#!/bin/sh

# dist-chmod --- fixup file/directory permissions recursively
# Author: Noah Friedman <friedman@splode.com>
# Public domain.

# $Id: dist-chmod,v 1.5 2005/11/22 20:39:54 friedman Exp $

setgid=
sticky=
bits=
owner=
verbose=

while : ; do
  case $1 in
    -1    ) bits=o      ; shift ;;  # legacy dist-chmod1 behavior
    -2    ) bits=og     ; shift ;;  # legacy dist-chmod2 behavior
    -v    ) verbose=-v  ; set -x ; shift ;;
    -w    ) bits=$2     ; shift  ; shift ;;
    +s    ) setgid=,g+s ; shift  ;;
    -s    ) setgid=,g-s ; shift  ;;
    +t    ) sticky=,+t  ; shift  ;;
    -t    ) sticky=,-t  ; shift  ;;
    -[ou] ) owner=$2    ; shift  ; shift ;;
    --*   ) :           ; shift  ; break ;;
    -?*   ) opts=$1   # split single-letter options and reparse
            shift
            set fnord `echo $opts | sed -e 's/^-//;s/\(.\)/-\1 /g'` ${1+"$@"}
            shift ;;
    +*    ) opts=$1   # split single-letter options and reparse
            shift
            set fnord `echo $opts | sed -e 's/^\+//;s/\(.\)/+\1 /g'` ${1+"$@"}
            shift ;;
    *     ) break ;;
  esac
done

fmode=a+rw
case $bits in
  ''      ) :                      ;;
  *[=+-]* ) fmode=$fmode,$bits     ;;
  *       ) fmode=$fmode,${bits}-w ;;
esac

chmod $verbose -R $fmode ${1+"$@"}

dmode=a+x$setgid$sticky,$fmode
if find --version 2>&1 | grep 'GNU find' > /dev/null ; then
  find ${1+"$@"} ! -type l -type d -print0 \
   | xargs --null --no-run-if-empty chmod $verbose $dmode
else
  case $verbose in
    '' ) print=       ;;
    *  ) print=-print ;;
  esac
  find ${1+"$@"} ! -type l -type d $print -exec chmod $dmode '{}' ';'
fi

case $owner in
  ''  ) exit $? ;;
  *:* ) : ;;
  *.* ) owner=`echo "$owner" | sed -e 's/\./:/'` ;;
esac

chown $verbose -h -R $owner ${1+"$@"}

# eof