distrobox/distrobox-init

#!/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
# Expected env variables:
#	HOME
#	USER
#	SHELL

trap '[ "$?" -ne 0 ] && printf "Error: An error occurred\n"' EXIT

HOST_MOUNTS_RO_INIT="
	/etc/localtime
	/run/systemd/journal
	/run/systemd/resolve
	/run/systemd/seats
	/run/systemd/sessions
	/run/systemd/users
	/var/lib/systemd/coredump
	/var/log/journal"

# Defaults
container_additional_packages=""
init=0
init_hook=""
nvidia=0
pre_init_hook=""
rootful=0
upgrade=0
verbose=0
version="1.5.0.2"
# Print usage to stdout.
# Arguments:
#   None
# Outputs:
#   print usage with examples.
show_help() {
	cat << EOF
distrobox version: ${version}

Usage:

	distrobox-init --name ${USER} --user $(id -ru) --group $(id -rg) --home ${HOME}

Options:

	--name/-n:		user name
	--user/-u:		uid of the user
	--group/-g:		gid of the user
	--home/-d:		path/to/home of the user
	--help/-h:		show this message
	--additional-packages:	packages to install in addition
	--init/-I:		whether to use or not init
	--pre-init-hooks:	commands to execute prior to init
	--nvidia:		try to integrate host's nVidia drivers in the guest
	--upgrade/-U:		run init in upgrade mode
	--verbose/-v:		show more verbosity
	--version/-V:		show version
	--:			end arguments execute the rest as command to execute during init
EOF
}

# Parse arguments
while :; do
	case $1 in
		-h | --help)
			# Call a "show_help" function to display a synopsis, then exit.
			show_help
			exit 0
			;;
		-v | --verbose)
			shift
			verbose=1
			;;
		-V | --version)
			printf "distrobox: %s\n" "${version}"
			exit 0
			;;
		-U | --upgrade)
			shift
			upgrade=1
			;;
		-n | --name)
			if [ -n "$2" ]; then
				container_user_name="$2"
				shift
				shift
			fi
			;;
		-i | --init)
			if [ -n "$2" ]; then
				init="$2"
				shift
				shift
			fi
			;;
		-d | --home)
			if [ -n "$2" ]; then
				container_user_home="$2"
				shift
				shift
			fi
			;;
		-u | --user)
			if [ -n "$2" ]; then
				container_user_uid="$2"
				shift
				shift
			fi
			;;
		-g | --group)
			if [ -n "$2" ]; then
				container_user_gid="$2"
				shift
				shift
			fi
			;;
		--pre-init-hooks)
			if [ -n "$2" ]; then
				pre_init_hook="$2"
			fi
			shift
			shift
			;;
		--additional-packages)
			if [ -n "$2" ]; then
				container_additional_packages="$2"
			fi
			shift
			shift
			;;
		--nvidia)
			if [ -n "$2" ]; then
				nvidia="$2"
				shift
				shift
			fi
			;;
		--)
			shift
			init_hook=$*
			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

# Check we're running inside a container and not on the host
if [ ! -f /run/.containerenv ] && [ ! -f /.dockerenv ] && [ -z "${container:-}" ]; then
	printf >&2 "You must run %s inside a container!\n" " $(basename "$0")"
	printf >&2 "distrobox-init should only be used as an entrypoint for a distrobox!\n\n"
	printf >&2 "This is not intended to be used manually, but instead used by distrobox-enter\n"
	printf >&2 "to set up the container's entrypoint.\n"
	exit 126
fi

# Ensure the foundamental variables are set and not empty, we will not proceed if
# they are not all set.
if [ "${upgrade}" -eq 0 ]; then
	[ -z "${container_user_gid}" ] && printf "Error: Invalid arguments, missing user gid\n" && exit 2
	[ -z "${container_user_home}" ] && printf "Error: Invalid argument, missing user home\n" && exit 2
	[ -z "${container_user_name}" ] && printf "Error: Invalid arguments, missing username\n" && exit 2
	[ -z "${container_user_uid}" ] && printf "Error: Invalid arguments, missing user uid\n" && exit 2
fi
set -o errexit
set -o nounset
# set verbosity
if [ "${verbose}" -ne 0 ]; then
	set -o xtrace
fi

# Determine if we're in a rootful container, generally if we're able to read
# host's /etc/shadow, it means we're really root!
#
# if /run/.nopasswd is present, let's treat the init as rootless, this is not
# a good thing, users behold!
if stat /run/host/etc/shadow > /dev/null &&
	[ "$(stat -c "%u" /run/host/etc/shadow)" = "0" ] &&
	[ ! -e /run/.nopasswd ]; then
	rootful=1
fi

# Print mount flags considered "locked".
# Arguments:
# 	source_dir
# Outputs:
# 	Comma-separated list of locked mount flags
get_locked_mount_flags() (
	source_dir="$1"
	prev_dir=""
	locked_flags=""

	if [ ! -d "${source_dir}" ]; then
		return 0
	fi

	# If we can't read the directory, exit
	if ! ls "${source_dir}" 2> /dev/null > /dev/null; then
		return 0
	fi

	# Get mount flags of given directory, using nearest mountpoint.
	# Earlier versions of findmnt did not check parents until it found a mountpoint,
	# so we use a workaround with dirname.
	while true; do
		flags="$(findmnt --noheadings --output OPTIONS --target "${source_dir}" || :)"
		# shellcheck disable=SC2181
		if [ -n "${flags}" ]; then
			break
		fi
		prev_dir="${source_dir}"
		source_dir="$(dirname "${source_dir}")"
		[ "${source_dir}" = "${prev_dir}" ] && return 1
	done

	for flag in nodev noexec nosuid; do
		if echo "${flags}" | grep -q "${flag}"; then
			# Locked flag found, append to list while avoiding leading/trailing commas
			locked_flags="${locked_flags:+${locked_flags},}${flag}"
		fi
	done

	echo "${locked_flags}"
)

# init_readlink is a simplistic implementation for
# readlink -fm
# we use this as readlink -fm does not work on
# busybox systems, and we need the path even for broken links.
# Arguments:
#	source file
# Outputs:
#	original path the link is pointing
init_readlink() {
	# shellcheck disable=SC2010
	ls -l "${1}" | grep -Eo '\->.*' | cut -d' ' -f2- | sed 's|\.\./|/|g'
}

# Bind mount or error.
# Arguments:
#   source_dir
#	target_dir
#	mount_flags -> optional
# Outputs:
#   No output if all ok
#	Error if not
mount_bind() (
	source_dir="$1"
	target_dir="$2"
	mount_flags=""
	if [ "$#" -gt 2 ]; then
		mount_flags="$3"
	fi

	# Adjust source_dir in order to point to /run/host if it's a symlink
	if [ -L "${source_dir}" ]; then
		source_dir="$(init_readlink "${source_dir}")"
		if ! echo "${source_dir}" | grep -q "/run/host"; then
			source_dir="/run/host${source_dir}"
		fi
	fi

	# if source dir doesn't exist, just exit
	if [ ! -d "${source_dir}" ] && [ ! -f "${source_dir}" ]; then
		return 0
	fi

	# if target_dir exists, check if it is a mountpoint and umount it.
	if [ -e "${target_dir}" ] && findmnt "${target_dir}" > /dev/null; then
		umount "${target_dir}"
	fi

	# if target_dir exists, and is a symlink, remove it
	if [ -L "${target_dir}" ]; then
		rm -f "${target_dir}"
	fi

	# if the source_dir exists, then create the target_dir
	if [ -d "${source_dir}" ]; then
		if ! mkdir -p "${target_dir}"; then
			printf "Warning: cannot create mount target directory: %s\n" "${target_dir}"
			return 1
		fi
	# if instead it's a file, create it with touch
	elif [ -f "${source_dir}" ]; then
		if [ ! -d "$(dirname "${target_dir}")" ]; then
			mkdir -p "$(dirname "${target_dir}")"
		fi
		# if we encounter a broken link, and we touch it
		# then remove the broken link, the next touch
		# will cover it.
		if ! touch "${target_dir}"; then
			printf "Warning: cannot create mount target file: %s\n" "${target_dir}"
			return 1
		fi
	fi

