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#!/bin/bash
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# Copyright (C) 2010 Oregon State University
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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set -e
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. common.sh
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debug set -x
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TARGET=`mktemp -d` || exit 1
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CLEANUP+=("rmdir $TARGET")
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# If the target device is not a real block device we'll first losetup it.
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# This is needed for file disks.
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if [ ! -b $blockdev ]; then
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  ORIGINAL_BLOCKDEV=$blockdev
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  blockdev=$($LOSETUP -sf $blockdev)
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  CLEANUP+=("$LOSETUP -d $blockdev")
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fi
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filesystem_dev=$(map_disk0 $blockdev)
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CLEANUP+=("unmap_disk0 $blockdev")
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root_dev=$(map_partition $filesystem_dev root)
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boot_dev=$(map_partition $filesystem_dev boot)
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mount_disk0 $TARGET
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get_os_type
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case "${OS_TYPE}" in
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    debian)
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        HNAME="${TARGET}/etc/hostname"
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        OLD_HNAME="$(cat $HNAME)"
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        ;;
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    redhat)
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        HNAME="${TARGET}/etc/sysconfig/network"
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        OLD_HNAME="$(grep HOSTNAME ${HNAME} | \
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            sed -e 's/HOSTNAME=//' | \
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            sed -e s/\"//g)"
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        ;;
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    gentoo)
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        HNAME="${TARGET}/etc/conf.d/hostname"
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        OLD_HNAME="$(grep HOSTNAME ${HNAME} | \
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            sed -e 's/HOSTNAME=//' | \
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            sed -e s/\"//g)"
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        ;;
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    suse)
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        HNAME="${TARGET}/etc/HOSTNAME"
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        OLD_HNAME="$(cat $HNAME)"
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        ;;
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esac
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if [ "$OLD_HNAME" = "$old_name" \
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        -o "${OLD_HNAME}.$(echo $old_name | cut -d . -f 2,3)" \
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        = "$old_name"] ; then
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    case "${OS_TYPE}" in
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        debian|suse)
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            echo $instance > $HNAME
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            ;;
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        redhat)
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            sed -ie "s/HOSTNAME=${OLD_HNAME}/HOSTNAME=${instance}/" $HNAME
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            ;;
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        gentoo)
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            sed -ie "s/HOSTNAME.*/HOSTNAME=\"${OLD_HNAME}}\"/" $HNAME
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            ;;
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    esac
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else
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    log_error "Cannot rename from $old_name to $instance:"
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    log_error "Instance has a different hostname ($OLD_HNAME)"
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    exit 1
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fi
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# execute cleanups
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cleanup
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trap - EXIT
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exit 0