Dockerfile

FROM microsoft/windowsservercore

SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';"]

RUN $url = 'https://cygwin.com/setup-x86_64.exe'; \
	Write-Host ('Downloading {0} ...' -f $url); \
	Invoke-WebRequest -Uri $url -OutFile 'C:/setup-x86_64.exe'; \
	\
	Write-Host 'Installing ...'; \
	New-Item -ItemType directory -Path 'C:/tmp'; \
	Start-Process "C:/setup-x86_64.exe" -NoNewWindow -Wait -PassThru -ArgumentList @('-q','-v','-n','-B','-R','C:/cygwin64','-l','C:/tmp','-s','http://mirror.pkill.info/cygwin/','-P','default'); \
	\
	Write-Host 'Removing ...'; \
	Remove-Item -Path 'C:/tmp' -Force -Recurse -ErrorAction Ignore; \
	\
	Write-Host 'Verifying install ...'; \
	Start-Process "C:/cygwin64/bin/cygcheck.exe" -NoNewWindow -Wait -PassThru -ArgumentList @('-c'); \
	\
	Write-Host 'Complete.';

CMD ["C:/cygwin64/bin/bash.exe"]