o script to adjust items in lvm.conf file - currently only handles turning

cluster lvm on and off

scripts/lvmconf.sh

@@ -0,0 +1,230 @@
+#!/bin/sh
+#
+# 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 ""
+    echo "Global options:"
+    echo "Config file location: --file <configfile>"
+    echo ""
+}
+
+
+function parse_args
+{
+    while [ -n "$1" ]; do
+        case $1 in
+            --enable-cluster)
+                LOCKING_TYPE=2
+                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 "$LOCKING_TYPE" ]; then
+        usage
+        exit 1
+    fi
+
+    if [ "$LOCKING_TYPE" == "2" ]; then
+
+        [ -z "$LOCKINGLIBDIR" ] && usage && exit 1    
+        [ -z "$LOCKINGLIB" ] && LOCKINGLIB="liblvm2clusterlock.so"
+            
+        if [ "${LOCKINGLIBDIR:0:1}" != "/" ]
+            then
+            echo "Prefix must be an absolute path name (starting with a /)"
+            exit 12
+        fi
+    
+        if [ ! -f "$LOCKINGLIBDIR/$LOCKINGLIB" ]
+            then
+            echo "$LOCKINGLIBDIR/$LOCKINGLIB does not exist, did you do a \"make install\" ?"
+            exit 11
+        fi
+        
+    fi
+}
+
+parse_args "$@"
+
+validate_args
+
+
+SCRIPTFILE=`mktemp /etc/lvm/lvmscript.XXXXXXXXXX`
+TMPFILE=`mktemp /etc/lvm/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:]]*=' $CONFIGFILE
+have_type=$?
+
+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 [ "$have_global" = "1" ] 
+	then
+	echo "global keys but no 'global {' found, can't edit file"
+	exit 12
+    fi
+fi
+
+# So if we don't have "global {" we need to create one and 
+# populate it
+
+if [ "$have_global" = "1" ]
+then
+    if [ "$LOCKING_TYPE" = "2" ]; then
+        cat $CONFIGFILE - <<EOF > $TMPFILE
+global {
+    # Enable locking for cluster LVM
+    locking_type = $LOCKING_TYPE
+    library_dir = "$LOCKINGLIBDIR"
+    locking_library = "$LOCKINGLIB"
+}
+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, $CONFIGFILE not updated"
+	exit 1
+    fi
+else
+    #
+    # We have a "global {" section, so add or replace the
+    # locking entries as appropriate
+    #
+
+    if [ "$have_type" = "0" ] 
+    then
+	SEDCMD=" s/^[[:blank:]]*locking_type[[:blank:]]*=.*/\ \ \ \ locking_type = $LOCKING_TYPE/g"
+    else
+	SEDCMD=" /global[[:blank:]]*{/a\ \ \ \ locking_type = $LOCKING_TYPE"
+    fi
+    
+    if [ "$LOCKING_TYPE" = "2" ]; 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 = \"$LOCKINGLIBDIR\""
+        fi
+
+        if [ "$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
+    else
+        # if we're not using cluster locking, remove the library dir and locking library name
+        if [ "$have_dir" = "0" ] 
+            then
+            SEDCMD="${SEDCMD}\n/^[[:blank:]]*library_dir[[:blank:]]*=.*/d"
+        fi
+
+        if [ "$have_library" = "0" ] 
+            then
+            SEDCMD="${SEDCMD}\n/^[[:blank:]]*locking_library[[:blank:]]*=.*/d"
+        fi
+    fi
+
+    echo -e $SEDCMD > $SCRIPTFILE
+    sed  <$CONFIGFILE >$TMPFILE -f $SCRIPTFILE
+    if [ $? != 0 ]
+    then
+	echo "sed failed, $CONFIGFILE 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 $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