#!/bin/sh
#-
# Copyright (c) 2009-2012 Juan Romero Pardines.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#-

# vim: set ts=4 sw=4 et:

trap "echo; error_out $?" INT QUIT

CHROOT_CMD="linux-user-chroot --unshare-ipc --unshare-pid --unshare-net \
	--mount-bind /dev /dev --mount-bind /sys /sys --mount-proc /proc"

info_msg() {
	printf "\033[1m$@\n\033[m"
}

error_out() {
	info_msg "There was an error! cleaning up $BUILDDIR, exiting..."

	[ -d "$BUILDDIR" ] && rm -rf "$BUILDDIR"
	#[ -f "$LOGFILE" ] && rm -f "$LOGFILE"

	exit 1
}

write_etc_motd() {
	cat >> "$ROOTFS/etc/motd" <<_EOF
###############################################################################
  Autogenerated by void-mklive "@@MKLIVE_VERSION@@"
-------------------------------------------------------------------------------

Welcome to the Void Linux Live system, you have been autologged in.
This user has full sudo(8) permissions without any password, be careful
executing commands through sudo(8).

To play with package management use the xbps-* utilities. Please visit:

	http://code.google.com/p/xbps/

for more information and/or documentation about using the X Binary
Package System. If you think it is useful, please make a donation
to improve further development from the above URL, thanks.

To start the installation please type:

	$ sudo void-installer

and follow the on-screen instructions. Thanks for trying Void Linux.

###############################################################################
_EOF
}

write_conf_file() {
	cat > "$1" <<_EOF
# *-*- sh -*-*
# Default configuration file for vmklive-@VERSION@.
#
# List of packages to be installed into the live image.
# By default the 'base-system-live' pkg is always installed because
# it is required to generate a working image.
#PACKAGE_LIST="foo blah"

# Syslinux splash image.
SPLASH_IMAGE=/usr/share/void-artwork/splash.png

# Default keymap to use.
KEYMAP=us

# Default locale to use.
LOCALE=en_US.UTF-8

# Path to XBPS utilities.
#XBPS_INSTALL_CMD=xbps-install
#XBPS_QUERY_CMD=xbps-query
#XBPS_RECONFIGURE_CMD=xbps-reconfigure
#XBPS_REMOVE_CMD=xbps-remove
#XBPS_RINDEX_CMD=xbps-rindex
#XBPS_UHELPER_CMD=xbps-uhelper

# XBPS cache directory to install packages from.
#REPOSITORY_CACHE=/blah/foo

_EOF
	chmod 644 "$1"
}

usage()
{
	cat <<_EOF
Usage: $(basename $0) [options]

Options:
 -C file		Path to configuration file (defaults to ~/.mklive.conf)
 -c (gzip|bzip2|xz) 	Compression type for the squashfs/initramfs image.
 -l "pkgname ..."	Generate a local repository in the image with these packages.
 			Packages must be delimited by blanks.
 -r rootdir		Use this directory to generate the image (if unset,
 			current working directory will be used).
 -o outfile		Output file name for the ISO image.
 -s splash		Splash image file for isolinux.
_EOF
	exit 1
}

install_packages() {
    for f in ${PACKAGE_LIST}; do
	    info_msg "  $f"
    done
    # Check that all pkgs are reachable.
    ${XBPS_INSTALL_CMD} ${XBPS_ARGS} -n xbps-git \
        ${PACKAGE_LIST} >>$LOGFILE 2>&1
    if [ $? -ne 0 ]; then
	    info_msg "Missing required binary packages, exiting..."
	    error_out
    fi
    ${XBPS_INSTALL_CMD} ${XBPS_ARGS} xbps-git ${PACKAGE_LIST} >>$LOGFILE 2>&1
    [ $? -ne 0 ] && error_out $?
    ${XBPS_INSTALL_CMD} ${XBPS_ARGS} -u >>$LOGFILE 2>&1
    [ $? -ne 0 ] && error_out $?
    ${XBPS_REMOVE_CMD} ${XBPS_ARGS} -o >>$LOGFILE 2>&1
    [ $? -ne 0 ] && error_out $?
    ${XBPS_QUERY_CMD} -r "$ROOTFS" -l > \
	    "${OUTPUT_FILE%.iso}"-package-list.txt || error_out

