distrobox-generate-entry

#!/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
trap '[ "$?" -ne 0 ] && printf "\nAn error occurred\n"' EXIT

container_manager="autodetect"
container_name="my-distrobox"
delete=0
verbose=0
version="1.3.2"

# 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/etc/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}" ] && . "${config_file}"
done
[ -n "${DBX_CONTAINER_MANAGER}" ] && container_manager="${DBX_CONTAINER_MANAGER}"
[ -n "${DBX_CONTAINER_NAME}" ] && container_name="${DBX_CONTAINER_NAME}"

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

Usage:

	distrobox-generate-entry container-name [--delete]

Options:

	--help/-h:		show this message
	--delete/-d:		delete the entry
	--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
			;;
		-d | --delete)
			delete=1
			shift
			;;
		--) # 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="$1"
				shift
			else
				break
			fi
			;;
	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

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

# If we delete, just ask confirmation and exit.
if [ "${delete}" -ne 0 ]; then
	[ -e "${HOME}/.local/share/applications/${container_name}.desktop" ] &&
		rm "${HOME}/.local/share/applications/${container_name}.desktop"
fi

if ! ${container_manager} inspect --type container "${container_name}" > /dev/null; then
	printf >&2 "Cannot find container %s. Please create it first.\n" "${container_name}"
	exit 1
fi

distrobox_path="$(dirname "$(realpath "${0}")")"
entry_name="$(echo "${container_name}" | cut -c1 | tr "[:lower:]" "[:upper:]")$(echo "${container_name}" | cut -c2-)"

TEMPLATE="[Desktop Entry]
Name=${entry_name}
GenericName=Terminal entering ${entry_name}
Comment=Terminal entering ${entry_name}
Keywords=distrobox;
Exec=${distrobox_path}/distrobox enter ${container_name}
Icon=${HOME}/.local/share/icons/terminal-distrobox-icon.png
NoDisplay=false
Terminal=true
Type=Application
Category=Distrobox;System;Utility"

# Ensure the destination dir exists.
mkdir -p "${HOME}/.local/share/applications"

echo "${TEMPLATE}" > "${HOME}/.local/share/applications/${container_name}.desktop"