Git and sparse-checkout on large monorepos - hiding irrelevant changes for a sparse-checkout specification?

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Hi,

I posted an "Is this possible?" question on stackoverflow
(https://stackoverflow.com/q/61326025/74296) and was pointed here.

I understand from recent updates that there is increasing built-in
support for large files and large repos, between some of the older
capabilities (sparse checkout in general and shallow clone), and the
newer ones (partial-clone and git-sparse-checkout).

I'm playing with a large repo, and finding some "rough edges" around
large diffs (eg 200,000 files "added" in the "initial" commits of
shallow clones).

I was hoping these could be smoothed out when using sparse checkout
(where each user would only see say 30,000 of those 200,000 files),
but can't figure out a way to easily & consistently apply the
.git/info/sparse-checkout specification to tools like git-diff and
git-log (across many users with some semblance of consistency).

Is this something that is or is expected to be supported at some point?

While I'm asking, I have two less-important questions:

1) Are there any plans to support a filter along the lines of "keep
blobs used for commits since date X handy"? I know I can do a shallow
clone, then turn on filtering/promisors, and then unshallow, but then
later fetches don't bring in binaries - a mode that provides this
"full commit history but recent blobs only" might be nice? (I imagine
that's probably non-trivial, because the filters are probably based on
properties of the blobs themselves... but one can dream?)

2) Is there a target date for when git-sparse-checkout will become
non-experimental?

Thanks for any help, my apologies if my questions are too forward.

Best regards,
Tao Klerks



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