src/pmlogger/utilproc.sh

   1 # Helper procedures for the scripts usually run from cron, e.g.
   2 # pmlogger_check, pmie_daily, etc
   3 #
   4
   5 # Handle shell expansion and quoting for $dir and adjust $args as
   6 # appropriate.
   7 # Called with $dir and $args set from reading the control file.
   8 # Returns $dir and $args which may be modified.
   9 # May use _error().
  10 #
  11 _do_dir_and_args()
  12 {
  13     close_quote=''
  14     do_shell=false
  15     case "$dir"
  16     in
  17         \"*)
  18             # "...."
  19             close_quote='*"'
  20             ;;
  21         \`*)
  22             # `....`
  23             close_quote='*`'
  24             ;;
  25         *\`*)
  26             _error "embedded \` without enclosing \": $dir"
  27             ;;
  28         \$\(*)
  29             # $(....)
  30             close_quote='*)'
  31             ;;
  32         *\$\(*)
  33             _error "embedded \$( without enclosing \": $dir"
  34             ;;
  35         *\$*)
  36             # ...$...
  37             do_shell=true
  38             ;;
  39     esac
  40     if [ -n "$close_quote" ]
  41     then
  42         # we have a "dir" argument that begins with one of the recognized
  43         # quoting mechanisms ... append additional words to $dir (from
  44         # $args) until quote is closed
  45         #
  46         newargs=''
  47         newdir="$dir"
  48         for word in $args
  49         do
  50             case $word
  51             in
  52                 $close_quote)
  53                     newdir="$newdir $word"
  54                     do_shell=true
  55                     ;;
  56                 *)
  57                     if $do_shell
  58                     then
  59                         # quote closed, gather remaining arguments
  60                         if [ -z "$newargs" ]
  61                         then
  62                             newargs="$word"
  63                         else
  64                             newargs="$newargs $word"
  65                         fi
  66                     else
  67                         # still within quote
  68                         newdir="$newdir $word"
  69                     fi
  70                     ;;
  71             esac
  72         done
  73         if $do_shell
  74         then
  75             dir="$newdir"
  76             args="$newargs"
  77         else
  78             _error "quote not terminated: $dir $args"
  79         fi
  80     fi
  81     $do_shell && dir="`eval echo $dir`"
  82 }