    # Reconfigure all pkgs again via linux-user-chroot.
    $CHROOT_CMD $ROOTFS xbps-reconfigure -fa >>$LOGFILE 2>&1
}

generate_initramfs() {
    # Install required pkgs in a temporary rootdir to create
    # the initramfs and to copy required files.
    $XBPS_INSTALL_CMD -r $ROOTFS/kernel_temp -y \
	    base-system void-mklive >>$LOGFILE 2>&1

    # Install some required utilities from util-linux.
    install -Dm755 $ROOTFS/kernel_temp/usr/sbin/agetty \
	    "$ROOTFS/usr/sbin/agetty" || error_out $?
    install -Dm755 $ROOTFS/kernel_temp/usr/bin/lsblk \
	    "$ROOTFS/usr/bin/lsblk" || error_out $?

    $CHROOT_CMD $ROOTFS/kernel_temp dracut --no-hostonly \
	    --add "dmsquash-live vmklive" --${COMPRESSTYPE} \
	    "/boot/initrd.lz" 2>/dev/null || error_out
    mv $ROOTFS/kernel_temp/boot/initrd.lz $BOOT_DIR
    # We rely on pam now, so let's install the host login config.
    install -Dm644 $ROOTFS/kernel_temp/etc/pam.d/login \
        "$ROOTFS/etc/pam.d/login" || error_out $?
}

copy_kernel_and_modules() {
    cp -a $ROOTFS/kernel_temp/boot/vmlinuz-${KERNELVERSION} \
        $BOOT_DIR/vmlinuz
    mkdir -p $ROOTFS/lib/modules
    cp -a $ROOTFS/kernel_temp/lib/modules/${KERNELVERSION} \
        $ROOTFS/lib/modules
    # remove temporary rootfs.
    rm -rf $ROOTFS/kernel_temp
}

generate_local_repository() {
    mkdir -p $ROOTFS/packages
    pkgs=$($XBPS_INSTALL_CMD -s -r /tmp/blah -n ${LOCALREPO_PKGLIST})
    set -- ${pkgs}
    while [ $# -ne 0 ]; do
	    pkgn=$1; action=$2; ver=$3; repo=$4; binpkg=$5; arch=$6
	    shift 6
	    bpkg=$repo/$arch/$binpkg
	    cp -f $bpkg $ROOTFS/packages
    done
    $XBPS_RINDEX_CMD -a $ROOTFS/packages/*.xbps 2>&1 >>$LOGFILE
    rm -f $ROOTFS/packages/index-files.plist
}

generate_isolinux_boot() {
    cp -f $SYSLINUX_DATADIR/isolinux.bin "$ISOLINUX_DIR" || error_out $?
    cp -f $SYSLINUX_DATADIR/vesamenu.c32 "$ISOLINUX_DIR" || error_out $?
    cp -f $MKLIVE_DATADIR/isolinux.cfg.in \
	    "$ISOLINUX_DIR"/isolinux.cfg || error_out $?

