some openwrt functions

mf-update(){
  if [ ! -f Makefile ]; then
   echo "No Makefile found in folder."
   return 0
  fi
#  export repo=`grep "PKG_SOURCE_URL" Makefile | awk -F"=" {'print $2'}`
  export lcommit=`git ls-remote --heads src | grep master | awk {'print $1'} | head -1`
  export oversion=`grep "PKG_SOURCE_VERSION:=" Makefile | awk -F"=" {'print $2'}| cut -b 7-`
  export lrelease=`grep "PKG_RELEASE" Makefile | awk -F"=" {'print $2'}`
  let nrelease="$lrelease+1"
#  if [ -z "$repo" ]; then
#    echo "Not a Git repository!"
#    return 0
#  fi
  if [ "$lcommit" != "$oversion" ]; then
    cd ./src
    git pull
    cd ..
#    sed -i "s/^PKG_SOURCE_VERSION:=.*$/PKG_SOURCE_VERSION:=$lcommit/" Makefile
    sed -i "s/^PKG_RELEASE:=.*$/PKG_RELEASE:=$nrelease/" Makefile
    echo "Updated Makfile to use commit: $lcommit"
    echo "OLD RELEASE: $lrelease"
    echo "NEW RELEASE: $nrelease"
    return 1
  else
    echo "Makefile is already up-to-date with latest commit!"
    return 0
  fi
}