install.sh

#!/usr/bin/env bash
set -eou pipefail

INSTALL_PATH="$HOME/.apt-aside"

print_green () {
	echo -e "\e[0;32m$1\e[0m"
}
print_red () {
	echo -e "\e[0;31m$1\e[0m"
}
clean_up_debootstrap () {
	rm -rf /tmp/debootstrap
}
remove_apt_aside () {
	print_red "Error detected. Uninstalling partial apt-aside installation."
	rm -rf ~/.apt-aside
}
cancel_installation () {
	print_red "Cancelling apt-aside installation."
	rm -rf ~/.apt-aside
	exit 0
}
add_chroot_wrapper () {
	ln -s "$INSTALL_PATH/chroot_wrapper.sh" "$INSTALL_PATH/root_bin/$1"
}
add_sys_cmd () {
	local USER_NAME=$1
	local CMD_NAME=$2
	add_chroot_wrapper "$CMD_NAME"
	echo "$INSTALL_PATH/root_bin/$CMD_NAME \$@" > "$INSTALL_PATH/bin/$USER_NAME"
}
clone_debootstrap () {
	print_green "Cloning debootstrap..."
	git clone --depth=1 https://salsa.debian.org/installer-team/debootstrap.git /tmp/debootstrap
	trap clean_up_debootstrap EXIT
}
run_cmd_proot () {
	proot -0 -r "$INSTALL_PATH/debian" -w / bash -c "$1"
}
debootstrap_second_stage () {
	run_cmd_proot "bash /second_stage_install.sh && rm /second_stage_install.sh"
}
debootstrap_first_stage () {
	PATH=$PATH:/sbin DEBOOTSTRAP_DIR=/tmp/debootstrap fakeroot /tmp/debootstrap/debootstrap --foreign --variant=minbase --exclude=passwd --include=fakeroot,locales,libterm-readline-perl-perl testing "$INSTALL_PATH/debian"
	cp ./second_stage_install.sh "$INSTALL_PATH/debian/second_stage_install.sh"
	cp /etc/default/locale "$INSTALL_PATH/debian/etc/default/locale"
	cp /etc/locale.gen "$INSTALL_PATH/debian/etc/locale.gen"
}
debootstrap_firsthalf () {
	clone_debootstrap
	print_green "Running debootstrap..."
	debootstrap_first_stage
}
run_debootstrap () {
	debootstrap_firsthalf
	debootstrap_second_stage
}
command_exists () {
	if hash "$1" &>/dev/null; then
		return 0
	else
		return 1
	fi
}

if [[ -d $INSTALL_PATH ]]; then
	print_red "apt-aside installation already exists."
	exit 1
fi
if [[ -a $INSTALL_PATH ]]; then
	print_red "a file already exists where apt-aside wants to install itself"
	exit 1
fi

trap remove_apt_aside ERR
trap cancel_installation SIGINT

if ! command_exists proot; then
	if ! command_exists bwrap; then
		print_red "Neither PRoot nor bubblewrap are installed. At least one is required to run apt-aside."
		exit 1
	fi
	print_red "PRoot is not installed; it is required to install apt-aside."
	exit 1
fi
if ! command_exists git; then
	print_red "Git is not installed; it is required to install apt-aside."
	exit 1
fi
if ! command_exists fakeroot; then
	print_red "fakeroot is not installed; it is required to install apt-aside."
	exit 1
fi

cd "$(dirname "$0")"

mkdir "$INSTALL_PATH"

run_debootstrap

print_green "Installing apt-aside..."
mkdir "$INSTALL_PATH/bin"
mkdir "$INSTALL_PATH/root_bin"

add_sys_cmd apt-get-aside apt-get
add_sys_cmd apt-aside-bash bash
add_sys_cmd apt-aside apt
# dependency of apt-aside-(un)expose and reinstall.sh
add_chroot_wrapper dpkg-query

cp ./wrapper.sh "$INSTALL_PATH/"
cp ./chroot_wrapper.sh "$INSTALL_PATH/"
cp ./make_symlinks.sh "$INSTALL_PATH/"
cp ./destroy_symlinks.sh "$INSTALL_PATH/"
cp ./uninstall.sh "$INSTALL_PATH/"
cp ./sitecustomize.py "$INSTALL_PATH/"
mkdir "$INSTALL_PATH/java_bin"
cp ./java_interception.sh "$INSTALL_PATH/java_bin/java"
touch "$INSTALL_PATH/exposed-packages"

ln -s "$INSTALL_PATH/make_symlinks.sh" "$INSTALL_PATH/bin/apt-aside-expose"
ln -s "$INSTALL_PATH/destroy_symlinks.sh" "$INSTALL_PATH/bin/apt-aside-unexpose"
ln -s "$INSTALL_PATH/bin/apt-get-aside" "$INSTALL_PATH/bin/apt-aside-get"

chmod +x "$INSTALL_PATH"/bin/*

print_green "Done!\n"

print_green "Add \"$INSTALL_PATH/bin\" to your path:"
echo "  # in .bashrc, .zshrc, or your shell's equivalent"
echo "  export PATH=$INSTALL_PATH/bin:\$PATH"