gistfile1.sh

__profile_d()
{
    # i.e. __profile_d_mysql_ssl/foo/bar
    local d=$1
    [ "$d" ] || exit 0
    if [ "${d%__profile_d*}" ]; then
        echo "$d"
        exit 0
    fi
    # i.e. foo/bar
    local path=${d#*/}
    # i.e. __profile_d_mysql_ssl
    d=${d%%/*}

    local var="\${$d"
    local end="}"
    while true; do
        # Strip off the last _*
        d=${d%_*}
        # Build up variable evaluation
        var="${var}-\${$d"
        end="${end}}"
        [ "$d" = "__profile_d" ] && break # No more name spaces left
    done
    var="${var}${end}"
    [ "$path" ] && var="${var}/$path"
    eval "echo \"${var}\""
}

__eval_paths()
{
    eval "$(set | grep "^__fa_" | sed 's/^\([^=]*\)=.*/\1=$(__profile_d "$\1");/')"
}

# set/override where to find files
__profile_d=production.d/mysql

# The config vars
__fa_mysql_mycnf=__profile_d_mysql_mycnf/my.cnf
__fa_mysql_client_ssl_ca=__profile_d_mysql_ssl_ca/example.ca
__fa_mysql_client_ssl_cert=__profile_d_mysql_ssl_cert/example.cert
__fa_mysql_client_ssl_key=__profile_d_mysql_ssl_cert/example.key
__fa_mysql_client_user=root


# override just a specific set of files
__profile_d_mysql_ssl=tim.d/mysql
__profile_d_mysql_ssl_key=old.d/mysql

__eval_paths

# view vars and their values
set | grep "^__fa_"