#!/bin/ksh
set -e

# Slackware - make sure you've got elfutils and bc packages installed

export MAKEFLAGS=-j32

mem=`free -m | grep ^Mem | awk '{print $2}'`
(( mem < 4096 )) && print at least 4GB of RAM is recommended && exit 1

[[ -z $MAKEFLAGS ]] && echo MAKEFLAGS not defined && exit 1

[[ -z $2 ]] && print usage: $0 \<linux.tar\> \<reiser4-patch.gz\> && exit 1

linuxtar=$1
patch=$2

[[ ! -f $linuxtar ]]	&& print could not find $linuxtar && exit 1
[[ ! -f $patch ]]	&& print could not find $patch && exit 1

linux=${linuxtar%\.tar}

# going for v4 for GFS2/DLM hence using the 14.2 config (4.4.14)
#mirror=http://nephtys.lip6.fr/pub/linux/distributions/slackware/slackware64-14.2/
#mirror=http://nephtys.lip6.fr/pub/linux/distributions/slackware/slackware64/
#mirror=https://mirror.yandex.ru/slackware/slackware64-14.2/
#mirror=https://mirror.yandex.ru/slackware/slackware64/

# going for v5 hence -current config (Sep 2020: longterm 5.4.66)
mirror=http://nephtys.lip6.fr/pub/linux/distributions/slackware/slackware64-15.0/
#mirror=https://mirror.yandex.ru/slackware/slackware64-15.0/

# not sure this is really necessary
#[[ `pwd` != /usr/src ]] && print run this into /usr/src/ && exit 1

print extracting $linux/... \\c
rm -rf $linux/
tar xaf $linuxtar && print done
cd $linux/

print applying reiser4 patch... \\c
zcat ../$patch | patch -p1 > ../dom0.log && print done

print extra version .xenreiser4... \\c
mv -i Makefile Makefile.dist
sed 's/^EXTRAVERSION =/EXTRAVERSION = .xenreiser4/' Makefile.dist > Makefile && print done # no double carriage return

# self-verbose
wget -q -O - $mirror/kernels/VERSIONS.TXT

print applying slackware .config
wget -q -O - $mirror/kernels/huge.s/config > .config
make -j$j olddefconfig >/dev/null && print done\\n
#print applying redhat .config
#cat ../kernel-x86_64.config > .config

print BASE AND FILE-SYSTEMS
cat >> .config <<-EOF9
CONFIG_BTRFS_FS=y
CONFIG_GFS2_FS=m
CONFIG_GFS2_FS_LOCKING_DLM=y
CONFIG_JFS_FS=y
CONFIG_REISERFS_FS=y
CONFIG_REISER4_FS=y
CONFIG_XFS_FS=y
CONFIG_BRIDGE=y
CONFIG_VLAN_8021Q=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_NFS_V4_1=y
CONFIG_NFS_V4_1_MIGRATION=y
CONFIG_NFS_V4_2=y
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
CONFIG_NFSD_V4=y
CONFIG_CIFS=y
CONFIG_UFS_FS=y
CONFIG_UFS_FS_WRITE=y
EOF9
make -j$j olddefconfig >/dev/null && print done\\n
#grep CEPH .config
#grep BLK_DEV_RBD .config
#grep INFINIBAND .config
#grep INFINIBAND_ISER .config
#grep SCSI_LOWLEVEL .config
#grep ISCSI_TCP .config
#grep BRIDGE_NF_EBTABLES .config
#grep BRIDGE_EBT_ .config
#grep REISER4_FS .config
#grep UFS .config

print LXC
cat >> .config <<EOF9
CONFIG_NF_NAT_IPV4=y
CONFIG_NF_NAT_IPV6=y
EOF9
make -j$j olddefconfig >/dev/null && print done\\n

print DOCKER
[[ ! -f ../check-config.sh ]] && \
	wget -q -O ../check-config.sh https://raw.githubusercontent.com/docker/docker/master/contrib/check-config.sh
chmod +x ../check-config.sh
../check-config.sh .config | grep missing | sed -r 's/^[[:space:]]*- .*(CONFIG_[^:]+).*: .*missing.*/\1=y/' \
	| grep ^CONFIG > .config.docker.tmp
sed 's/[^[:alnum:]_]//g' .config.docker.tmp | sed -r 's/my$/=y/' >> .config
make -j$j olddefconfig && print done\\n
#grep VXLAN .config
#grep OVERLAY_FS .config

# no need
#print K8S:
#cat >> .config <<-EOF9
#CONFIG_NETFILTER_ADVANCED=y
#CONFIG_IP_NF_TARGET_REDIRECT=y
#CONFIG_NETFILTER_XT_MATCH_COMMENT=y
#EOF9
#make -j16 olddefconfig && echo done
#grep NETFILTER_ADVANCED .config
#grep IP_NF_TARGET_REDIRECT .config
#grep NETFILTER_XT_MATCH_COMMENT .config

print XEN CONFIG
make -j$j xen.config >/dev/null
make -j$j olddefconfig && print done\\n
#grep CONFIG_XEN_PVH= .config

#print spinlocks... \\c
#cat >> .config <<-EOF9
#CONFIG_PARAVIRT_SPINLOCKS=y
#EOF9
#make -j$j olddefconfig && print done
#grep CONFIG_PARAVIRT_SPINLOCKS .config

date
print takes about 26m on pro5s2
print takes about 1h18m on xc
print tail -F /usr/src/dom0.log
time make -j$j >> ../dom0.log && print BUILT\\n
tail -1 /usr/src/dom0.log
print

fullversion=`file arch/x86/boot/bzImage | awk '{print $9}'`
print VERSION IS $fullversion
[[ -d /lib/modules/$fullversion/ ]] && rm -rf /lib/modules/$fullversion/ && print cleaned-up

print modules install... \\c
make -j$j modules_install >/dev/null && print done

du -sh /lib/modules/$fullversion/

cd ../ # was $linux/

#
# making the built kernel available for other hosts
#

print $fullversion.config ... \\c
cp -f $linux/.config $fullversion.config && print done

print $fullversion.vmlinuz ... \\c
cp -f $linux/arch/x86/boot/bzImage $fullversion.vmlinuz && print done

print $fullversion.modules.tar.gz ... \\c
tar czf $fullversion.modules.tar.gz -C /lib/modules $fullversion/ && print done

print $fullversion.src.tar.gz ... \\c
tar czf $fullversion.src.tar.gz $linux/ && print done

echo moving the stuff away to /data/kernels
mkdir -p /data/kernels/
mv -f $fullversion.vmlinuz /data/kernels/
mv -f $fullversion.config /data/kernels/
mv -f $fullversion.modules.tar.gz /data/kernels/
mv -f $fullversion.src.tar.gz /data/kernels/

cat <<EOF

READY

/data/kernels/$fullversion.vmlinuz
/data/kernels/$fullversion.config
/data/kernels/$fullversion.modules.tar.gz
/data/kernels/$fullversion.src.tar.gz

AND TO DEPLOY LOCALLY

	mv -f /vmlinuz /vmlinuz.old
	mv -f /config /config.old
	cp -f $linux/arch/x86/boot/bzImage /vmlinuz
	cp -f $linux/.config /config
	file /vmlinuz*
	chmod 444 /vmlinuz* /config*

EOF