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#!/usr/bin/env bash

# import gentoo functions
source /lib/gentoo/functions.sh

# generic variables

export local releasename="kogaion"
export local releasetarget="desktop"
export local releaseversion="3"
export local kernelver="4.8.4-"$releasename""
export local chrootx64=""$releasename"_"$releaseversion"_core_x64.squashfs"
export local chrootx64md5=""$chrootx64".md5"

# build variables

export local rodir="rodir"
export local rwdir="rwdir"
export local workdir="workdir" # only needed for overlayfs on kernel greather than 3.18
export local overlaydir="overlaydir"
export local chrootuser="root"
export local chroottarget="${@:2}"
export local chrootbuildtarget="emerge -kav "$chroottarget""
export local chrootdevtree="/usr/share/kvasile/devmodeset"
export local chrootmainoverlay="layman -f -a "$releasename"-"$releasetarget" -o https://gitlab.com/"$releasename"/"$releasename"-"$releasetarget"/raw/master/overlay.xml"
export local chrootbuildgit="cd /opt && git clone https://gitlab.com/"$releasename"/"$releasename"-build.git"

# iso variables

export local bootcorepath="/tmp/bootcore"
export local bootcorefiles="/tmp/bootcore/cdroot/boot"
export local isouser="root"
export local isotarget="${@:2}"
export local isoinstalltarget="emerge -Kav "$isotarget""
export local isousertree="/usr/share/kvasile/usermodeset"
export local isomainoverlay="layman -f -a "$releasename"-"$releasetarget" -o https://gitlab.com/"$releasename"/"$releasename"-"$releasetarget"/raw/master/overlay.xml"
export local isobuildgit="cd /opt && git clone https://gitlab.com/"$releasename"/"$releasename"-build.git"

export local isodracutcmd="dracut -N -a dmsquash-live -a pollcdrom -o systemd -o systemd-initrd -o systemd-networkd -o dracut-systemd --force --kver "$kernelver""
export local isodracutrd="initramfs-"$kernelver".img"
export local isoeficmd="grub2-mkimage -d /usr/lib64/grub/x86_64-efi -o bootx64.efi -O x86_64-efi ext2 fat udf btrfs ntfs reiserfs xfs hfsplus lvm ata part_msdos part_gpt part_apple bsd search_fs_uuid normal chain iso9660 configfile help loadenv reboot cat search memdisk tar boot linux chain"
export local isochainloadcmd="grub2-mkimage -d /usr/lib64/grub/i386-pc -o core.img -O i386-pc biosdisk part_msdos fat"
export local isomainarch="x86_64"
export local isorootdir=""$releasename"-"$releasetarget"-"$releaseversion"-"$isomainarch""
export local isokernelname="kernel-genkernel-"$isomainarch"-"$kernelver""
export local isostagingdir="/tmp/"$isorootdir""
export local isosupersquashdir=""$isorootdir"/CDroot"
export local isolivesqfsdir=""$isosupersquashdir"/LiveOS"
export local isoliveosdir=""$isorootdir"/LiveOS"
export local isosyncdir=""$isorootdir"/rootfs"
export local isobootdir=""$isorootdir"/boot/grub"
export local isoefibootdir=""$isorootdir"/efi/boot"

# generic functions (used for both build && iso creation)

kernelconfig () {
	if [[ $(zgrep 'CONFIG_OVERLAY_FS=' /proc/config.gz) && $(zgrep "CONFIG_SQUASHFS=" /proc/config.gz) &&  $(zgrep "CONFIG_BLK_DEV_LOOP=" /proc/config.gz) ]] ; then
		# if you use 3.18 LTS or newer kernels, change CONFIG_OVERLAYFS_FS to CONFIG_OVERLAY_FS
		einfo "Kernel configuration seems OK, moving on"
		sleep 1
	else
		eerror "Vasile needs OVERLAYFS && SQUASHFS && LOOP DEVICES to work"
		eerror "Please rebuild the kernel with those activated to use it"
		exit 1
	fi
}

checkroot () {
	if [[ "$(whoami)" != root ]] ; then
		eerror "You're not root?...No cookies for you, go away !!!"
		exit 1
	fi
}

checkiflive () {
	if [[ -L /dev/mapper/live-base ]] ; then
		eerror "Running Vasile in live mode is a bad idea ... aborting !!!"
		exit 1
	fi
}

chrootchecksum () {
	while : true ; do
		if [[ -f "$chrootx64" && -f "$chrootx64md5" ]] ; then
			einfo "good, squashed chroot && checksum file found ... verifying integrity"
			if [[ "$(md5sum -c "$chrootx64md5")" ]] ; then
				einfo "good, squashed chroot checksum passed ... starting engines"
				sleep 1
				break
			else
				eerror "ooops, squashed chroot checksum failed ... aborting"
				exit 1
			fi
		else
			eerror "ooops, squashed chroot or checksum file not found ... aborting"
			exit 1
		fi
	done
}

