distrobox-list

#!/bin/sh
# SPDX-License-Identifier: GPL-3.0-only
#
# This file is part of the distrobox project:
#    https://github.com/89luca89/distrobox
#
# Copyright (C) 2021 distrobox contributors
#
# distrobox is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3
# as published by the Free Software Foundation.
#
# distrobox is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with distrobox; if not, see <http://www.gnu.org/licenses/>.

# POSIX
# Optional env variables:
#	DBX_CONTAINER_MANAGER
#	DBX_SUDO_PROGRAM

# Despite of running this script via SUDO/DOAS being not supported (the
# script itself will call the appropriate tool when necessary), we still want
# to allow people to run it as root, logged in in a shell, and create rootful
# containers.
#
# SUDO_USER is a variable set by SUDO and can be used to check whether the script was called by it. Same thing for DOAS_USER, set by DOAS.
if [ -n "${SUDO_USER}" ] || [ -n "${DOAS_USER}" ]; then
	printf >&2 "Running %s via SUDO/DOAS is not supported. Instead, please try running:\n" "$(basename "${0}")"
	printf >&2 "  %s --root %s\n" "$(basename "${0}")" "$*"
	exit 1
fi

# Defaults
no_color=0
# If the user runs this script as root in a login shell, set rootful=1.
# There's no need for them to pass the --root flag option in such cases.
[ "$(id -ru)" -eq 0 ] && rootful=1 || rootful=0
verbose=0
version="1.5.0.2"
container_manager="autodetect"

# Source configuration files, this is done in an hierarchy so local files have
# priority over system defaults
# leave priority to environment variables.
config_files="
	/usr/share/distrobox/distrobox.conf
	/usr/share/defaults/distrobox/distrobox.conf
	/usr/etc/distrobox/distrobox.conf
	/usr/local/share/distrobox/distrobox.conf
	/etc/distrobox/distrobox.conf
	${XDG_CONFIG_HOME:-"${HOME}/.config"}/distrobox/distrobox.conf
	${HOME}/.distroboxrc
"
for config_file in ${config_files}; do
	# Shellcheck will give error for sourcing a variable file as it cannot follow
	# it. We don't care so let's disable this linting for now.
	# shellcheck disable=SC1090
	[ -e "${config_file}" ] && . "${config_file}"
done
# If we're running this script as root -- as in logged in in the shell as root
# user, and not via SUDO/DOAS --, we don't need to set distrobox_sudo_program
# as it's meaningless for this use case.
if [ "$(id -ru)" -ne 0 ]; then
	# If the DBX_SUDO_PROGRAM/distrobox_sudo_program variable was set by the
	# user, use its value instead of "sudo". But only if not running the script
	# as root (UID 0).
	distrobox_sudo_program=${DBX_SUDO_PROGRAM:-${distrobox_sudo_program:-"sudo"}}
fi
[ -n "${DBX_CONTAINER_MANAGER}" ] && container_manager="${DBX_CONTAINER_MANAGER}"

# Print usage to stdout.
# Arguments:
#   None
# Outputs:
#   print usage with examples.
show_help() {
	cat << EOF
distrobox version: ${version}

Usage:

	distrobox-list

Options:

	--help/-h:		show this message
	--no-color:		disable color formatting
	--root/-r:		launch podman/docker with root privileges. Note that if you need root this is the preferred
				way over "sudo distrobox" (note: if using a program other than 'sudo' for root privileges is necessary,
				specify it through the DBX_SUDO_PROGRAM env variable, or 'distrobox_sudo_program' config variable)
	--verbose/-v:		show more verbosity
	--version/-V:		show version
EOF
}

# Parse arguments
while :; do
	case $1 in
		-h | --help)
			# Call a "show_help" function to display a synopsis, then exit.
			show_help
			exit 0
			;;
		--no-color)
			shift
			no_color=1
			;;
		-r | --root)
			shift
			rootful=1
			;;
		-v | --verbose)
			verbose=1
			shift
			;;
		-V | --version)
			printf "distrobox: %s\n" "${version}"
			exit 0
			;;
		--) # End of all options.
			shift
			break
			;;
		-*) # Invalid options.
			printf >&2 "ERROR: Invalid flag '%s'\n\n" "$1"
			show_help
			exit 1
			;;
		*) # 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

