Re: [PATCHv2 6/7] builtin/describe.c: describe a blob

> >> I know id prefer the first commit that introduced the blob. That's
> >> what describing a commit does, it finds the oldest tag prior to the
> >> commit, while --contains finds the first tag that contains the commit
> >> as an ancestor.
> >
> > It is very easy to wish for "the oldest commit introducing a blob". But
> > since we're in a DAG, this question is not necessarily easy to answer:
> >
> > - A - B - C
> >     \   /
> >       D
> >
> > Let's assume that all commits except A have the blob, and that B and D
> > (for some reason) have the same author/committer dates.
> >
> > Do you identify B or D as the commit introducing the blob?
> 
> The current implementation gives C, though.
> (assuming C is HEAD, and A is ancient)
> 
> With the --reverse flag one of B or D is given (not sure which,
> depends on the exact order).