Define custom installer

[EdenEast]

I have a table that contains all my plugins. This table maps my plugins to their current commit hash and the date of that commit. An example of this would be:

local lockfile_data = {
  ["telescope.nvim"] = { commit = "6bddc38c25af7b50f99cb0c035248d7272971810", date = "2022-07-16T09:56:33+02:00"},
  ["nvim-lspconfig"] = { commit = "575d1f8bcdff90aaa663ad74275feb9972fa1e69", date = "2022-07-17T09:11:21+00:00"},
  -- ...
}

I want to create a custom installer command that would replace the default git one. Since I have the date of the commit saved I want to clone using --shallow-since option instead of --depth. This way I would be sure that I am cloning only what would be required, instead of just a depth of 999999.

Does anyone have any examples of using custom installer or updater?