envexport

#!/bin/bash

declare -a vars=(
    AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY
    AWS_DEFAULT_REGION
    EC2_USER_ID S3_BUCKET
    EC2_PRIVATE_KEY EC2_CERT
)
declare -a vars_missing=()
declare -a files=("${EC2_CERT}" "${EC2_PRIVATE_KEY}")
declare -a files_missing
declare var
declare file

function echo_err()
{
    echo "${*}" 1>&2
}

function print_file_contents_cmd()
{
    local file_path="${1}"
    echo "cat << EOF > \"${file_path}\""
    cat "${file_path}"
    echo EOF
}

# Variable validation.
for var in ${vars[*]}
do
    if [ -z "${!var}" ]
    then
        vars_missing+=(${var})
    fi
done
if [ ${#vars_missing[*]} -gt 0 ]
then
    echo "The following variables were unset:"
    for var in ${vars_missing[*]}
    do
        echo_err "  ${var}"
    done
    exit 1
fi

# Certificate file validation.
for file in ${files[*]}
do
    if [ ! -f "${file}" ]
    then
        files_missing+=(${file})
    fi
done
if [ ${#files_missing[*]} -gt 0 ]
then
    echo "The following files were missing:"
    for var in ${files_missing[*]}
    do
        echo_err "  ${var}"
    done
    exit 1
fi

# Print commands to import a valid setup for euca2ools.
{
    for var in ${vars[*]}
    do
        echo "export ${var}=\"${!var}\"" | sed "s#${HOME}#\${HOME}#g"
    done

    echo
    if [ "$(dirname ${EC2_CERT})" = "$(dirname ${EC2_PRIVATE_KEY})" ]
    then
        echo "mkdir -p -m 0700 \"$(dirname ${EC2_CERT})\""
    else
        echo "mkdir -p -m 0700 \"$(dirname ${EC2_CERT})\" \"$(dirname ${EC2_PRIVATE_KEY})\""
    fi
    echo "touch \"${EC2_CERT}\" \"${EC2_PRIVATE_KEY}\""
    echo "chmod 0600 \"${EC2_CERT}\" \"${EC2_PRIVATE_KEY}\""

    print_file_contents_cmd "${EC2_CERT}"
    print_file_contents_cmd "${EC2_PRIVATE_KEY}"

    echo "history -c 0"
} | sed "s#${HOME}#\${HOME}#g"