gluon-core: unify indentation in gluon/util.lua

package/gluon-core/luasrc/usr/lib/lua/gluon/util.lua

 -- Writes all lines from the file input to the file output except those starting with prefix
 -- Doesn't close the output file, but returns the file object
 local function do_filter_prefix(input, output, prefix)
-	local f = io.open(output, 'w+')
-	local l = prefix:len()
+  local f = io.open(output, 'w+')
+  local l = prefix:len()
 
-	for line in io.lines(input) do
-		if line:sub(1, l) ~= prefix then
-			f:write(line, '\n')
-		end
-	end
+  for line in io.lines(input) do
+    if line:sub(1, l) ~= prefix then
+      f:write(line, '\n')
+    end
+  end
 
-	return f
+  return f
 end
 
 
 local function escape_args(ret, arg0, ...)
-	if not arg0 then
-		return ret
-	end
+  if not arg0 then
+    return ret
+  end
 
-	return escape_args(ret .. "'" .. string.gsub(arg0, "'", "'\\''") .. "' ", ...)
+  return escape_args(ret .. "'" .. string.gsub(arg0, "'", "'\\''") .. "' ", ...)
 end
 
 
@@ -39,32 +39,32 @@ local uci = require('luci.model.uci').cursor()
 module 'gluon.util'
 
 function exec(...)
-	return os.execute(escape_args('', 'exec', ...))
+  return os.execute(escape_args('', 'exec', ...))
 end
 
 -- Removes all lines starting with a prefix from a file, optionally adding a new one
 function replace_prefix(file, prefix, add)
-	local tmp = file .. '.tmp'
-	local f = do_filter_prefix(file, tmp, prefix)
-	if add then
-		f:write(add)
-	end
-	f:close()
-	os.rename(tmp, file)
+  local tmp = file .. '.tmp'
+  local f = do_filter_prefix(file, tmp, prefix)
+  if add then
+  	f:write(add)
+  end
+  f:close()
+  os.rename(tmp, file)
 end
 
 function readline(fd)
-	local line = fd:read('*l')
-	fd:close()
-	return line
+  local line = fd:read('*l')
+  fd:close()
+  return line
 end
 
 function lock(file)
-	exec('lock', file)
+  exec('lock', file)
 end
 
 function unlock(file)
-	exec('lock', '-u', file)
+  exec('lock', '-u', file)
 end
 
 function node_id()