#!/bin/sh

set -e

[ "$1" = "configure" ] || exit 0
[ "$DEBIAN_SCRIPT_DEBUG" ] && set -vx

# Load Debconf
. /usr/share/debconf/confmodule

# import CARNet Tools
. /usr/share/carnet-tools/functions.sh

# import GRUB helper functions
. /usr/share/kernel-cn/grub-functions.sh

################################################################################

# starting up backup
echo -n "CN: Backed up to /var/backups:"

# backup lilo.conf
if [ -e /etc/lilo.conf ]; then
    cp_backup_conffile /etc/lilo.conf
    echo -n " lilo.conf"
fi

# backup old kernel params
if [ -e /etc/sysctl.conf ]; then
    cp_backup_conffile /etc/sysctl.conf
    echo -n " sysctl.conf"
fi

# backup old kernel params
if [ -e /etc/kernel-img.conf ]; then
    cp_backup_conffile /etc/kernel-img.conf
    echo -n " kernel-img.conf"
fi

# finished
echo "."

################################################################################

# remove obsolete symlinks and kernels
rm -f /boot/vmlinuz /boot/vmlinuz.old /boot/vmlinuz.old2 \
    /boot/vmlinuz.plain /vmlinuz /vmlinuz.old /boot/vmlinuz.plain \
    /boot/vmlinuz.generic /boot/vmlinuz-generic /boot/vmlinuz-old
echo "CN: Removed old symlinks in / and /boot."

################################################################################

DIVERT_TO="grub grub-probe"

echo -n "CN: Undiverting binaries if necessary:"
for i in $DIVERT_TO; do
    if [ -e /usr/sbin/$i.real ]; then
            dpkg-divert --remove --rename --package 'kernel-2.6-cn' \
                --divert /usr/sbin/$i.real /usr/sbin/$i >/dev/null
        echo -n " $i"
    fi
done
echo "."

################################################################################

# detect existing Grub2 installation

GRUB2="no"
if [ \( -e /boot/grub/grub.cfg \) -o \( -e /boot/grub/core.img \) -o \( -e /usr/lib/grub/i386-pc/ext2.mod \) ]; then
    echo "CN: Detected GRUB2 installation, will try to use it."
    GRUB2="yes"
    if [ -e /boot/grub/menu.lst ]; then
        echo "CN: Oops, GRUB1 (Legacy) installation detected. Will try to upgrade to GRUB2."
    fi
else
    echo "CN: No GRUB2 detected, will continue with GRUB1 as default option."
fi

################################################################################

# check if we are under Xen DomU PV
# (perhaps check /sys/hypervisor/uuid in the future)

GRUB_MBR="yes"
if [ \( -w /dev/xvda \) -o \( -w /dev/xvdb \) ]; then
    echo "CN: Detected DomU instance, won't install Grub MBR."
    GRUB_MBR="no"
fi

################################################################################

# intro msg
echo -n "CN: Configuring system (this will take a while):"

# generate kernel-img.conf
if [ ! -e /etc/kernel-img.conf ]; then
    touch /etc/kernel-img.conf
fi

# update postinst_hook for grub/grub2
if grep -q postinst_hook /etc/kernel-img.conf; then
    cp_check_and_sed '^postinst_hook' \
        's;^postinst_hook[[:blank:]]*=.*;postinst_hook = /usr/sbin/update-grub;g' \
        /etc/kernel-img.conf || true
else
    echo "postinst_hook = /usr/sbin/update-grub" >> /etc/kernel-img.conf
fi

# update postrm_hook for grub/grub2
if grep -q postrm_hook /etc/kernel-img.conf; then
    cp_check_and_sed '^postrm_hook' \
        's;^postrm_hook[[:blank:]]*=.*;postrm_hook = /usr/sbin/update-grub;g' \
        /etc/kernel-img.conf || true
else
    echo "postrm_hook = /usr/sbin/update-grub" >> /etc/kernel-img.conf
fi

