Example task that synchronizes a directory using git

commit-and-push-task.sh

#! /usr/bin/env bash

r_evaluator()
{
   local cmd="$1"
   local statefile="$2"

   redirect_exekutor "${statefile}" echo "${cmd}" || exit 1

   case "${cmd}" in
      "stash pull")
         RVAL="pull"
         exekutor git stash save --quiet
      ;;

      "pull")
         RVAL="stash pop"
         exekutor git pull -f --quiet
      ;;

      "stash pop")
         RVAL="add"
         exekutor git stash pop --quiet
      ;;

      "add")
         RVAL="commit"
         exekutor git add --all
      ;;

      "commit")
         RVAL="push"
         exekutor git commit -m "* automated push from \
${MULLE_HOSTNAME} with mulle-monitor" --quiet
      ;;

      "push")
         RVAL=""
         exekutor git push -f --quiet
      ;;

      *)
         remove_file_if_present "${statefile}"
         fail "Unknown command \"${cmd}\""
      ;;
   esac
}


commit_and_push_task_run()
{
   log_entry "commit_and_push_task_run" "$@"

   local statefile

   [ -z "${MULLE_MONITOR_VAR_DIR}" ] && internal_fail "MULLE_MONITOR_VAR_DIR is undefined"

   statefile="${MULLE_MONITOR_VAR_DIR}/commit-and-push"

   #
   # Try not to lose anything...
   #
   # We keep an internal state and restart from there
   # assuming it got interrupted there.
   #
   #
   local cmd
   local lenient

   lenient='NO'
   if [ -f "${statefile}" ]
   then
      cmd="`cat "${statefile}"`"
      lenient='YES' # first command might have gone through
   fi
   cmd="${cmd:-stash pull}"

   r_mkdir_parent_if_missing "${statefile}" || exit 1

   while [ ! -z "${cmd}" ]
   do
      if ! r_evaluator "${cmd}" "${statefile}" "${lenient}"
      then
         [ "${lenient}" = 'NO' ] && exit 1
      fi

      cmd="${RVAL}"
      lenient='NO'
   done

   remove_file_if_present "${statefile}"
}


if [ -z "${MULLE_MONITOR_TASK_LOAD}" ]
then
   if [ -z "${MULLE_BASHFUNCTIONS_LIBEXEC_DIR}" ]
   then
      MULLE_BASHFUNCTIONS_LIBEXEC_DIR="`mulle-bashfunctions-env libexec-dir 2> /dev/null`"
      [ -z "${MULLE_BASHFUNCTIONS_LIBEXEC_DIR}" ] && \
         echo "mulle-bashfunctions are not installed" >&2 && \
         exit 1

      . "${MULLE_BASHFUNCTIONS_LIBEXEC_DIR}/mulle-bashfunctions.sh" || exit 1
   fi

   [ "${TRACE}" = 'YES' ] && set -x && : "$0" "$@"

   commit_and_push_task_run
fi