docker

#!/bin/sh

# This script delegates docker commands to podman while transforming
# a few in order to be compatibile with docker/jenkins workflow plugin

case "$1" in
	'-v')
		# Fake docker version (workaround for workflow plugin:
		# see https://github.com/jenkinsci/docker-workflow-plugin/blob/490548c08416997ed0168c29ff3ea5f7bb06e963/src/main/java/org/jenkinsci/plugins/docker/workflow/WithContainerStep.java#L144
		# and https://github.com/jenkinsci/docker-workflow-plugin/blob/490548c08416997ed0168c29ff3ea5f7bb06e963/src/main/java/org/jenkinsci/plugins/docker/workflow/client/DockerClient.java#L247)
		echo 'Docker version 18.06.1-ce, build e68fc7a'
	;;
	run)
		# Inject oom-score-adj from host in order to run
		# within container with limited resources
		shift
		OOMSCORE=$(cat /proc/self/oom_score_adj)
		if [ "$1 $2 $3" = '-t -d -u' ]; then
			# Remove user mapping (since already mapped;
			# workflow plugin workaround, see https://github.com/jenkinsci/docker-workflow-plugin/blob/490548c08416997ed0168c29ff3ea5f7bb06e963/src/main/java/org/jenkinsci/plugins/docker/workflow/client/DockerClient.java#L344)
			shift 4
			exec /usr/local/bin/podman run -t -d --oom-score-adj "$OOMSCORE" "$@"
		else
			exec /usr/local/bin/podman run --oom-score-adj "$OOMSCORE" "$@"
		fi
	;;
	inspect)
		# Convert {{.Image}} to {{.ImageID}} (workaround for docker compatibility / workflow plugin:
		# see https://github.com/jenkinsci/docker-workflow-plugin/blob/490548c08416997ed0168c29ff3ea5f7bb06e963/src/main/java/org/jenkinsci/plugins/docker/workflow/client/DockerClient.java#L344;
		# also podman ignores errors: https://github.com/containers/libpod/pull/2181)
		shift
		if [ "$1" = '-f' -a "$2" = '{{.Image}}' ]; then
			shift 2
			exec /usr/local/bin/podman inspect -f '{{.ImageID}}' "$@"
		else
			exec /usr/local/bin/podman inspect "$@"
		fi
	;;
	top)
		# Convert ps format option (workaround for docker compatibility / workflow plugin:
		# see https://github.com/jenkinsci/docker-workflow-plugin/blob/490548c08416997ed0168c29ff3ea5f7bb06e963/src/main/java/org/jenkinsci/plugins/docker/workflow/client/DockerClient.java#L140)
		shift
		if [ "$2" = '-eo' ]; then
			CONTAINERID="$1"
			shift 2
			exec /usr/local/bin/podman top "$CONTAINERID" $(echo "$@" | sed -E 's/,/ /g')
		else
			exec /usr/local/bin/podman top "$@"
		fi
	;;
	*)
		exec /usr/local/bin/podman "$@"
	;;
esac