tao
Accessing the priv folder from Mix release
I’m deploying a Phoenix app with Mix releases. I’d like to access a static file, stored in the priv/ directory, during runtime.
When I enter the running app, I can see the following directory structure:
iex(backend@5714fba14b09)10> File.ls()
{:ok, ["lib", "tmp", "bin", "erts-10.4.4", "releases", "Procfile"]}
If I want to access anything in priv, I have to use the full path lib/backend-2.2.0/priv/.../myfile.json (for example). I could write code to generate this path based on the version and app name but that seems fragile – is there a better way? I tried looking into how Ecto does this for migrations, but with no luck!
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NobbZ
The most idiomatic and most reliable and only correct way is to use :code.priv_dir/1.
tao
Thank you both!
I’ve noticed that neither Application.app_dir/2 not :code.priv_dir/1 seem to work in config files, since the app does not exist yet. Is there any way around this?
LostKobrakai
If you do Application.app_dir(:myapp, "priv/static/file.ext") it’ll work. It surely isn’t the same as :code.priv_dir as it’s always starting at the parent of the priv dir, but it works. E.g. Plug.Static is using it.
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