On Tue, Feb 17, 2009 at 02:29:39AM +0300, Dmitry V. Levin wrote:
> On Mon, Feb 16, 2009 at 04:05:08PM +0300, Alexey Tourbin wrote:
> > On Mon, Feb 16, 2009 at 03:23:12PM +0300, Dmitry V. Levin wrote:
> > > On Mon, Feb 16, 2009 at 11:16:51AM +0300, Alexey Tourbin wrote:
> > > [...]
> > > > 0:1.0-alt1 cmp 1.0-alt2 should yield 1.
> > > 
> > > Why?
> > > 
> > > > Zero serial is greater than no serial.
> > > 
> > > Why?
> > 
> > This is because how rpm-4.0 works.
> > 
> > lib/psm.c:
> >     72  int rpmVersionCompare(Header first, Header second)
> 
> If rpmVersionCompare() works this way, why rpmEVRcmp() doesn't work the
> same way?

That's because rpmEVRcmp() is botched.

rpmdb/rpmvercmp.c:
   155  /* Compare {A,B} [epoch:]version[-release] */
   156  int 
   157  rpmEVRcmp(const char * const aE, const char * const aV, const char * const aR,
   158            const char * const aDepend,
   159            const char * const bE, const char * const bV, const char * const bR,
   160            const char * const bDepend)
   161  {
   162      int sense = 0;
   163  
   164      rpmMessage(RPMMESS_DEBUG, "cmp e=%s, v=%s, r=%s\n and e=%s, v=%s, r=%s\n ",
   165                 aE, aV, aR, bE, bV, bR);
   166  
   167  
   168      if (aE && *aE && bE && *bE)
   169          sense = rpmvercmp(aE, bE);
   170      else if (aE && *aE && atol(aE) > 0) {
   171          /* XXX legacy epoch-less requires/conflicts compatibility */
   172          rpmMessage(RPMMESS_DEBUG, _("the \"B\" dependency needs an epoch (assuming same as \"A\")\n\tA %s\tB %s\n"),
   173                  aDepend, bDepend);
   174          sense = 0;
   175      } else if (bE && *bE && atol(bE) > 0)
   176          sense = -1;
   177  
   178      if (sense == 0) {
   179          sense = rpmvercmp(aV, bV);
   180          if (sense == 0 && aR && *aR && bR && *bR) {
   181              sense = rpmvercmp(aR, bR);
   182          }
   183      }
   184  
   185      return sense;
   186  }

That is, rpmEVRcmp() does not exercise quite the same logic as
rpmVersionCompare().

> Let's fix librpm rather than multiply workarounds.

Prepending zero serial was wrong anyway.