Check for postinstall script failure in setup?

[Igor Pechtchanski]

In a recent report (<http://cygwin.com/ml/cygwin/2005-07/msg00089.html>)
on the Cygwin list, I suspect the postinstall script for man silently
failed, and nobody detected it (well, something was printed to the log,
but who reads those?).

Should we introduce a notion of failure for postinstall scripts?  And have
setup warn if some postinstall scripts failed?  This will require
postinstall scripts to either "set -e" or use other means to exit on
error, and having setup check the error code.

If this idea sounds reasonable, I could work on adding the code to setup.
Without maintainer cooperation, however, this wouldn't be very useful,
hence this post.
	Igor
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