问题描述
每当我推入或重新登台应用程序时，我都希望从互联网上自动下载buildpack的所有组件，以确保我拥有最新版本。
I want to automatically download all components of my buildpack from the internet every time I push or re-stage my application to be assured I have the latest versions.
当前，我看到正在为
jboss buildpack :https://github.com/cloudfoundry-community/jboss-buildpack.
-----> Downloaded app package (14M)
-----> Downloaded app buildpack cache (181M)
Cloning into '/tmp/buildpacks/jboss-buildpack'...
-----> Java Buildpack Version: b96641c | https://github.com/cloudfoundry-community/jboss-buildpack#b96641c
-----> Downloading Open Jdk JRE 1.8.0_45 from https://download.run.pivotal.io/openjdk/trusty/x86_64/openjdk-1.8.0_45.tar.gz (found in cache)
推荐答案
我发现某些buildpack是用代码编写的，以避免加载过时的组件来减轻这种担忧。
I discovered that certain buildpacks are written with code to avoid loading stale components alleviating this concern.
例如：
Cloudfoundry Java buildpack ：具有内置机制，可确保始终使用最新版本的二进制文件它需要。 详细解释。
Cloudfoundry Java buildpack : https://github.com/cloudfoundry/java-buildpack has a built-in mechanism to make sure it always uses latest version of the binaries it needs. https://github.com/cloudfoundry/java-buildpack/blob/master/docs/extending-caches.md explains this in detail.
Cloudfoundry Node buildpack ：使用环境变量具有类似的功能。您可以创建一个CF环境变量： NODE_MODULES_CACHE false
，这将强制Node.js buildpack每次都会从Internet下载节点模块。
Cloudfoundry Node buildpack : https://github.com/cloudfoundry/nodejs-buildpack has similar functionality using environment variables. You can create a CF environment variable : "NODE_MODULES_CACHE false"which will force the Node.js buildpack will download node modules from the internet every time.
如果您不确定所使用的buildpack是否提供此机制，请执行以下步骤：
If you are in not sure the buildpack you are using doesn't offer this mechanism , perform following steps :
1）叉空buildpack：
1) Fork null buildpack : https://github.com/ryandotsmith/null-buildpack
2 ）将 rm -rfv $ 2 / * 添加到 null-buildpack / bin / compile 文件并提交
2) add : " rm -rfv $2/* " to null-buildpack/bin/compile file and commit
3）使用第2步中经过修改的buildpack推送您的应用程序，此步骤将完全删除缓存文件夹中的内容
3) push your application with modified buildpack from Step #2, this step will completely delete contents in cache folder
4）使用所需的build pack推送您的应用程序。
4) push your application with your desired build pack.
（参考：）
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