Similar to the popular wait-for-it.sh that waits for a network connection, this bash script waits for a file to exist. It does not have the same api as wait-for-it.sh, but could be extended easily enough to be the same.

wait-for-file.sh

#!/bin/bash

# Usage: ./wait-for-file.sh /path/to/your/file

FILE_PATH="$1"
TIMEOUT=30
SLEEP_INTERVAL=1
ELAPSED=0

if [ -z "$FILE_PATH" ]; then
    echo "Usage: $0 /path/to/your/file"
    exit 1
fi

echo "Waiting for file: $FILE_PATH"

while [ ! -f "$FILE_PATH" ]; do
    sleep $SLEEP_INTERVAL
    ELAPSED=$((ELAPSED + SLEEP_INTERVAL))

    if [ $ELAPSED -ge $TIMEOUT ]; then
        echo "Timeout reached, file not found."
        exit 1
    fi
done

echo "File is now available: $FILE_PATH"
# Continue with your script here...