distrobox-enter

#!/bin/sh
# POSIX
# Expected env variables:
#	HOME
#	USER
#	SHELL

trap '[ "$?" -ne 0 ] && echo An error occurred' EXIT

# We depend on podman let's be sure we have it
if ! command -v podman >/dev/null; then
	echo "Missing dependency: podman"
	exit 127
fi

# Defaults
verbose=0
container_name="fedora-toolbox-35"
container_command="${SHELL} -l"

# Print usage to stdout.
# Arguments:
#   None
# Outputs:
#   print usage with examples.
show_help() {
	echo "USAGE:
	distrobox-enter --name fedora-toolbox-35 -- bash -l

	Arguments:
		--name/-n:		name for the distrobox			default: fedora-toolbox-35
		--/-e:			end arguments execute the rest as command to execute at login		default: bash -l
		--help/-h:		show this message
		-v:			show more verbosity
	"
}

# Parse arguments
while :; do
	case $1 in
	-h | --help)
		# Call a "show_help" function to display a synopsis, then exit.
		show_help
		exit
		;;
	-v)
		shift
		verbose=1
		;;
	-n | --name)
		if [ -n "$2" ]; then
			container_name="$2"
			shift
			shift
		fi
		;;
	-e | --exec | --)
		shift
		container_command=$*
		break
		;;
	*) # Default case: If no more options then break out of the loop.
		break ;;
	esac
done

set -o errexit
set -o nounset
# set verbosity
if [ "${verbose}" -ne 0 ]; then
	set -o xtrace
fi

# Generate Podman command to execute.
# Arguments:
#   None
# Outputs:
#   prints the podman command to enter the distrobox container
generate_command() {
	# If the container is not already running, we need to start if first
	if ! podman ps | grep -q "${container_name}$"; then
		# if container is not running, start it first
		if ! podman start "${container_name}" >/dev/null; then

			# if cannot start, container not found!
			# prompt to create it first
			echo "" 1>&2
			echo "Cannot start container, does it exist?" 1>&2
			echo "Try running first:" 1>&2
			echo "" 1>&2
			echo "    distrobox-create --name <name-of-container> --image <remote>/<docker>:<tag>" 1>&2
			exit 1
		else
			echo >&2 "Starting container"
			echo >&2 "run this command to follow along:"
			echo >&2 "	podman logs -f ${container_name}"
			while ! podman logs "${container_name}" 2>/dev/null | grep -q "container_setup_done"; do
				printf >&2 "."
				sleep 1
			done
			echo >&2 "done!"
		fi
	fi

	# entering container using our user and workdir
	echo "podman exec --interactive --tty --user=${USER} --workdir=${HOME}"
	echo "--env=DISTROBOX_ENTER_PATH=$(command -v distrobox-enter)"
	# exporting current environment to container
	for i in $(printenv | grep '=' | head -n -2); do
		echo "--env=$i"
	done
	# run selected pod with command+args
	echo "${container_name} ${container_command}"
}

# Generate the command and execute
$(generate_command)