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95 lines
3.4 KiB
95 lines
3.4 KiB
#!/bin/bash
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#
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# Script for running java with a timeout.
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#
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# The timeout in seconds must be the first argument. The rest of the arguments
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# are passed to the java binary itself.
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#
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# For example:
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# java-timeout 120 -cp classes.jar org.junit.runner.JUnitCore
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# runs:
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# java -cp classes.jar org.junit.runner.JUnitCore
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# with a timeout of 2 minutes.
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set -euo pipefail
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# Prints a message and terminates the process.
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function fatal() {
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echo "FATAL: $*"
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exit 113
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}
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# Function that is invoked if java is terminated due to timeout.
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# It take the process ID of the java command as an argument if it has already
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# been started, or the empty string if not. It should very rarely receive the
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# empty string as the pid, but it is possible.
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function on_timeout() {
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echo 'FATAL: command timed out'
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local pid="${1-}"
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shift || fatal '[on_timeout] missing argument: pid'
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test $# = 0 || fatal '[on_timeout] too many arguments'
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if [ "$pid" != '' ]; then
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# It is possible that the process already terminated, but there is not much
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# we can do about that.
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kill -TERM -- "-$pid" # Kill the entire process group.
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fi
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}
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# Executes java with the given argument, waiting for a termination signal from
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# runalarm which this script is running under. The arguments are passed to the
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# java binary itself.
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function execute() {
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# Trap SIGTERM, which is what we will receive if runalarm interrupts us.
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local pid # Set below after we run the process.
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trap 'on_timeout $pid' SIGTERM
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# Starts java within a new process group and saves it process ID before
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# blocking waiting for it to complete. 'setsid' starts the process within a
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# new process group, which means that it will not be killed when this shell
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# command is killed. This is needed so that the signal handler in the trap
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# command above to be invoked before the java command is terminated (and will
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# in fact have to terminate it itself).
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setsid -w java "$@" & pid="$!"; wait "$pid"
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}
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# Runs java with a timeout. The first argument is either the timeout in seconds
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# or the string 'execute', which is used internally to execute the command under
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# runalarm.
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function main() {
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local timeout_secs="${1-}"
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shift || fatal '[main]: missing argument: timeout_secs'
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# The reset of the arguments are meant for the java binary itself.
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if [[ $timeout_secs = '0' ]]; then
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# Run without any timeout.
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java "$@"
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elif [[ $timeout_secs = 'execute' ]]; then
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# This means we actually have to execute the command.
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execute "$@"
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elif (( timeout_secs < 30 )); then
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# We want to have a timeout of at least 30 seconds, so that we are
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# guaranteed to be able to start the java command in the subshell. This also
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# catches non-numeric arguments.
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fatal 'Must specify a timeout of at least 30 seconds.'
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else
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# Wrap the command with the standard timeout(1) if available.
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# "runalarm" is a Google timeout clone, and Mac users who've installed
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# GNU coreutils have timeout available as "gtimeout".
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if type timeout > /dev/null 2>&1 ; then
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timeout "${timeout_secs}" "$0" 'execute' "$@"
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elif type runalarm > /dev/null 2>&1 ; then
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runalarm -t "$timeout_secs" "$0" 'execute' "$@"
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elif type gtimeout > /dev/null 2>&1 ; then
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gtimeout "${timeout_secs}s" "$0" 'execute' "$@"
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else
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# No way to set a timeout available, just execute directly.
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echo "Warning: unable to enforce timeout." 1>&2
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java "$@"
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fi
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fi
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}
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main "$@"
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