#!/bin/bash
# Copyright (c) 2011 The Native Client Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This file polls the appspot directory for a fixed time.

# We try to check if the revision we need is already available.  If it is
# then we have a good glibc to use and continue.  If it is not available then
# we check revisions forward - and if one of them is available then we give up:
# this means the revision we need was omitted for some reason and will not be
# ever built.

if ((${#@}<1)); then
  cat <<END
  Usage: $0 path_to_toolchain [max_sleep] [revisions_count]
END
  exit 10
fi
declare -r glibc_url_prefix=http://storage.googleapis.com/nativeclient-archive2/between_builders/x86_glibc/r
declare -r glibc_revision="$("$(dirname "$0")/glibc_revision.sh")"
if [[ "$(uname -s)" == "Darwin" ]]; then
  declare -r tar=gnutar
else
  declare -r tar=tar
fi
max_sleep=10000
if ((${#@}>1)); then
  max_sleep="$2"
fi
revisions_count=100
if ((${#@}>2)); then
  revisions_count="$3"
fi
for ((i=1;i<=max_sleep;)); do
  curl --fail --location --url \
      "$glibc_url_prefix$glibc_revision"/glibc_x86.tar.gz -o "$1/.glibc.tar" &&
  $tar xSvpf "$1/.glibc.tar" -C "$1" &&
  ( rm "$1/.glibc.tar" || ( sleep 30 && rm "$1/.glibc.tar" ) ) &&
  echo "Got glibc from revision $glibc_revision" &&
  exit 0
  for ((j=glibc_revision+1;j<glibc_revision+revisions_count;j++)); do
    echo "Check if revision \"$j\" is available..."
    if curl --fail --location --url \
          "$glibc_url_prefix$j"/glibc_x86.tar.gz > /dev/null; then
      exit 2
    fi
  done
  sleep_time="$i"
  # Chromium buildbot infrastructure won't let us sleep longer than 1000 without
  # producing output.  Limit by 1000 to avoid races.
  if ((i>=1000)); then
    sleep_time=1000
  fi
  sleep "$sleep_time"
  ((i+=sleep_time))
done
exit 1