	# Add mountflags if needed, if no are specified, use rslave as default.
	if [ "${mount_flags}" = "" ]; then
		mount_flags="rslave"
	fi
	# bind mount source_dir to target_dir, return error if not successful
	if ! mount --rbind -o "${mount_flags}" "${source_dir}" "${target_dir}"; then
		printf "Warning: failed to bind mount %s to %s\n" "${source_dir}" "${target_dir}"
		return 1
	fi

	return 0
)

if [ -n "${pre_init_hook}" ]; then
	printf "distrobox: Executing pre-init hooks...\n"
	# execute pre-init hooks if specified
	# shellcheck disable=SC2086
	eval ${pre_init_hook}
fi

###############################################################################
printf "distrobox: Installing basic packages...\n"
# Extract shell name from the $SHELL environment variable
# If not present as package in the container, we want to install it.
shell_pkg="$(basename "${SHELL:-"bash"}")"
# Ash shell is an exception, it is not a standalone package, but part of busybox.
# for this reason, use this quirk to adjust the package name to standard bash.
if [ "${shell_pkg}" = "ash" ]; then
	shell_pkg="bash"
fi

# Check dependencies in a list, and install all if one is missing
missing_packages=0
dependencies="
	bc
	bzip2
	chpasswd
	curl
	diff
	find
	findmnt
	gpg
	hostname
	less
	lsof
	man
	mount
	passwd
	pigz
	pinentry
	ping
	ps
	rsync
	script
	ssh
	sudo
	time
	tree
	umount
	unzip
	useradd
	wc
	wget
	xauth
	zip
	${shell_pkg}
"
for dep in ${dependencies}; do
	! command -v "${dep}" > /dev/null && missing_packages=1 && break
done

# Check if dependencies are met for the script to run.
if [ "${upgrade}" -ne 0 ] ||
	[ "${missing_packages}" -ne 0 ] ||
	{ [ -n "${container_additional_packages}" ] && [ ! -e /.containersetupdone ]; }; then

	# Detect the available package manager
	# install minimal dependencies needed to bootstrap the container:
	#	the same shell that's on the host
	#	sudo, mount, find
	#	passwd, groupadd and useradd
	if command -v apk; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			apk upgrade
			exit
		fi
		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! apk add "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			alpine-base
			bash
			bash-completion
			bc
			bzip2
			coreutils
			curl
			diffutils
			docs
			findmnt
			findutils
			gcompat
			gnupg
			gpg
			iproute2
			iputils
			keyutils
			less
			libc-utils
			libcap
			lsof
			man-pages
			mandoc
			mount
			musl-utils
			ncurses
			ncurses-terminfo
			net-tools
			openssh-client
			pigz
			pinentry
			posix-libc-utils
			procps
			rsync
			shadow
			su-exec
			sudo
			tar
			tcpdump
			tree
			tzdata
			umount
			unzip
			util-linux
			util-linux-misc
			vte3
			wget
			which
			xauth
			xz
			zip
			$(apk search -q mesa-dri)
			$(apk search -q mesa-vulkan)
			vulkan-loader
		"
		install_pkg=""
		for dep in ${deps}; do
			if apk info "${dep}" > /dev/null; then
				install_pkg="${install_pkg} ${dep}"
			fi
		done
		# shellcheck disable=SC2086
		apk add --force-overwrite ${install_pkg}

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			apk del tzdata
			apk add tzdata
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			apk add --force-overwrite ${container_additional_packages}
		fi

		# Workaround for when sudo is missing, we use su-exec as a replacement.
		if [ -e /sbin/su-exec ]; then
			chmod u+s /sbin/su-exec

			if [ ! -e /usr/bin/sudo ]; then
				printf "%s\n%s" '#!/bin/sh' '/sbin/su-exec root "$@"' > /usr/bin/sudo
				chmod +x /usr/bin/sudo
			fi
		fi

	elif command -v apt-get; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			apt-get update
			apt-get upgrade -y
			exit
		fi
		# In Ubuntu official images, dpkg is configured to ignore locale and docs
		# This however, results in a rather poor out-of-the-box experience
		# So, let's enable them.
		rm -f /etc/dpkg/dpkg.cfg.d/excludes

		export DEBIAN_FRONTEND=noninteractive
		apt-get update
		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! apt-get install -y "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			apt-utils
			bash-completion
			bc
			bzip2
			curl
			dialog
			diffutils
			findutils
			gnupg
			gnupg2
			gpgsm
			hostname
			iproute2
			iputils-ping
			keyutils
			language-pack-en
			less
			libcap2-bin
			libkrb5-3
			libnss-mdns
			libnss-myhostname
			libvte-2.9*-common
			libvte-common
			locales
			lsof
			man-db
			manpages
			mtr
			ncurses-base
			openssh-client
			passwd
			pigz
			pinentry-curses
			procps
			rsync
			sudo
			tcpdump
			time
			traceroute
			tree
			tzdata
			unzip
			util-linux
			wget
			xauth
			xz-utils
			zip
			libegl1-mesa
			libgl1-mesa-glx
			libvulkan1
			mesa-vulkan-drivers
		"
		install_pkg=""
		for dep in ${deps}; do
			if apt-cache show "${dep}" | grep -q Package; then
				install_pkg="${install_pkg} ${dep}"
			fi
		done
		# shellcheck disable=SC2086
		apt-get install -y ${install_pkg}

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			sed -i "s|#.*en_US.UTF-8|en_US.UTF-8|g" /etc/locale.gen
			locale-gen
			update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
			dpkg-reconfigure locales
		fi

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			apt-get --reinstall install tzdata
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			apt-get install -y ${container_additional_packages}
		fi

	elif command -v dnf; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			dnf upgrade -y
			exit
		fi
		# In dnf family official images, dnf is configured to ignore locale and docs
		# This however, results in a rather poor out-of-the-box experience
		# So, let's enable them.
		sed -i '/tsflags=nodocs/d' /etc/dnf/dnf.conf

		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! dnf install -y "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			bash-completion
			bc
			bzip2
			curl
			diffutils
			dnf-plugins-core
			findutils
			glibc-all-langpacks
			glibc-locale-source
			gnupg2
			gnupg2-smime
			hostname
			iproute
			iputils
			keyutils
			krb5-libs
			less
			lsof
			man-db
			man-pages
			mtr
			ncurses
			nss-mdns
			openssh-clients
			pam
			passwd
			pigz
			pinentry
			procps-ng
			rsync
			shadow-utils
			sudo
			tcpdump
			time
			traceroute
			tree
			tzdata
			unzip
			util-linux
			vte-profile
			wget
			which
			whois
			words
			xorg-x11-xauth
			xz
			zip
			mesa-dri-drivers
			mesa-vulkan-drivers
			vulkan
		"
		# shellcheck disable=SC2086,2046
		dnf install -y --allowerasing $(dnf repoquery -q --latest-limit 1 --arch "$(uname -m)" ${deps})

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			LANG=en_US.UTF-8 localedef -i en_US -f UTF-8 en_US.UTF-8
		fi

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			dnf reinstall -y tzdata
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			dnf install -y ${container_additional_packages}
		fi

	elif command -v emerge; then
		# Check if the container we are using has a ::gentoo repo defined,
		# if it is defined and it is empty, then synchroznize it.
		gentoo_repo="$(portageq get_repo_path / gentoo)"
		if [ -n "${gentoo_repo}" ] && [ ! -e "${gentoo_repo}" ]; then
			emerge-webrsync
		fi
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			emerge --sync
			exit
		fi
		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! emerge --ask=n --autounmask-continue --noreplace --quiet-build "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			app-crypt/gnupg
			bash-completion
			diffutils
			findutils
			less
			ncurses
			net-misc/curl
			pinentry
			procps
			shadow
			sudo
			sys-devel/bc
			sys-process/lsof
			util-linux
			wget
		"
		install_pkg=""
		for dep in ${deps}; do
			if [ "$(emerge --search "${dep}" | grep "Applications found" | grep -Eo "[0-9]")" -gt 0 ]; then
				# shellcheck disable=SC2086
				install_pkg="${install_pkg} ${dep}"
			fi
		done
		# shellcheck disable=SC2086
		emerge --ask=n --autounmask-continue --noreplace --quiet-build ${install_pkg}