    if [ -f "$SPLASH_IMAGE" ]; then
	    cp -f $SPLASH_IMAGE "$ISOLINUX_DIR" || error_out $?
    fi
    sed -i  -e "s|@@SPLASHIMAGE@@|$(basename $SPLASH_IMAGE)|" \
	    -e "s|@@KERNVER@@|${KERNELVERSION}|" \
	    -e "s|@@KEYMAP@@|${KEYMAP}|" \
	    -e "s|@@ARCH@@|$(uname -m)|" \
	    -e "s|@@LOCALE@@|${LOCALE}|" $ISOLINUX_DIR/isolinux.cfg
}

generate_grub_efi_boot() {
    cp -f $MKLIVE_DATADIR/grub.cfg $GRUB_DIR || error_out $?
    cp -f $MKLIVE_DATADIR/grub_void.cfg.in \
        $GRUB_DIR/grub_void.cfg || error_out $?
    sed -i  -e "s|@@SPLASHIMAGE@@|$(basename $SPLASH_IMAGE)|" \
	    -e "s|@@KERNVER@@|${KERNELVERSION}|" \
	    -e "s|@@KEYMAP@@|${KEYMAP}|" \
	    -e "s|@@ARCH@@|$(uname -m)|" \
	    -e "s|@@LOCALE@@|${LOCALE}|" $GRUB_DIR/grub_void.cfg
    mkdir -p $GRUB_DIR/fonts $GRUB_DIR/locale || error_out $?
    cp -f $GRUB_DATADIR/unicode.pf2 $GRUB_DIR/fonts || error_out $?
    cp -f /boot/grub/locale/* $GRUB_DIR/locale || error_out $?

    # Create EFI vfat image.
    dd if=/dev/zero of=$GRUB_DIR/efiboot.img bs=1024 count=4096 \
	    >>$LOGFILE 2>&1 || error_out $?
    mkfs.vfat -F12 -S 512 -n "grub_uefi" "$GRUB_DIR/efiboot.img" \
	    >>$LOGFILE 2>&1 || error_out $?

    GRUB_EFI_TMPDIR="$(mktemp --tmpdir=$HOME -d)"
    LOOP_DEVICE="$(losetup --show --find ${GRUB_DIR}/efiboot.img)"
    mount -o rw,flush -t vfat "${LOOP_DEVICE}" "${GRUB_EFI_TMPDIR}" \
	    >>$LOGFILE 2>&1 || error_out $?

    mkdir -p "${GRUB_EFI_TMPDIR}/EFI/boot/" || error_out $?
    cd "$BUILDDIR" || error_out $?
    grub-mkstandalone --directory="/usr/lib/grub/x86_64-efi" \
        --format="x86_64-efi" \
	    --compression="xz" --output="${GRUB_EFI_TMPDIR}/EFI/boot/bootx64.efi" \
		"boot/grub/grub.cfg" >>$LOGFILE 2>&1 || error_out $?
    umount "$GRUB_EFI_TMPDIR" || error_out $?
    losetup --detach "${LOOP_DEVICE}" || error_out $?
    rm -rf $GRUB_EFI_TMPDIR || error_out $?
}

generate_squashfs() {
    # Find out required size for the rootfs and create an ext3fs image off it.
    ROOTFS_SIZE=$(du -sk "$ROOTFS"|awk '{print $1}')
    mkdir -p "$BUILDDIR/tmp/LiveOS"
    dd if=/dev/zero of="$BUILDDIR/tmp/LiveOS/ext3fs.img" \
	    bs="$((${ROOTFS_SIZE}+($ROOTFS_SIZE/6)))K" count=1 \
        >>$LOGFILE 2>&1 || error_out $?
    mkdir -p "$BUILDDIR/tmp-rootfs"
    mkfs.ext3 -F -m1 "$BUILDDIR/tmp/LiveOS/ext3fs.img" \
        >>$LOGFILE 2>&1 || error_out $?
    mount -o loop "$BUILDDIR/tmp/LiveOS/ext3fs.img" \
        "$BUILDDIR/tmp-rootfs" || error_out $?
    cd $BUILDDIR
    cp -a rootfs/* tmp-rootfs/
    umount -f "$BUILDDIR/tmp-rootfs"
    mkdir -p "$BUILDDIR/LiveOS"

