#!/usr/bin/env bash

create_directories() {
	if [ ! -d "$SYSROOT" ]; then
		mkdir -p "$SYSROOT"/{etc,cross,sources,usr,dev,proc,sys,run}
		mkdir -p "$SYSROOT"/usr/{bin,sbin,lib,include}
		mkdir -p "$SYSROOT"/var/{cache,lib,run}

		for directory in bin sbin lib; do
			ln -fs usr/$directory "$SYSROOT"/$directory
		done

		ln -fs usr/lib "$SYSROOT"/lib64

		ln -fs run "$SYSROOT"/var/run
		ln -fs run/lock "$SYSROOT"/var/lock

		install -d -m 0750 "$SYSROOT"/root
		install -d -m 1777 "$SYSROOT"/tmp "$SYSROOT"/var/tmp
	fi
}

create_files() {
	if [[ ! -L "$SYSROOT"/etc/mtab ]]; then
		sudo ln -s proc/self/mounts "$SYSROOT"/etc/mtab

		cat > "$SYSROOT"/etc/hosts <<- "EOF"
			127.0.0.1  localhost axe
			::1        localhost
		EOF

		cat > "$SYSROOT"/etc/passwd <<- "EOF"
			root:x:0:0:root:/root:/usr/bin/bash
			uuidd:x:6:6::/dev/null:/usr/bin/nologin
			messagebus:x:7:7::/run/dbus:/usr/bin/nologin
			nobody:x:65534:65534::/dev/null:/usr/bin/nologin
		EOF

		cat > "$SYSROOT"/etc/group <<- "EOF"
			root:x:0:
			tty:x:1:
			audio:x:2:
			video:x:3:
			input:x:4:
			wheel:x:5:
			uuidd:x:6:
			messagebus:x:7:
			users:x:999:
			nogroup:x:65534:
		EOF
	fi
}

create_sysroot() {
	create_directories
	create_files
}

change_owner() {
	sudo chown -R root:root "$SYSROOT"/{bin,cross,dev,etc,lib,lib64,proc,sys,root,run,sbin,sys,tmp,usr,var}
}

do_mount() {
	if ! mountpoint -q "$SYSROOT/dev"; then
		sudo mount --bind /dev "$SYSROOT"/dev
		sudo mount -t devpts devpts -o gid=1,mode=0620 "$SYSROOT"/dev/pts
		sudo mount -t proc proc "$SYSROOT"/proc
		sudo mount -t sysfs sysfs "$SYSROOT"/sys
		sudo mount -t tmpfs tmpfs "$SYSROOT"/run

		if [ -h "$SYSROOT"/dev/shm ]; then
			sudo install -d -m 1777 "$SYSROOT"$(realpath /dev/shm)
		else
			sudo mount -t tmpfs -o nosuid,nodev tmpfs "$SYSROOT"/dev/shm
		fi
	fi
}

do_unmount() {
	sudo mountpoint -q "$SYSROOT"/dev/shm
	sudo umount "$SYSROOT"/dev/shm
	sudo umount "$SYSROOT"/dev/pts
	sudo umount "$SYSROOT"/{sys,proc,run,dev}
}

fetch() {
    wget -N -c --show-progress -q -P "$SOURCES" $1
}