fixup

#!/bin/bash


# Fix up the permissions and group ownership of installation directories.  Sets
# group to 'sw' unless -G is given, setgid's directories unless -g is given, and
# makes all files group writable and other unwritable.
function fixup()
{
    # NOTE: Gnu xargs assumed, providing --no-run-if-empty

    local GROUP=sw
    local PERM='u+rwX,g+rwX,o+rX-w'
    local GROUPPERM='u+rwX,g+rX-w,o-rxw'
    local SETGID_DIRS=yes
    local SETX
    local HELP
    local OPTIND

    while getopts "gG:pP:xh" o; do
      case $o in
        g) unset SETGID_DIRS ;;
        G) GROUP=${OPTARG} ;;
        p) PERM=${GROUPPERM} ;;
        P) PERM=${OPTARG} ;;
        x) SETX=yes ;;
        h) HELP=yes ;;
      esac
    done
    shift $((OPTIND-1))
    #[[ $# == 0 || $HELP ]] && { echo -e "USAGE: $0 [ -g, to NOT setgid g+s on dirs ] [ -G group, default '$GROUP' ] [ -p, set group-restrictive permissions '$GROUPPERM' ] [ -x, show commands as they are executed ] [ -h, for help ] dir-or-file ..." ; return; }
    [[ $# == 0 || $HELP ]] && {
        echo "USAGE: fixup [ -g ] [ -G group ] [ -p ] [ -P permissions ] [ -x ] [ -h ] dir-or-file ..."
        echo
        echo "             -g        do NOT setgid g+s on dirs"
        echo "             -G group  change to group 'group', default '$GROUP'"
        echo "             -p        set group-restrictive permissions '$GROUPPERM'"
        echo "             -P perms  set permissions to 'perms', default '$PERM'"
        echo "             -x        show commands as they are executed, via shell 'set -x'"
        echo "             -h        help"
        return;
    }

    [[ $SETX ]] && set -x

    args=("$@")
    for arg in ${args[@]} ; do
        echo "fixup: '$arg'"
        echo "    Changing permissions to $PERM ..."
        chmod -R "$PERM" "$arg"
        echo "    Changing group to $GROUP ..."
        chgrp -hR $GROUP "$arg"
        if [[ $SETGID_DIRS ]] ; then
            echo "    Adding g+s to directory permissions ..."
            find "$arg" -type d -print0 | xargs -0 --no-run-if-empty chmod g+s
        fi
    done

    [[ $SETX ]] && set +x
}

fixup "$@"