fakesudo is a little replacement for sudo.
Sometimes, you have to run Docker images with a particular user id (probably the current one), especially if the Docker daemon is rootfull. You cannot use the regular sudo program since this user id is not in /etc/passwd. fakesudo is the solution.
All options are silently ignored.
Do not install sudo package. Instead add the following lines in the Dockerfile (gcc is required):
COPY fakesudo.c /tmp
RUN cc -o /usr/bin/sudo /tmp/fakesudo.c && \
chmod 4755 /usr/bin/sudo && \
rm /tmp/fakesudo.cdocker build -t test .
docker run --rm -u $UID:$GID test \
sh -c 'sudo apt-get update && sudo apt-get install -qq --no-install-recommends moreutils && id | ts'