# enable initrd
if grep -q do_initrd /etc/kernel-img.conf; then
    cp_check_and_sed '^do_initrd' \
        's/^do_initrd[[:blank:]]*=.*/do_initrd = yes/g' \
        /etc/kernel-img.conf || true
else
    echo "do_initrd = yes" >> /etc/kernel-img.conf
fi

echo -n " kernel-img.conf"

# generate initial grub loaders
if [ "x$GRUB2" = "xno" ]; then
    # Grub1 part
    if [ ! -d "$grub_dir" ]; then
        mkdir -p "$grub_dir"
        # x86
        if [ -d /usr/lib/grub/i386-pc ]; then
            cp -a /usr/lib/grub/i386-pc/* "$grub_dir"
        # x86_64
        elif [ -d /usr/lib/grub/x86_64-pc ]; then
            cp -a /usr/lib/grub/x86_64-pc/* "$grub_dir"
        fi
    fi
else
    # Grub2 part
    if [ ! -d /boot/grub ]; then
        mkdir -p /boot/grub
        if [ -d /usr/lib/grub/i386-pc ]; then
            cp -a /usr/lib/grub/i386-pc/* /boot/grub
        fi
    fi
fi
echo -n " grub1"

# create/update grub configuration
if [ "x$GRUB2" = "xno" ]; then
    # Grub1 part
    if [ -e "$menu_file" ]; then
        # is there uncompatibile grub conf present?
        if ! grep -q 'AUTOMAGIC KERNELS LIST' "$menu_file"; then
            mv -f "$menu_file" "$menu_file.old"
        fi
    fi
    if [ ! -e "$menu_file" ]; then
        yes | update-grub >/dev/null 2>&1 || true
    else
        update-grub >/dev/null 2>&1 || true
    fi
else
    # Grub2 part
    touch /boot/grub/grub.cfg
    update-grub >/dev/null 2>&1 || true
fi
echo -n " grub2"

# workaround grsec
if uname -a | grep -q grsec; then
    if [ -x /sbin/chpax ]; then
        # grub
        if [ -x /usr/sbin/grub.real ]; then
            chpax -spmrx /usr/sbin/grub.real >/dev/null 2>&1 || true
        elif [ -x /usr/sbin/grub ]; then
            chpax -spmrx /usr/sbin/grub >/dev/null 2>&1 || true
        fi

        # grub-probe
        if [ -x /usr/sbin/grub-probe.real ]; then
            chpax -spmrx /usr/sbin/grub-probe.real >/dev/null 2>&1 || true
        elif [ -x /usr/sbin/grub-probe ]; then
            chpax -spmrx /usr/sbin/grub-probe >/dev/null 2>&1 || true
        fi

        echo -n " grsec"
    fi
fi

# remove obsolete devfs/compat links and restore normal udev behaviour
rm -f /etc/udev/rules.d/devfs.rules /etc/udev/rules.d/compat.rules \
    /etc/udev/rules.d/compat-full.rules
#if [ ! -e /etc/udev/rules.d/udev.rules ]; then
#    ln -s ../udev.rules /etc/udev/rules.d/udev.rules
#fi
udevadm control --reload_rules >/dev/null 2>&1 || true
udevadm settle || true
echo -n " udev"

# update device map if possible
if [ "x$GRUB2" = "xno" ]; then
    # Grub1 part
    if [ -f "$device_map" ]; then
        mv -f "$device_map" "$device_map.old"
    fi
    # possible situation when upgrading from Grub1 to Grub2
    if [ ! -x /usr/sbin/grub ]; then
        echo "."
        echo "CN: FATAL ERROR while trying to execute GRUB1!"
        echo "CN: Do not reboot your server and report this to syshelp@carnet.hr immediately!"
        exit 1
    fi
    grub --batch --no-floppy --device-map="$device_map" <<'EOF' >/dev/null 2>&1 || true
quit
EOF
    if [ ! -s "$device_map" ]; then
        if [ -f "$device_map.old" ]; then
            mv -f "$device_map.old" "$device_map"
        fi

    else
        rm -f "$device_map.old"
    fi
else
    # Grub2 part
    grub-mkdevicemap --no-floppy >/dev/null 2>&1 || true
    grub-install --no-floppy --grub-setup=/bin/true "$(grub-probe -t drive /boot/grub)" >/dev/null 2>&1 || true
fi
echo -n " grub3"

