Re: dependencies and applications

On 21 Aug 2003 at 18:49, Alexander Merz wrote: > Greg Beaver wrote: > > There is a simple solution (from a users point of view) > > We split up the command pear into two different: > > "pear-lib" for library packages > "pear-app" for applications > > An use case: > you install the current DB (ie. v1.3): > pear-lib install DB > > The you install an application, ie myDBAdmin > pear-app install myDBAdmin > > pear-app checks the deps of myDBAdmin, and find such thing like > "require > DB 1.x". It checks with pear-lib if this version is installed; and > it registers in the pear-lib registry, that an application requires an > 1.x version. > > two months later: > you update DB to 2.0 > pear-lib upgrade DB > pear-lib see, that this a new major version and checks its registry, > if there are any dependencies of apps requirering a lower major > version. If this is true, it copies the current installed 1.3 version > to the base dir of the applications. > > This keeps BC behavoir keeps BC at all and solves the publicweb > problem, because a pear-app must support installing on every > directory, not only to the PEAR-Dir! I can't fully agree with you. Yes, that's the point of a user - and maybe it works for your single-user-system as well. But taking into account that php / pear is used often on servers and many also run virtual hosts again we have the problem described earlier. And there are enough (!) applications that just come a "copy these files there and edit the configfile"-style that you can't assume that the package- database will know which applications use DB 1.3 or something when you upgrade to DB 2.0. Also copying of DB 1.3 to all dirs is not a good solution in my eyes as explained earlier. And one more thing you should notice: What about the case when you have only DB 2.0 on your system and THEN want to use a program / tool / script that still relies on 1.3? "Well, I would rewrite it or not use it" is no good answer to this question. A centralised storage for 1.x and 2.0-libs would not have this problem. Give it a thought. And if you finally come to the conclusion that it might be a good way to go don't fear to tell me. It's no shame :-)))) Just my 0.02 Euros (2 cents) Stefan