util.startup: Check root after detecting platform and reading config (thanks SigmaTel71)
Ensures that startup.detect_platform() runs so know whether to use the
POSIX method of checking the current user or something else. Also after
reading the config so we know whether the root override setting is set.
local m_type = math.type;
local function unescape_token(escaped_token)
local unescaped = escaped_token:gsub("~1", "/"):gsub("~0", "~")
return unescaped
end
local function resolve_json_pointer(ref, path)
local ptr_len = #path + 1
for part, pos in path:gmatch("/([^/]*)()") do
local token = unescape_token(part)
if not (type(ref) == "table") then
return nil
end
local idx = next(ref)
local new_ref
if type(idx) == "string" then
new_ref = ref[token]
elseif m_type(idx) == "integer" then
local i = tonumber(token)
if token == "-" then
i = #ref + 1
end
new_ref = ref[i + 1]
else
return nil, "invalid-table"
end
if pos == ptr_len then
return new_ref
elseif type(new_ref) == "table" then
ref = new_ref
elseif not (type(ref) == "table") then
return nil, "invalid-path"
end
end
return ref
end
return { resolve = resolve_json_pointer }