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lib/frobs/migrate.ex
defmodule Frobs.Migrate do
@moduledoc """
One-time migration from per-frob registry.json files to settings.json
frob arrays. After successful migration of a frob, its registry.json is
deleted to prevent stale configuration.
"""
defp tools_dir() do
Path.join([Settings.get_user_home(), "fnord", "tools"])
end
@spec maybe_migrate_registry_to_settings() :: :ok
def maybe_migrate_registry_to_settings() do
# Guard to avoid repeated migrations.
if Application.get_env(:fnord, :frobs_migrated_runtime, false) do
:ok
else
migrate_all()
Application.put_env(:fnord, :frobs_migrated_runtime, true)
:ok
end
end
defp migrate_all() do
tools_dir()
|> Path.join("*/registry.json")
|> Path.wildcard()
|> Enum.each(&migrate_one/1)
end
defp migrate_one(registry_path) do
frob_name = registry_path |> Path.dirname() |> Path.basename()
with {:ok, json} <- File.read(registry_path),
{:ok, data} <- Jason.decode(json) do
if Map.get(data, "global") == true do
Settings.Frobs.enable(:global, frob_name)
end
if is_list(data["projects"]) do
Enum.each(data["projects"], fn pn ->
unless project_migrated?(pn) do
Settings.Frobs.enable({:project, pn}, frob_name)
end
end)
end
safe_delete(registry_path)
else
_ -> :ok
end
end
defp project_migrated?(project_name) do
settings = Settings.new()
pdata = Settings.get_project_data(settings, project_name) || %{}
Map.has_key?(pdata, "frobs")
end
defp safe_delete(path) do
case File.rm(path) do
:ok -> :ok
{:error, _} -> :ok
end
end
end