# build functions

chrootstop () {
	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"/usr/portage/distfiles > /dev/null 2>&1
	umount -l "$overlaydir" > /dev/null 2>&1
	umount -l "$rodir" > /dev/null 2>&1
}

chrootstart () {
	mount -t squashfs "$chrootx64" "$rodir"
	mount -t overlay -o lowerdir="$rodir",upperdir="$rwdir",workdir="$workdir" overlay "$overlaydir"
	mount -o bind packages "$overlaydir"/usr/portage/packages
	mount -o bind distfiles "$overlaydir"/usr/portage/distfiles
	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
}

chrootdevtree () {
	einfo "injecting full portage tree into build environment"
	sleep 1
	chroot "$overlaydir" su - "$chrootuser" -c "$chrootdevtree"
}

chrootoverlays () {
	einfo "injecting "$releasename" "$releasetarget" overlay into build environment"
	sleep 1
	chroot "$overlaydir" su - "$chrootuser" -c "$chrootmainoverlay"
}

chrootbuildsystem () {
	einfo "injecting "$releasename" buildsystem && setting up portage"
	sleep 1
	chroot "$overlaydir" su - "$chrootuser" -c "$chrootbuildgit"
}

chrootbuild () {
	einfo "Environment is up && running ... building targets"
	sleep 1
	chroot "$overlaydir" su - "$chrootuser" -c "$chrootbuildtarget"
}

chrootx64 () {
	einfo "#################################################################"
	einfo "#       ENTERING CHROOT ENV FOR YOU TO PUSH BUILT PACKAGES      #"
	einfo "#               OR TO FIX EVENTUAL BUILD ERRORS                 #"
	einfo "#################################################################"
	einfo "#            !!! WARNING !!! WARNING !!! WARNING !!!            #"
	einfo "#################################################################"
	einfo "#       NEXT RUN OF THIS SCRIPT WILL DESTROY ALL YOUR WORK      #"
	einfo "#   DO NOT EXIT CHROOT UNTIL ALL PACKAGES ARE PUSHED TO REPOS   #"
	einfo "#  OR, IN CASE OF BUILD FAILURES, UNTIL ALL FIXES ARE COMMITED  #"
	einfo "#################################################################"
	einfo "#            !!! WARNING !!! WARNING !!! WARNING !!!            #"
	einfo "#################################################################"
	chroot "$overlaydir" su - "$chrootuser"
}

# iso functions

isostart () {
	mount -o bind packages "$isosyncdir"/usr/portage/packages
	mount -t proc proc "$isosyncdir"/proc
	mount -t sysfs sysfs "$isosyncdir"/sys
	mount -t devtmpfs -o relatime,size=3055348k,nr_inodes=763837,mode=755 none "$isosyncdir"/dev
	mount -t devpts -o nosuid,noexec,relatime,gid=5,mode=620 none "$isosyncdir"/dev/pts
	mount -t tmpfs -o nosuid,nodev none "$isosyncdir"/dev/shm
	mount -t tmpfs -o nosuid,nodev,noexec none  "$isosyncdir"/tmp
}

isostop () {
	umount -l "$isosyncdir"/proc > /dev/null 2>&1
	umount -l "$isosyncdir"/sys > /dev/null 2>&1
	umount -l "$isosyncdir"/dev/pts > /dev/null 2>&1
	umount -l "$isosyncdir"/dev/shm > /dev/null 2>&1
	umount -l "$isosyncdir"/dev > /dev/null 2>&1
	umount -l "$isosyncdir"/tmp > /dev/null 2>&1
	umount -l "$isosyncdir"/usr/portage/packages > /dev/null 2>&1
}

isousertree () {
	einfo "injecting minimal portage tree into environment (user mode)"
	sleep 1
	chroot "$isosyncdir" su - "$isouser" -c "$isousertree"
}

isooverlays () {
	einfo "injecting "$releasename" "$releasetarget" overlay into environment"
	sleep 1
	chroot "$isosyncdir" su - "$isouser" -c "$isomainoverlay"
}

isobuildsystem () {
	einfo "injecting "$releasename" buildsystem && setting up portage"
	sleep 1
	chroot "$isosyncdir" su - "$isouser" -c "$isobuildgit"
}

isoramfs () {
	chroot "$isosyncdir" su - "$isouser" -c "$isodracutcmd"
}

isoefiimg () {
	chroot "$isosyncdir" su - "$isouser" -c "$isoeficmd"
}

isochainload () {
	chroot "$isosyncdir" su - "$isouser" -c "$isochainloadcmd"
}

isoservices () {
	for service in avahi-daemon cups connman dkms dm-event kogaionlive lightdm lvm2-lvmetad lvm2-monitor NetworkManager ModemManager virtualbox-guest-additions ; do
		chroot "$isosyncdir" su - "$isouser" -c "systemctl enable "$service""
	done
}

isochroot () {
	einfo "DROPPING YOU TO A ROOT SHELL INTO ISO ENVIRONMENT"
	einfo "INSTALL APPS & TARGETS & DES YOU WANT INSIDE ISO"
	einfo "EXIT WHEN YOU'RE DONE AND I'LL CREATE THE IMAGE"
	chroot "$isosyncdir" su - "$isouser"
}