Git fetch a specific commit by hash

Question

Git allows to fetch from any given remote and reference, for example

git fetch  

So that those given com

Answer 1

See "Pull a specific commit from a remote git repository":
With Git 2.5 (July 2015), you will be able to do:

git fetch --depth=1  $SHA1
git cat-file commit $SHA1

If the SHA1 is "reachable" from one of the branch tips of the remote repo, then you can fetch it.

Caveat: you need a Git 2.5 remote repo server though, which will handle the uploadpack.allowReachableSHA1InWant config (and you need that config to be set to true, in order to allow a single commit fetch).