docker-enter

docker-enter

#!/bin/sh

if [ -e $(dirname "$0")/nsenter ]; then
    # with boot2docker, nsenter is not in the PATH but it is in the same folder
    NSENTER=$(dirname "$0")/nsenter
else
    NSENTER=nsenter
fi

if [ -z "$1" ]; then
    echo "Usage: `basename "$0"` CONTAINER [COMMAND [ARG]...]"
    echo ""
    echo "Enters the Docker CONTAINER and executes the specified COMMAND."
    echo "If COMMAND is not specified, runs an interactive shell in CONTAINER."
else
    PID=$(docker inspect --format "{{.State.Pid}}" "$1")
    if [ -z "$PID" ]; then
        exit 1
    fi
    shift

    OPTS="--target $PID --mount --uts --ipc --net --pid --"

    if [ "$(id -u)" -ne "0" ]; then
        which sudo > /dev/null
        if [ "$?" -eq "0" ]; then
          LAZY_SUDO="sudo "
        else
          echo "Warning: Cannot find sudo; Invoking nsenter as the user $USER." >&2
        fi
    fi

    if [ -z "$1" ]; then
        # No command given.
        # Use su to clear all host environment variables except for TERM,
        # initialize the environment variables HOME, SHELL, USER, LOGNAME, PATH,
        # and start a login shell.
        $LAZY_SUDO "$NSENTER" $OPTS su - root
    else
        # Use env to clear all host environment variables.
        $LAZY_SUDO "$NSENTER" $OPTS env --ignore-environment -- "$@"
    fi
fi