Tickets :: Comment on [#6559] Application should fail gracefully if prerequisites not installed

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Comment	>> I appreciate the thought that the application should degrade > >> gracefully even if random files are deleted from it - which is along > >> the same lines as saying it should function without its requirements > >> installed - but there's, to be buzzwordy about it, low ROI there for > >> an open source project. > > > > A requirement in the documentation is only as good as its enforcement > in the software. If IMP is a required module, then I should not be > able to run a Horde framework with only nag, mnemo, whups, and > wicked. But I can, which demonstrates a discrepancy between what the > documentation states are requirements and what the software states > are requirements. In the presence of such a discrepancy, the > software's view wins. > > > >> And I'm sorry, but how is IMP not a requirement for DIMP? > > > > Foremost because the software doesn't enforce the requirement. I > recognize the documentation states that IMP is a requirement, and > that's great, but the reality is that Horde (the collection) is a > complex organism, comprised of many different modules all with > differing requirements and implementation strategies, constrained by > a loose hegemony armed with guidelines designed to move everyone > toward a common goal. Recognizing that complexity, the purpose of > this request -- as low a priority as it may be -- is to provide a > product that remains strong in the face of users' errors. > > > > And since I'm the type of guy to put my mouth where my bug reports > are, here's a patch. This patch adds "requirement" support to > configuration XML documents. The completely optional <requires> > container lists the mandatory applications that the given > configuration needs. DIMP, for example, might read: > > <requires> > > <require app="imp" /> > > <require extension="imap" /> > > </requires> > > > > All requirements must be satisfied, or a warning is emitted on the > configuration page. In this case, both the imp application and the > PHP imap extension must be installed and loaded. The parser also > supports a version attribute for the requirement element, but I do > not immediately know how to get the version information consistently > from the registry or from an extension, so that's left as an exercise > for the reader.
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