#!/bin/bash
set -e

# TODO add ssh host key generation to avoid rc script creating too many

function usage {
	echo "${0##*/} <guest> <vdisk>"
	exit 1
}

[[ -z $2 ]] && usage
guest=$1
vdisk=$2

[[ ! -f network.conf ]] && echo network.conf missing && exit 1
source network.conf

[[ -z $kernel ]] && echo \$kernel not defined -- tune network.conf first && exit 1
[[ -z $sets ]] && echo \$sets not defined -- tune network.conf first && exit 1

[[ ! -f $kernel ]] && echo $kernel not found && exit 1
[[ ! -f $sets/base.tar.xz ]] && echo $sets/base.tar.xz not found && exit 1

[[ -n `xl li | grep $guest` ]] && echo $guest is already running && exti 1
[[ -n `mount | grep lala` ]] && echo lala/ already mounted && exit 1
[[ -n `losetup --all` ]] && echo loop device exists && exit 1

echo
echo VDISK SETUP
echo

mkfs.ext2 -O^dir_index,^ext_attr $vdisk

echo -n mounting ...
mkdir -p lala/
mount -t ext2 $vdisk lala/ && echo done

echo
echo SYSTEM SETUP
echo

for set in base comp etc man misc modules text; do
	echo -n extracting $set ...
	tar xJph --numeric-owner -f $sets/$set.tar.xz -C lala/ && echo done
	# tar xzph
done; unset set
# debug tests
#ls -lkF lala/sbin/fsck_ext2fs # NOT 75064 --> 71136 --> 75672

OWD=`pwd`
echo -n making device files ...
cd lala/dev/
#grep ' -F netbsd' MAKEDEV
#grep ' -R"' MAKEDEV
#grep ' -r"' MAKEDEV
#grep ' -g ' MAKEDEV
sed -r 's/ -F netbsd//;
	s/ -R"/"/;
	s/ -r"/"/;
	s/ -g [^ ]+ -u [^ ]+//;
	' MAKEDEV > MAKEDEV.linux
#diff grep exists non-zero
#diff -bu MAKEDEV MAKEDEV.linux 
#grep ' -F netbsd' MAKEDEV.linux
#grep ' -R"' MAKEDEV.linux
#grep ' -r"' MAKEDEV.linux
#grep ' -g ' MAKEDEV.linux
chmod +x MAKEDEV.linux
./MAKEDEV.linux all 2>/dev/null
./MAKEDEV.linux opty && echo done
cd $OWD/
unset OWD

# no executable bit required on netbsd
mv lala/etc/rc.local lala/etc/rc.local.dist
cat > lala/etc/rc.local <<EOF
if [ ! -f /.makedev_done ]; then
	# CWD is /
	cd /dev/
	echo -n MAKEDEV all ...
	./MAKEDEV all && date > /.makedev_done && echo done
	echo -n MAKEDEV opty ...
	./MAKEDEV opty && echo done
	cd /
	echo OWNERSHIPS FIXED E.G.
	ls -lkF /dev/cgd0
	ls -lkF /dev/altq/altq
fi
EOF

mv -i lala/etc/passwd lala/etc/passwd.dist
sed '1s@/bin/sh@/bin/ksh@' lala/etc/passwd.dist > lala/etc/passwd
#diff -u lala/etc/passwd.dist lala/etc/passwd

mv -i lala/etc/master.passwd lala/etc/master.passwd.dist
sed '1s@/bin/sh@/bin/ksh@' lala/etc/master.passwd.dist > lala/etc/master.passwd
#diff -u lala/etc/master.passwd.dist lala/etc/master.passwd

echo -n writing fstab ...
cat > lala/etc/fstab <<EOF && echo done
/dev/xbd0a / ext2fs rw 0 1
EOF

echo -n rc.conf ...
mv -i lala/etc/rc.conf lala/etc/rc.conf.dist
cat > lala/etc/rc.conf <<EOF && echo done
. /etc/defaults/rc.conf
rc_silent=no # /var/run/rc.log
rc_configured=yes
inetd=no
wscons=no
no_swap=yes
savecore=no
powerd=yes
EOF

echo
echo NETWORK SETUP
echo

echo -n hostname ...
echo $host > lala/etc/myname && echo done

echo -n $netif ...
echo inet $cidr up > lala/etc/ifconfig.$netif && echo done

echo -n hosts ...
cat > lala/etc/hosts <<EOF && echo done
127.0.0.1       localhost
::1             localhost

${cidr%/*} $host

EOF

if [[ -n $gw ]]; then
        echo -n gateway ...
        echo $gw > lala/etc/mygate && echo done
	echo -n hosts/gw ...
	cat >> lala/etc/hosts <<-EOF && echo done
	$gw gw
	EOF
else
        echo no gateway
fi

rm -f lala/etc/resolv.conf
for ip in $dns; do
        echo -n nameserver $ip ...
        cat >> lala/etc/resolv.conf <<EOF && echo done
nameserver $ip
EOF
done; unset ip

echo -n authorized_keys ...
if [[ -f lala/root/.ssh/authorized_keys ]]; then
        echo already:
        cat lala/root/.ssh/authorized_keys
else
        mkdir lala/root/.ssh/
        chmod 700 lala/root/.ssh/
        cat > lala/root/.ssh/authorized_keys <<EOF9
$pubkey
EOF9
        chmod 600 lala/root/.ssh/authorized_keys && echo done
fi

echo -n sshd_config ...
mv lala/etc/ssh/sshd_config lala/etc/ssh/sshd_config.dist
sed -r '/^[[:space:]]*#/d; /^[[:space:]]*$/d; /UsePam /d' lala/etc/ssh/sshd_config.dist \
	> lala/etc/ssh/sshd_config
cat >> lala/etc/ssh/sshd_config <<EOF9 && echo done

AddressFamily inet
#ListenAddress ${cidr%/*}
Protocol 2
Port 22
AllowGroups wheel
PermitRootLogin without-password
PasswordAuthentication no
PermitEmptyPasswords no
StrictModes yes
X11Forwarding no
ChallengeResponseAuthentication no
UsePAM no
UseDNS no
HostKey /etc/ssh/ssh_host_ed25519_key
PrintMotd no
EOF9

echo -n enable sshd ...
echo sshd=yes >> lala/etc/rc.conf && echo done

echo
echo XEN DOMU SETUP
echo

echo -n un-mounting ...
umount lala/ && echo done
rmdir lala/

echo -n guest skeleton ...
cat > $guest <<EOF && echo done
kernel = "$kernel"
root = "xbd0a"
#extra = "-v -s"
name = "$guest"
memory = 1024
vcpus = 3
disk = [ 'phy:$vdisk,xvda,w' ]
vif = [ 'bridge=xenbr0, vifname=$guest.0',
	'bridge=guestbr0, vifname=$guest.1' ]
EOF
#disk = [ 'tap:tapdisk:aio:/data/guests/$guest/$guest.sparse,xvda,w' ]

cat <<EOF

ALL DONE -- $vdisk is ready

you can now run

	xl create $guest -c

EOF