#!/bin/sh

set -e

FILENAME="/etc/kernel/postinst.d/kdump-tools"
DIVERTED_FILENAME="${FILENAME}.distrib"

# Shamelessly stolen from udev's postinst
chrooted() {
    if [ "$(stat -c %d/%i /)" = "$(stat -Lc %d/%i /proc/1/root 2>/dev/null)" ]; then
        # the devicenumber/inode pair of / is the same as that of /sbin/init's
        # root, so we're *not* in a chroot and hence return false.
        return 1
    fi
    echo "A chroot environment has been detected."
    return 0
}

case "$1" in
    configure)
        KVER=$(uname -r)
        if chrooted; then
            # If we are in a chroot then figure out the kernel version
            # in a different way. There could be multiple kernels installed
            # so this is not fool-proof
            KVER=$(dpkg-query -W -f='${binary:Package}\n' linux-image-* | head -n 1 | sed 's/linux-image-//')
        fi

        if [ ! -z ${KVER} ]; then
            if [ -e /var/lib/kdump/initrd.img-${KVER} ]; then
                echo "Backing up /var/lib/kdump/initrd.img-${KVER}"
                cp -pr /var/lib/kdump/initrd.img-${KVER} /var/lib/kdump/initrd.img-${KVER}.distrib
            fi

            echo "Running /etc/kernel/postinst.d/kdump-tools ${KVER}"
            /etc/kernel/postinst.d/kdump-tools ${KVER} ||:
        fi

        # Make sure our .distrib is there so that our postrm scripts
        # do the right thing
        if [ ! -f ${DIVERTED_FILENAME} ]; then
            if [ -f ${FILENAME} ]; then
                cp -f ${FILENAME} ${DIVERTED_FILENAME} ||:
            fi
        fi
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

exit 0