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#!/usr/bin/env bash

# travis_keepalive runs the given command and preserves its return value,

# while it forks a child process what periodically produces a log line,

# so that Travis won't abort the build after 10 minutes.

# Why?

# `t.Log()` in Go holds the buffer until the test does not pass or fail,

# and `-race` can increase the execution time by 2-20x.

set -euo pipefail

readonly KEEPALIVE_INTERVAL=300 # seconds => 5m

main() {

keepalive

$@

}

# Keepalive produces a log line in each KEEPALIVE_INTERVAL.

keepalive() {

local child_pid

# Note: We fork here!

repeat "keepalive" &

child_pid=$!

ensureChildOnEXIT "${child_pid}"

}

repeat() {

local this="$1"

while true; do

echo "${this}"

sleep "${KEEPALIVE_INTERVAL}"

done

}

# Ensures that the child gets killed on normal program exit.

ensureChildOnEXIT() {

# Note: SIGINT and SIGTERM are forwarded to the child process by Bash

# automatically, so we don't have to deal with signals.

local child_pid="$1"

trap "kill ${child_pid}" EXIT

}

main "$@"