mirror of
https://github.com/octoleo/lsyncd.git
synced 2024-11-11 07:40:55 +00:00
63 lines
1.1 KiB
Lua
63 lines
1.1 KiB
Lua
--
|
|
-- lock.lua from Lsyncd -- the Live (Mirror) Syncing Demon
|
|
--
|
|
--
|
|
-- Locks globals.
|
|
--
|
|
-- No more globals can be created after this!
|
|
--
|
|
--
|
|
-- License: GPLv2 (see COPYING) or any later version
|
|
-- Authors: Axel Kittenberger <axkibe@gmail.com>
|
|
--
|
|
if lsyncd_version
|
|
then
|
|
print( 'Error, Lsyncd mantle already loaded' )
|
|
os.exit( -1 )
|
|
end
|
|
|
|
|
|
local t = _G
|
|
|
|
local mt = getmetatable( t ) or { }
|
|
|
|
|
|
-- TODO try to remove the underscore exceptions
|
|
mt.__index = function
|
|
(
|
|
t, -- table being accessed
|
|
k -- key used to access
|
|
)
|
|
if k ~= '_' and string.sub( k, 1, 2 ) ~= '__'
|
|
then
|
|
error( 'Access of non-existing global "' .. k ..'"', 2 )
|
|
else
|
|
rawget( t, k )
|
|
end
|
|
end
|
|
|
|
|
|
mt.__newindex = function
|
|
(
|
|
t, -- table getting a new index assigned
|
|
k, -- key value to assign to
|
|
v -- value to assign
|
|
)
|
|
if k ~= '_' and string.sub( k, 1, 2 ) ~= '__'
|
|
then
|
|
error(
|
|
'Lsyncd does not allow GLOBALS to be created on the fly. '
|
|
.. 'Declare "' .. k.. '" local or declare global on load.',
|
|
2
|
|
)
|
|
else
|
|
rawset( t, k, v )
|
|
end
|
|
end
|
|
|
|
|
|
function lockGlobals( )
|
|
setmetatable( t, mt )
|
|
end
|
|
|