Use multi-stage build for Python

Author: StefanScherer

python/Dockerfile

@@ -1,22 +1,24 @@
+# escape=`
+FROM python:3.6-windowsservercore AS python
+
 FROM microsoft/nanoserver
 
+COPY --from=python /Python /Python
+
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
 
 ENV PYTHON_VERSION 3.6.1
 ENV PYTHON_PIP_VERSION 9.0.1
 
-RUN Invoke-WebRequest $('https://www.python.org/ftp/python/{0}/python-{0}-embed-amd64.zip' -f $env:PYTHON_VERSION) -OutFile 'python.zip' -UseBasicParsing ; \
-    Expand-Archive python.zip -DestinationPath C:\python ; \
-    $env:PATH = 'C:\python;C:\python\Scripts;{0}' -f $env:PATH ; \
-    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\' -Name Path -Value $env:PATH ; \
-    Remove-Item -Path python.zip ; \
-    mkdir $env:APPDATA\Python\Python36\site-packages ; \
-    Invoke-WebRequest 'https://bootstrap.pypa.io/get-pip.py' -OutFile 'get-pip.py' -UseBasicParsing ; \
-    $replace = ('import tempfile{0}import site{0}site.getusersitepackages()' -f [char][int]10) ; \
-    Get-Content get-pip.py | Foreach-Object { $_ -replace 'import tempfile', $replace } | Out-File -Encoding Ascii getpip.py ; \
-    $pipInstall = ('pip=={0}' -f $env:PYTHON_PIP_VERSION) ; \
-    python getpip.py $pipInstall ; \
-    Remove-Item get-pip.py ; \
+RUN $env:PATH = 'C:\Python;C:\Python\Scripts;{0}' -f $env:PATH ; `
+    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\' -Name Path -Value $env:PATH ; `
+    mkdir $env:APPDATA\Python\Python36\site-packages ; `
+    Invoke-WebRequest 'https://bootstrap.pypa.io/get-pip.py' -OutFile 'get-pip.py' -UseBasicParsing ; `
+    $replace = ('import tempfile{0}import site{0}site.getusersitepackages()' -f [char][int]10) ; `
+    Get-Content get-pip.py | Foreach-Object { $_ -replace 'import tempfile', $replace } | Out-File -Encoding Ascii getpip.py ; `
+    $pipInstall = ('pip=={0}' -f $env:PYTHON_PIP_VERSION) ; `
+    python getpip.py $pipInstall ; `
+    Remove-Item get-pip.py ; `
     Remove-Item getpip.py
 
 RUN pip install --no-cache-dir virtualenv

python/Dockerfile.build

@@ -1,7 +1,3 @@
-# docker build -t python .
+. $PSScriptRoot\..\update-docker-ce.ps1
 
-# docker rm -f pythonbuild36 2>&1
-docker pull python:3.6-windowsservercore
-docker create --name=pythonbuild36 python:3.6-windowsservercore
-docker cp pythonbuild36:Python tmp
-docker build -t python -f Dockerfile.build .
+docker build -t python .