笔记：Docker命令自动补全

笔记：Docker命令自动补全

一 背景

作为一名 Linux 重度用户，每次敲命令总会情不自禁地按下 Tab 键。在键入 Docker 命令时也会出现类似的习惯性动作。那么是否 Docker
相关命令也能自动补全呢？

二 操作步骤

2.1 安装 bash-completion
sudo yum install -y bash-completion
安装完成之后重启系统或者重新登录 shell。如果安装成功。键入 docker p 后，再 Tab 键，系统显示如下：
pause plugin port ps pull push
此时，我们运行例如 docker run 之类的命令，键入镜像的首字母，镜像名称依然无法自动补全。

2.2 根据 Docker 官方文档进一步配置
sudo curl -L
https://raw.githubusercontent.com/docker/compose/1.24.1/contrib/completion/bash/docker-compose
-o /etc/bash_completion.d/docker-compose source
/etc/bash_completion.d/docker-compose
/etc/bash_completion.d/docker-compose内容如下：
#!/bin/bash # # bash completion for docker-compose # # This work is based on
the completion for the docker command. # # This script provides completion of:
# - commands and their options # - service names # - filepaths # # To enable
the completions either: # - place this file in /etc/bash_completion.d # or # -
copy this file to e.g. ~/.docker-compose-completion.sh and add the line # below
to your .bashrc after bash completion features are loaded # .
~/.docker-compose-completion.sh
__docker_compose_previous_extglob_setting=$(shopt -p extglob) shopt -s extglob
__docker_compose_q() { docker-compose 2>/dev/null "${top_level_options[@]}"
"$@" } # Transforms a multiline list of strings into a single line string #
with the words separated by "|". __docker_compose_to_alternatives() { local
parts=( $1 ) local IFS='|' echo "${parts[*]}" } # Transforms a multiline list
of options into an extglob pattern # suitable for use in case statements.
__docker_compose_to_extglob() { local extglob=$(
__docker_compose_to_alternatives "$1" ) echo "@($extglob)" } # Determines
whether the option passed as the first argument exist on # the commandline. The
option may be a pattern, e.g. `--force|-f`. __docker_compose_has_option() {
local pattern="$1" for (( i=2; i < $cword; ++i)); do if [[ ${words[$i]} =~
^($pattern)$ ]] ; then return 0 fi done return 1 } # Returns `key` if we are
currently completing the value of a map option (`key=value`) # which matches
the extglob passed in as an argument. # This function is needed for
key-specific completions. __docker_compose_map_key_of_current_option() { local
glob="$1" local key glob_pos if [ "$cur" = "=" ] ; then # key= case key="$prev"
glob_pos=$((cword - 2)) elif [[ $cur == *=* ]] ; then # key=value case (OSX)
key=${cur%=*} glob_pos=$((cword - 1)) elif [ "$prev" = "=" ] ; then
key=${words[$cword - 2]} # key=value case glob_pos=$((cword - 3)) else return
fi [ "${words[$glob_pos]}" = "=" ] && ((glob_pos--)) # --option=key=value
syntax [[ ${words[$glob_pos]} == @($glob) ]] && echo "$key" } # suppress
trailing whitespace __docker_compose_nospace() { # compopt is not available in
ancient bash versions type compopt &>/dev/null && compopt -o nospace } #
Outputs a list of all defined services, regardless of their running state. #
Arguments for `docker-compose ps` may be passed in order to filter the service
list, # e.g. `status=running`. __docker_compose_services() { __docker_compose_q
ps --services "$@" } # Applies completion of services based on the current
value of `$cur`. # Arguments for `docker-compose ps` may be passed in order to
filter the service list, # see `__docker_compose_services`.
__docker_compose_complete_services() { COMPREPLY=( $(compgen -W
"$(__docker_compose_services "$@")" -- "$cur") ) } # The services for which at
least one running container exists __docker_compose_complete_running_services()
{ local names=$(__docker_compose_services --filter status=running) COMPREPLY=(
$(compgen -W "$names" -- "$cur") ) } _docker_compose_build() { case "$prev" in
--build-arg) COMPREPLY=( $( compgen -e -- "$cur" ) ) __docker_compose_nospace
return ;; esac case "$cur" in -*) COMPREPLY=( $( compgen -W "--build-arg
--compress --force-rm --help --memory --no-cache --pull --parallel" -- "$cur" )
) ;; *) __docker_compose_complete_services --filter source=build ;; esac }
_docker_compose_bundle() { case "$prev" in --output|-o) _filedir return ;; esac
COMPREPLY=( $( compgen -W "--push-images --help --output -o" -- "$cur" ) ) }
_docker_compose_config() { case "$prev" in --hash) if [[ $cur == \\* ]] ; then
COMPREPLY=( '\*' ) else COMPREPLY=( $(compgen -W "$(__docker_compose_services)
