[PATCH] Postinstall script ordering in setup

[Igor Pechtchanski <pechtcha at cs dot nyu dot edu>]

Hi,

This patch adds a dependence tracking mechanism to postinstall scripts.
The idea is essentially the one described in
<http://cygwin.com/ml/cygwin-apps/2003-03/msg00022.html>.  This patch is
very preliminary, and not tested much beyond its ability to sort scripts
correctly (compiles, though).  This should provide a foundation for
further refinement, however.  Please comment.
	Igor
==============================================================================
ChangeLog:
2003-03-03  Igor Pechtchanski <pechtcha at cs dot nyu dot edu>

	* postinstall.cc (RunFindVisitor::executeAll): New
	member function that propagates script dependences,
	topologically sorts the script list, and then executes
	the scripts.
	(RunFindVisitor::visitFile): Add file to list instead of
	running it.
	(RunFindVisitor::files): New member variable.
	(processFile): New static helper function that extracts
	dependences from each script file.
	(do_postinstall): Add executeAll call.
	(FileDesc): New helper class.
	(sharpbang): New static helper function.

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