On 24. 3. 2016 at 10:31:09, Florian Festi wrote: > On 03/24/2016 09:58 AM, Zhang Freeman wrote: > > Hi List! > > > > I post to ask for the differenced between 'Requires' and 'Requires(pre)' > > used in RPM spec file. > > > > As RPM wiki[1] tells, dependency defined via 'Requires(pre)' should be > > fulfilled before installation and can be freely removed after > > installation, and 'Requires' should be fulfilled after installation but > > before execution. > > > > However, things won't stick to the script in real life. I find these two > > work in the same way. > > > > Suppose I want to install package A, which depends on package B. RPM > > stops the process and warns me the dependency. After B is installed, > > installation of A turns to be succeed. Then I remove B, RPM erases both > > A and B! No matter it is "Requires(pre)" or "Requires". > > > > Shouldn't A stay operational after I remove B if I use 'Requires(pre)' ? > > Well, it should... not sure if the implementation really fully does it > that way. Also note, that there might be other dependencies for package > B that may prevent the erasure. Also note that dependency solver like > yum/dnf/zypper/... may have different idea of what packages to remove > than rpm itself (which actually doesn't select packages to remove a t > all, but just spits out error messages). > > Another difficult to spot difference between Requires: and > Requires(pre): is package ordering during the installation. In case of > circular dependencies rpm give precedence to Requires(pre): dependencies > and rather breaks up normal Requires: Looping in Honza Silhan. This topic has recently been opened in Fedora developer community, as it seems a lot of people were packaging their stuff in a wrong way. Details can be found here[1], perhaps it will answer some of your questions. [1] https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx/message/NGPJMDUVEW65TQSD262G6OQF6P6LWWRM/ Thanks, Jan _______________________________________________ Rpm-list mailing list Rpm-list@xxxxxxxxxxxxx http://lists.rpm.org/mailman/listinfo/rpm-list
