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testlib: add a small scrip to help process to synchronise using file...
testlib: add a small scrip to help process to synchronise using file Creating and waiting for files is a robust way to synchronise two processes running concurrently. We already use this approach in various tests. I am adding a official script to do so before adding more usage of this. Differential Revision: https://phab.mercurial-scm.org/D8189
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wait-on-file
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/ tests / testlib / wait-on-file
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#!/bin/bash
#
# wait up to TIMEOUT seconds until a WAIT_ON_FILE is created.
#
# In addition, this script can create CREATE_FILE once it is ready to wait.
if [ $# -lt 2 ] || [ $# -gt 3 ]; then
echo $#
echo "USAGE: $0 TIMEOUT WAIT_ON_FILE [CREATE_FILE]"
fi
timer="$1"
wait_on="$2"
create=""
if [ $# -eq 3 ]; then
create="$3"
fi
if [ -n "$create" ];
then
touch "$create"
create=""
fi
while [ "$timer" -gt 0 ] && [ ! -f "$wait_on" ];
do
timer=$(( timer - 1))
sleep 0.01
done
if [ "$timer" -le 0 ]; then
echo "file not created after $1 seconds: $wait_on" >&2
exit 1
fi