tests/rwx-to-mode

   1 #!/bin/sh
   2 # Convert an ls-style permission string, like drwxr----x and -rw-r-x-wx
   3 # to the equivalent chmod --mode (-m) argument, (=,u=rwx,g=r,o=x and
   4 # =,u=rw,g=rx,o=wx).  Ignore ACLs.
   5
   6 case $# in
   7   1) rwx=$1;;
   8   *) echo "$0: wrong number of arguments" 1>&2
   9     echo "Usage: $0 ls-style-mode-string" 1>&2
  10     exit 1;;
  11 esac
  12
  13 case $rwx in
  14   [ld-][rwx-][rwx-][rwxsS-][rwx-][rwx-][rwxsS-][rwx-][rwx-][rwxtT-]) ;;
  15   [ld-][rwx-][rwx-][rwxsS-][rwx-][rwx-][rwxsS-][rwx-][rwx-][rwxtT-]+) ;;
  16   *) echo "$0: invalid mode string: $rwx" 1>&2; exit 1;;
  17 esac
  18
  19 # Perform these conversions:
  20 # S  s
  21 # s  xs
  22 # T  t
  23 # t  xt
  24 # The `T' and `t' ones are only valid for `other'.
  25 s='s/S/@/;s/s/x@/;s/@/s/'
  26 t='s/T/@/;s/t/x@/;s/@/t/'
  27
  28 u=`echo $rwx|sed 's/^.\(...\).*/,u=\1/;s/-//g;s/^,u=$//;'$s`
  29 g=`echo $rwx|sed 's/^....\(...\).*/,g=\1/;s/-//g;s/^,g=$//;'$s`
  30 o=`echo $rwx|sed 's/^.......\(...\).*/,o=\1/;s/-//g;s/^,o=$//;'$s';'$t`
  31 echo "=$u$g$o"
  32 exit 0