Junio C Hamano wrote:
But previous argument by Linus made in a distant (in git
timescale) past is now ingrained in my brain: "the additional
metadata" recorded at the commit time can only help us what we
envisioned in the past when the tool to record that metadata was
written. If we try to "track" by contents, we can do at least
the same (diff -M being able to tell renames is an example that
we can get away without having a UUID) and possibly better,
depending on how much effort we are willing to spend "drilling
down" when we actually need to know what happened at merge
time. What I found most important in that argument by Linus is
that the "drilling down" algorithm can improve over time while
"the additional metadata" specification is cast in stone when a
commit is made.
... unless the "additional metadata" is merely a cache, derived from the
contents. The advantage, of course, is that you can produce data that
is more expensive that way. On the other hand, if you don't need it,
it's pointless.
-hpa
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