I wrote a guide available at https://github.com/bmillare/dj.solo on how to
build fully isolated minimal Clojure "deployments" for friends. This is NOT
intended to be an industrial grade solution. Instead I am documenting the
surprisingly
simple process of loading a basic Clojure application.
Imagine that you want to show off your new Clojure app to your friend but
it turns out she uses Windows. She doesn't like you installing weird stuff
on her computer so she said you are only allowed to run everything from a
usb stick. To top it off, she doesn't even have Java installed. dj.solo solves
this problem of "deploying" your app to your friend under her constraints.
It does so by creating a standalone Clojure app/distribution that bundles
everything you need to run the application, including the dependent jars,
app source code, and the desired JVM. Nothing technically novel is
presented. Instead a simple approach is documented that is easy to
customize to your needs.
The advantages to this approach are:
- isolated installation
- barebones, minimal software
- you know what's being installed and being depended on
- startup to repl is much faster than leiningen or boot
- you can always add them later if you need their functionality
The limitations to this approach are:
- the OS will not suggest updates to Java
- although, theoretically, you could have the app detect a new Java
version, download it, and set the correct new paths
- You might have extra copies of Java, the system installation and the
app provided one
- potentially, if you put multiple apps, you will have a lot of
copies of the JVM
- this could be considered a feature if you want to run specific
versions
- still trivial to manage your self with symlinks
Feedback welcome.
Best,
Brent
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