Author: kevans
Date: Sat Feb 24 03:35:35 2018
New Revision: 329897
URL: https://svnweb.freebsd.org/changeset/base/329897

Log:
  lualoader: Add nextboot support
  
  config.parse now takes an extra callback that is invoked on the full text of
  the config file. This callback dictates where we should actually try to
  parse this file or not.
  
  For nextboot, we use this to halt parsing if we see 'nextboot_enable="NO"'.
  If we don't, parse it and write 'nextboot_enable="NO" ' to it. The same
  caveat as with forth still applies- writing is only supported by UFS.

Modified:
  head/stand/lua/config.lua

Modified: head/stand/lua/config.lua
==============================================================================
--- head/stand/lua/config.lua   Sat Feb 24 03:33:46 2018        (r329896)
+++ head/stand/lua/config.lua   Sat Feb 24 03:35:35 2018        (r329897)
@@ -124,6 +124,27 @@ pattern_table = {
        }
 }
 
+local function check_nextboot()
+       local nextboot_file = loader.getenv("nextboot_file")
+       if nextboot_file == nil then
+               return
+       end
+
+       local function check_nextboot_disabled(text)
+               return not text:match("^nextboot_enable=\"NO\"")
+       end
+
+       if not config.parse(nextboot_file, true, check_nextboot_disabled) then
+               -- This only fails if it actually hit a parse error
+               print("Failed to parse nextboot configuration: '" ..
+                   nextboot_file .. "'")
+       end
+
+       local nfile = io.open(nextboot_file, 'w')
+       io.write(nfile, "nextboot_enable=\"NO\" ")
+       io.close(nfile)
+end
+
 -- Module exports
 -- Which variables we changed
 config.env_changed = {}
@@ -273,7 +294,9 @@ function config.loadmod(mod, silent)
 end
 
 -- silent runs will not return false if we fail to open the file
-function config.parse(name, silent)
+-- check_and_halt, if it's set, will be executed on the full text of the config
+-- file. If it returns false, we are to halt immediately.
+function config.parse(name, silent, check_and_halt)
        if silent == nil then
                silent = false
        end
@@ -294,6 +317,13 @@ function config.parse(name, silent)
                return silent
        end
 
+
+       if check_and_halt ~= nil then
+               if not check_and_halt(text) then
+                       -- We'll just pretend that everything is fine...
+                       return true
+               end
+       end
        local n = 1
        local status = true
 
@@ -438,6 +468,8 @@ function config.load(file)
                        end
                end
        end
+
+       check_nextboot()
 
        -- Cache the provided module_path at load time for later use
        config.module_path = loader.getenv("module_path")
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