script to insert minetest media files into a sqlite db

media_files_to_sqlite.lua

local lfs = require("lfs")
local sqlite3 = require("lsqlite3")

local cache_path = "path_to_minetest/cache/" -- please edit this!

local function check(expected, ...)
	if select(1, ...) == expected then
		return ...
	end
	error(string.format("expected retval %d, but got %d", expected, select(1, ...)),
			2)
end

local function checkOK(...)
	return check(sqlite3.OK, ...)
end

local mediafiles_folder_path = cache_path .. "media/"
local media_db_path = cache_path .. "media_db.sqlite"

local db, ret, msg = sqlite3.open(media_db_path)
if not db then
	print(msg)
	checkOK(ret)
end

local stmt_insert = db:prepare([[
	INSERT OR IGNORE INTO files
		VALUES(?, strftime('%s', 'now'), 0, ?, ?, ?);
]])

checkOK(db:exec([[BEGIN EXCLUSIVE;]]))

for filename in lfs.dir(mediafiles_folder_path) do
	local filepath = mediafiles_folder_path .. filename

	if assert(lfs.attributes(filepath, "mode")) == "file" then
		local file = assert(io.open(filepath))
		local data = assert(file:read("*a"))

		checkOK(stmt_insert:bind(1, filename)) -- sha1
		checkOK(stmt_insert:bind(2, 1)) -- cache_class (=Legacy=1)
		checkOK(stmt_insert:bind(3, 0)) -- data_format (=Raw=0)
		checkOK(stmt_insert:bind_blob(4, data)) -- data
		check(sqlite3.DONE, stmt_insert:step())

		file:close()
		stmt_insert:bind_values(nil, nil, nil, nil)
		stmt_insert:reset()
	end
end

checkOK(db:exec([[END;]]))

checkOK(db:close())

• Dependencies can be installed with luarocks: install luafilesystem and lsqlite3
• Tested with lua5.1 (luajit).
• The sqlite db must already exist.