scripts/lvmconf.sh

   1 #!/bin/bash
   2 #
   3 # Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
   4 #
   5 # This file is part of the lvm2 package.
   6 #
   7 # This copyrighted material is made available to anyone wishing to use,
   8 # modify, copy, or redistribute it subject to the terms and conditions
   9 # of the GNU General Public License v.2.
  10 #
  11 # You should have received a copy of the GNU General Public License
  12 # along with this program; if not, write to the Free Software Foundation,
  13 # Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  14
  15 #
  16 # Edit an lvm.conf file to adjust various properties
  17 #
  18
  19 function usage
  20 {
  21     echo "usage: $0 <command>"
  22     echo ""
  23     echo "Commands:"
  24     echo "Enable clvm:  --enable-cluster [--lockinglibdir <dir>] [--lockinglib <lib>]"
  25     echo "Disable clvm: --disable-cluster"
  26     echo "Set locking library: --lockinglibdir <dir> [--lockinglib <lib>]"
  27     echo ""
  28     echo "Global options:"
  29     echo "Config file location: --file <configfile>"
  30     echo ""
  31 }
  32
  33
  34 function parse_args
  35 {
  36     while [ -n "$1" ]; do
  37         case $1 in
  38             --enable-cluster)
  39                 LOCKING_TYPE=3
  40                 shift
  41                 ;;
  42             --disable-cluster)
  43                 LOCKING_TYPE=1
  44                 shift
  45                 ;;
  46             --lockinglibdir)
  47                 if [ -n "$2" ]; then
  48                     LOCKINGLIBDIR=$2
  49                     shift 2
  50                 else
  51                     usage
  52                     exit 1
  53                 fi
  54                 ;;
  55             --lockinglib)
  56                 if [ -n "$2" ]; then
  57                     LOCKINGLIB=$2
  58                     shift 2
  59                 else
  60                     usage
  61                     exit 1
  62                 fi
  63                 ;;
  64             --file)
  65                 if [ -n "$2" ]; then
  66                     CONFIGFILE=$2
  67                     shift 2
  68                 else
  69                     usage
  70                     exit 1
  71                 fi
  72                 ;;
  73             *)
  74                 usage
  75                 exit 1
  76         esac
  77     done
  78 }
  79
  80 function validate_args
  81 {
  82     [ -z "$CONFIGFILE" ] && CONFIGFILE="/etc/lvm/lvm.conf"
  83
  84     if [ ! -f "$CONFIGFILE" ]
  85             then
  86             echo "$CONFIGFILE does not exist"
  87             exit 10
  88     fi
  89
  90     if [ -z "$LOCKING_TYPE" ] && [ -z "$LOCKINGLIBDIR" ]; then
  91         usage
  92         exit 1
  93     fi
  94
  95     if [ -n "$LOCKINGLIBDIR" ]; then
  96
  97         if [ "${LOCKINGLIBDIR:0:1}" != "/" ]
  98             then
  99             echo "Prefix must be an absolute path name (starting with a /)"
 100             exit 12
 101         fi
 102
 103         if [ -n "$LOCKINGLIB" ] && [ ! -f "$LOCKINGLIBDIR/$LOCKINGLIB" ]
 104             then
 105             echo "$LOCKINGLIBDIR/$LOCKINGLIB does not exist, did you do a \"make install\" ?"
 106             exit 11
 107         fi
 108
 109     fi
 110
 111     if [ "$LOCKING_TYPE" = "1" ] && [ -n "$LOCKINGLIBDIR" -o -n "$LOCKINGLIB" ]; then
 112         echo "Superfluous locking lib parameter, ignoring"
 113     fi
 114 }
 115
 116 umask 0077
 117
 118 parse_args "$@"
 119
 120 validate_args
 121
 122
 123 SCRIPTFILE=/etc/lvm/.lvmconf-script.tmp
 124 TMPFILE=/etc/lvm/.lvmconf-tmp.tmp
 125
 126
 127 # Flags so we know which parts of the file we can replace and which need
 128 # adding. These are return codes from grep, so zero means it IS present!
 129 have_type=1
 130 have_dir=1
 131 have_library=1
 132 have_global=1
 133
 134 grep -q '^[[:blank:]]*locking_type[[:blank:]]*=' $CONFIGFILE
 135 have_type=$?
 136
 137 grep -q '^[[:blank:]]*library_dir[[:blank:]]*=' $CONFIGFILE
 138 have_dir=$?
 139
 140 grep -q '^[[:blank:]]*locking_library[[:blank:]]*=' $CONFIGFILE
 141 have_library=$?
 142
 143 # Those options are in section "global {" so we must have one if any are present.
