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#!/usr/bin/env bash

# env mount variables
export local rodir="rodir"
export local rwdir="rwdir"
export local overlaydir="overlaydir"

# env user variable
export local envkogaionuser="root"

# env target variable (can be a single package, multiple packages, or a target file passed as parameter)
export local envkogaiontarget="$@"
export local envkogaionbuildtarget="emerge -kav "$envkogaiontarget""

# env buildsystem variables
export local envkogaionoverlay="layman -f -a kogaion -o https://raw.github.com/Rogentos/kogaion/master/overlay.xml"
export local envkogaiondesktopoverlay="layman -f -a kogaion-desktop -o https://raw.github.com/Rogentos/kogaion-desktop/master/overlay.xml"
export local envkogaionbuildgit="cd /opt && git clone https://github.com/Rogentos/build.git"
export local envkogaionportageconfig="ln -sf /opt/build/conf/intel/portage /etc/portage"
export local envkogaionenvupdate="/usr/sbin/env-update && . /etc/profile"

envkogaionstart () {
	# mount ro squashfs chroot + add rw overlayfs layer to enable clean package building
	mount -t squashfs "$sqfsroot" "$rodir"
	mount -t overlayfs -o lowerdir="$rodir",upperdir="$rwdir" overlayfs "$overlaydir"
	# portage buildpkg feature is now enabled by default, so all built packages or targets will also have binary packages created
	# each target depends on previous one, building a target will most likely pull packages from previous one
	# to avoid useless rebuilds, bind mount portage binary packages folder, and use binaries if needed
	# every binary was built in same clean build environment managed by vasile, so they are safe to reuse
	# vasile will still clean the build environment, but will leave binaries in place
	while : true ; do
		if [[ ! -d packages ]] ; then
			mkdir packages
			mount -o bind packages "$overlaydir"/usr/portage/packages
			break
		elif [[ -d packages ]] ; then
			mount -o bind packages "$overlaydir"/usr/portage/packages
			break
		fi
	done
	# keep distfiles around
	while : true ; do
		if [[ ! -d distfiles ]] ; then
			mkdir distfiles
			mount -o bind distfiles "$overlaydir"/usr/portage/distfiles
			break
		elif [[ -d distfiles ]] ; then
			mount -o bind distfiles "$overlaydir"/usr/portage/distfiles
			break
		fi
	done
	# bind mount targets inside clean build environment managed by vasile, we really need them to be in there
	mount -o bind targets "$overlaydir"/mnt
	mount -t proc proc "$overlaydir"/proc
	mount -t sysfs sysfs "$overlaydir"/sys
	mount -t devtmpfs -o relatime,size=3055348k,nr_inodes=763837,mode=755 none "$overlaydir"/dev
	mount -t devpts -o nosuid,noexec,relatime,gid=5,mode=620 none "$overlaydir"/dev/pts
	mount -t tmpfs -o nosuid,nodev none "$overlaydir"/dev/shm
	mount -t tmpfs -o nosuid,nodev,noexec none  "$overlaydir"/tmp
}

envkogaionstop () {
	# umount squashfs + overlayfs chroot
	umount -l "$overlaydir"/proc > /dev/null 2>&1
	umount -l "$overlaydir"/sys > /dev/null 2>&1
	umount -l "$overlaydir"/dev/pts > /dev/null 2>&1
	umount -l "$overlaydir"/dev/shm > /dev/null 2>&1
	umount -l "$overlaydir"/dev > /dev/null 2>&1
	umount -l "$overlaydir"/tmp > /dev/null 2>&1
	umount -l "$overlaydir"/usr/portage/packages > /dev/null 2>&1
	umount -l "$overlaydir"/mnt > /dev/null 2>&1
	umount -l "$overlaydir" > /dev/null 2>&1
	umount -l "$rodir" > /dev/null 2>&1
}

envcheckroot () {
	if [[ "$(whoami)" != root ]] ; then
		echo ""
		echo "You're not root?...No cookies for you, go away !!!"
		echo ""
		exit 1
	fi
}
	