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			sed -i "s|#.*en_US.UTF-8|en_US.UTF-8|g" /etc/locale.gen
			locale-gen
			cat << EOF > /etc/env.d/02locale
LANG=en_US.UTF-8
LC_CTYPE=en_US.UTF-8
EOF
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			emerge --ask=n --autounmask-continue --noreplace --quiet-build \
				${container_additional_packages}
		fi

	elif command -v microdnf; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			microdnf upgrade -y
			exit
		fi
		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! microdnf install -y "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			bash-completion
			bc
			bzip2
			diffutils
			dnf-plugins-core
			findutils
			glibc-all-langpacks
			glibc-locale-source
			gnupg2
			gnupg2-smime
			hostname
			iproute
			iputils
			keyutils
			krb5-libs
			less
			lsof
			man-db
			man-pages
			mtr
			ncurses
			nss-mdns
			openssh-clients
			pam
			passwd
			pigz
			pinentry
			procps-ng
			rsync
			shadow-utils
			sudo
			tcpdump
			time
			traceroute
			tree
			tzdata
			unzip
			util-linux
			vte-profile
			wget
			which
			whois
			words
			xorg-x11-xauth
			xz
			zip
			mesa-dri-drivers
			mesa-vulkan-drivers
			vulkan
		"
		install_pkg=""
		for dep in ${deps}; do
			if [ "$(microdnf repoquery "${dep}" | wc -l)" -gt 0 ]; then
				install_pkg="${install_pkg} ${dep}"
			fi
		done
		# shellcheck disable=SC2086,SC2046
		microdnf install -y ${install_pkg}

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			LANG=en_US.UTF-8 localedef -i en_US -f UTF-8 en_US.UTF-8
		fi

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			microdnf reinstall -y tzdata
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			microdnf install -y ${container_additional_packages}
		fi

	elif command -v pacman; then
		# Update the package repository cache exactly once before installing packages.
		pacman -S -y -y

		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			pacman -S -u --noconfirm
			exit
		fi
		# In archlinux official images, pacman is configured to ignore locale and docs
		# This however, results in a rather poor out-of-the-box experience
		# So, let's enable them.
		sed -i "s|NoExtract.*||g" /etc/pacman.conf
		sed -i "s|NoProgressBar.*||g" /etc/pacman.conf

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			sed -i "s|#.*en_US.UTF-8|en_US.UTF-8|g" /etc/locale.gen
			locale-gen -a
		fi

		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! pacman -S --needed --noconfirm "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			bash-completion
			bc
			curl
			diffutils
			findutils
			glibc
			gnupg
			inetutils
			keyutils
			less
			lsof
			man-db
			man-pages
			mlocate
			mtr
			ncurses
			nss-mdns
			openssh
			pigz
			pinentry
			procps-ng
			rsync
			shadow
			sudo
			tcpdump
			time
			traceroute
			tree
			tzdata
			unzip
			util-linux
			util-linux-libs
			vte-common
			wget
			words
			xorg-xauth
			zip
			mesa
			opengl-driver
			vulkan-intel
			vte-common
			vulkan-radeon
		"
		install_pkg=""
		for dep in ${deps}; do
			if pacman -Ss "${dep}" > /dev/null; then
				install_pkg="${install_pkg} ${dep}"
			fi
		done
		# shellcheck disable=SC2086
		pacman -S --noconfirm ${install_pkg}

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			pacman -S --noconfirm tzdata
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			pacman -S --needed --noconfirm ${container_additional_packages}
		fi

	elif command -v slackpkg; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			yes | slackpkg upgrade-all -default_answer=yes -batch=yes
			exit
		fi
		slackpkg update
		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! yes | slackpkg install -default_answer=yes -batch=yes "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			bash-completion
			bc
			curl
			diffutils
			findutils
			glew
			glibc
			glu
			gnupg2
			iputils
			less
			libX11
			libXau
			libXdamage
			libXdmcp
			libXext
			libXfixes
			libXxf86vm
			libdrm
			libvte-2
			libxcb
			libxcb-dri2
			libxcb-dri3
			libxcb-glx
			libxcb-present
			libxcb-randr
			libxcb-render
			libxcb-shape
			libxcb-sync
			libxcb-xfixes
			libxshmfence
			lsof
			man
			mesa
			ncurses
			openssh
			pinentry
			procps
			rsync
			shadow
			ssh
			sudo
			time
			wget
			xauth
		"
		install_pkg=""
		dep=""
		for dep in ${deps}; do
			if ! slackpkg search "${dep}" | grep -q "No package name matches the pattern"; then
				install_pkg="${install_pkg} ${dep}"
			fi
		done

		rm -f /var/lock/slackpkg.*

		# shellcheck disable=SC2086
		yes | slackpkg install -default_answer=yes -batch=yes ${install_pkg}

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			yes | slackpkg install -default_answer=yes -batch=yes \
				${container_additional_packages}
		fi

	elif command -v swupd; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			swupd update
			exit
		fi

		swupd bundle-add os-core-search

		deps="
			bc
			cryptography
			curl
			network-basic
			procps-ng
			rsync
			shells
			sysadmin-basic
			unzip
			wget
			x11-tools
			zip
			devpkg-Vulkan-Loader
			lib-opengl
		"
		install_pkg=""
		for dep in ${deps}; do
			if swupd search "${dep}" > /dev/null; then
				install_pkg="${install_pkg} ${dep}"
			fi
		done
		# shellcheck disable=SC2086
		swupd bundle-add ${install_pkg}

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			swupd bundle-add ${container_additional_packages}
		fi

	elif command -v xbps-install; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			xbps-install -Syu
			exit
		fi
		# Ensure we avoid errors by keeping xbps updated
		xbps-install -Syu xbps
		# We have to lock this package, as it's incompatible with distrobox's
		# mount process.
		xbps-pkgdb -m repolock base-files
		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! xbps-install -Sy "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			bash-completion
			bc
			bzip2
			curl
			diffutils
			findutils
			gnupg2
			inetutils-ping
			iproute2
			less
			lsof
			man-db
			mit-krb5-client
			mit-krb5-libs
			mtr
			ncurses-base
			nss
			openssh
			pigz
			pinentry-tty
			procps-ng
			rsync
			shadow
			sudo
			time
			traceroute
			tree
			tzdata
			unzip
			util-linux
			xauth
			xz
			zip
			wget
			vte3
			mesa-dri
			vulkan-loader
			mesa-vulkan-intel
			mesa-vulkan-radeon
		"
		install_pkg=""
		for dep in ${deps}; do
			if [ "$(xbps-query -Rs "${dep}" | wc -l)" -gt 0 ]; then
				install_pkg="${install_pkg} ${dep}"
			fi
		done
		# shellcheck disable=SC2086
		xbps-install -Sy ${install_pkg}

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			sed -i "s|#.*en_US.UTF-8|en_US.UTF-8|g" /etc/default/libc-locales
			xbps-reconfigure --force glibc-locales
		fi

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			xbps-install --force -y tzdata
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			xbps-install -Sy ${container_additional_packages}
		fi

	elif command -v yum; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			yum upgrade -y
			exit
		fi
		# In yum family official images, yum is configured to ignore locale and docs
		# This however, results in a rather poor out-of-the-box experience
		# So, let's enable them.
		sed -i '/tsflags=nodocs/d' /etc/yum.conf

		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		if ! yum install -y "${shell_pkg}"; then
			shell_pkg="bash"
		fi
		deps="
			${shell_pkg}
			bash-completion
			bc
			bzip2
			curl
			diffutils
			dnf-plugins-core
			findutils
			glibc-all-langpacks
			glibc-locale-source
			gnupg2
			gnupg2-smime
			hostname
			iproute
			iputils
			keyutils
			krb5-libs
			less
			lsof
			man-db
			man-pages
			mtr
			ncurses
			nss-mdns
			openssh-clients
			pam
			passwd
			pigz
			pinentry
			procps-ng
			rsync
			shadow-utils
			sudo
			tcpdump
			time
			traceroute
			tree
			tzdata
			unzip
			util-linux
			vte-profile
			wget
			which
			whois
			words
			xorg-x11-xauth
			xz
			zip
			mesa-dri-drivers
			mesa-vulkan-drivers
			vulkan
		"
		# shellcheck disable=SC2086,SC2046
		yum install -y $(yum list -q ${deps} |
			grep -v "Packages" |
			grep "$(uname -m)" |
			cut -d' ' -f1)

