How do I set System Path in my dockerfile for a Windows Container?

Question

I am writing a Dockerfile to create a container for OpenJDK using the new, native docker support in Windows 10. This is NOT using docker-toolbox. I would like to set the system path to include the java path, but I can't figure out how. I've tried several variations of the following file, but I can't get the path to set correctly.

FROM nanoserver:latest

RUN powershell -Command "Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force;Set-PSRepository -Name PSGallery -InstallationPolicy Trusted;Install-Module PS7Zip;" 

ADD https://github.com/ojdkbuild/ojdkbuild/releases/download/1.8.0.91-3/java-1.8.0-openjdk-1.8.0.91-3.b14.windows.x86_64.zip java.zip

RUN setx /M JRE_HOME C:\java-1.8.0-openjdk-1.8.0.91-3.b14.windows.x86_64\jre
RUN setx /M JAVA_HOME C:\java-1.8.0-openjdk-1.8.0.91-3.b14.windows.x86_64
RUN powershell -Command "Expand-7Zip java.zip"
RUN ["powershell", "$env:Path=$env:Path+\";C:\\java-1.8.0-openjdk-1.8.0.91-3.b14.windows.x86_64\\bin\""]

Answer 1

看起来这个 Golang 示例有一个粗暴的方法来做到这一点： https : //github.com/MicrosoftDocs/Virtualization-Documentation/blob/master/windows-container-samples/golang/Dockerfile#L24

Answer 2

Unfortunately, Powershell does not allow modifying the system path variable using that method. The $env:Path gives read access to the system path, not write. Which means if you change $env:Path it will only affect your current PS environment.

See this link for a way to make changes to the system path variable: http://codingbee.net/tutorials/powershell/powershell-make-a-permanent-change-to-the-path-environment-variable/