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?  Let's fix librpm rather than multiply workarounds.

apt-pkg/rpm/rpmversion.cc:
    94  // ---------------------------------------------------------------------
    95  /* This fragments the version into E:V-R triples and compares each 
    96     portion separately. */
    97  int rpmVersioningSystem::DoCmpVersion(const char *A,const char *AEnd,
    98                                        const char *B,const char *BEnd)
    99  {
   100     char *AE, *AV, *AR;
   101     char *BE, *BV, *BR;
   102     int rc = 0;
   103     ParseVersion(A, AEnd, &AE, &AV, &AR);
   104     ParseVersion(B, BEnd, &BE, &BV, &BR);
   105     if (AE && !BE)
   106         rc = 1;
   107     else if (!AE && BE)
   108         rc = -1;
   109     else if (AE && BE)
   110     {
   111        int AEi, BEi;
   112        AEi = atoi(AE);
   113        BEi = atoi(BE);
   114        if (AEi < BEi)
   115            rc = -1;
   116        else if (AEi > BEi)
   117            rc = 1;
   118     }
   119     if (rc == 0)
   120     {
   121        rc = rpmvercmp(AV, BV);
   122        if (rc == 0) {
   123            if (AR && !BR)
   124                rc = 1;
   125            else if (!AR && BR)
   126                rc = -1;
   127            else if (AR && BR)
   128                rc = rpmvercmp(AR, BR);
   129        }
   130     }
   131     free(AE);free(AV);free(AR);;
   132     free(BE);free(BV);free(BR);;
   133     return rc;
   134  }

vercmp seems to be reliable.
evrcmp is a "sdelai sam" thing.