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			LANG=en_US.UTF-8 localedef -i en_US -f UTF-8 en_US.UTF-8
		fi

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			yum reinstall -y tzdata
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			yum install -y ${container_additional_packages}
		fi

	elif command -v zypper; then
		# If we need to upgrade, do it and exit, no further action required.
		if [ "${upgrade}" -ne 0 ]; then
			zypper dup -y
			exit
		fi
		if ! zypper install -y "${shell_pkg}"; then
			shell_pkg="bash"
		fi

		# In openSUSE official images, zypper is configured to ignore recommended
		# packages (i.e., weak dependencies). This however, results in a rather
		# poor out-of-the-box experience (e.g., when trying to run GUI apps).
		# So, let's enable them. For the same reason, we make sure we install
		# docs.
		sed -i 's/.*solver.onlyRequires.*/solver.onlyRequires = false/g' /etc/zypp/zypp.conf
		sed -i 's/.*rpm.install.excludedocs.*/rpm.install.excludedocs = no/g' /etc/zypp/zypp.conf
		# With recommended packages, something might try to pull in
		# parallel-printer-support which can't be installed in rootless containers.
		# Since we very much likely never need it, just lock it
		zypper al parallel-printer-support
		# Check if shell_pkg is available in distro's repo. If not we
		# fall back to bash, and we set the SHELL variable to bash so
		# that it is set up correctly for the user.
		deps="
			${shell_pkg}
			bash-completion
			bc
			bzip2
			curl
			diffutils
			findutils
			glibc-locale
			glibc-locale-base
			gnupg
			hostname
			iputils
			keyutils
			less
			libvte-2*
			lsof
			man
			man-pages
			mtr
			ncurses
			nss-mdns
			openssh-clients
			pam
			pam-extra
			pigz
			pinentry
			procps
			rsync
			shadow
			sudo
			system-group-wheel
			systemd
			time
			timezone
			tree
			unzip
			util-linux
			util-linux-systemd
			wget
			words
			xauth
			zip
			Mesa-dri
			libvulkan1
			libvulkan_intel
			libvulkan_radeon
		"
		# Mark gpg errors (exit code 106) as non-fatal, but don't pull anything from unverified repos
		# shellcheck disable=SC2086,SC2046
		zypper -n install -y $(zypper -n -q se -x ${deps} | grep -e 'package$' | cut -d'|' -f2) || [ ${?} = 106 ]

		# In case the locale is not available, install it
		# will ensure we don't fallback to C.UTF-8
		if ! locale -a | grep -qi en_us.utf8; then
			LANG=en_US.UTF-8 localedef -i en_US -f UTF-8 en_US.UTF-8
		fi

		# Ensure we have tzdata installed and populated, sometimes container
		# images blank the zoneinfo directory, so we reinstall the package to
		# ensure population
		if [ ! -e /usr/share/zoneinfo/UTC ]; then
			zypper install -f -y timezone
		fi

		# Install additional packages passed at distrbox-create time
		if [ -n "${container_additional_packages}" ]; then
			# shellcheck disable=SC2086
			zypper install -y ${container_additional_packages}
		fi
	else
		printf "Error: could not find a supported package manager.\n"
		printf "Error: could not set up base dependencies.\n"
		# Exit as command not found
		exit 127
	fi

	touch /.containersetupdone
fi

# Set SHELL to the install path inside the container
SHELL="$(command -v "${shell_pkg}")"

# Attempt to download host-spawn during init, we don't care if it fails, so let's
# continue in that case
/usr/bin/distrobox-host-exec -Y test 2> /dev/null > /dev/null || :

# If xdg-open is not present, do a link of it. This is handy to handle opening of
# links, files and apps from inside the container into the host.
if ! command -v xdg-open; then
	mkdir -p /usr/local/bin/
	ln -sf /usr/bin/distrobox-host-exec /usr/local/bin/xdg-open
fi
###############################################################################

###############################################################################
printf "distrobox: Setting up devpts mounts...\n"

# Instantiate a new /dev/pts mount, this will ensure pseudoterminals are container-scoped
# and make easier in case of initful containers to have a separate /dev/console
#
# Podman supports a mount option to do this at creation time, but we're doing it
# here to support also other container rmanagers which does not support that flag
mount -t devpts devpts -o noexec,nosuid,newinstance,ptmxmode=0666,mode=0620 /dev/pts/
mount --bind /dev/pts/ptmx /dev/ptmx

# Change mount propagation to shared to make the environment more similar to a
# modern Linux system, e.g. with Systemd as PID 1.
mount --make-rshared /
###############################################################################

###############################################################################
printf "distrobox: Setting up read-only mounts...\n"

# We'll also bind mount in READ-ONLY useful directories from the host
HOST_MOUNTS_RO="
	/etc/localtime
	/var/lib/systemd/coredump
	/var/log/journal"
for host_mount_ro in ${HOST_MOUNTS_RO}; do
	# Mounting read-only in a user namespace will trigger a check to see if certain
	# "locked" flags are changed. This ensures we explicitly reuse those flags.
	locked_flags="$(get_locked_mount_flags /run/host"${host_mount_ro}")"
	mount_bind /run/host"${host_mount_ro}" "${host_mount_ro}" ro"${locked_flags:+,${locked_flags}}"
done
###############################################################################

###############################################################################
printf "distrobox: Setting up read-write mounts...\n"

# On some ostree systems, home is in /var/home, but most of the software expects
# it to be in /home. In the hosts systems this is fixed by using a symlink.
# Do something similar here with a bind mount.
if [ -e "/var/home/${container_user_name}" ]; then
	if ! mount_bind "/run/host/var/home/${container_user_name}" "/home/${container_user_name}"; then
		printf "Warning: Cannot bind mount %s to /run/host%s\n" "/var/home" "/home"
	fi
fi

# We'll also bind mount READ-WRITE useful mountpoints to pass external drives and libvirt from
# the host to the container
HOST_MOUNTS="
	/etc/host.conf
	/etc/machine-id
	/media
	/mnt
	/run/libvirt
	/run/media
	/run/netconfig/
	/run/systemd/journal
	/run/systemd/resolve/
	/run/systemd/seats
	/run/systemd/sessions
	/run/systemd/users
	/run/udev
	/var/lib/libvirt
	/var/mnt"
for host_mount in ${HOST_MOUNTS}; do
	if ! mount_bind /run/host"${host_mount}" "${host_mount}"; then
		printf "Warning: Cannot bind mount %s to /run/host%s\n" "${host_mount}" "${host_mount}"
	fi
done
###############################################################################

###############################################################################
printf "distrobox: Setting up host's sockets integration...\n"
# Find all the user's socket and mount them inside the container
# this will allow for continuity of functionality between host and container
#
# for example using `podman --remote` to control the host's podman from inside
# the container or accessing docker and libvirt sockets.
host_sockets="$(find /run/host/run \
	-path /run/host/run/media -prune -o \
	-path /run/host/run/timeshift -prune -o \
	-name 'user' -prune -o \
	-name 'bees' -prune -o \
	-name 'nscd' -prune -o \
	-name 'system_bus_socket' -prune -o \
	-type s -print \
	2> /dev/null || :)"

# we're excluding system dbus socket and nscd socket here. Including them will
# create many problems with package managers thinking they have access to
# system dbus or user auth cache misused.
for host_socket in ${host_sockets}; do
	container_socket="$(printf "%s" "${host_socket}" | sed 's|/run/host||g')"
	# Check if the socket already exists or the symlink already exists
	if [ ! -S "${container_socket}" ] && [ ! -L "${container_socket}" ]; then
		# link it.
		rm -f "${container_socket}"
		mkdir -p "$(dirname "${container_socket}")"
		if ! ln -s "${host_socket}" "${container_socket}"; then
			printf "Warning: Cannot link socket %s to %s\n" "${host_socket}" "${container_socket}"
		fi
	fi
done
###############################################################################

# If --nvidia, we try to integrate host's nvidia drivers in to the guest
if [ "${nvidia}" -eq 1 ]; then
	printf "distrobox: Setting up host's nvidia integration...\n"