# import GRUB helper functions (again, updated device map)
. /usr/share/kernel-cn/grub-functions.sh

if [ "x$GRUB2" = "xno" ]; then
    # Grub1 part
    # get install device (0x80 BIOS device)
    install_device=$(grep '^(hd0)' "$device_map" | \
        sed -e 's%[^[:space:]]*[[:space:]]*\([^[:space:]]*\)%\1%')
    if [ -z "$install_device" ]; then
        echo "."
        echo "CN: FATAL ERROR while detecting boot disk!"
        echo "CN: Do not reboot your server and report this to syshelp@carnet.hr immediately!"
        exit 1
    fi

    # oops, install device is a symlink...
    if [ -h "$install_device" ]; then
        install_device_resolved=$(resolve_symlink "$install_device")
        if [ -z "$install_device_resolved" ]; then
            install_device_resolved="$install_device"
        fi

        # try to fix device map with symlink resolved device
        if [ "x$install_device_resolved" != "x$install_device" ]; then
            cp_check_and_sed '^\(hd0\)' \
                "s;^(hd0).*;(hd0)	$install_device_resolved;" "$device_map" \
                || true
        fi
    fi
else
    # Grub2 part
    install_device="(hd0)"
fi
echo -n " grub4"

# install GRUB loader: this will work for both Grub1 and Grub2
if [ "x$GRUB_MBR" = "xyes" ]; then
    if ! grub-install --no-floppy "$install_device" >/dev/null 2>&1; then
        echo "."
        echo "CN: FATAL ERROR while running grub-install on $install_device!"
        echo "CN: Do not reboot your server and report this to syshelp@carnet.hr immediately!"
        exit 1
    fi
    echo -n " grub5"
fi

# fix possible wrong params in menu.lst
if [ "x$GRUB2" = "xno" ]; then
    # Grub1 part
    cp_check_and_sed '^# groot=' \
      "s;^# groot=.*;# groot=$grub_root_device;g" \
          "$menu_file" || true
    cp_check_and_sed '^# kopt=' \
      "s;^# kopt=\(.*\)root=[^[:space:]]*\(.*\);# kopt=\1root=$root_device\2;g" \
          "$menu_file" || true
fi
update-grub >/dev/null 2>&1 || true
echo -n " grub6"

# fix possible wrong params in menu.lst
if [ "x$GRUB2" = "xno" ]; then
    # Grub1 part
    # ... and final stage of devfs/udev brokeness fix
    if [ "x$install_device_resolved" != "x$install_device" ]; then
        # get original (symlinked device)
        root_device=$(find_device_nonresolved "/")
        if [ -z "$root_device" ]; then
            root_device=$(find_root_device)
        fi

        # fix (hd0) mapping
        cp_check_and_sed '^\(hd0\)' \
            "s;^(hd0).*;(hd0)	$install_device;" "$device_map" \
            || true

        # fix global root= invocation
        cp_check_and_sed '^# kopt=' \
          "s;^# kopt=\(.*\)root=[^[:space:]]*\(.*\);# kopt=\1root=$root_device\2;g" \
              "$menu_file" || true

        # fix root= invocation for individual kernel profiles
        cp_check_and_sed '^kernel' \
          "s;\(^kernel.*\)root=[^[:space:]]*\(.*\);\1root=$root_device\2;g" \
              "$menu_file" || true
    fi
fi
echo -n " grub7"

# install to other boot sectors if needed (better safe than sorry)
if [ "x$GRUB_MBR" = "xyes" ]; then
    if [ "x$GRUB2" = "xyes" ]; then
        # Grub2 part
        db_get grub-pc/install_devices
        for i in `echo $RET | sed -e 's/,/ /g'`; do
            real_device="$(readlink -f "$i")"
            if [ -e "$real_device" ]; then
                grub-install --force --no-floppy $real_device \
                    >/dev/null 2>&1 || true
            fi
        done
    fi
    echo -n " grub8"
fi

