On Wed, Feb 10, 2021 at 04:10:58PM -0500, Jeff King wrote:
> On Wed, Feb 10, 2021 at 09:56:45PM +0100, SZEDER Gábor wrote:
>
> > > +test_bitmap_traversal () {
> > > + if test "$1" = "--no-confirm-bitmaps"
> > > + then
> > > + shift
> > > + elif cmp "$1" "$2"
> > > + then
> > > + echo >&2 "identical raw outputs; are you sure bitmaps were used?"
> > > + return 1
> >
> > Since you converted two 'error's to BUG earlier in this series...
> >
> > This helper function was added in ea047a8eb4 (t5310: factor out bitmap
> > traversal comparison, 2020-02-14), and so I Cc: its author and quote
> > part of its commit message:
> >
> > While we're at it, let's also try to confirm that the bitmap output did
> > indeed use bitmaps. Since the code internally falls back to the
> > non-bitmap path in some cases, the tests are at risk of becoming trivial
> > noops.
> >
> > This is a bit fragile, as not all outputs will differ (e.g., looking at
> > only the commits from a fully-bitmapped pack will end up exactly the
> > same as the normal traversal order, since it also matches the pack
> > order). So we'll provide an escape hatch by which tests can disable this
> > check (which should only be used after manually confirming that bitmaps
> > kicked in).
> >
> > Shouldn't this be a BUG as well? I think this should be a BUG.
>
> I dunno. I guess you are thinking of the case where somebody adds a new
> caller but fails to invoke Git correctly. Which would be a bug in the
> test script.
>
> But it could also easily be due to Git changing how it behaves in a
> certain circumstance. And maybe the solution is changing the test to
> adapt, or maybe we just found a bug in Git.
Well, I though that if the raw output is the same with and without
pack bitmaps, then the missing '--no-confirm-bitmaps' option is the
bug in the test script.
> TBH, I do not care that much either way. Either way, I think somebody
> would notice the problem.
Me neither, I just don't like test helper functions that simply return
in the middle, becauase that makes suppressing their trace output even
more awkward than it already is :)
