These images are currently the smallest possible to run a swift app on. To run the a compiled app on this image it
must be compiled with the flags -Xswiftc -static-stdlib to statically link Swift Core to the image. In addition to
this the shared object such as libFoundation.so must be copied from a compatible ubuntu installation. In the ibmcom/kitura-ubuntu
image these libraries reside at the path /usr/lib/swift/linux/*.so.
To compile your application you can use the following snippet which can be added to a Makefile.
BUILD_COMMAND=swift build -c release
STATIC_BUILD_COMMAND=${BUILD_COMMAND} -Xswiftc -static-stdlib
build:
${BUILD_COMMAND}
build_release:
${RELEASE_BUILD_COMMAND}
build_linux_small:
docker run -it --rm -v $(shell pwd):/src -w /src ibmcom/kitura-ubuntu ${STATIC_BUILD_COMMAND} -Xlinker -L/usr/lib/swift/linux
docker run -it --rm -v $(shell pwd):/src -w /src ibmcom/kitura-ubuntu /bin/bash -c "cp /usr/lib/swift/linux/*.so /src/linux"