only unset xtrace if env.sh set it first #5875
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I noticed that the Buildomat logs for some of our tests didn't have execution tracing, despite
set -o xtraceat the top of their scripts! Turns out env.sh was the cause.Despite this script being Bash-specific (
$BASH_SOURCE) I went with a POSIXy implementation here.(Also fixed quoting, in case your checkout is within a directory path containing spaces.)