	# First we find all non-lib files we need in /etc/
	#	- confs
	#	- icd files
	#	- egl files
	NVIDIA_ETC="$(find /run/host/etc/ \
		-type f -iname "*nvidia*" -print || :)"
	for nvidia_file in ${NVIDIA_ETC}; do
		dest_file="$(printf "%s" "${nvidia_file}" | sed 's|/run/host||g')"
		mount_bind "${nvidia_file}" "${dest_file}" ro
	done

	# First we find all non-lib files we need, this includes
	#	- binaries
	#	- confs
	#	- icd files
	#	- egl files
	NVIDIA_FILES="$(find /run/host/usr/ \
		-path "/run/host/usr/share/doc*" -prune -o \
		-path "/run/host/usr/src*" -prune -o \
		-path "/run/host/usr/lib*/modules*" -prune -o \
		-path "/run/host/usr/share/man*" -prune -o \
		-path "/run/host/usr/lib*" -prune -o \
		-type f -iname "*nvidia*" -print || :)"
	for nvidia_file in ${NVIDIA_FILES}; do
		dest_file="$(printf "%s" "${nvidia_file}" | sed 's|/run/host||g')"
		mount_bind "${nvidia_file}" "${dest_file}" ro
	done

	# Then we find all the ".so" libraries, there are searched separately
	# because we need to extract the relative path to mount them in the
	# correct path based on the guest's setup
	NVIDIA_LIBS="$(find /run/host/usr/lib* \
		-iname "*nvidia*.so*" \
		-o -iname "libcuda*.so*" \
		-o -iname "libnvcuvid*.so*" \
		-o -iname "libnvoptix*.so*" ||
		:)"
	for nvidia_lib in ${NVIDIA_LIBS}; do
		dest_file="$(printf "%s" "${nvidia_lib}" |
			sed 's|/run/host/usr/lib/x86_64-linux-gnu/||g' |
			sed 's|/run/host/usr/lib/i386-linux-gnu/||g' |
			sed 's|/run/host/usr/lib64/||g' |
			sed 's|/run/host/usr/lib/||g')"

		type="file"
		if [ -L "${nvidia_lib}" ]; then
			type="link"
		fi

		# In case we're dealing with a 32bit library, we should try to put
		# it in a compelling path
		if file "${nvidia_lib}" | grep -q "32-bit"; then
			if [ -e "/usr/lib/i386-linux-gnu/" ]; then
				if [ "${type}" = "link" ]; then
					mkdir -p "$(dirname "/usr/lib/i386-linux-gnu/${dest_file}")"
					cp -d "${nvidia_lib}" "/usr/lib/i386-linux-gnu/${dest_file}"
					continue
				fi

				mount_bind "${nvidia_lib}" "/usr/lib/i386-linux-gnu/${dest_file}" ro
				# /usr/lib64 is common in rpm based distros
			elif [ -e "/usr/lib32" ]; then
				if [ "${type}" = "link" ]; then
					mkdir -p "$(dirname "/usr/lib32/${dest_file}")"
					cp -d "${nvidia_lib}" "/usr/lib32/${dest_file}"
					continue
				fi

				mount_bind "${nvidia_lib}" "/usr/lib32/${dest_file}" ro
				# fallback to /usr/lib if none of the previous
			else
				if [ "${type}" = "link" ]; then
					mkdir -p "$(dirname "/usr/lib/${dest_file}")"
					cp -d "${nvidia_lib}" "/usr/lib/${dest_file}"
					continue
				fi

				mount_bind "${nvidia_lib}" "/usr/lib/${dest_file}" ro
			fi
			continue
		fi

		# In the guest we need to adjust the destination path, so if we're on
		# debian based containers, we need to target /usr/lib/x86_64-linux-gnu/
		if [ -e "/usr/lib/x86_64-linux-gnu/" ]; then
			if [ "${type}" = "link" ]; then
				mkdir -p "$(dirname "/usr/lib/x86_64-linux-gnu/${dest_file}")"
				cp -d "${nvidia_lib}" "/usr/lib/x86_64-linux-gnu/${dest_file}"
				continue
			fi

			mount_bind "${nvidia_lib}" "/usr/lib/x86_64-linux-gnu/${dest_file}" ro
			# /usr/lib64 is common in rpm based distros
		elif [ -e "/usr/lib64" ]; then
			if [ "${type}" = "link" ]; then
				mkdir -p "$(dirname "/usr/lib64/${dest_file}")"
				cp -d "${nvidia_lib}" "/usr/lib64/${dest_file}"
				continue
			fi

			mount_bind "${nvidia_lib}" "/usr/lib64/${dest_file}" ro
			# fallback to /usr/lib if none of the previous
		else
			if [ "${type}" = "link" ]; then
				mkdir -p "$(dirname "/usr/lib/${dest_file}")"
				cp -d "${nvidia_lib}" "/usr/lib/${dest_file}"
				continue
			fi

			mount_bind "${nvidia_lib}" "/usr/lib/${dest_file}" ro
		fi
	done

	# Refresh ldconfig cache, also detect if there are empty files remaining
	# and clean them.
	# This could happen when upgrading drivers and changing versions.
	empty_libs="$(ldconfig 2>&1 | grep -Eo "File.*is empty" | cut -d' ' -f2)"
	if [ -n "${empty_libs}" ]; then
		# shellcheck disable=SC2086
		find ${empty_libs} -delete || :
	fi
fi

###############################################################################
printf "distrobox: Integrating host's themes, icons, fonts...\n"
# Themes and icons integration works using a bind mount inside the container
# of the host's themes and icons directory. This ensures that the host's home will
# not be littered with files and directories and broken symlinks.
if ! mount_bind "/run/host/usr/share/themes" "/usr/local/share/themes"; then
	printf "Warning: Cannot bind mount /run/host/usr/share/themes to /usr/local/share/themes\n"
	printf "Warning: Themes integration with the host is disabled.\n"
fi
if ! mount_bind "/run/host/usr/share/icons" "/usr/local/share/icons"; then
	printf "Warning: Cannot bind mount /run/host/usr/share/icons to /usr/local/share/icons\n"
	printf "Warning: Icons integration with the host is disabled.\n"
fi
if ! mount_bind "/run/host/usr/share/fonts" "/usr/local/share/fonts"; then
	printf "Warning: Cannot bind mount /run/host/usr/share/fonts to /usr/local/share/fonts\n"
	printf "Warning: Fonts integration with the host is disabled.\n"
fi
###############################################################################

###############################################################################
if [ "${init}" -eq 0 ]; then
	printf "distrobox: Setting up package manager exceptions...\n"
fi

# In case of an RPM distro, we can specify that our bind_mount directories
# are in fact net shares. This prevents conflicts during package installations.
if [ -d "/usr/lib/rpm/macros.d/" ] && [ "${init}" -eq 0 ]; then
	printf "distrobox: Setting up rpm exceptions...\n"
	# Loop through all the environment vars
	# and export them to the container.
	net_mounts=""
	for net_mount in \
		${HOST_MOUNTS_RO} ${HOST_MOUNTS} \
		'/dev' '/proc' '/sys' '/tmp' \
		'/etc/hosts' '/etc/resolv.conf'; do

		net_mounts="${net_mount}:${net_mounts}"
	done
	net_mounts=${net_mounts%?}
	cat << EOF > /usr/lib/rpm/macros.d/macros.distrobox
%_netsharedpath ${net_mounts}
EOF
fi

if { [ -d "/etc/dpkg/dpkg.cfg.d/" ] || [ -d "/usr/share/libalpm/scripts" ]; } && [ "${init}" -eq 0 ]; then
	cat << EOF > /etc/distrobox-pre-hook.sh
#!/bin/sh
mounts="${HOST_MOUNTS_RO_INIT}"
for mount in \$mounts; do
	if findmnt \$mount >/dev/null; then
		umount -l \$mount
	fi
done
EOF
	cat << EOF > /etc/distrobox-post-hook.sh
#!/bin/sh
mounts="${HOST_MOUNTS_RO_INIT}"
for mount in \$mounts; do
	if [ -e /run/host/\$mount ] || [ -e /run/host/\$(readlink -fm /run/host/\$mount) ]; then
		if [ ! -d /run/host/\$mount ]; then
			rm -f \$mount && touch \$mount
		fi
		if ! mount --rbind \$(readlink -fm /run/host/\$mount) \$mount; then
			mount --rbind /run/host/\$(readlink -fm /run/host/\$mount) \$mount
		fi
	fi
done
EOF
	chmod +x /etc/distrobox-pre-hook.sh /etc/distrobox-post-hook.sh
fi

