#!/bin/bash
#
# Brute force script to update a directory managed by Git from another
# source. This is done by deleting all .tpl files from the directory and
# copying from the source. The result can be analyzed with git status
# for final cleanup.
#
# It is always possible to use 'git reset' in case of error...
#
# To process a directory tree (e.g. os/sl430-x86-64 when you are at top
# level and if your production SCDB is in ../cdb), use a find command like :
#   find os/sl430-x86_64 -type d -not -path '*.svn*' -exec \
#                                   tools/git-directory-sync {} ../cdb/cfg \;
#
# If your source directory root (last parameter) contains spaces, be sure that
# they are properly escaped with \.
#
# Written by Michel Jouvin - jouvin@lal.in2p3.fr - 31/10/12


usage () {
  echo "Usage:\t$(basename $0) dest_directory src_directory_root"
  exit 1
}


if [ -z "$1" -o -z "$2" ]
then
  usage
fi

dest_dir=$1
src_root=$2
src_dir=$src_root/$dest_dir

if [ ! -d "$dest_dir" ]
then
  echo "Error : destination directory $dest_dir doesn't exist"
  exit 2
fi

if [ ! -d "${src_root}" ]
then
  echo "Error : source directory root $src_root doesn't exist"
  exit 3
fi

# Check it is a SVN workspace
#$(svn info "$dest_dir" > /dev/null 2>&1)
#if [ $? -ne 0 ]
#then
#  echo "Error : destination directory $dest_dir is not a SVN workspace"
#  exit 4
#fi

show_svn_diff=0

# If $src_dir doesn't exist (but src_root exists), assume it has been
# removed and delete from $dest_dir.

if [ ! -d "$src_dir" ]
then
    echo "Removing $dest_dir"
    svn rm -q "$dest_dir"


else
  # Remove existing files from dest dir (can be recovered by svn revert)
  dest_files=$(find "$dest_dir" -mindepth 1 -maxdepth 1 -not -regex '.*.svn/.*' -not -type d)
  if [ -n "$dest_files" ]
  then
    echo "Cleaning $dest_dir"
    #show_svn_diff=1
    rm -f $dest_files
  fi

  # Copy existing files from source directory
  # Use find command twice to properly handle spaces in $src_dir
  src_files=$(find "$src_dir" -mindepth 1 -maxdepth 1 -not -regex '.*.svn/.*' -not -type d)
  if [ -n "$src_files" ]
  then
    echo "Updating $dest_dir from $src_dir"
    #show_svn_diff=1
    find "$src_dir" -mindepth 1 -maxdepth 1 -not -regex '.*.svn/.*' -not -type d -exec cp {} "$dest_dir" \;
  fi

  # Copy directories in source dir not existing in destination directory
  # and add to SVN. A special trick is used to allow spaces in directory name.
  subdirs=$(find "$src_dir" -maxdepth 1 -mindepth 1 -type d -not -name .svn)
  #echo subdirs = $subdirs
  if [ -n "$subdirs" ]
  then
    num_subdirs=$(echo "$subdirs" | awk -F'\n' -v RS='' '{print NF}')
  else
    num_subdirs=0
  fi
  #echo num_sbdirs = $num_subdirs
  for ((i=1; $i<=$num_subdirs; i++))
  do
    dir=$(echo "$subdirs" | awk -F'\n' -v RS='' "{print \$$i}")
    dest_subdir=${dest_dir}/$(basename "$dir")
    src_subdir="$dir"
    #echo Checking $subdir (i=$i)
    if [ ! -d "$dest_subdir" ]
    then
      echo "Creating $dest_subdir"
      cp -R "$src_subdir" "$dest_dir"
      find "$dest_subdir" -name .svn -type d -exec rm -Rf {} \;  2>/dev/null
      echo "Adding $dest_subdir to SVN"
      svn add -q "$dest_subdir" 
    fi
  done

fi

# Show differences
if [ $show_svn_diff -ne 0 ]
then
  echo "Differences (SVN)"
  svn status "$dest_dir"
fi