\\\* " -- "$cur") ) fi return ;; esac COMPREPLY=( $( compgen -W "--hash --help
--quiet -q --resolve-image-digests --services --volumes" -- "$cur" ) ) }
_docker_compose_create() { case "$cur" in -*) COMPREPLY=( $( compgen -W
"--build --force-recreate --help --no-build --no-recreate" -- "$cur" ) ) ;; *)
__docker_compose_complete_services ;; esac } _docker_compose_docker_compose() {
case "$prev" in --tlscacert|--tlscert|--tlskey) _filedir return ;; --file|-f)
_filedir "y?(a)ml" return ;; --log-level) COMPREPLY=( $( compgen -W "debug info
warning error critical" -- "$cur" ) ) return ;; --project-directory) _filedir
-d return ;; $(__docker_compose_to_extglob "$daemon_options_with_args") )
return ;; esac case "$cur" in -*) COMPREPLY=( $( compgen -W
"$daemon_boolean_options $daemon_options_with_args $top_level_options_with_args
--help -h --no-ansi --verbose --version -v" -- "$cur" ) ) ;; *) COMPREPLY=( $(
compgen -W "${commands[*]}" -- "$cur" ) ) ;; esac } _docker_compose_down() {
case "$prev" in --rmi) COMPREPLY=( $( compgen -W "all local" -- "$cur" ) )
return ;; --timeout|-t) return ;; esac case "$cur" in -*) COMPREPLY=( $(
compgen -W "--help --rmi --timeout -t --volumes -v --remove-orphans" -- "$cur"
) ) ;; esac } _docker_compose_events() { case "$prev" in --json) return ;; esac
case "$cur" in -*) COMPREPLY=( $( compgen -W "--help --json" -- "$cur" ) ) ;;
*) __docker_compose_complete_services ;; esac } _docker_compose_exec() { case
"$prev" in --index|--user|-u|--workdir|-w) return ;; esac case "$cur" in -*)
COMPREPLY=( $( compgen -W "-d --detach --help --index --privileged -T --user -u
--workdir -w" -- "$cur" ) ) ;; *) __docker_compose_complete_running_services ;;
esac } _docker_compose_help() { COMPREPLY=( $( compgen -W "${commands[*]}" --
"$cur" ) ) } _docker_compose_images() { case "$cur" in -*) COMPREPLY=( $(
compgen -W "--help --quiet -q" -- "$cur" ) ) ;; *)
__docker_compose_complete_services ;; esac } _docker_compose_kill() { case
"$prev" in -s) COMPREPLY=( $( compgen -W "SIGHUP SIGINT SIGKILL SIGUSR1
SIGUSR2" -- "$(echo $cur | tr '[:lower:]' '[:upper:]')" ) ) return ;; esac case
"$cur" in -*) COMPREPLY=( $( compgen -W "--help -s" -- "$cur" ) ) ;; *)
__docker_compose_complete_running_services ;; esac } _docker_compose_logs() {
case "$prev" in --tail) return ;; esac case "$cur" in -*) COMPREPLY=( $(
compgen -W "--follow -f --help --no-color --tail --timestamps -t" -- "$cur" ) )
;; *) __docker_compose_complete_services ;; esac } _docker_compose_pause() {
case "$cur" in -*) COMPREPLY=( $( compgen -W "--help" -- "$cur" ) ) ;; *)
__docker_compose_complete_running_services ;; esac } _docker_compose_port() {
case "$prev" in --protocol) COMPREPLY=( $( compgen -W "tcp udp" -- "$cur" ) )
return; ;; --index) return; ;; esac case "$cur" in -*) COMPREPLY=( $( compgen
-W "--help --index --protocol" -- "$cur" ) ) ;; *)
__docker_compose_complete_services ;; esac } _docker_compose_ps() { local
key=$(__docker_compose_map_key_of_current_option '--filter') case "$key" in
source) COMPREPLY=( $( compgen -W "build image" -- "${cur##*=}" ) ) return ;;
status) COMPREPLY=( $( compgen -W "paused restarting running stopped" --
"${cur##*=}" ) ) return ;; esac case "$prev" in --filter) COMPREPLY=( $(
compgen -W "source status" -S "=" -- "$cur" ) ) __docker_compose_nospace
return; ;; esac case "$cur" in -*) COMPREPLY=( $( compgen -W "--all -a --filter
--help --quiet -q --services" -- "$cur" ) ) ;; *)
__docker_compose_complete_services ;; esac } _docker_compose_pull() { case
"$cur" in -*) COMPREPLY=( $( compgen -W "--help --ignore-pull-failures
--include-deps --no-parallel --quiet -q" -- "$cur" ) ) ;; *)
__docker_compose_complete_services --filter source=image ;; esac }
_docker_compose_push() { case "$cur" in -*) COMPREPLY=( $( compgen -W "--help
--ignore-push-failures" -- "$cur" ) ) ;; *) __docker_compose_complete_services
;; esac } _docker_compose_restart() { case "$prev" in --timeout|-t) return ;;
esac case "$cur" in -*) COMPREPLY=( $( compgen -W "--help --timeout -t" --
"$cur" ) ) ;; *) __docker_compose_complete_running_services ;; esac }
_docker_compose_rm() { case "$cur" in -*) COMPREPLY=( $( compgen -W "--force -f
