scripts/clvmd_fix_conf.sh

   1 #!/bin/bash
   2 #
   3 # Edit an lvm.conf file to enable cluster locking.
   4 #
   5 # $1 is the directory where the locking library is installed.
   6 # $2 (optional) is the config file
   7 # $3 (optional) is the locking library name
   8 #
   9 #
  10 PREFIX=$1
  11 LVMCONF=$2
  12 LIB=$3
  13
  14 if [ -z "$PREFIX" ]
  15 then
  16   echo "usage: $0 <prefix> [<config file>] [<library>]"
  17   echo ""
  18   echo "<prefix>|UNDO  location of the cluster locking shared library. (no default)"
  19   echo "               UNDO will reset the locking back to local"
  20   echo "<config file>  name of the LVM config file (default: /etc/lvm/lvm.conf)"
  21   echo "<library>      name of the shared library (default: liblvm2clusterlock.so)"
  22   echo ""
  23   exit 0
  24 fi
  25
  26 [ -z "$LVMCONF" ] && LVMCONF="/etc/lvm/lvm.conf"
  27 [ -z "$LIB" ] && LIB="liblvm2clusterlock.so"
  28
  29 if [ "$PREFIX" = "UNDO" ]
  30 then
  31   locking_type="1"
  32 else
  33   locking_type="2"
  34
  35   if [ "${PREFIX:0:1}" != "/" ]
  36   then
  37     echo "Prefix must be an absolute path name (starting with a /)"
  38     exit 12
  39   fi
  40
  41   if [ ! -f "$PREFIX/$LIB" ]
  42   then
  43     echo "$PREFIX/$LIB does not exist, did you do a \"make install\" ?"
  44     exit 11
  45   fi
  46 fi
  47
  48 if [ ! -f "$LVMCONF" ]
  49 then
  50   echo "$LVMCONF does not exist"
  51   exit 10
  52 fi
  53
  54
  55 SCRIPTFILE=`mktemp -t lvmscript.XXXXXXXXXX`
  56 TMPFILE=`mktemp -t lvmtmp.XXXXXXXXXX`
  57
  58
  59 # Flags so we know which parts of the file we can replace and which need
  60 # adding. These are return codes from grep, so zero means it IS present!
  61 have_type=1
  62 have_dir=1
  63 have_library=1
  64 have_global=1
  65
  66 grep -q '^[[:blank:]]*locking_type[[:blank:]]*=' $LVMCONF
  67 have_type=$?
  68
  69 grep -q '^[[:blank:]]*library_dir[[:blank:]]*=' $LVMCONF
  70 have_dir=$?
  71
  72 grep -q '^[[:blank:]]*locking_library[[:blank:]]*=' $LVMCONF
  73 have_library=$?
  74
  75 # Those options are in section "global {" so we must have one if any are present.
  76 if [ "$have_type" = "0" -o "$have_dir" = "0" -o "$have_library" = "0" ]
  77 then
  78
  79     # See if we can find it...
  80     grep -q '^[[:blank:]]*global[[:blank:]]*{' $LVMCONF
  81     have_global=$?
  82
  83     if [ "$have_global" = "1" ]
  84         then
  85         echo "global keys but no 'global {' found, can't edit file"
  86         exit 12
  87     fi
  88 fi
  89
  90 # So if we don't have "global {" we need to create one and
  91 # populate it
  92
  93 if [ "$have_global" = "1" ]
  94 then
  95     cat $LVMCONF - <<EOF > $TMPFILE
  96 global {
  97     # Enable locking for cluster LVM
  98     locking_type = $locking_type
  99     library_dir = "$PREFIX"
 100     locking_library = "$LIB"
 101 }
 102 EOF
 103     if [ $? != 0 ]
 104     then
 105         echo "failed to create temporary config file, $LVMCONF not updated"
 106         exit 1
 107     fi
 108 else
 109     #
 110     # We have a "global {" section, so add or replace the
 111     # locking entries as appropriate
 112     #
 113
 114     if [ "$have_type" = "0" ]
 115     then
 116         SEDCMD=" s/^[[:blank:]]*locking_type[[:blank:]]*=.*/\ \ \ \ locking_type = $locking_type/g"
 117     else
 118         SEDCMD=" /global[[:blank:]]*{/a\ \ \ \ locking_type = 2"
 119     fi
 120
 121     if [ "$have_dir" = "0" ]
 122     then
 123         SEDCMD="${SEDCMD}\ns'^[[:blank:]]*library_dir[[:blank:]]*=.*'\ \ \ \ library_dir = \"$PREFIX\"'g"
 124     else
 125         SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ library_dir = \"$PREFIX\""
 126     fi
 127
 128     if [ "$have_library" = "0" ]
 129     then
 130         SEDCMD="${SEDCMD}\ns/^[[:blank:]]*locking_library[[:blank:]]*=.*/\ \ \ \ locking_library = \"$LIB\"/g"
 131     else
 132         SEDCMD="${SEDCMD}\n/global[[:blank:]]*{/a\ \ \ \ locking_library = \"$LIB\""
 133     fi
 134
 135     echo -e $SEDCMD > $SCRIPTFILE
 136     sed  <$LVMCONF >$TMPFILE -f $SCRIPTFILE
 137     if [ $? != 0 ]
 138     then
 139         echo "sed failed, $LVMCONF not updated"
 140         exit 1
 141     fi
 142 fi
 143
 144 # Now we have a suitably editted config file in a temp place,
 145 # backup the original and copy our new one into place.
 146
 147 cp $LVMCONF $LVMCONF.nocluster
 148 if [ $? != 0 ]
 149     then
 150     echo "failed to backup old config file, $LVMCONF not updated"
 151     exit 2
 152 fi
 153
 154 cp $TMPFILE $LVMCONF
 155 if [ $? != 0 ]
 156     then
 157     echo "failed to copy new config file into place, check $LVMCONF is still OK"
 158     exit 3
 159 fi
 160
 161 rm -f $SCRIPTFILE $TMPFILE
 162