Recently, I was working on a software updater for my project and I found that there is no easy way for OTA update that is ready to use and work cross platform. So I decided to write one that is so universal, it works on all kind of application binaries or even interpreted languages, which I later called it the "Automatic Update Launcher"

go mod tidy
go build

{
    "version":"1.0"
    "start":"helloworld*",
    "backup":

Current Implementations

❔ How normal Desktop Programs Updates

Most desktop applications will use some kind of updater to update the main program by start and detaching the updater and allow it to do its things. This work on most desktop platforms but it will not works with systemd where the PID of the running application is important. (i.e. cannot change or otherwise systemd will assume it is dead and try to restart it)

❔ How embedded devices do OTA updates

Embedded devices usually uses two partitions (one for current running application, the other one for writing update files to) and a bootloader to do the switching. One common example ESP8266 which some projects utilize its bootloader's feature to do OTA update via WiFi or Bluetooth.

🌟 How the Automatic Update Launcher (auLauncher) works 🌟

The auLauncher works in a much simpler way following the logic described in the following diagram.

and the configuration of each steps and file names can be changed easily in a json file located next to the launcher's executable. Here is an example for that:

{
    "version":"1.0",
    "start":"helloworld*",
    "backup": ["./*.config","./*.exe"],
    "verbal": true,
    "resp_port": 25576,
    "max_retry": 3,
    "crash_time": 3
}

All arguments that passed to the launcher is then passed through to the main binary. So you can easily slide this in between your starting script and your target binary without the need for changing anything.

❓ How do my program update itself then?

It is simple! If you program want to update itself, just download the update files to the ./updates folder and exit itself with code 0. This way, the launcher will start overwriting the application files based on the defination in the json file and the contents in the ./updates folder and restart your application with given start path.

This method works for most Go compiled application, but in theory should also work with other compiled binaries and some interpret language like python with a correct starting bash / batch script.

If you are interested to know more, or just wanna try this launcher and make your application OTA update a new features, feel free to take a look at this repo and left some comments :))

go mod tidy
go build

{
    "version":"1.0"
    "start":"helloworld*",
    "backup":