Bootstrap App with Rancher Metadata

metadata_bootstrap.sh

#!/bin/bash -e
metadata() {
    curl -s http://rancher-metadata/latest/self/service/metadata/"$1"
}

metadata_as_java_props() {
    for md_key in $(metadata "$1"); do
        md_value="$(metadata "$1"/"$md_key")"
        if [ "$md_value" != "Not found" ]; then
            local ret="$ret-D$md_key=$md_value "
        fi
    done
    echo "$ret"
}

metadata_as_shell_vars() {
    for md_key in $(metadata "$1"); do
        md_value="$(metadata "$1"/"$md_key")"
        if [ "$md_value" != "Not found" ]; then
            export "$md_key=$md_value"
        fi
    done
}

wait_for_rancher_metadata() {
    counter=0
    printf 'Waiting for Rancher networking to use metadata service'
    until curl --output /dev/null --silent --head --fail http://rancher-metadata; do
        printf '.'
        sleep 1
        counter=$((counter + 1))
        if [ "$counter" -gt 10 ]; then
            echo
            echo "Could not reach Rancher metadata service" >&2
            exit 1
        fi
    done
    echo
}

wait_for_rancher_metadata
metadata_as_shell_vars overrides
metadata_as_java_props overrides