#!/bin/sh
#
# 2010-2011 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

objectlist="${__cdist_tmp_dir}/objectfile"
newobjectlist="${__cdist_tmp_dir}/newobjectfile"
newobjects="${__cdist_tmp_dir}/newobjects"

no_new_object=n

# Loop until we do not create new objects anymore
# which is equal to all objects have been run
while [ "$no_new_object" = "n"  ]; do
   # assume we're done after this run
   no_new_object=y

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

   # Check every object, if we need to run it
   while read object; do
      cur_object_dir="$__cdist_object_base_dir/$object"

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

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

         if [ -x "${manifest}" ]; then
            echo "Executing manifest ${manifest} ..."
            cdist-manifest-run "$__cdist_target_host" "${manifest}" "${newobjects}"
            __cdist_object_list "${newobjects}" > "$newobjectlist"

            # Verify no conflicting objects have been created
            while read newobject; do
               grep -q "^$newobject\$" "$objectlist" && \
                  __cdist_exit_err "${manifest} tried to recreate ${newobject}"
            done < "$newobjectlist"


            # Safe harbour: We can merge all objects into main tree
            # Merge = mkdir + mv parameters
            while read newobject; do
               # Unset no_new_object - only once needed... FIXME (beautify)
               no_new_object="n"
               
               set -x
               # where to save the newly created object
               object_dir="$__cdist_object_base_dir/$newobject"

               # Source of the new object
               new_object_dir="${newobjects}/$newobject"

               echo "MIGRATING: $newobject"
               find $new_object_dir

               mkdir -p "$object_dir"
               mv "${new_object_dir}/"* "$object_dir"
               set +x
            done < "$newobjectlist"

            # Remove listing and rest of newobjects, otherwise the next type will reuse it...
            rm -rf "$newobjects" "$newobjectlist"
         else
            # Be nice, warn user if manifests exists, but is not executable
            if [ -f "${manifest}" ]; then
               echo "Warning ${manifest} exists, but is not executable." >&2
            fi
         fi
      fi

      # done with this object
      touch "$cur_object_dir/$__cdist_name_object_finished"

   done < "$objectlist"
done