controllers_models_noflags;;

*\<controller?name*)

echo _JUJU_2_list_controllers_noflags;;

?*)

echo true ;; # help ok, existing command, no more expansion

*)

echo false;; # failed, not a command

esac

}

# Print (return) current model as found in the cmdline --model <...>

# else default from $JUJU_MODEL or $(juju switch)

_get_current_model() {

set +e

local model=""

if [[ ${COMP_LINE} =~ .*(--model|-m)\ ([^ ]+)\ (: [^ ]+\ )?.* ]];then

model="${BASH_REMATCH[2]}${BASH_REMATCH[3]}"

model="${model// /}"

fi

if [ -z "${model}" ];then

model=${JUJU_MODEL:-$(${_juju_cmd_JUJU_2?} switch)}

fi

echo "$model"

}

# Generic command cache function: caches cmdline output, called as:

# _JUJU_2_cache_cmd TTL ACTION cmd args ...

# TTL: cache expiration in mins

# ACTION: what to do with cached filename:

# - cat (return content)

# - echo (return cache filename, think "pointer")

_JUJU_2_cache_cmd() {

local cache_ttl="${1:?missing TTL}" # TTL in mins

local ret_action=${2:?missing what to return: "echo" or "cat"}

shift 2

local cmd="${*:?}"

local cache_dir=$HOME/.cache/juju

local cache_file=${cmd}

# replace / by _

cache_file=${cache_file//\//_}

# replace space by __

cache_file=${cache_file// /__}

# under cache_dir

cache_file=${cache_dir}/${cache_file}

local cmd_pid=

test -d ${cache_dir} || install -d ${cache_dir} -m 700

# older than TTL => remove

find "${cache_file}" -mmin +${cache_ttl} -a -size +64c -delete 2> /dev/null

# older than TTL/2 or missing => refresh in background

local cache_refresh=$((${cache_ttl}/2))

if [[ -z $(find "${cache_file}" -mmin -${cache_refresh} -a -size +64c 2> /dev/null) ]]; then

# ... create it in background (locking the .tmp to avoid many runs against same cache file

coproc flock -xn "${cache_file}".tmp \

sh -c "$cmd > ${cache_file}.tmp && mv -f ${cache_file}.tmp ${cache_file}; rm -f ${cache_file}.tmp"

fi

# if missing => wait

[ ! -s "${cache_file}" -a -n "${COPROC[0]}" ] && read -u ${COPROC[0]}

# if still missing => fail

[ ! -s "${cache_file}" ] && echo "" && return 1

# use it:

"${ret_action}" "${cache_file}"

}

# Main completion function wrap:

# calls passed completion function, also adding flags for cmd

_JUJU_2_complete_with_func() {

local action="${1}" func=${2?}

# scp is special, as we want ':' appended to unit names,

# and filename completion also.

local postfix_str= compgen_xtra=

if [[ ${action} == scp ]]; then

postfix_str=':'

compgen_xtra='-A file'

compopt -o nospace

fi

# build COMPREPLY from passed function stdout, and _JUJU_2_flags_for $action

# don't clutter with cmd flags for functions named *_noflags

local flags

case "${func}" in

*_noflags) flags="";;

*) flags=$(_JUJU_2_flags_for "${action}");;

esac

#echo "** comp=$(set|egrep ^COMP) ** func=$func **" >&2

# properly handle ':'

# see http://stackoverflow.com/questions/10528695/how-to-reset-comp-wordbreaks-without-effecting-other-completion-script

local cur="${COMP_WORDS[COMP_CWORD]}"

_get_comp_words_by_ref -n : cur

COMPREPLY=( $( compgen ${compgen_xtra} -W "$(${func} ${postfix_str}) $flags" -- ${cur} ))

__ltrim_colon_completions "$cur"

if [[ ${action} == scp ]]; then

compopt +o nospace

fi

return 0

}

# Not used here, available to the user for quick cache removal

_JUJU_2_rm_completion_cache() {

rm -fv $HOME/.cache/juju/juju-status-*

}

# main completion function entry point

_juju_complete_2() {

local action parsing_func

action="${COMP_WORDS[1]}"

COMPREPLY=()

parsing_func=$(_JUJU_2_completion_func_for_cmd "${action}" ${COMP_CWORD})

test -n "${parsing_func}" && \

_JUJU_2_complete_with_func "${action}" "${parsing_func}"

return $?

}

# _JUJU_2_cache_TTL [mins]

export _JUJU_2_cache_TTL=2

# All above completion is juju-2 specific, uses $_juju_cmd_JUJU_2

# Detect juju built from source (highest priority)

if [ -x "$GOPATH/bin/juju" ]; then

export _juju_cmd_JUJU_2="$GOPATH/bin/juju"

# Detect installed juju-2 binary (next highest priority)

elif [ -x "/usr/bin/juju-2" ]; then

export _juju_cmd_JUJU_2="/usr/bin/juju-2"

# Snap version of juju

elif [ -x "/snap/bin/juju" ]; then

export _juju_cmd_JUJU_2="/snap/bin/juju"

# Use /usr/bin/juju as a last resort.

else

export _juju_cmd_JUJU_2="/usr/bin/juju"

fi

# Select python3, else python2

export _juju_cmd_PYTHON

for _juju_cmd_PYTHON in /usr/bin/python{3,2};do

[ -x ${_juju_cmd_PYTHON?} ] && break

done

# Add juju-2 completion

complete -F _juju_complete_2 juju-2

# Also hook "juju" (without version) to make this file "self" sufficient.

#

# Note that in a normal install will be overridden later by

# /etc/bash_completion.d/juju-version which does runtime detection

# of 1.x or 2 autocompletion.

complete -F _juju_complete_2 juju

# vim: ai et sw=2 ts=2