# In case of an DEB distro, we can specify that our bind_mount directories
# have to be ignored. This prevents conflicts during package installations.
if [ -d "/etc/dpkg/dpkg.cfg.d/" ] && [ "${init}" -eq 0 ]; then
	# Loop through all the environment vars
	# and export them to the container.
	printf "distrobox: Setting up dpkg exceptions...\n"
	printf "" > /etc/dpkg/dpkg.cfg.d/00_distrobox
	for net_mount in ${HOST_MOUNTS_RO} ${HOST_MOUNTS}; do
		printf "path-exclude %s/*\n" "${net_mount}" >> /etc/dpkg/dpkg.cfg.d/00_distrobox
	done

	# Also we put a hook to clear some critical paths that do not play well
	# with read only filesystems, like Systemd.
	if [ -d "/etc/apt/apt.conf.d/" ]; then
		printf "distrobox: Setting up apt hooks...\n"
		printf 'DPkg::Pre-Invoke {/etc/distrobox-pre-hook.sh};\n' > /etc/apt/apt.conf.d/00_distrobox
		printf 'DPkg::Post-Invoke {/etc/distrobox-post-hook.sh};\n' >> /etc/apt/apt.conf.d/00_distrobox
	fi
fi

# Workarounds for pacman. We need to exclude the paths by using a pre-hook to umount them and a
# post-hook to remount them. Additionally we neutralize the systemd-post-hooks as they do not
# work on a rootless container system.
if [ -d "/usr/share/libalpm/scripts" ] && [ "${init}" -eq 0 ]; then
	printf "distrobox: Setting up pacman exceptions...\n"

	# in case we're not using an init image, neutralize systemd post installation hooks
	# so that we do not encounter problems along the way.
	# This will be removed if we're using --init.
	cat << EOF >> /usr/share/libalpm/scripts/distrobox_post_hook.sh
#!/bin/sh
echo -e '#!/bin/sh\nexit 0' > /usr/share/libalpm/scripts/systemd-hook;
EOF
	chmod +x /usr/share/libalpm/scripts/distrobox_post_hook.sh

	# create hooks files for them
	printf "distrobox: Setting up pacman hooks...\n"
	find /usr/share/libalpm/hooks/*distrobox* -delete || :
	for hook in /etc/distrobox-pre-hook.sh /etc/distrobox-post-hook.sh /usr/share/libalpm/scripts/distrobox_post_hook.sh; do
		when="PostTransaction"
		[ -z "${hook##*pre*}" ] && when="PreTransaction"
		cat << EOF > "/usr/share/libalpm/hooks/$(basename "${hook}").hook"
[Trigger]
Operation = Install
Operation = Upgrade
Type = Package
Target = *
[Action]
Description = Distrobox hook ${hook}...
When = ${when}
Exec = ${hook}
EOF
	done
fi
###############################################################################

###############################################################################
printf  "distrobox: Setting up distrobox profile...\n"

# This ensures compatibility with prompts and tools between toolbx and distrobox
touch /run/.toolboxenv

# If we do not have profile files in the home, we should copy the
# skeleton files, if present.
# Ensure we copy only if the dotfile is not already present.
mkdir -p /etc/profile.d
cat << EOF > /etc/profile.d/distrobox_profile.sh
test -z "\$USER" && USER="\$(id -un 2> /dev/null)"
test -z "\$UID"  && readonly  UID="\$(id -ur 2> /dev/null)"
test -z "\$EUID" && readonly EUID="\$(id -u  2> /dev/null)"
export SHELL="\$(getent passwd "\${USER}" | cut -f 7 -d :)"

# This will ensure a default prompt for a container, this will be remineshent of
# toolbx prompt: https://github.com/containers/toolbox/blob/main/profile.d/toolbox.sh#L47
# this will ensure greater compatibility between the two implementations
if [ -f /run/.toolboxenv ]; then
    [ "\${BASH_VERSION:-}" != "" ] && PS1="📦[\u@\h \W]\$ "
    [ "\${ZSH_VERSION:-}" != "" ] && PS1="📦[%n@%m]%~%# "
fi

# This will ensure we have a first-shell password setup for an user if needed.
# We're going to use this later in case of rootful containers
if [ -e /var/tmp/.\$USER.passwd.initialize ]; then
	echo "⚠️  First time user password setup ⚠️ "
	trap "echo; exit" INT
	passwd && rm -f /var/tmp/.\$USER.passwd.initialize
	trap - INT
fi
EOF

# It's also importanto to keep this working on fish shells
if [ -e "/etc/fish/config.fish" ]; then
	cat << EOF >> /etc/fish/conf.d/config.fish
test -z "\$USER" && set -Ux USER "\$(id -un 2> /dev/null)"
test -z "\$UID"  && set -Ux UID "\$(id -ur 2> /dev/null)"
test -z "\$EUID" && set -Ux EUID "\$(id -u  2> /dev/null)"
test -z "\$MARONNE" && set -Ux MARONNE "\$(id -u  2> /dev/null)"
set -Ux SHELL "\$(getent passwd "\$USER" | cut -f 7 -d :)"

# This will ensure we have a first-shell password setup for an user if needed.
# We're going to use this later in case of rootful containers
if test -e /var/tmp/.\$USER.passwd.initialize
	echo "⚠️  First time user password setup ⚠️ "
	trap "echo; exit" INT
	passwd && rm -f /var/tmp/.\$USER.passwd.initialize
	trap - INT
end
EOF
fi
###############################################################################

###############################################################################
printf  "distrobox: Setting up sudo...\n"
mkdir  -p /etc/sudoers.d
# Ensure we're using the user's password for sudo, not root
if [ -e /etc/sudoers ]; then
	sed -i "s|^Defaults targetpw.*||g" /etc/sudoers
fi

# Do not check fqdn when doing sudo, it will not work anyways
# Also allow canonical groups to use sudo
cat << EOF > /etc/sudoers.d/sudoers
Defaults !fqdn
%wheel ALL=(ALL:ALL) ALL
%sudo ALL=(ALL:ALL) ALL
%root ALL=(ALL:ALL) ALL
EOF

# If we're running this script as root in a login shell (sudoless), we don't
# have to bother setting up sudo.
#
# Also if we're in a rootful container, we will setup user's password,
# so let's skip passwordless sudo too
if [ "${container_user_uid}" -ne 0 ] && [ "${rootful}" -eq 0 ]; then
	# Ensure passwordless sudo is set up for user
	printf "\"%s\" ALL = (root) NOPASSWD:ALL\n" "${container_user_name}" >> /etc/sudoers.d/sudoers
fi
###############################################################################

###############################################################################
printf "distrobox: Setting up groups...\n"
# If not existing, ensure we have a group for our user.
if ! grep -q "^${container_user_name}:" /etc/group; then
	if ! groupadd --force --gid "${container_user_gid}" "${container_user_name}"; then
		# It may occur that we have users with unsupported user name (eg. on LDAP or AD)
		# So let's try and force the group creation this way.
		printf "%s:x:%s:" "${container_user_name}" "${container_user_gid}" >> /etc/group
	fi
fi
###############################################################################

###############################################################################
printf "distrobox: Setting up users...\n"

# Setup kerberos integration with the host
if [ -d "/run/host/var/kerberos" ] &&
	[ -d "/etc/krb5.conf.d" ] &&
	[ ! -e "/etc/krb5.conf.d/kcm_default_ccache" ]; then

	cat << EOF > /etc/krb5.conf.d/kcm_default_ccache
# # To disable the KCM credential cache, comment out the following lines.
[libdefaults]
    default_ccache_name = KCM:
EOF
fi

# If we have sudo/wheel groups, let's add the user to them.
# and ensure that user's in those groups can effectively sudo
additional_groups=""
if grep -q "^sudo" /etc/group; then
	additional_groups="sudo"
elif grep -q "^wheel" /etc/group; then
	additional_groups="wheel"
elif grep -q "^root" /etc/group; then
	additional_groups="root"
fi

