Docker/Podman

Parse lines from an arguments file to separate parameters for building

From here

podman build -t foo \
  $(while IFS= read -r line; do args+="--build-arg ${line} "; \above
  done < <(cat .arg); \
echo "$args"; unset args) .

Remove all ‘exited’ containers

podman rm $(podman ps --all -q -f status=exited)

Build and run container based on Dockerfile in current context

podman build -t foo . && podman run --rm -it foo

Prune everything that shouldn’t exist anymore without any confirmation

podman system prune -a -f

Remove all images except latest

podman images | grep -v "latest" | tail -n +2 | awk '{ print $3 }' | xargs --no-run-if-empty podman rmi

Possible improvement when executing RUN within a Dockerfile

Benefit is that when a specific line fails, then the error message is much more concise as opposed to the standard method of using ampersands.

RUN set -eu; \
    python3 -m venv venv; \
    venv/bin/pip install -r requirements.txt; \
    venv/bin/pip install -r requirements-dev.txt; \
    echo 'Venv creation + requirements installation: OK';

Remove dangling <none>:<none> images

docker rmi $(docker images -f "dangling=true" -q)