# disable lilo
if [ -e /etc/lilo.conf ]; then
    mv -f /etc/lilo.conf /etc/lilo.conf.old
    echo -n " lilo"
fi

# mdadm
if [ -x /usr/share/mdadm/mkconf ]; then
    if [ ! -e /etc/mdadm/mdadm.conf ]; then
        touch /etc/mdadm/mdadm.conf
    fi

    /usr/share/mdadm/mkconf > /etc/mdadm/mdadm.conf.$$
    if ! cmp -s /etc/mdadm/mdadm.conf.$$ /etc/mdadm/mdadm.conf; then
        mv /etc/mdadm/mdadm.conf.$$ /etc/mdadm/mdadm.conf
    fi
    rm -f /etc/mdadm/mdadm.conf.$$ /etc/initramfs-tools/hooks/md \
        /var/lib/mdadm/CONF-UNCHECKED
    echo -n " mdadm"
fi

# update initramfs accordingly (because of mdadm and udev)
update-initramfs -u -k all >/dev/null 2>&1 || true
echo -n " initramfs"

# finished
echo "."

################################################################################

# rest of configuration...
echo -n "CN: Modifying the neccessary system files:"

# remove group 99
if getent group proc >/dev/null 2>&1; then
    groupdel proc >/dev/null 2>&1
    echo -n " proc"
fi

# remove oidentd from oident group
if getent group oident >/dev/null 2>&1; then
    # sarge default
    cp_check_and_sed '^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*nogroup' \
      's/^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*nogroup/OIDENT_GROUP=oident/g' \
          /etc/default/oidentd || true

    # old kernel-2.6-cn default
    cp_check_and_sed '^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*proc' \
      's/^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*proc/OIDENT_GROUP=oident/g' \
          /etc/default/oidentd || true

    echo -n " oidentd"
fi

# default kernel parameters
rm -f /etc/sysctl.conf.$$

# old kernel params (skipping some of the obsolete or overrided entries)
if [ -e /etc/sysctl.conf ]; then
    egrep -v 'net\.core\.(r|w)mem_max|net\.ipv4\.tcp_(r|w)mem|vm\.bdflush|net\.ipv4\.ip_local_port_range|kernel\.rtsig-max|net\.ipv4\.tcp_syncookies|kernel\.exec-shield|net\.ipv4\.tcp_max_syn_backlog|net\.ipv4\.tcp_congestion_control|kernel\.maps_protect' \
        /etc/sysctl.conf >> /etc/sysctl.conf.$$
fi

# finished with merging, move into sysctl.conf
cp_mv /etc/sysctl.conf.$$ /etc/sysctl.conf
echo -n " sysctl.conf"

# reload sysctl ASAP
service procps restart

# finished with basic kernel-cn stuff
echo "."

################################################################################

# intro
echo -n "CN: Setting up PAM configurations:"

# update pam_limits accordingly
if [ -e /etc/security/limits.conf ]; then
    rm -f /etc/security/limits.conf.$$
    cp /etc/security/limits.conf /etc/security/limits.conf.$$
    cp-update kernel-cn /etc/security/limits.conf.$$ <<'EOF'
*       soft    core        0
*		hard	nofile		16384
*		soft	nofile		16384
@users  soft    nproc       100
@users  hard    nproc       150
EOF
    cp_mv /etc/security/limits.conf.$$ /etc/security/limits.conf
    echo -n " limits"
fi

# check pam.d/login
if [ -e /etc/pam.d/login ]; then
    cp_check_and_sed '^#.*session.+required.+pam_limits.so' \
        's/^#.*session.+required.+pam_limits.so/session required pam_limits.so/' \
        /etc/pam.d/login || true
    echo -n " login"
fi

# check pam.d/ssh
if [ -e /etc/pam.d/ssh ]; then
    cp_check_and_sed '^#.*session.+required.+pam_limits.so' \
        's/^#.*session.+required.+pam_limits.so/session required pam_limits.so/' \
        /etc/pam.d/ssh || true
    echo -n " ssh"
fi

# finished with PAM
echo "."

################################################################################

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0