run legacy capifony using docker, works on osx and linux

capifony.sh

#!/bin/bash
IMAGE="mjanser/capifony"
CURRDIR=$(pwd)

if [ "$(uname)" == "Darwin" ]; then

    # under Mac OS X platform
    command -v jq >/dev/null 2>&1 || { echo >&2 "please install jq with \"brew install jq\" or \"port install jq\""; exit 1; }
    docker pull $IMAGE
    ENTRYPOINT=$(docker inspect $IMAGE | jq -r '.[0].ContainerConfig.Entrypoint[0]')
    WORKINGDIR=$(docker inspect $IMAGE | jq -r '.[0].Config.WorkingDir')
    cat > $CURRDIR/tmp-entrypoint.sh <<EOF
#!/bin/bash
eval \`ssh-agent\`
ssh-add
$ENTRYPOINT \$@
EOF
    docker run --rm -it --entrypoint "/bin/bash" -v $CURRDIR:$WORKINGDIR -v ~/.ssh/known_hosts:/root/.ssh/known_hosts -v ~/.ssh/id_rsa:/root/.ssh/id_rsa $IMAGE $WORKINGDIR/tmp-entrypoint.sh $@
    rm $CURRDIR/tmp-entrypoint.sh

elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then

    # under GNU/Linux platform
    docker run --rm -it -v $CURRDIR:$WORKINGDIR -v $(readlink -f $SSH_AUTH_SOCK):/root/ssh-agent -v ~/.ssh/known_hosts:/root/.ssh/known_hosts $@

fi