File: wait-for-file

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swiftlang 6.1.3-4
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#!/bin/sh

if [ "$#" -ne 1 ]; then
   echo "usage: $0 <file>"
   exit 1
fi

FILE="$1"

echo "note: $0: waiting for file '${FILE}'"

# Spin-wait for up to ~one second for the file to appear.
START_TIME=$(date +%s)
END_TIME=$(expr "${START_TIME}" + 2)
while [ "$(date +%s)" -lt "${END_TIME}"  ]; do
  if [ -f "${FILE}" ]; then
    echo "note: file exists, exiting"
    exit 0
  fi
done

# If we never saw the file, exit with an error.
echo "error: never saw file appear"
exit 1