user-tools/nopath

   1 #!/bin/bash
   2
   3 true <<'EOF'
   4 =pod
   5
   6 =head1 NAME
   7
   8 nopath - Run command by disregarding some PATH directories
   9
  10 =head1 SYNOPSIS
  11
  12 nopath [-r|--recursive] I<DIRLIST> I<COMMAND> [I<ARGS>]
  13
  14 =head1 DESCRIPTION
  15
  16 Run I<COMMAND> by looking up directories in C<PATH> environment variable
  17 as usual, except ignore those directories which are given in colon-delimited list, I<DIRLIST>.
  18
  19 Useful in situations like you have a wrapper command X which runs the "real" command X and
  20 don't want to burn in the wrapped command's full path, but keep relying on PATH-lookup mechanisms.
  21
  22 =cut
  23
  24 EOF
  25
  26
  27 set -e
  28 set -o pipefail
  29 set -u
  30
  31 . /usr/lib/tool/bash-utils
  32
  33
  34 opt_recursive=''
  35
  36 while [ $# != 0 ]
  37 do
  38         case "$1" in
  39         --help)
  40                 pod2text "$0"
  41                 exit 0;;
  42         -r|--recursive)
  43                 opt_recursive=1
  44                 ;;
  45         --)
  46                 shift
  47                 break;;
  48         -*)
  49                 errx -1 "unknown option: $1";;
  50         *)
  51                 break;;
  52         esac
  53         shift
  54 done
  55
  56 IFS=':'
  57 declare -a nopaths=($1)
  58 declare -a sys_paths=($PATH)
  59 IFS=$' \t\n'
  60 shift
  61
  62 sys_path=$PATH
  63
  64 declare -a paths=()
  65 for dir in ${sys_paths[@]}
  66 do
  67         if ! in_list "$dir" "${nopaths[@]}" && ! in_list "$dir/" "${nopaths[@]}" && ! in_list "${dir//%+(\/)}" "${nopaths[@]}"
  68         then
  69                 paths+=("$dir")
  70         fi
  71 done
  72
  73 PATH=`bash_join : "${paths[@]}"`
  74
  75 if [ $opt_recursive ]
  76 then
  77         exec "$@"
  78 else
  79         exec env PATH="$sys_path" "$@"
  80 fi