 144 if [ "$have_type" = "0" -o "$have_dir" = "0" -o "$have_library" = "0" ]
 145 then
 146
 147     # See if we can find it...
 148     grep -q '^[[:blank:]]*global[[:blank:]]*{' $CONFIGFILE
 149     have_global=$?
 150
 151     if [ "$have_global" = "1" ]
 152         then
 153         echo "global keys but no 'global {' found, can't edit file"
 154         exit 13
 155     fi
 156 fi
 157
 158 if [ "$LOCKING_TYPE" = "2" ] && [ -z "$LOCKINGLIBDIR" ] && [ "$have_dir" = "1" ]; then
 159         echo "no library_dir specified in $CONFIGFILE"
 160         exit 16
 161 fi
 162
 163 # So if we don't have "global {" we need to create one and
 164 # populate it
 165
 166 if [ "$have_global" = "1" ]
 167 then
 168     if [ -z "$LOCKING_TYPE" ]; then
 169         LOCKING_TYPE=1
 170     fi
 171     if [ "$LOCKING_TYPE" = "3" ] || [ "$LOCKING_TYPE" = "2" ]; then
 172         cat $CONFIGFILE - <<EOF > $TMPFILE
 173 global {
 174     # Enable locking for cluster LVM
 175     locking_type = $LOCKING_TYPE
 176     library_dir = "$LOCKINGLIBDIR"
 177 EOF
 178         if [ $? != 0 ]
 179         then
 180             echo "failed to create temporary config file, $CONFIGFILE not updated"
 181             exit 14
 182         fi
 183         if [ -n "$LOCKINGLIB" ]; then
 184             cat - <<EOF >> $TMPFILE
 185     locking_library = "$LOCKINGLIB"
 186 EOF
 187             if [ $? != 0 ]
 188             then
 189                 echo "failed to create temporary config file, $CONFIGFILE not updated"
 190                 exit 16
 191             fi
 192         fi
 193         cat - <<EOF >> $TMPFILE
 194 }
 195 EOF
 196     fi # if we aren't setting cluster locking, we don't need to create a global section
 197
 198     if [ $? != 0 ]
 199     then
 200         echo "failed to create temporary config file, $CONFIGFILE not updated"
 201         exit 17
 202     fi
 203 else
 204     #
 205     # We have a "global {" section, so add or replace the
 206     # locking entries as appropriate
 207     #
 208
 209     if [ -n "$LOCKING_TYPE" ]; then
 210         if [ "$have_type" = "0" ]
 211         then
 212             SEDCMD=" s/^[[:blank:]]*locking_type[[:blank:]]*=.*/\ \ \ \ locking_type = $LOCKING_TYPE/g"
 213         else
 214             SEDCMD=" /global[[:blank:]]*{/a\ \ \ \ locking_type = $LOCKING_TYPE"
 215         fi
 216     fi
 217
 218     if [ -n "$LOCKINGLIBDIR" ]; then
 219         if [ "$have_dir" = "0" ]
 220             then
 221             SEDCMD="${SEDCMD}\ns'^[[:blank:]]*library_dir[[:blank:]]*=.*'\ \ \ \ library_dir = \"$LOCKINGLIBDIR\"'g"
 222         else
 223             SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ library_dir = \"$LOCKINGLIBDIR\""
 224         fi
 225     fi
 226
 227     if [ -n "$LOCKINGLIB" ]; then
 228         if [ "$have_library" = "0" ]
 229             then
 230             SEDCMD="${SEDCMD}\ns/^[[:blank:]]*locking_library[[:blank:]]*=.*/\ \ \ \ locking_library = \"$LOCKINGLIB\"/g"
 231         else
 232             SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ locking_library = \"$LOCKINGLIB\""
 233         fi
 234     fi
 235
 236     echo -e $SEDCMD > $SCRIPTFILE
 237     sed  <$CONFIGFILE >$TMPFILE -f $SCRIPTFILE
 238     if [ $? != 0 ]
 239     then
 240         echo "sed failed, $CONFIGFILE not updated"
 241         exit 15
 242     fi
 243 fi
 244
 245 # Now we have a suitably editted config file in a temp place,
 246 # backup the original and copy our new one into place.
 247
 248 cp $CONFIGFILE $CONFIGFILE.lvmconfold
 249 if [ $? != 0 ]
 250     then
 251     echo "failed to backup old config file, $CONFIGFILE not updated"
 252     exit 2
 253 fi
 254
 255 cp $TMPFILE $CONFIGFILE
 256 if [ $? != 0 ]
 257     then
 258     echo "failed to copy new config file into place, check $CONFIGFILE is still OK"
 259     exit 3
 260 fi
 261
 262 rm -f $SCRIPTFILE $TMPFILE