#!/bin/sh -e
#
# 2018 Ander Punnar (ander-at-kvlt-dot-ee)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#

[ "$( cat "$__object/explorer/file_exists" )" = '0' ] && exit 0

os="$( cat "$__global/explorer/os" )"

is_dir="$( cat "$__object/explorer/is_dir" )"

acl_is="$( cat "$__object/explorer/acl_is" )"

acl_path="/$__object_id"

if [ -f "$__object/parameter/default" ] && [ "$is_dir" = '1' ]
then
    set_default=1
else
    set_default=0
fi

acl_should="$( for parameter in user group mask other
do
    if [ ! -f "$__object/parameter/$parameter" ]
    then
        continue
    fi

    while read -r acl
    do
        if echo "$acl" | awk -F: '{ print $NF }' | grep -Fq 'X'
        then
            [ "$is_dir" = '1' ] && rep=x || rep=-

            acl="$( echo "$acl" | sed "s/\(.*\)X/\1$rep/" )"
        fi

        echo "$parameter" | grep -Eq '(mask|other)' && sep=:: || sep=:

        echo "$parameter$sep$acl"

        [ "$set_default" = '1' ] && echo "default:$parameter$sep$acl"
    done \
        < "$__object/parameter/$parameter"
done )"

setfacl_exec='setfacl'

if [ -f "$__object/parameter/recursive" ]
then
    if echo "$os" | grep -Eq 'macosx|freebsd'
    then
        echo "$os setfacl do not support recursive operations" >&2
    else
        setfacl_exec="$setfacl_exec -R"
    fi
fi

if [ -f "$__object/parameter/remove" ]
then
    if echo "$os" | grep -Fq 'solaris'
    then
        # Solaris setfacl behaves differently.
        # We will not support Solaris for now, because no way to test it.
        # But adding support should be easy (use -s instead of -m on modify).
        echo "$os setfacl do not support -x flag for ACL remove" >&2
    else
        echo "$acl_is" | while read -r acl
        do
            # Skip wanted ACL entries which already exist
            # and skip mask and other entries, because we
            # can't actually remove them, but only change.
            if echo "$acl_should" | grep -Eq "^$acl" \
                || echo "$acl" | grep -Eq '^(default:)?(mask|other)'
            then continue
            fi

            no_bits="$( echo "$acl" | sed 's/:...$//' )"

            echo "$setfacl_exec -x \"$no_bits\" \"$acl_path\""
        done
    fi
fi

for acl in $acl_should
do
    if ! echo "$acl_is" | grep -Eq "^$acl"
    then
        if echo "$os" | grep -Eq 'macosx|freebsd' \
            && echo "$acl" | grep -Eq '^default:'
        then
            echo "setting default ACL in $os is currently not supported. sorry :(" >&2
        else
            echo "$setfacl_exec -m \"$acl\" \"$acl_path\""
        fi
    fi
done