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|
#!/bin/bash
#
# Edit an lvm.conf file to enable cluster locking.
#
# $1 is the directory where the locking library is installed.
# $2 (optional) is the config file
# $3 (optional) is the locking library name
#
#
PREFIX=$1
LVMCONF=$2
LIB=$3
if [ -z "$PREFIX" ]
then
echo "usage: $0 <prefix> [<config file>] [<library>]"
echo ""
echo "<prefix>|UNDO location of the cluster locking shared library. (no default)"
echo " UNDO will reset the locking back to local"
echo "<config file> name of the LVM config file (default: /etc/lvm/lvm.conf)"
echo "<library> name of the shared library (default: liblvm2clusterlock.so)"
echo ""
exit 0
fi
[ -z "$LVMCONF" ] && LVMCONF="/etc/lvm/lvm.conf"
[ -z "$LIB" ] && LIB="liblvm2clusterlock.so"
if [ "$PREFIX" = "UNDO" ]
then
locking_type="1"
else
locking_type="2"
if [ "${PREFIX:0:1}" != "/" ]
then
echo "Prefix must be an absolute path name (starting with a /)"
exit 12
fi
if [ ! -f "$PREFIX/$LIB" ]
then
echo "$PREFIX/$LIB does not exist, did you do a \"make install\" ?"
exit 11
fi
fi
if [ ! -f "$LVMCONF" ]
then
echo "$LVMCONF does not exist"
exit 10
fi
SCRIPTFILE=`mktemp -t lvmscript.XXXXXXXXXX`
TMPFILE=`mktemp -t lvmtmp.XXXXXXXXXX`
# 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:]]*=' $LVMCONF
have_type=$?
grep -q '^[[:blank:]]*library_dir[[:blank:]]*=' $LVMCONF
have_dir=$?
grep -q '^[[:blank:]]*locking_library[[:blank:]]*=' $LVMCONF
have_library=$?
# 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:]]*{' $LVMCONF
have_global=$?
if [ "$have_global" = "1" ]
then
echo "global keys but no 'global {' found, can't edit file"
exit 12
fi
fi
# So if we don't have "global {" we need to create one and
# populate it
if [ "$have_global" = "1" ]
then
cat $LVMCONF - <<EOF > $TMPFILE
global {
# Enable locking for cluster LVM
locking_type = $locking_type
library_dir = "$PREFIX"
locking_library = "$LIB"
}
EOF
if [ $? != 0 ]
then
echo "failed to create temporary config file, $LVMCONF not updated"
exit 1
fi
else
#
# We have a "global {" section, so add or replace the
# locking entries as appropriate
#
if [ "$have_type" = "0" ]
then
SEDCMD=" s/^[[:blank:]]*locking_type[[:blank:]]*=.*/\ \ \ \ locking_type = $locking_type/g"
else
SEDCMD=" /global[[:blank:]]*{/a\ \ \ \ locking_type = 2"
fi
if [ "$have_dir" = "0" ]
then
SEDCMD="${SEDCMD}\ns'^[[:blank:]]*library_dir[[:blank:]]*=.*'\ \ \ \ library_dir = \"$PREFIX\"'g"
else
SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ library_dir = \"$PREFIX\""
fi
if [ "$have_library" = "0" ]
then
SEDCMD="${SEDCMD}\ns/^[[:blank:]]*locking_library[[:blank:]]*=.*/\ \ \ \ locking_library = \"$LIB\"/g"
else
SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ locking_library = \"$LIB\""
fi
echo -e $SEDCMD > $SCRIPTFILE
sed <$LVMCONF >$TMPFILE -f $SCRIPTFILE
if [ $? != 0 ]
then
echo "sed failed, $LVMCONF not updated"
exit 1
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 $LVMCONF $LVMCONF.nocluster
if [ $? != 0 ]
then
echo "failed to backup old config file, $LVMCONF not updated"
exit 2
fi
cp $TMPFILE $LVMCONF
if [ $? != 0 ]
then
echo "failed to copy new config file into place, check $LVMCONF is still OK"
exit 3
fi
rm -f $SCRIPTFILE $TMPFILE
|
