distrobox-upgrade

#!/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/>.

# 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

all=0
container_manager="autodetect"
distrobox_flags=""
distrobox_path="$(dirname "$(realpath "${0}")")"
rootful=0
verbose=0
version="1.5.0.2"

# 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}"

# Declare it AFTER config sourcing because we do not want a default name set.
container_name=""

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

Usage:

	distrobox-upgrade container-name
	distrobox-upgrade --all

Options:

	--help/-h:		show this message
	--all/-a:		perform for all distroboxes
	--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
}

if [ $# -eq 0 ]; then
	show_help
	exit
fi

# Parse arguments
while :; do
	case $1 in
		-h | --help)
			# Call a "show_help" function to display a synopsis, then exit.
			show_help
			exit 0
			;;
		-v | --verbose)
			verbose=1
			shift
			;;
		-V | --version)
			printf "distrobox: %s\n" "${version}"
			exit 0
			;;
		-a | --all)
			all=1
			shift
			;;
		-r | --root)
			shift
			rootful=1
			;;
		--) # 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.
			# If we have a flagless option and container_name is not specified
			# then let's accept argument as container_name
			if [ -n "$1" ]; then
				container_name="${container_name} $1"
				shift
			else
				break
			fi
			;;
	esac
done

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

if [ -z "${container_name}" ] && [ "${all}" -eq 0 ]; then
	printf >&2 "Please specify the name of the container.\n"
	exit 1
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}"
	distrobox_flags="--root"
fi

# If all, just set container_name to the list of names in distrobox-list
if [ "${all}" -ne 0 ]; then

	# prepend sudo (or the specified sudo program) if we want podman or docker to be rootful
	# shellcheck disable=SC2086,2248
	container_name="$("${distrobox_path}"/distrobox-list ${distrobox_flags} --no-color |
		tail -n +2 | cut -d'|' -f2 | tr -d ' ')"
fi

# Launch the entrypoint in upgrade mode
for container in ${container_name}; do
	printf >&2 "\033[1;31m Upgrading %s...\n\033[0m" "${container}"
	# shellcheck disable=SC2086,SC2248
	"${distrobox_path}"/distrobox-enter --additional-flags "--user root:root" \
		${distrobox_flags} ${container} -- \
		/usr/bin/entrypoint --upgrade
done