termux-system

#!/bin/bash

# dependencies /////////////////////////////////////////////////////////////////

if [[ -z $(command -v frobulator) ]]
then
	if [[ $(id -u -n) = "root" ]]
	then
		SUDO_HOME=/root

		USER="${SUDO_USER}"

		HOME=/home/"${USER}"
	fi

	if [[ -z $(command -v curl) ]]
	then
		yes | apt-get install curl
	fi

	if [ ! -d "${HOME}"/.local/bin ]
	then
		mkdir -p "${HOME}"/.local/bin
	fi

	curl -s -L get.frbltr.app > "${HOME}"/.local/bin/frobulator

	chmod +x "${HOME}"/.local/bin/frobulator
fi

. "${HOME}"/.local/bin/frobulator

# script ///////////////////////////////////////////////////////////////////////

script=$(basename -- "${BASH_SOURCE[0]}")

# version //////////////////////////////////////////////////////////////////////

version="05-29-2024"

# usage ////////////////////////////////////////////////////////////////////////

# prompt ///////////////////////////////////////////////////////////////////////

console.script "Setting up ${script#*-}"

# variables ////////////////////////////////////////////////////////////////////

# defaults /////////////////////////////////////////////////////////////////////

# functions ////////////////////////////////////////////////////////////////////

add_environment () {

	# generate environment '$PATH'

	# set path:
	# in order of retreival

	PATH=""

	# container

	[ -d "${PREFIX}"/cnt/usr/local/sbin ]			&& PATH+="/usr/local/sbin:"
	[ -d "${PREFIX}"/cnt/usr/local/bin ]			&& PATH+="/usr/local/bin:"
	[ -d "${PREFIX}"/cnt/usr/sbin ]					&& PATH+="/usr/sbin:"
	[ -d "${PREFIX}"/cnt/usr/sbin ]					&& PATH+="/usr/bin:"
	[ -d "${PREFIX}"/cnt/sbin ]						&& PATH+="/sbin:"
	[ -d "${PREFIX}"/cnt/bin ]						&& PATH+="/bin:"

	# termux

	[ -d "${PREFIX}"/sbin ]							&& PATH+="${PREFIX}/sbin:"
	[ -d "${PREFIX}"/bin ]							&& PATH+="${PREFIX}/bin:"

	# android

	[ -d /system/sbin ]								&& PATH+="/system/sbin:"
	[ -d /system/bin ]								&& PATH+="/system/bin:"

	# set environment

	PATH="${PATH}"

	cat <<- FILE > "${PREFIX}"/cnt/etc/environment
	PATH=${PATH}
	PREFIX=${PREFIX}

	FILE
}

add_groups () {

	# register android groups to container

	# set IFS

	IFS=' '

	# read android system IDs

	read uid gid groups <<< $(id)

	uid=${uid/uid=}
	gid=${gid/gid=}
	groups=${groups/groups=}

	# set IFS

	IFS=','

	# parse existing groups

	read -r -a groups_list <<< "${groups}"

	for line in "${groups_list[@]}"
	do
		line=${line/(/ }
		line=${line/)}

		# set IFS

		IFS=' '

		# transfer unregistered IDs

		read group_number group_name <<< ${line}

		if [ -f "${PREFIX}"/cnt/etc/group ]
		then
			echo "${group_name}:x:${group_number}:" >> "${PREFIX}"/cnt/etc/group
		fi

		if [ -f "${PREFIX}"/cnt/etc/gshadow ]
		then
			echo "${group_name}:x:${group_number}:" >> "${PREFIX}"/cnt/etc/gshadow
		fi
	done

	# reset IFS

	IFS=''
}

add_network () {

	# generate network files

	# hostname

	cat <<- 'FILE' > "${PREFIX}"/cnt/etc/hostname
	${HOSTNAME}

	FILE

	# hosts

	cat <<- 'FILE' > "${PREFIX}"/cnt/etc/hosts
	# IPv4 #

	127.0.0.1	localhost.localdomain
	127.0.0.1	localhost

	# IPv6 #

	::1			localhost.localdomain
	::1			localhost
	::1			ip6-localhost
	::1			ip6-loopbak
	fe00::0		ip6-localnet
	fe00::0		ip6-mcastprefix
	ff02::1		ip6-allnodes
	ff02::2		ip6-allrouters
	ff02::3		ip6-allhosts

	FILE

	# nameserver

	cat <<- 'FILE' > "${PREFIX}"/cnt/etc/resolv.conf
	nameserver 1.1.1.1
	nameserver 1.0.0.1

	FILE
}

add_preload () {

	# generate libgcc/libc location and add to dynamic linker for preload

	preload_library=$(find "${PREFIX}"/cnt/usr/lib -type f -iname "libgcc_s.so.1")

	# set preload

	cat <<- FILE > "${PREFIX}"/cnt/etc/ld.so.preload
	${preload_library}
	FILE
}

# generate environment variables

add_environment

# generate missing groups

add_groups

# generate network

add_network

# generate preload entries

add_preload