AWS Lambda - Swift Operation not permitted - swift

Question

I am trying to compile Swift code via AWS Lambda.
Therefore I am using an Ubuntu 18.04 Image as base.
The Swift Version is 5.0.1.
When the image is executed locally, it works fine.
When I try to execute it in AWS Lambda, I get the following error:
/usr/bin/ld.gold: fatal error: /tmp/project/src/a.out: Operation not
permitted\nclang-7: error: linker command failed with exit code 1 (use
-v to see invocation)
I think that the problem is caused by the read-only aws lambda container, that only allows to write into the /tmp/ folder.
Do you know how to fix this error? It seems that swift needs permissions for folders, it doesnt have permission for?
Dockerfile
FROM ubuntu:18.04
# install clang
RUN apt-get update
RUN apt-get install -y clang
# install wget
RUN apt-get install -y wget
# install swift dependencies
RUN apt-get install -y libcurl3 libpython2.7 libpython2.7-dev
ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get install -y --no-install-recommends \
binutils \
git \
libc6-dev \
libcurl4 \
libedit2 \
libgcc-5-dev \
libpython2.7 \
libsqlite3-0 \
libstdc++-5-dev \
libxml2 \
pkg-config \
tzdata \
zlib1g-dev \
libbsd-dev
RUN apt-get install -y libicu-dev
# install swift 5.0.1
RUN wget https://swift.org/builds/swift-5.0.1-release/ubuntu1804/swift-5.0.1-RELEASE/swift-5.0.1-RELEASE-ubuntu18.04.tar.gz RUN tar xzf swift-5.0.1-RELEASE-ubuntu18.04.tar.gz RUN mv swift-5.0.1-RELEASE-ubuntu18.04 /usr/lib/swift RUN echo "export PATH=/usr/lib/swift/usr/bin:$PATH" >> ~/.bashrc
RUN . ~/.bashrc
RUN chmod -R o+r /usr/lib/swift
This is the command executed in the AWS-Lambda handler function:
swiftc hello_world.swift -o a.out
hello_world.swift
print("Hello World!")

Answer 1

Your output must be set in tmp folder
swiftc hello_world.swift -o /tmp/a.out