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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 ${child_pid}" EXIT
}
main "$@"
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