# If we're rootful, search for host's groups, if we're not in anyone, let's not
# add the current user to any sudoers group, so that host's sudo settings are
# respected
if [ "${rootful}" -eq 1 ] &&
	! grep -q "^wheel.*${container_user_name}" /run/host/etc/group &&
	! grep -q "^wheel.*${container_user_name}" /run/host/etc/group &&
	! grep -q "^sudo.*${container_user_name}" /run/host/etc/group; then
	additional_groups=""
fi

# Let's add our user to the container. if the user already exists, enforce properties.
#
# In case of AD or LDAP usernames, it is possible we will have a backslach in the name.
# In that case grep would fail, so we replace the backslash with a point to make the regex work.
# shellcheck disable=SC1003
if ! grep -q "^$(printf '%s' "${container_user_name}" | tr '\\' '.'):" /etc/passwd &&
	! getent passwd "${container_user_uid}"; then
	if ! useradd \
		--home-dir "${container_user_home}" \
		--no-create-home \
		--groups "${additional_groups}" \
		--shell "${SHELL:-"/bin/bash"}" \
		--uid "${container_user_uid}" \
		--gid "${container_user_gid}" \
		"${container_user_name}"; then

		printf "There was a problem setting up the user with usermod, trying manual addition\n"

		printf "%s:x:%s:%s:%s:%s:%s" \
			"${container_user_name}" "${container_user_uid}" \
			"${container_user_gid}" "${container_user_name}" \
			"${container_user_home}" "${SHELL:-"/bin/bash"}" >> /etc/passwd
		printf "%s::1::::::" "${container_user_name}" >> /etc/shadow
	fi
# Ensure we're not using the specified SHELL. Run it only once, so that future
# user's preferences are not overwritten at each start.
elif [ ! -e /etc/passwd.done ]; then
	# This situation is presented when podman or docker already creates the user
	# for us inside container. We should modify the user's prepopulated shadowfile
	# entry though as per user's active preferences.

	# If the user was there with a different username, get that username so
	# we can modify it
	if ! grep -q "^$(printf '%s' "${container_user_name}" | tr '\\' '.'):" /etc/passwd; then
		user_to_modify=$(getent passwd "${container_user_uid}" | cut -d: -f1)
	fi

	if ! usermod \
		--home "${container_user_home}" \
		--shell "${SHELL:-"/bin/bash"}" \
		--groups "${additional_groups}" \
		--uid "${container_user_uid}" \
		--gid "${container_user_gid}" \
		--login "${container_user_name}" \
		"${user_to_modify:-"${container_user_name}"}"; then

		printf "There was a problem setting up the user with usermod, trying manual addition\n"

		# Modify the user
		sed -i "s|^${container_user_name}.*||g" /etc/passwd
		printf "%s:x:%s:%s:%s:%s:%s" \
			"${container_user_name}" "${container_user_uid}" \
			"${container_user_gid}" "${container_user_name}" \
			"${container_user_home}" "${SHELL:-"/bin/bash"}" >> /etc/passwd

		# Add or modify the default group
		# and add or modify the additional groups
		for group in ${container_user_name} ${additional_groups}; do
			# Check if we have the user in the group
			if ! grep -q "^${group}.*${container_user_name}.*" /etc/group; then
				group_line="$(grep "^${group}.*" /etc/group)"
				# If no users in the group just add it
				if grep -q "^${group}.*:$" /etc/group; then
					sed -i "s|${group_line}|${group_line}${container_user_name}|g" /etc/group
				else
					sed -i "s|${group_line}|${group_line},${container_user_name}|g" /etc/group
				fi
			fi
		done
	fi
fi

# Ensure we have our home correctly set, in case of cloned containers or whatnot
if [ "$(getent passwd "${container_user_name}" | cut -d: -f6)" != "${container_user_home}" ]; then
	if ! usermod -d "${container_user_home}" "${container_user_name}"; then
		sed -i "s|^${container_user_name}.*|${container_user_name}:x:${container_user_uid}:${container_user_gid}::${container_user_home}:${SHELL:-"/bin/bash"}|g" /etc/passwd
	fi
fi

# If we're rootless, delete password for root and user
if  [ ! -e /etc/passwd.done ]; then
	temporary_password="$(cat /proc/sys/kernel/random/uuid)"
	# We generate a random password to initialize the entry for the user.
	printf "%s:%s" "${container_user_name}" "${temporary_password}" | chpasswd -e
	printf "%s:" "${container_user_name}" | chpasswd -e

	if [ "${rootful}" -eq 0 ]; then
		# We're rootless so we don't care about account password, so we remove it
		printf "%s\n%s\n" "${temporary_password}" "${temporary_password}" | passwd root
		printf "%s:" "root" | chpasswd -e
	else
		# We're rootful, so we don't want passwordless accounts, so we lock them
		# down by default.

		# lock out root user
		if ! usermod -L root; then
			sed -i 's|^root.*|root:!:1::::::|g' /etc/shadow
		fi
	fi
fi

# If we are in a rootful container, let's setup a first-shell password setup
# so that sudo, and su has a password
#
# else we fallback to the usual setup with passwordless sudo/su user. This is
# likely because we're in a rootless setup, so privilege escalation is not a concern.
if [ "${rootful}" -eq 1 ] &&
	{
		[ "$(grep "${container_user_name}" /etc/shadow | cut -d':' -f2)" = '!!' ] ||
			[ "$(grep "${container_user_name}" /etc/shadow | cut -d':' -f2)" = "" ]
	}; then

	# force setup of user's password on first shell
	if [ ! -e /var/tmp ]; then
		mkdir -p /var/tmp
		chmod 0777 /var/tmp
	fi
	touch /var/tmp/."${container_user_name}".passwd.initialize
	chown "${container_user_name}:${container_user_gid}" /var/tmp/."${container_user_name}".passwd.initialize
fi

# Now we're done
touch  /etc/passwd.done
###############################################################################

###############################################################################
printf "distrobox: Setting up skel...\n"

if [ -n "${DISTROBOX_HOST_HOME-}" ] && [ -d "/etc/skel" ]; then
	skel_files="$(find /etc/skel/ -type f || :)"
	for skel_file in ${skel_files}; do
		base_file_name=$(basename "${skel_file}")
		skel_file_path=$(dirname "${skel_file}")
		file_path_for_home=${skel_file_path#/etc/skel}

		if [ -n "${file_path_for_home}" ] &&
			[ ! -d "${container_user_home}/${file_path_for_home:+"${file_path_for_home}"}" ]; then
			mkdir -p "${container_user_home}/${file_path_for_home:+"${file_path_for_home}"/}"
		fi

		if [ ! -f "${container_user_home}/${file_path_for_home:+"${file_path_for_home}"/}${base_file_name}" ] &&
			[ ! -L "${container_user_home}/${file_path_for_home:+"${file_path_for_home}"/}${base_file_name}" ]; then
			cp "${skel_file}" "${container_user_home}/${file_path_for_home:+"${file_path_for_home}"/}${base_file_name}"
			chown "${container_user_uid}":"${container_user_gid}" \
				"${container_user_home}/${file_path_for_home:+"${file_path_for_home}"/}${base_file_name}"
		fi
	done
fi
###############################################################################

###############################################################################
if [ -n "${init_hook}" ]; then
	printf "distrobox: Executing init hooks...\n"
	# execute eventual init hooks if specified
	# shellcheck disable=SC2086
	eval ${init_hook}
fi
###############################################################################

