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#!/bin/bash
#
# Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
#
# This file is part of the lvm2 package.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Edit an lvm.conf file to adjust various properties
#
function usage
{
echo "usage: $0 <command>"
echo ""
echo "Commands:"
echo "Enable clvm: --enable-cluster [--lockinglibdir <dir>] [--lockinglib <lib>]"
echo "Disable clvm: --disable-cluster"
echo "Set locking library: --lockinglibdir <dir> [--lockinglib <lib>]"
echo ""
echo "Global options:"
echo "Config file location: --file <configfile>"
echo ""
}
function parse_args
{
while [ -n "$1" ]; do
case $1 in
--enable-cluster)
LOCKING_TYPE=3
shift
;;
--disable-cluster)
LOCKING_TYPE=1
shift
;;
--lockinglibdir)
if [ -n "$2" ]; then
LOCKINGLIBDIR=$2
shift 2
else
usage
exit 1
fi
;;
--lockinglib)
if [ -n "$2" ]; then
LOCKINGLIB=$2
shift 2
else
usage
exit 1
fi
;;
--file)
if [ -n "$2" ]; then
CONFIGFILE=$2
shift 2
else
usage
exit 1
fi
;;
*)
usage
exit 1
esac
done
}
function validate_args
{
[ -z "$CONFIGFILE" ] && CONFIGFILE="/etc/lvm/lvm.conf"
if [ ! -f "$CONFIGFILE" ]
then
echo "$CONFIGFILE does not exist"
exit 10
fi
if [ -z "$LOCKING_TYPE" ] && [ -z "$LOCKINGLIBDIR" ]; then
usage
exit 1
fi
if [ -n "$LOCKINGLIBDIR" ]; then
if [ "${LOCKINGLIBDIR:0:1}" != "/" ]
then
echo "Prefix must be an absolute path name (starting with a /)"
exit 12
fi
if [ -n "$LOCKINGLIB" ] && [ ! -f "$LOCKINGLIBDIR/$LOCKINGLIB" ]
then
echo "$LOCKINGLIBDIR/$LOCKINGLIB does not exist, did you do a \"make install\" ?"
exit 11
fi
fi
if [ "$LOCKING_TYPE" = "1" ] && [ -n "$LOCKINGLIBDIR" -o -n "$LOCKINGLIB" ]; then
echo "Superfluous locking lib parameter, ignoring"
fi
}
umask 0077
parse_args "$@"
validate_args
SCRIPTFILE=/etc/lvm/.lvmconf-script.tmp
TMPFILE=/etc/lvm/.lvmconf-tmp.tmp
# Flags so we know which parts of the file we can replace and which need
# adding. These are return codes from grep, so zero means it IS present!
have_type=1
have_dir=1
have_library=1
have_global=1
grep -q '^[[:blank:]]*locking_type[[:blank:]]*=' $CONFIGFILE
have_type=$?
grep -q '^[[:blank:]]*library_dir[[:blank:]]*=' $CONFIGFILE
have_dir=$?
grep -q '^[[:blank:]]*locking_library[[:blank:]]*=' $CONFIGFILE
have_library=$?
# Those options are in section "global {" so we must have one if any are present.
if [ "$have_type" = "0" -o "$have_dir" = "0" -o "$have_library" = "0" ]
then
# See if we can find it...
grep -q '^[[:blank:]]*global[[:blank:]]*{' $CONFIGFILE
have_global=$?
if [ "$have_global" = "1" ]
then
echo "global keys but no 'global {' found, can't edit file"
exit 13
fi
fi
if [ "$LOCKING_TYPE" = "2" ] && [ -z "$LOCKINGLIBDIR" ] && [ "$have_dir" = "1" ]; then
echo "no library_dir specified in $CONFIGFILE"
exit 16
fi
# So if we don't have "global {" we need to create one and
# populate it
if [ "$have_global" = "1" ]
then
if [ -z "$LOCKING_TYPE" ]; then
LOCKING_TYPE=1
fi
if [ "$LOCKING_TYPE" = "3" ] || [ "$LOCKING_TYPE" = "2" ]; then
cat $CONFIGFILE - <<EOF > $TMPFILE
global {
# Enable locking for cluster LVM
locking_type = $LOCKING_TYPE
library_dir = "$LOCKINGLIBDIR"
EOF
if [ $? != 0 ]
then
echo "failed to create temporary config file, $CONFIGFILE not updated"
exit 14
fi
if [ -n "$LOCKINGLIB" ]; then
cat - <<EOF >> $TMPFILE
locking_library = "$LOCKINGLIB"
EOF
if [ $? != 0 ]
then
echo "failed to create temporary config file, $CONFIGFILE not updated"
exit 16
fi
fi
cat - <<EOF >> $TMPFILE
}
EOF
fi # if we aren't setting cluster locking, we don't need to create a global section
if [ $? != 0 ]
then
echo "failed to create temporary config file, $CONFIGFILE not updated"
exit 17
fi
else
#
# We have a "global {" section, so add or replace the
# locking entries as appropriate
#
if [ -n "$LOCKING_TYPE" ]; then
if [ "$have_type" = "0" ]
then
SEDCMD=" s/^[[:blank:]]*locking_type[[:blank:]]*=.*/\ \ \ \ locking_type = $LOCKING_TYPE/g"
else
SEDCMD=" /global[[:blank:]]*{/a\ \ \ \ locking_type = $LOCKING_TYPE"
fi
fi
if [ -n "$LOCKINGLIBDIR" ]; then
if [ "$have_dir" = "0" ]
then
SEDCMD="${SEDCMD}\ns'^[[:blank:]]*library_dir[[:blank:]]*=.*'\ \ \ \ library_dir = \"$LOCKINGLIBDIR\"'g"
else
SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ library_dir = \"$LOCKINGLIBDIR\""
fi
fi
if [ -n "$LOCKINGLIB" ]; then
if [ "$have_library" = "0" ]
then
SEDCMD="${SEDCMD}\ns/^[[:blank:]]*locking_library[[:blank:]]*=.*/\ \ \ \ locking_library = \"$LOCKINGLIB\"/g"
else
SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ locking_library = \"$LOCKINGLIB\""
fi
fi
echo -e $SEDCMD > $SCRIPTFILE
sed <$CONFIGFILE >$TMPFILE -f $SCRIPTFILE
if [ $? != 0 ]
then
echo "sed failed, $CONFIGFILE not updated"
exit 15
fi
fi
# Now we have a suitably editted config file in a temp place,
# backup the original and copy our new one into place.
cp $CONFIGFILE $CONFIGFILE.lvmconfold
if [ $? != 0 ]
then
echo "failed to backup old config file, $CONFIGFILE not updated"
exit 2
fi
cp $TMPFILE $CONFIGFILE
if [ $? != 0 ]
then
echo "failed to copy new config file into place, check $CONFIGFILE is still OK"
exit 3
fi
rm -f $SCRIPTFILE $TMPFILE
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