# We depend on a container manager let's be sure we have it
# First we use podman, else docker
case "${container_manager}" in
	autodetect)
		if command -v podman > /dev/null; then
			container_manager="podman"
		elif command -v docker > /dev/null; then
			container_manager="docker"
		fi
		;;
	podman)
		container_manager="podman"
		;;
	docker)
		container_manager="docker"
		;;
	*)
		printf >&2 "Invalid input %s.\n" "${container_manager}"
		printf >&2 "The available choices are: 'autodetect', 'podman', 'docker'\n"
		;;
esac

# Be sure we have a container manager to work with.
if ! command -v "${container_manager}" > /dev/null; then
	# Error: we need at least one between docker or podman.
	printf >&2 "Missing dependency: we need a container manager.\n"
	printf >&2 "Please install one of podman or docker.\n"
	printf >&2 "You can follow the documentation on:\n"
	printf >&2 "\tman distrobox-compatibility\n"
	printf >&2 "or:\n"
	printf >&2 "\thttps://github.com/89luca89/distrobox/blob/main/docs/compatibility.md\n"
	exit 127
fi
# add verbose if -v is specified
if [ "${verbose}" -ne 0 ]; then
	container_manager="${container_manager} --log-level debug"
fi

# prepend sudo (or the specified sudo program) if we want podman or docker to be rootful
if [ "${rootful}" -ne 0 ]; then
	container_manager="${distrobox_sudo_program-} ${container_manager}"
fi

# List containers using custom format that included MOUNTS
# we do this as we can detect the custom mounts done by distrobox to distringuish
# between a normal podman or docker container and a distrobox one.
container_list=$(${container_manager} ps -a --no-trunc --format \
	"{{.ID}}|{{.Image}}|{{.Names}}|{{.Status}}|{{.Labels}}{{.Mounts}}")
printf "%-12s | %-20s | %-18s | %-16s | %-5s | %-30s\n" \
	"ID" "NAME" "STATUS" "MEM" "CPU%" "IMAGE"
IFS='
'

# if we're in not a tty, don't use colors
GREEN=""
YELLOW=""
CLEAR=""
if [ -t 0 ] && [ "${no_color}" -ne 1 ]; then
	# we're in a tty, use colors
	GREEN='\033[32m'
	YELLOW='\033[33m'
	CLEAR='\033[0m'
fi
# Header of the output
for container in ${container_list}; do
	# Check if the current container has a custom mount point for distrobox.
	if [ -z "${container##*distrobox*}" ]; then

		# Extract the information for the single container to pretty print it
		container_id="$(printf "%s" "${container}" | cut -d'|' -f1 | cut -c1-12)"
		container_image="$(printf "%s" "${container}" | cut -d'|' -f2)"
		container_name="$(printf "%s" "${container}" | cut -d'|' -f3)"
		container_status="$(printf "%s" "${container}" | cut -d'|' -f4)"

		IFS=' '
		container_stats=$(${container_manager} stats "${container_id}" \
			--no-stream --format "{{ .MemUsage }}|{{ .CPUPerc }}")
		container_mem="$(printf "%s" "${container_stats}" | cut -d'|' -f1)"
		container_cpu="$(printf "%s" "${container_stats}" | cut -d'|' -f2)"

		# If the container is Up and Running, print it in green and go next.
		if [ -z "${container_status##*Up*}" ] || [ -z "${container_status##*running*}" ]; then
			# echo -e is not defined in posix, and printing with %s will not work
			# for colors, so we're disabling this lint for color prints.
			# shellcheck disable=SC2059
			printf "${GREEN}"
		else
			# shellcheck disable=SC2059
			printf "${YELLOW}"
		fi
		# print it in yellow if not Running
		printf "%-12s | %-20s | %-18s | %-16s | %-5s | %-30s" \
			"${container_id}" "${container_name}" "${container_status}" "${container_mem}" "${container_cpu}" "${container_image}"

		# shellcheck disable=SC2059
		printf "${CLEAR}\n"
	fi
done