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#!/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 [ -e $(dirname "$0")/importenv ]; then
# with boot2docker, importenv is not in the PATH but it is in the same folder
IMPORTENV=$(dirname "$0")/importenv
else
IMPORTENV=importenv
fi
if [ -z "$1" ]; then
echo "Usage: `basename "$0"` CONTAINER [COMMAND [ARG]...]"
echo ""
echo "Enters the Docker CONTAINER and executes the specified COMMAND."
echo "If COMMAND is not specified, runs an interactive shell in CONTAINER."
exit
fi
PID=$(docker inspect --format "{{.State.Pid}}" "$1")
[ -z "$PID" ] && exit 1
shift
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 $USER." >&2
fi
fi
ENVIRON="/proc/$PID/environ"
# Prepare nsenter flags
OPTS="--target $PID --mount --uts --ipc --net --pid --"
# env is to clear all host environment variables and set then anew
if [ $# -lt 1 ]; then
# No arguments, default to `su` which executes the default login shell
$LAZY_SUDO "$IMPORTENV" "$ENVIRON" "$NSENTER" $OPTS su -m root
else
# Has command
# "$@" is magic in bash, and needs to be in the invocation
$LAZY_SUDO "$IMPORTENV" "$ENVIRON" "$NSENTER" $OPTS "$@"
fi