Re: git download

[ZheNing Hu <adlternative@gmail.com>]

Hi,

Vasilij Demyanov <qvasic@gmail.com> 于2022年11月24日周四 01:27写道：
>
> Hello everybody!
>
> I have a need to get just one file from a repository, it would be
> useful to have a command something like this:
>
> git download repo_url branch_or_commit path/to/file
>
> Or maybe there is something like this, I just haven't found it in the docs?
>

If the git server support partial-clone (uploadpack.allowFilter),
maybe you can use this way:

    git clone --depth=1 --single-branch --branch=main --no-checkout
--filter=blob:none
git@github.com:derrickstolee/sparse-checkout-example.git
    cd sparse-checkout-example
    git sparse-checkout set --no-cone "/README.md"
    git checkout main

it will only download single commit, multiple tree, and one blob.

If the server supports fetch any objects
(uploadpack.allowAnySHA1InWant) and you already know the
file's SHA1, there is a kind of black magic here:

    git init repo
    cd repo
    git remote add origin <repo>
    git -c fetch.negotiationAlgorithm=noop fetch force --no-tags
--no-write-fetch-head --filter=blob:none --stdin
    <blob-oid>

You will get only one blob, "git cat-file -p <blob-oid>" to view the
contents of this file.

Note these two performance maybe not better than git archive or some
file pages support by git server
directly such as
https://raw.githubusercontent.com/derrickstolee/sparse-checkout-example/main/README.md

> Best regards,
> Vasyl

--
ZheNing Hu