sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

[sbarillet]

Hello,
I try to slim one of my container based on UBUNTU:18.04,
I've a x30 minify performance that is really great but I've a sudo command issue which I can't get rid of.
In my Dockerfile, I've an 'apt-get install sudo' command in a bash script called by the ENTRYPOINT
and I need it to load a driver at container start-up due to a USER switch.
The bash file contains this line: sudo /etc/init.d/<cmd> start
When I check the docker logs stdout, I've the following issue:
sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set
I tried to escalade the issue, using docker exec command in root mode, and I checked the file permission that should be 4755.
docker exec --user root -it 01 bash
bash-4.4# stat -c "%a" /usr/bin/sudo
755
In the container execution (docker exec --user root -it bash), I was able to change the sudo file permission (chmod 4755 /usr/bin/sudo) and after that, if I re execute the container the current user, I was able to execute the sudo command.
So, I think that my issue is related to a file permission.

Here is the docker-slim build command I used, but It doesn't fix the sudo permission issue:

docker-slim build --include-shell \ --include-exe='/bin/chmod' \ --include-exe='/bin/chown' \ --include-exe='/usr/bin/stat' \ --include-path='/usr/bin/sudo:4755' \ --include-path='/usr/lib' \ --include-path='/usr/tmp' \ --include-path='/var/tmp' \ my_container:ubuntu

I've also tried with others switch such as --path-perms-file='/usr/bin/sudo:4755' but with no luck.
Any idea to apply to resolve this issue ? Thanks.

[kcq]

@xlz-sbarillet might be good to try setting the user (and potentially group) ID on /usr/bin/sudo to 0 like this: --include-path='/usr/bin/sudo:4755#0#0' You can find a bit more about it here: https://github.com/docker-slim/docker-slim#what-if-my-docker-images-uses-the-user-command