auto release download bash

update.sh

#!/bin/sh

# Exit if no arguments are provided
if [ "$#" -lt 1 ]; then
    echo "Usage: $0 <owner/repo> [command]"
    exit 1
fi

# GitHub repository to download release from
REPO=$1

# Optional command to run
POST_UPDATE_COMMAND=$2

# Create a unique folder for each repository
REPO_FOLDER=$(echo $REPO | tr '/' '_')
mkdir -p "./${REPO_FOLDER}"

# Location of the file to store the last update time
LAST_UPDATE_FILE="./${REPO_FOLDER}/last_update"

# Time between updates in seconds (24 hours)
UPDATE_INTERVAL=86400

# Function to download the latest release
update_repo() {
    echo "Downloading the latest release of $REPO..."

    # Change directory to repository folder
    cd "./${REPO_FOLDER}" > /dev/null

    # Wipe the folder clean
    rm -rf ./*
    
    # Use GitHub API to get the download URLs of all assets in the latest release
    LATEST_RELEASE_URLS=$(curl -s https://api.github.com/repos/$REPO/releases/latest | grep 'browser_download_url' | cut -d '"' -f 4)
    
    # Download all assets
    for url in $LATEST_RELEASE_URLS; do
        curl -LO $url
    done
    
    # Restore previous directory
    cd - > /dev/null
    
    echo "Latest release assets downloaded."
}

while true; do
    # Get the current time
    CURRENT_TIME=$(date +%s)

    # Check if the last update file exists
    if [ ! -f $LAST_UPDATE_FILE ]; then
        # File doesn't exist, download the latest release and create the file
        update_repo
        echo $CURRENT_TIME > $LAST_UPDATE_FILE
    else
        # Read the last update time from the file
        LAST_UPDATE_TIME=$(cat $LAST_UPDATE_FILE)

        # Calculate the elapsed time since the last update
        ELAPSED_TIME=$(($CURRENT_TIME - $LAST_UPDATE_TIME))

        # Check if enough time has passed for a new update
        if [ $ELAPSED_TIME -ge $UPDATE_INTERVAL ]; then
            update_repo
            echo $CURRENT_TIME > $LAST_UPDATE_FILE
        else
            # Calculate the time remaining until the next update
            REMAINING_TIME=$(($UPDATE_INTERVAL - $ELAPSED_TIME))
            echo "Waiting for $REMAINING_TIME seconds before the next update."
        fi
    fi

    # Run the post-update command
    if [ ! -z "$POST_UPDATE_COMMAND" ]; then
        echo "Running post-update command: $POST_UPDATE_COMMAND"
        eval "$POST_UPDATE_COMMAND"
    fi

    # Wait for the remaining time or the full interval if an update was performed
    sleep $UPDATE_INTERVAL

done