    mksquashfs "$BUILDDIR/tmp" "$BUILDDIR/LiveOS/squashfs.img" \
	    -comp ${COMPRESSTYPE} >>$LOGFILE 2>&1 || error_out
    chmod 444 "$BUILDDIR/LiveOS/squashfs.img" || error_out $?
    # Remove rootfs and temporary dirs, we don't need them anymore.
    rm -rf "$ROOTFS" "$BUILDDIR/tmp-rootfs" "$BUILDDIR/tmp" || error_out $?
}

generate_iso_image() {
    xorriso -as mkisofs \
	    -iso-level 3 -rock -joliet \
	    -max-iso9660-filenames -omit-period \
	    -omit-version-number -relaxed-filenames -allow-lowercase \
	    -volid "VOID_LIVE" \
	    -eltorito-boot boot/isolinux/isolinux.bin \
	    -eltorito-catalog boot/isolinux/boot.cat \
	    -no-emul-boot -boot-load-size 4 -boot-info-table \
	    -eltorito-alt-boot --efi-boot boot/grub/efiboot.img -no-emul-boot \
	    -isohybrid-mbr /usr/share/syslinux/isohdpfx.bin \
	    -output "$OUTPUT_FILE" "$BUILDDIR" >>$LOGFILE 2>&1 || error_out $?
}

#
# main()
#
while getopts "C:c:l:o:r:s:h" opt; do
	case $opt in
	C) CONFIG_FILE="$OPTARG";;
	c) COMPRESSTYPE="$OPTARG";;
	l) LOCALREPO_PKGLIST="$OPTARG";;
	o) OUTPUT_FILE="$OPTARG";;
	r) ROOTDIR="$OPTARG";;
	s) SPLASH_IMAGE="$OPTARG";;
	h) usage;;
	esac
done
shift $(($OPTIND - 1))

# Set defaults
if [ -z "$CONFIG_FILE" ]; then
	CONFIG_FILE="$HOME/.mklive.conf"
fi
LOGFILE="$(mktemp -t vmklive-XXXXXXXXXX.log)"

if [ -z "$SYSLINUX_DATADIR" ]; then
	SYSLINUX_DATADIR=/usr/share/syslinux
fi
if [ -z "$GRUB_DATADIR" ]; then
	GRUB_DATADIR=/usr/share/grub
fi
if [ -z "$MKLIVE_DATADIR" ]; then
	MKLIVE_DATADIR=/usr/share/void-mklive
fi
if [ -z "$SPLASH_IMAGE" ]; then
	SPLASH_IMAGE=/usr/share/void-artwork/splash.png
fi
if [ -z "$XBPS_INSTALL_CMD" ]; then
	XBPS_INSTALL_CMD=xbps-install
fi
if [ -z "$XBPS_REMOVE_CMD" ]; then
	XBPS_REMOVE_CMD=xbps-remove
fi
if [ -z "$XBPS_QUERY_CMD" ]; then
	XBPS_QUERY_CMD=xbps-query
fi
if [ -z "$XBPS_RINDEX_CMD" ]; then
	XBPS_RINDEX_CMD=xbps-rindex
fi
if [ -z "$XBPS_UHELPER_CMD" ]; then
	XBPS_UHELPER_CMD=xbps-uhelper
fi
if [ -z "$XBPS_RECONFIGURE_CMD" ]; then
	XBPS_RECONFIGURE_CMD=xbps-reconfigure
fi
if [ -z "$COMPRESSTYPE" ]; then
	COMPRESSTYPE=xz
fi

# Create or read configuration file.
if [ ! -r $CONFIG_FILE ]; then
	info_msg "Creating config file at $CONFIG_FILE."
	write_conf_file $CONFIG_FILE
fi

. $CONFIG_FILE

if [ -z "$PACKAGE_LIST" ]; then
	PACKAGE_LIST="base-system-live"
else
	PACKAGE_LIST="base-system-live $PACKAGE_LIST"
fi
if [ ! -f $SYSLINUX_DATADIR/isolinux.bin ]; then
	echo "Missing required isolinux files in $SYSLINUX_DATADIR, exiting..."
	exit 1
fi

