product=${product:-js}
branch=${branch:-1.9.1}
buildtype=${buildtype:-debug}
jsshellsourcepath=${jsshellsourcepath:-/work/mozilla/builds/1.9.1/mozilla/js/src}
TEST_MOZILLA_HG=${TEST_MOZILLA_HG:-http://hg.mozilla.org/releases/mozilla-1.9.1}
TEST_MOZILLA_HG_REV=${TEST_MOZILLA_HG_REV:-tip}