How to write post-update hooks a la vim-plug?

[thisisrandy]

With vim-plug, we can write post-update hooks with the do option. For example, vim-kitty-navigator requires that some files be copied after installation, so the recommended setup is Plug 'knubie/vim-kitty-navigator', {'do': 'cp ./*.py ~/.config/kitty/'}.

I'm struggling to figure out how to do the same with lazy.nvim. After reading the plugin spec, it seemed that the build property was going to do the job, but then I looked through the Building page and realized that build is actually intended to build the plugin, not simply run after any updates. I have a solution as follows:

    config = function()
      local data = vim.fn.stdpath("data")
      os.execute("cp " .. data .. "/lazy/vim-kitty-navigator/*.py ~/.config/kitty/")
    end,

but this obviously runs on every load, which is much more often than I want. Is there a way to do the above only when the plugin is installed or updated?

[iton0]

based on the docs the build spec meets your requirements; it runs on install and when you update the plugin.

[thisisrandy]

Actually you're right. I could have sworn earlier that the build function wasn't actually running on install, but now it's doing exactly what I expected from the docs. Possibly being completely new to lazy.nvim, I wasn't actual un/reinstalling the plugin the way I thought I was.

Anyhow, appreciate the response.