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download_mars () {
    update_url="$1"
    only="$2"
    test_only="$3"
    to_build_id="$4"
    to_app_version="$5"
    to_display_version="$6"

    max_tries=5
    try=1
    # retrying until we get offered an update
    while [ "$try" -le "$max_tries" ]; do
        echo "Using  $update_url"
        # retrying until AUS gives us any response at all
        cached_download update.xml "${update_url}"

        echo "Got this response:"
        cat update.xml
        # If the first line after <updates> is </updates> then we have an
        # empty snippet. Otherwise we're done
        if [ "$(grep -A1 '<updates>' update.xml | tail -1)" != "</updates>" ]; then
            break;
        fi
        echo "Empty response, sleeping"
        sleep 5
        try=$(($try+1))
    done

    echo; echo;  # padding

    update_line=`fgrep "<update " update.xml`
    grep_rv=$?
    if [ 0 -ne $grep_rv ]; then
        echo "FAIL: no <update/> found for $update_url"
        return 1
    fi
    command=`echo $update_line | sed -e 's/^.*<update //' -e 's:>.*$::' -e 's:\&amp;:\&:g'`
    eval "export $command"

    if [ ! -z "$to_build_id" -a "$buildID" != "$to_build_id" ]; then
        echo "FAIL: expected buildID $to_build_id does not match actual $buildID"
        return 1
    fi

    if [ ! -z "$to_display_version" -a "$displayVersion" != "$to_display_version" ]; then
        echo "FAIL: expected displayVersion $to_display_version does not match actual $displayVersion"
        return 1
    fi

    if [ ! -z "$to_app_version" -a "$appVersion" != "$to_app_version" ]; then
        echo "FAIL: expected appVersion $to_app_version does not match actual $appVersion"
        return 1
    fi

    mkdir -p update/
    if [ -z $only ]; then
      only="partial complete"
    fi
    for patch_type in $only
      do
      line=`fgrep "patch type=\"$patch_type" update.xml`
      grep_rv=$?

      if [ 0 -ne $grep_rv ]; then
        echo "FAIL: no $patch_type update found for $update_url"
        return 1
      fi

      command=`echo $line | sed -e 's/^.*<patch //' -e 's:/>.*$::' -e 's:\&amp;:\&:g'`
      eval "export $command"

      if [ "$test_only" == "1" ]
      then
        echo "Testing $URL"
        curl -k -s -I -L $URL
        return
      else
        cached_download "update/${patch_type}.mar" "${URL}"
      fi
      if [ "$?" != 0 ]; then
        echo "Could not download $patch_type!"
        echo "from: $URL"
      fi
      actual_size=`perl -e "printf \"%d\n\", (stat(\"update/$patch_type.mar\"))[7]"`
      actual_hash=`openssl dgst -$hashFunction update/$patch_type.mar | sed -e 's/^.*= //'`

      if [ $actual_size != $size ]; then
          echo "FAIL: $patch_type from $update_url wrong size"
          echo "FAIL: update.xml size: $size"
          echo "FAIL: actual size: $actual_size"
          return 1
      fi

      if [ $actual_hash != $hashValue ]; then
          echo "FAIL: $patch_type from $update_url wrong hash"
          echo "FAIL: update.xml hash: $hashValue"
          echo "FAIL: actual hash: $actual_hash"
          return 1
      fi

      cp update/$patch_type.mar update/update.mar
      echo $actual_size > update/$patch_type.size

    done
}