--help --stop -s -v" -- "$cur" ) ) ;; *) if __docker_compose_has_option
"--stop|-s" ; then __docker_compose_complete_services else
__docker_compose_complete_services --filter status=stopped fi ;; esac }
_docker_compose_run() { case "$prev" in -e) COMPREPLY=( $( compgen -e -- "$cur"
) ) __docker_compose_nospace return ;;
--entrypoint|--label|-l|--name|--user|-u|--volume|-v|--workdir|-w) return ;;
esac case "$cur" in -*) COMPREPLY=( $( compgen -W "--detach -d --entrypoint -e
--help --label -l --name --no-deps --publish -p --rm --service-ports -T
--use-aliases --user -u --volume -v --workdir -w" -- "$cur" ) ) ;; *)
__docker_compose_complete_services ;; esac } _docker_compose_scale() { case
"$prev" in =) COMPREPLY=("$cur") return ;; --timeout|-t) return ;; esac case
"$cur" in -*) COMPREPLY=( $( compgen -W "--help --timeout -t" -- "$cur" ) ) ;;
*) COMPREPLY=( $(compgen -S "=" -W "$(__docker_compose_services)" -- "$cur") )
__docker_compose_nospace ;; esac } _docker_compose_start() { case "$cur" in -*)
COMPREPLY=( $( compgen -W "--help" -- "$cur" ) ) ;; *)
__docker_compose_complete_services --filter status=stopped ;; esac }
_docker_compose_stop() { case "$prev" in --timeout|-t) return ;; esac case
"$cur" in -*) COMPREPLY=( $( compgen -W "--help --timeout -t" -- "$cur" ) ) ;;
*) __docker_compose_complete_running_services ;; esac } _docker_compose_top() {
case "$cur" in -*) COMPREPLY=( $( compgen -W "--help" -- "$cur" ) ) ;; *)
__docker_compose_complete_running_services ;; esac } _docker_compose_unpause()
{ case "$cur" in -*) COMPREPLY=( $( compgen -W "--help" -- "$cur" ) ) ;; *)
__docker_compose_complete_services --filter status=paused ;; esac }
_docker_compose_up() { case "$prev" in =) COMPREPLY=("$cur") return ;;
--exit-code-from) __docker_compose_complete_services return ;; --scale)
COMPREPLY=( $(compgen -S "=" -W "$(__docker_compose_services)" -- "$cur") )
__docker_compose_nospace return ;; --timeout|-t) return ;; esac case "$cur" in
-*) COMPREPLY=( $( compgen -W "--abort-on-container-exit --always-recreate-deps
--build -d --detach --exit-code-from --force-recreate --help --no-build
--no-color --no-deps --no-recreate --no-start --renew-anon-volumes -V
--remove-orphans --scale --timeout -t" -- "$cur" ) ) ;; *)
__docker_compose_complete_services ;; esac } _docker_compose_version() { case
"$cur" in -*) COMPREPLY=( $( compgen -W "--short" -- "$cur" ) ) ;; esac }
_docker_compose() { local previous_extglob_setting=$(shopt -p extglob) shopt -s
extglob local commands=( build bundle config create down events exec help
images kill logs pause port ps pull push restart rm run scale start stop top
unpause up version ) # Options for the docker daemon that have to be passed to
secondary calls to # docker-compose executed by this script. local
daemon_boolean_options=" --skip-hostname-check --tls --tlsverify " local
daemon_options_with_args=" --file -f --host -H --project-directory
--project-name -p --tlscacert --tlscert --tlskey " # These options are require
special treatment when searching the command. local
top_level_options_with_args=" --log-level " COMPREPLY=() local cur prev words
cword _get_comp_words_by_ref -n : cur prev words cword # search subcommand and
invoke its handler. # special treatment of some top-level options local
command='docker_compose' local top_level_options=() local counter=1 while [
$counter -lt $cword ]; do case "${words[$counter]}" in
$(__docker_compose_to_extglob "$daemon_boolean_options") ) local
opt=${words[counter]} top_level_options+=($opt) ;;
$(__docker_compose_to_extglob "$daemon_options_with_args") ) local
opt=${words[counter]} local arg=${words[++counter]} top_level_options+=($opt
$arg) ;; $(__docker_compose_to_extglob "$top_level_options_with_args") ) ((
counter++ )) ;; -*) ;; *) command="${words[$counter]}" break ;; esac ((
counter++ )) done local completions_func=_docker_compose_${command//-/_}
declare -F $completions_func >/dev/null && $completions_func eval
"$previous_extglob_setting" return 0 } eval
"$__docker_compose_previous_extglob_setting" unset
__docker_compose_previous_extglob_setting complete -F _docker_compose
docker-compose docker-compose.exe
至此，所有补全功能相关的准备工作完成！执行 docker run 类似的命令时，镜像名称及 tag 均能自动补全了。

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