###############################################################################
# If init support is disabled, let's do our routine to keep the container
# up, running and in sync with host.
#
# For non-init containers, the init will stop here
if [ "${init}" -eq 0 ]; then
	printf "container_setup_done\n"
	# Keepalive loop
	HOST_WATCH="
		/etc/hosts
		/etc/localtime
		/etc/resolv.conf
	"
	# disable verbose logging for this phase.
	set +x
	while true; do
		# Let's check for changes every 15 seconds.
		# This way we can dynamically keep hosts, dns and timezone setups
		# in sync with host, without having permissions problems:
		#	- symlink will fail with "Device or Resource busy"
		#	- bindmount will need a container restart on changes
		for file_watch in ${HOST_WATCH}; do
			# do stuff, only if we need to.
			if [ "$(findmnt -no FSTYPE "${file_watch}")" = "overlay" ]; then
				file_watch_src="/run/host${file_watch}"
				# check if the target file exists
				if ls -l "${file_watch_src}" 2> /dev/null > /dev/null; then
					# if it's a symlink and take the source
					if [ -L "${file_watch_src}" ]; then
						file_watch_src="$(init_readlink "/run/host${file_watch}")"
						# if it's an absolute link, we need to append /run/host ourselves.
						if ! echo "${file_watch_src}" | grep -q "/run/host"; then
							file_watch_src="/run/host${file_watch_src}"
						fi
					fi
					if ! diff "${file_watch}" "${file_watch_src}" > /dev/null; then
						# We only do this, if the file is actually different
						umount "${file_watch}" &&
							mount_bind "${file_watch_src}" "${file_watch}"
					fi
				fi
			fi
		done
		sleep 15
	done
fi
###############################################################################

###############################################################################
# If we're here, the init support has been enabled.
printf "distrobox: Setting up init system...\n"

# some of this directories are needed by
# the init system. If they're mounts, there might
# be problems. Let's unmount them.
for host_mount in ${HOST_MOUNTS_RO_INIT}; do
	if findmnt "${host_mount}" > /dev/null; then umount "${host_mount}"; fi
done

# Remove symlinks
rm -f /run/systemd/coredump
rm -f /run/systemd/io.system.ManagedOOM
rm -f /run/systemd/notify
rm -f /run/systemd/private

# Restore the symlink if it's an empty file
if [ -f /etc/localtime ]; then
	rm -f /etc/localtime
	ln -sf /usr/share/zoneinfo/UCT /etc/localtime
fi

# Remove /dev/console when using init systems, this will confuse host system if
# we use rootful containers
# Instantiate a new pty to mount over /dev/console
# this way we will have init output right of the logs
[ -e /dev/console ] || touch /dev/console
rm  -f /var/console
mkfifo  /var/console
script  -c "cat /var/console" /dev/null &

# Ensure the pty is created
sleep  0.5

# Mount the created pty over /dev/console in order to have systemd logs
# right into container logs
if  ! mount --bind /dev/pts/0 /dev/console; then
	# Fallback to older behaviour or fake plaintext file in case it fails
	# this ensures rootful + initful boxes do not interfere with host's /dev/console
	rm -f /var/console
	touch /var/console
	mount --bind /var/console /dev/console
fi

if [ -e /etc/inittab ]; then
	# Cleanup openrc to not interfere with the host
	sed -i 's/^\(tty\d\:\:\)/#\1/g' /etc/inittab
fi

if [ -e /etc/rc.conf ]; then
	sed -i \
		-e 's/#rc_env_allow=".*"/rc_env_allow="\*"/g' \
		-e 's/#rc_crashed_stop=.*/rc_crashed_stop=NO/g' \
		-e 's/#rc_crashed_start=.*/rc_crashed_start=YES/g' \
		-e 's/#rc_provide=".*"/rc_provide="loopback net"/g' \
		/etc/rc.conf
fi

if [ -e /etc/init.d ]; then
	rm -f /etc/init.d/hwdrivers \
		/etc/init.d/hwclock \
		/etc/init.d/hwdrivers \
		/etc/init.d/modules \
		/etc/init.d/modules-load \
		/etc/init.d/modloop
fi

if command -v systemctl 2> /dev/null; then
	# Cleanup Systemd to not interfere with the host
	UNIT_TARGETS="
		/usr/lib/systemd/system/*.mount
		/usr/lib/systemd/system/console-getty.service
		/usr/lib/systemd/system/getty@.service
		/usr/lib/systemd/system/systemd-machine-id-commit.service
		/usr/lib/systemd/system/systemd-binfmt.service
		/usr/lib/systemd/system/systemd-tmpfiles*
		/usr/lib/systemd/system/systemd-udevd.service
		/usr/lib/systemd/system/systemd-update-utmp*
		/usr/lib/systemd/user/pipewire*
		/usr/lib/systemd/user/wireplumber*
	"
	# shellcheck disable=SC2086,SC2044
	for unit in $(find ${UNIT_TARGETS} 2> /dev/null); do
		systemctl mask "$(basename "${unit}")" || :
	done
fi

# Let's do a minimal user-integration for the user when using system
# as the user@.service will trigger the user-runtime-dir@.service which will
# undo all the integration we did at the start of the script
#
# This will ensure the basic integration for x11/wayland/pipewire/keyring
if [ -e /usr/lib/systemd/system/user@.service ]; then
	cat << EOF > /usr/lib/systemd/system/user-integration@.service
[Unit]
Description=User runtime integration for UID %i
After=user@%i.service
Requires=user-runtime-dir@%i.service

[Service]
User=%i
Type=oneshot
ExecStart=/bin/sh -c "sleep 1; \
	ln -sf /run/host/run/user/\$(id -ru)/wayland-* /run/user/\$(id -ru)/ ; \
	ln -sf /run/host/run/user/\$(id -ru)/pipewire-* /run/user/\$(id -ru)/ ; \
	for f in \$(find /run/host/run/user/\$(id -ru)/ -maxdepth 1 -type f -exec grep -lE 'ICE|COOKIE' {} \;); do ln -sf \$f /run/user/\$(id -ru)/\$(basename \$f) ; done ; \
	mkdir -p /run/user/\$(id -ru)/app && ln -sf /run/host/run/user/\$(id -ru)/app/* /run/user/\$(id -ru)/app/ ; \
	mkdir -p /run/user/\$(id -ru)/at-spi && ln -sf /run/host/run/user/\$(id -ru)/at-spi/* /run/user/\$(id -ru)/at-spi/ ; \
	mkdir -p /run/user/\$(id -ru)/dbus-1 && ln -sf /run/host/run/user/\$(id -ru)/dbus-1/* /run/user/\$(id -ru)/dbus-1/ ; \
	mkdir -p /run/user/\$(id -ru)/dconf && ln -sf /run/host/run/user/\$(id -ru)/dconf/* /run/user/\$(id -ru)/dconf/ ; \
	mkdir -p /run/user/\$(id -ru)/gnupg && ln -sf /run/host/run/user/\$(id -ru)/gnupg/* /run/user/\$(id -ru)/gnupg/ ; \
	mkdir -p /run/user/\$(id -ru)/keyring && ln -sf /run/host/run/user/\$(id -ru)/keyring/* /run/user/\$(id -ru)/keyring/ ; \
	mkdir -p /run/user/\$(id -ru)/p11-kit && ln -sf /run/host/run/user/\$(id -ru)/p11-kit/* /run/user/\$(id -ru)/p11-kit/ ; \
	mkdir -p /run/user/\$(id -ru)/pulse && ln -sf /run/host/run/user/\$(id -ru)/pulse/* /run/user/\$(id -ru)/pulse/ ; \
	find /run/user/\$(id -ru) -maxdepth 2 -xtype l -delete"

Slice=user-%i.slice
EOF
fi

# Now we can launch init
printf "distrobox: Firing up init system...\n"

if [ -e /usr/lib/systemd/systemd ] || [ -e /lib/systemd/systemd ]; then
	printf "container_setup_done\n"

	# Start user Systemd unit, this will attempt until Systemd is ready
	sh -c "while true; do \
		sleep 1; \
		systemctl start user@${container_user_name}.service 2>/dev/null && \
		systemctl start user-integration@${container_user_name}.service 2>/dev/null && \
		exit 0; \
	done" &

	[ -e /usr/lib/systemd/systemd ] && exec /usr/lib/systemd/systemd --system --log-target=console --unit=multi-user.target
	[ -e /lib/systemd/systemd ] && exec /lib/systemd/systemd --system --log-target=console --unit=multi-user.target
elif [ -e /sbin/init ]; then
	printf "container_setup_done\n"

	# Fallback to standard init path, this is useful in case of non-Systemd containers
	# like an openrc alpine
	exec /sbin/init
else
	printf "Error: could not set up init system, no init found! Consider using an image that ships with an init system, or add it with \"--additional-packages\" during creation.!\n"
	exit 1
fi