On Sat, 1 Jan 2005, Robert Schiele wrote: > On Sat, Jan 01, 2005 at 11:32:41PM +0100, Jos Vos wrote: > > Hi, > > > > For some reason I thought the rpm version/release comparison was done > > by comparing the dotted components, but this does not seem to be > > the case. For example: > > > > pkg-1.0-3 < pkg-1.0-3A > > > > but > > > > pkg-1.0-3.B > pkg-1.0-3A.B > > > > To me, this looks strange. What is the explanation for this? > > A change between alphabetic characters and numeric ones is considered as two > components as if there was a dot in between. > > Thus you have for your first example 3 < 3.A and for the second one 3.B > > 3.A.B. Or: first second pkg-1.0-3 3 pkg-1.0-3A 3 A pkg-1.0-3A.B 3 A.B pkg-1.0-3.B 3 B Explained in: /usr/share/doc/rpm-4.3.1/dependencies as: The algorithm that RPM uses to determine the version ordering of packages is simple and developers are encouraged not to rely on the details of its working. Developers should keep their numbering scheme simple so any reasonable ordering algorithm would work. The version comparison algorithm is in the routine rpmvercmp() and it is just a segmented strcmp(3). First, the boundaries of the segments are found using isdigit(3)/isalpha(3). Each segment is then compared in order with the right most segment being the least significant. The alphabetical portions are compared using a lexical graphical ascii ordering, the digit segments strip leading zeroes and compare the strlen before doing a strcmp. If both numerical strings are equal, the longer string is larger. Notice that the algorithm has no knowledge of decimal fractions, and perl-5.6 is "older" than perl-5.00503 because the number 6 is less thanthe number 503. -- dag wieers, dag@xxxxxxxxxx, http://dag.wieers.com/ -- [all I want is a warm bed and a kind word and unlimited power] _______________________________________________ Rpm-list mailing list Rpm-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/rpm-list
