lists: add migrate3x script

This script is intended to be used for migration from Turris OS 3.x.

lists/base.lua.m4

@@ -13,11 +13,3 @@ list_script('terminal-apps.lua')
 Install("ds-lite", "6in4", "6rd", "6to4", { priority = 40 })
 
 _END_FEATURE_GUARD_
-
---[[
-We are migrating from uClibc to musl, so reinstall everything depending on libc.
-]]
-if installed['turris-version'] and version_match(installed['turris-version'].version, '<4.0') then
-	Package("libc", { abi_change_deep = true })
-	Package('updater-ng', { deps = { 'libgcc' } })
-end

lists/migrate3x.lua.m4

+--[[
+This is migration script used to migrate/update system from Turris OS 3.x to 4.x.
+
+We have to update updater first so we do immediate replan and update only updater
+itself.
+]]
+
+if not version_match or not self_version or version_match(self_version, "<63.0") then
+
+	local board
+	if model:match("[Oo]mnia") then
+		board = "omnia"
+	elseif model:match("^[Tt]urris$") then
+		board = "turris"
+	else
+		DIE("Unsupported Turris model: " .. tostring(model))
+	end
+
+	--[[
+	We provide access to only HBS repository and to only minimal set of feeds. We
+	don't need anything more to update updater.
+	]]
+	-- TODO move it to hbs when we have v63.0 in hbs
+	Repository("turris", "https://repo.turris.cz/hbt/packages/" .. pkg_board, {
+		subdirs = { "base", "core", "packages", "turrispackages"}
+	})
+
+	Install('updater-ng', { critical = true })
+
+	Package('updater-ng', {
+		replan = 'immediate',
+		deps = { 'libgcc', 'base-files' }
+	})
+	--[[
+	Updater package does not depend on libgcc but it requires it and dependency
+	breaks otherwise.
+
+	We also added base-files because that contains file /etc/os-release. We need
+	this file to detect target board (as a replacement to model variable).
+	]]
+
+else
+
+	function for_l10n(fragment)
+		-- Dummy function. Languages are ignored and installed later on.
+	end
+	Export('for_l10n')
+
+	-- Call base script to update rest of the base system
+	Script("base.lua")
+	-- TODO add package containing migration script
+
+end
+
+-- We are potentially migrating from uClibc so reinstall everything depending
+-- on it.
+--Package("libc", { abi_change_deep = true })