comparison mercurial/commands.py @ 23254:d23834b871ac

debugrevlog: fix computing chain length in debugrevlog -d

The chain length was computed correctly only when generaldelta
feature was enabled. Now it's fixed.

When generaldelta is disabled the base revision in revlog index is not
the revision we have delta against - it's always previous revision.

Instead of incorrect chainbaseandlen in command.py we are now using two
single-responsibility functions in revlog.py:
 - chainbase(rev)
 - chainlen(rev)
Only chainlen(rev) was missing so it was written to mimic the way the
chain of deltas is actually found during file reconstruction.

23253:8d84b7a2dd91

        numrevs = len(r)
        ui.write("# rev p1rev p2rev start   end deltastart base   p1   p2"
                 " rawsize totalsize compression heads chainlen\n")
        ts = 0
        heads = set()
        rindex = r.index

        def chainbaseandlen(rev):
            clen = 0
            base = rindex[rev][3]
            while base != rev:
                clen += 1
                rev = base
                base = rindex[rev][3]
            return base, clen

        for rev in xrange(numrevs):
            dbase = r.deltaparent(rev)
            if dbase == -1:
                dbase = rev
            cbase, clen = chainbaseandlen(rev)
            p1, p2 = r.parentrevs(rev)
            rs = r.rawsize(rev)
            ts = ts + rs
            heads -= set(r.parentrevs(rev))
            heads.add(rev)

23254:d23834b871ac

        numrevs = len(r)
        ui.write("# rev p1rev p2rev start   end deltastart base   p1   p2"
                 " rawsize totalsize compression heads chainlen\n")
        ts = 0
        heads = set()

        for rev in xrange(numrevs):
            dbase = r.deltaparent(rev)
            if dbase == -1:
                dbase = rev
            cbase = r.chainbase(rev)
            clen = r.chainlen(rev)
            p1, p2 = r.parentrevs(rev)
            rs = r.rawsize(rev)
            ts = ts + rs
            heads -= set(r.parentrevs(rev))
            heads.add(rev)