Dockerイメージを対話的に削除する

気がつくと古いDockerイメージがたまってくるので、対話的に削除するシェルスクリプトを作成。docker image pruneまたはdocker system pruneと合わせて使うと便利かもしれない。

#/bin/bash

for image_str in $(docker images --format "{{.Repository}}:{{.Tag}}_{{.ID}}")
do
  while true
  do
    id=${image_str#*_}
    image=${image_str%_*}
    tag=${image##*:}
    read -p "${image}    delete? (y/n/a):" yn
    case $yn in
      [yY]*)
        if [ ${tag} = "<none>" ]; then
          docker rmi ${id}
        else
          docker rmi ${image}
        fi
        echo "deleted"; echo ""; break ;;
      [nN]*)
        echo "not deleted"; echo ""; break ;;
      [aA]*)
        echo "abort"; echo ""; exit ;;
    esac
  done
done

実行例

$ ./docker-image-cleaner.sh
sotoiwa540/qiita-checker:1.1    delete? (y/n/a):n
not deleted

python:3-alpine    delete? (y/n/a):n
not deleted

python:3    delete? (y/n/a):n
not deleted

websphere-liberty:18.0.0.4-kernel    delete? (y/n/a):n
not deleted

sotoiwa540/qiita-checker:<none>    delete? (y/n/a):y
Untagged: sotoiwa540/qiita-checker@sha256:d63ae4540f58c350193c8c636068e4caf72e00feb779fc626f6fd0adfbd98286
Deleted: sha256:2dfc9b8592bba73fc50ae4217df19e4e89b272c50f32b7491d03a9febc17e3ec
Deleted: sha256:17e767783cad1be9e2c81baf4e073cab51737c93503326114a7cfcf3cab68c11
Deleted: sha256:271a6c0d66359aec911a079c67039f5c79568e5c65a2d4a4d592ed212113fab9
Deleted: sha256:9ed64b9fca76020a3eb153a27a66088a38d4174d05ad4425ff7e79b9be1992f9
Deleted: sha256:8a46f8cc49d88d47db4cade46c82ab962da5a027e5e41702936e258b6c1a686d
deleted

busybox:latest    delete? (y/n/a):y
Untagged: busybox:latest
Untagged: busybox@sha256:7964ad52e396a6e045c39b5a44438424ac52e12e4d5a25d94895f2058cb863a0
Deleted: sha256:3a093384ac306cbac30b67f1585e12b30ab1a899374dabc3170b9bca246f1444
Deleted: sha256:683f499823be212bf04cb9540407d8353803c25d0d9eb5f2fdb62786d8b95ead
deleted

$