#!/bin/sh

#

# 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"

# Scale the timeout to match the sleep steps below, i.e. 1/0.02.

timer=$(( 50 * $timer ))

# If the test timeout have been extended, also scale the timer relative

# to the normal timing.

if [ "$HGTEST_TIMEOUT_DEFAULT" -lt "$HGTEST_TIMEOUT" ]; then

    timer=$(( ( $timer * $HGTEST_TIMEOUT) / $HGTEST_TIMEOUT_DEFAULT ))

fi

wait_on="$2"

create=""

if [ $# -eq 3 ]; then

    create="$3"

fi

if [ -n "$create" ]; then

    touch "$create"

    create=""

fi

while [ "$timer" -gt 0 ] && !([ -e "$wait_on" ] || [ -L "$wait_on" ]) ; do

    timer=$(( $timer - 1))

    sleep 0.02

done

if [ "$timer" -le 0 ]; then

    echo "file not created after $1 seconds: $wait_on" >&2

    exit 1

fi