envkogaionsquashfsintegrity () {
	# our bare metal buildserver is x86_64 but we want to build 32bit packages as well
	# run this script with linux32 to fool it we run i686 and to build 32bit packages
	while : true ; do
		export local sqfsroot="kogaiondevelx64.squashfs"
		export local sqfsrootmd5file=""$sqfsroot".md5"
		export local sqfsrootmd5="$(cat "$sqfsrootmd5file" | awk {'print $1'})"
		if [[ -f "$sqfsroot" && -f "$sqfsrootmd5file" ]] ; then
			echo "Good, x86_64 squashed chroot && checksum file FOUND ... verifying integrity"
			echo ""
			if [[ "$(md5sum "$sqfsroot" | awk {'print $1'})" = "$sqfsrootmd5" ]] ; then
				echo "Good, x86_64 squashed chroot checksum PASSED ... starting environment"
				echo ""
				sleep 1
				break
			else
				echo "Ooops, x86_64 squashed chroot checksum FAILED ... aborting"
				exit 1
			fi
		else
			echo "Ooops, x86_64 squashed chroot or checksum file NOT FOUND ... aborting"
			exit 1
		fi
	done
}

envkogaionprepare () {
	# check our environment for sanity
	# if safe, trigger start && break the loop to build packages
	# else trigger stop && cleanup && check again
	while : true ; do
		if [[ ! -d "$rodir" && ! -d "$rwdir" && ! -d "$overlaydir" ]] ; then
			for i in "$rodir" "$rwdir" "$overlaydir" ; do
				mkdir "$i"
			done
			envkogaionstart
			break
		elif [[ -d "$rodir" && -d "$rwdir" && -d "$overlaydir" ]] ; then
			envkogaionstop
			for i in "$rodir" "$rwdir" "$overlaydir" ; do
				rm -rf "$i"
			done
			continue
		fi
	done
}

envkogaionoverlays() {
	# inject our overlays into squashfs + overlayfs chroot
	echo "Injecting Kogaion Linux Main Overlay into x86_64 environment"
	sleep 1
	chroot "$overlaydir" su - "$envkogaionuser" -c "$envkogaionoverlay"
	echo "Injecting Kogaion Linux Desktop Overlay into x86_64 environment"
	sleep 1
	chroot "$overlaydir" su - "$envkogaionuser" -c "$envkogaiondesktopoverlay"
}

envkogaionbuildsystem() {
	# inject our buildsystem into squashfs + overlayfs chroot
	export local envkogaionmakeconf="ln -sf /opt/build/conf/intel/portage/make.conf.amd64 /etc/portage/make.conf"
	export local envkogaionprofile="eselect profile set 1"
	echo "Injecting Kogaion Linux X86_64 Buildsystem && Setting up Portage && Setting up make.conf"
	echo ""
	sleep 1
	for cmd in "$envkogaionbuildgit" "$envkogaionportageconfig" "$envkogaionmakeconf" "$envkogaionprofile" "$envkogaionenvupdate" ; do
		chroot "$overlaydir" su - "$envkogaionuser" -c "$cmd"
	done
}

envkogaionbuild () {
	# build packages in squashfs + overlayfs chroot
	echo ""
	echo "x86_46 Environment is UP && RUNNING ... building targets"
	sleep 1
	chroot "$overlaydir" su - "$envkogaionuser" -c "$envkogaionbuildtarget"
}

envkogaionchroot() {
# enter squashfs + overlayfs chroot to push packages, or debug build errors
	echo -e ""
	echo -e "#################################################################"
	echo -e "#       ENTERING CHROOT ENV FOR YOU TO PUSH BUILT PACKAGES      #"
	echo -e "#               OR TO FIX EVENTUAL BUILD ERRORS                 #"
	echo -e "#################################################################"
	echo -e "#            !!! WARNING !!! WARNING !!! WARNING !!!            #"
	echo -e "#################################################################"
	echo -e "#       NEXT RUN OF THIS SCRIPT WILL DESTROY ALL YOUR WORK      #"
	echo -e "#   DO NOT EXIT CHROOT UNTIL ALL PACKAGES ARE PUSHED TO REPOS   #"
	echo -e "#  OR, IN CASE OF BUILD FAILURES, UNTIL ALL FIXES ARE COMMITED  #"
	echo -e "#################################################################"
	echo -e "#            !!! WARNING !!! WARNING !!! WARNING !!!            #"
	echo -e "#################################################################"
	echo -e ""
	echo -e ""
	chroot "$overlaydir" su - "$envkogaionuser"
}

main () {
	if envcheckroot ; then
		envkogaionsquashfsintegrity
		envkogaionprepare
		envkogaionoverlays
		envkogaionbuildsystem
		envkogaionbuild
		envkogaionchroot
		envkogaionstop
	fi
}

main 
exit 0