Re: [PATCH v3 07/14] commit-graph: update graph-head during write

Junio C Hamano [off-list ref] writes:

Derrick Stolee [off-list ref] writes:

quoted

It is possible to have multiple commit graph files in a pack directory,
but only one is important at a time. Use a 'graph_head' file to point
to the important file. Teach git-commit-graph to write 'graph_head' upon
writing a new commit graph file.

Why this design, instead of what "repack -a" would do, iow, if there
always is a singleton that is the only one that matters, shouldn't
the creation of that latest singleton just clear the older ones
before it returns control?

Note that I am not complaining---I am just curious why we want to
expose this "there is one relevant one but we keep irrelevant ones
we usually do not look at and need to be garbage collected" to end
users, and also expect readers of the series, resulting code and
docs would have the same puzzled feeling.