There are barriers to implementing rpm in Cygwin, the most frequently mentioned being the fact that a cygwin process can't easily replace cygwin1.dll or any other running executables.
If the in-Cygwin package manager can't update core Cygwin, that's not a deal breaker IMO: there is a fair bit of useful app package management that can be done without changing the core.
As for running executables -- well, perhaps this is more of my ignorance :) but couldn't a well behaved package close down running services in the preremove script? (In the case the package was being upgraded.)
Best Regards, Chris -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple