Re: Feature Request: Check if commit is existent via http-protocol

From: Jonathan Tan <jonathantanmy@google.com>
Date: Nov 14, 2019, 20:05 UTC
Message-ID: <20191114200553.166098-1-jonathantanmy@google.com>
In-Reply-To: <c5147250-4af2-0e98-db6e-20602a38fba4@gmail.com>

> 1) You can request a specific list of commits of a branch by index (e.g. 
> "1 to 30 <sha1 of branch>" would send the first 30 commits from the 
> server to the client of the branch "master"

If your Git server supports it, a partial solution is to do a partial clone, e.g.:

  git clone --filter=tree:0 --bare \
    https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux

And you can add --depth=10 if you want the last 10 commits in that branch too:

  git clone --filter=tree:0 --bare --depth=10 \
    https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux

This creates a partial clone with no local trees or blobs. If you're just doing ancestry checks with "git merge-base", that should be sufficient. (If you're doing anything else, trees and blobs will be downloaded as Git needs them.)