#!/bin/sh
#
# 2010 Nico Schottelius (nico-cdist at schottelius.org)
#
# 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/>.
#
# 
# For each created object
# run the manifest of the type (with object id),
# try to merge back newly created objects (otherwise fail),
# mark the object as being run
# and iterate until all objects are marked being run.
#
#
#

. cdist-config

if [ $# -ne 2 ]; then
   __cdist_usage "<target host> <object_base_dir>"
fi

set -eu

__cdist_target_host="$1"; shift
__cdist_object_base_dir="$1"; shift

# change to directory containing objects
cd "$__cdist_object_base_dir"

# Loop until we do not create new objects anymore
# which is equal to all objects have been run
__cdist_object_created_new=1


while [ "$__cdist_object_created_new" = 1 ]; do
   # assume we're done after this run
   __cdist_object_created_new=0

   # find all objects (every object has the source recorded)
   __cdist_object_list . > "$__cdist_tmp_file"

   # FIXME: DEBUG
   cat "$__cdist_tmp_file"

   while read object; do
      if [ ! -f "${object}/$__cdist_name_object_finished" ]; then
         echo "Working on object ${object} ..."

         type=${object%%/*}
         manifest="$__cdist_type_dir/${type}/${__cdist_name_init}"

         if [ -x "${manifest}" ]; then
            echo "Running manifest of type ${type} ..."

            # FIXME: use subdir in tmpdir?
            cdist-manifest-run "$__cdist_target_host" "${manifest}" "${__cdist_tmp_dir}"

            echo "Trying to merge... "

            # list of new objects
            cd "${__cdist_tmp_dir}"
            __cdist_object_list .  > "$__cdist_tmp_file"

            while read newobject; do
               if [ -e "$__cdist_object_base_dir/${newobject}" ]; then
                  __cdist_exit_err "${newobject} already exists, merge failed."
               else
                  # Fine, merge back! FIXME: touch correct here?
                  touch "${newobject}/$___cdist_name_object_finished"
                  pax -r -w "$newobject" "$__cdist_object_base_dir"
               fi
            done < "$__cdist_tmp_file"

            # Always rerun the whole loop if we ran
            # a manifest of an object
            break


            # FIXME: continue here
            # tar, cp, pax, mv?
            # mv/cp -n look good - posix?

            # pax:
            # pax -r -w  -k could work, but -k does not raise an error if files
            # are already existing

            # - copy if not existing
            # fail (abort whole recursive run) if existing
            # 
            # iterate over all new objects and copy each back?

         else
            # Be nice, warn user if manifests exists, but is not executable
            if [ -f "${manifest}" ]; then
               echo "Warning ${manifest} is not executable"
            fi
         fi


         # At least one more run needed
         __cdist_object_created_new=1
      fi
   done < "$__cdist_tmp_file"

done

exit 0