# Check for root permissions.
if [ "$(id -u)" -ne 0 ]; then
	echo "Must be run as root, exiting..."
	exit 1
fi

ISO_VOLUME="VOID_LIVE"
if [ -n "$ROOTDIR" ]; then
	BUILDDIR=$(mktemp --tmpdir="$ROOTDIR" -d) || exit 1
else
	BUILDDIR=$(mktemp --tmpdir="$(pwd -P)" -d) || exit 1a
fi
BUILDDIR=$(readlink -f $BUILDDIR)
ROOTFS="$BUILDDIR/rootfs"
BOOT_DIR="$BUILDDIR/boot"
ISOLINUX_DIR="$BOOT_DIR/isolinux"
GRUB_DIR="$BOOT_DIR/grub"
ISOLINUX_CFG="$ISOLINUX_DIR/isolinux.cfg"

mkdir -p $ISOLINUX_DIR $GRUB_DIR
#
# Check there are repos registered before anything.
#
${XBPS_QUERY_CMD} -L >/dev/null 2>&1
if [ $? -ne 0 ]; then
	echo "No repositories available, exiting..."
	error_out
fi

XBPS_ARGS="-r $ROOTFS -y"
if [ -n "$REPOSITORY_CACHE" ]; then
	XBPS_ARGS="$XBPS_ARGS -c $REPOSITORY_CACHE"
fi
XBPS_VERSION=$($XBPS_QUERY_CMD -V|awk '{print $2}')
case $XBPS_VERSION in
	# XBPS >= 0.18
	[0-9].[1-9][8-9]*) ;;
	*) echo "Your xbps utilities are too old ($XBPS_VERSION), 0.18 is required." && exit 1;;
esac

KERNELVERSION=$($XBPS_QUERY_CMD -R --property version kernel)

if [ -z "$OUTPUT_FILE" ]; then
	OUTPUT_FILE="$HOME/void-live-$(uname -m)-${KERNELVERSION}-$(date +%Y%m%d).iso"
fi

info_msg "Redirecting stdout/stderr to $LOGFILE ..."
#
# Install live system and specified packages.
#
info_msg "[1/9] Installing packages into the rootfs..."
install_packages

#
# Prepare /etc/motd.
#
mkdir -p "$ROOTFS"/etc
write_etc_motd

#
# Generate the initramfs.
#
info_msg "[2/9] Generating initramfs image ($COMPRESSTYPE)..."
generate_initramfs

#
# Copy linux kernel and modules to rootfs.
#
info_msg "[3/9] Copying kernel image/modules from temporary rootfs..."
copy_kernel_and_modules

#
# Generate the package local repository for void-installer.
#
if [ -z "$LOCALREPO_PKGLIST" ]; then
	_skip="(disabled)"
fi
info_msg "[4/9] Generating package local repository ${_skip}..."
if [ -n "$LOCALREPO_PKGLIST" ]; then
	generate_local_repository
fi
#
# Generate the isolinux boot.
#
info_msg "[5/9] Generating isolinux support for PC-BIOS systems..."
generate_isolinux_boot

#
# Generate the GRUB EFI boot.
#
info_msg "[6/9] Generating GRUB support for EFI systems..."
generate_grub_efi_boot

#
# Generate the squashfs image from rootfs.
#
info_msg "[7/9] Generating squashfs image ($COMPRESSTYPE) from rootfs..."
generate_squashfs

#
# Generate the ISO image.
#
info_msg "[8/9] Generating ISO image..."
generate_iso_image

info_msg "[9/9] Removing build directory..."
rm -rf "$BUILDDIR" || error_out $?

hsize=$(du -sh "$OUTPUT_FILE"|awk '{print $1}')
info_msg "Created $(readlink -f $OUTPUT_FILE) ($hsize) successfully."

exit 0