contrib/lvm2/dist/scripts/lvmconf.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
   4 #
   5 # This file is part of the lvm2-cluster 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=2
  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 "$LOCKINGLIBDIR" ]; then
  96
  97         [ -z "$LOCKINGLIB" ] && LOCKINGLIB="liblvm2clusterlock.so"
  98
  99         if [ "${LOCKINGLIBDIR:0:1}" != "/" ]
 100             then
 101             echo "Prefix must be an absolute path name (starting with a /)"
 102             exit 12
 103         fi
 104
 105         if [ ! -f "$LOCKINGLIBDIR/$LOCKINGLIB" ]
 106             then
 107             echo "$LOCKINGLIBDIR/$LOCKINGLIB does not exist, did you do a \"make install\" ?"
 108             exit 11
 109         fi
 110
 111     fi
 112
 113     if [ "$LOCKING_TYPE" = "1" ] && [ -n "$LOCKINGLIBDIR" -o -n "$LOCKINGLIB" ]; then
 114         echo "Superfluous locking lib parameter, ignoring"
 115     fi
 116 }
 117
 118 umask 0077
 119
 120 parse_args "$@"
 121
 122 validate_args
 123
 124
 125 SCRIPTFILE=/etc/lvm/.lvmconf-script.tmp
 126 TMPFILE=/etc/lvm/.lvmconf-tmp.tmp
 127
 128
 129 # Flags so we know which parts of the file we can replace and which need
 130 # adding. These are return codes from grep, so zero means it IS present!
 131 have_type=1
 132 have_dir=1
 133 have_library=1
 134 have_global=1
 135
 136 grep -q '^[[:blank:]]*locking_type[[:blank:]]*=' $CONFIGFILE
 137 have_type=$?
 138
 139 grep -q '^[[:blank:]]*library_dir[[:blank:]]*=' $CONFIGFILE
 140 have_dir=$?
 141
 142 grep -q '^[[:blank:]]*locking_library[[:blank:]]*=' $CONFIGFILE
 143 have_library=$?
 144
 145 # Those options are in section "global {" so we must have one if any are present.
 146 if [ "$have_type" = "0" -o "$have_dir" = "0" -o "$have_library" = "0" ]
 147 then
 148
 149     # See if we can find it...
 150     grep -q '^[[:blank:]]*global[[:blank:]]*{' $CONFIGFILE
 151     have_global=$?
 152
 153     if [ "$have_global" = "1" ]
 154         then
 155         echo "global keys but no 'global {' found, can't edit file"
 156         exit 13
 157     fi
 158 fi
 159
 160 if [ "$LOCKING_TYPE" = "2" ] && [ -z "$LOCKINGLIBDIR" ] && [ "$have_dir" = "1" ]; then
 161         echo "no library_dir specified in $CONFIGFILE"
 162         exit 16
 163 fi
 164
 165 # So if we don't have "global {" we need to create one and
 166 # populate it
 167
 168 if [ "$have_global" = "1" ]
 169 then
 170     if [ -z "$LOCKING_TYPE" ]; then
 171         LOCKING_TYPE=1
 172     fi
 173     if [ "$LOCKING_TYPE" = "2" ]; then
 174         cat $CONFIGFILE - <<EOF > $TMPFILE
 175 global {
 176     # Enable locking for cluster LVM
 177     locking_type = $LOCKING_TYPE
 178     library_dir = "$LOCKINGLIBDIR"
 179     locking_library = "$LOCKINGLIB"
 180 }
 181 EOF
 182     fi # if we aren't setting cluster locking, we don't need to create a global section
 183
 184     if [ $? != 0 ]
 185     then
 186         echo "failed to create temporary config file, $CONFIGFILE not updated"
 187         exit 14
 188     fi
 189 else
 190     #
 191     # We have a "global {" section, so add or replace the
 192     # locking entries as appropriate
 193     #
 194
 195     if [ -n "$LOCKING_TYPE" ]; then
 196         if [ "$have_type" = "0" ]
 197         then
 198             SEDCMD=" s/^[[:blank:]]*locking_type[[:blank:]]*=.*/\ \ \ \ locking_type = $LOCKING_TYPE/g"
 199         else
 200             SEDCMD=" /global[[:blank:]]*{/a\ \ \ \ locking_type = $LOCKING_TYPE"
 201         fi
 202     fi
 203
 204     if [ -n "$LOCKINGLIBDIR" ]; then
 205         if [ "$have_dir" = "0" ]
 206             then
 207             SEDCMD="${SEDCMD}\ns'^[[:blank:]]*library_dir[[:blank:]]*=.*'\ \ \ \ library_dir = \"$LOCKINGLIBDIR\"'g"
 208         else
 209             SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ library_dir = \"$LOCKINGLIBDIR\""
 210         fi
 211
 212         if [ "$have_library" = "0" ]
 213             then
 214             SEDCMD="${SEDCMD}\ns/^[[:blank:]]*locking_library[[:blank:]]*=.*/\ \ \ \ locking_library = \"$LOCKINGLIB\"/g"
 215         else
 216             SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ locking_library = \"$LOCKINGLIB\""
 217         fi
 218     fi
 219
 220     if [ "$LOCKING_TYPE" = "1" ]; then
 221         # if we're not using cluster locking, remove the library dir and locking library name
 222         if [ "$have_dir" = "0" ]
 223             then
 224             SEDCMD="${SEDCMD}\n/^[[:blank:]]*library_dir[[:blank:]]*=.*/d"
 225         fi
 226
 227         if [ "$have_library" = "0" ]
 228             then
 229             SEDCMD="${SEDCMD}\n/^[[:blank:]]*locking_library[[:blank:]]*=.*/d"
 230         fi
 231     fi
 232
 233     echo -e $SEDCMD > $SCRIPTFILE
 234     sed  <$CONFIGFILE >$TMPFILE -f $SCRIPTFILE
 235     if [ $? != 0 ]
 236     then
 237         echo "sed failed, $CONFIGFILE not updated"
 238         exit 15
 239     fi
 240 fi
 241
 242 # Now we have a suitably editted config file in a temp place,
 243 # backup the original and copy our new one into place.
 244
 245 cp $CONFIGFILE $CONFIGFILE.lvmconfold
 246 if [ $? != 0 ]
 247     then
 248     echo "failed to backup old config file, $CONFIGFILE not updated"
 249     exit 2
 250 fi
 251
 252 cp $TMPFILE $CONFIGFILE
 253 if [ $? != 0 ]
 254     then
 255     echo "failed to copy new config file into place, check $CONFIGFILE is still OK"
 256     exit 3
 257 fi
 258
 259 rm -f $SCRIPTFILE $TMPFILE