Dockerコンテナにnsenterを使って入るんだけどコンテナIDを指定しなくていい手抜きスクリプト

docker-nsenter

#!/bin/sh

declare container_id=$1

DOCKER_PS=` \
    docker ps \
        | awk '\
            BEGIN{L=1} \
            !/^CONTAINER/{printf("<%d> %s\n", L, $0); L++;} \
            /^CONTAINER/{print;} \
        ' \
    `
if [ -z "$container_id" ]; then
    echo -e "Usage: docker-nsenter [container_id||line_number]\n" >&2
    echo "$DOCKER_PS"
    echo -e "\n"
    exit 1
fi

echo "$container_id" \
    | grep -q '^[0-9][0-9]*$' \
    && [ `expr $container_id + 0` -ge 1 ] \
    && container_id=`\
        echo "$DOCKER_PS" \
        | grep "^<$container_id>" \
        | cut -b 5-16 \
    `

/opt/lib/util-linux-2.24.2/bin/nsenter \
    --mount \
    --uts \
    --ipc \
    --net \
    --pid \
    --target \
    $(docker inspect --format "{{.State.Pid}}" $container_id)