Re: [QUESTION]: How to get uploading git objects via a git command in a pre-receive-hook
On Sat, Jun 29, 2024 at 06:29:41PM +0200, Christian Couder wrote:
Show 12 quoted lines
> > I want to check the uploaded Git LFS objects in the pre-receive hook
> > of the Git server. Assuming that the Git repository during the upload
> > process is A.git, my current approach is to create an empty repository
> > B.git and then use
> > GIT_ALTERNATE_OBJECT_DIRECTORIES="A.git/objects/tmp_objdir-incoming-**"
> > followed by executing git -C B.git cat-file --batch-check
> > --batch-all-objects to obtain the objects being uploaded, then filter
> > out the LFS objects. This process is very time-consuming, taking
> > roughly more than 10 seconds. I wonder if there's a simpler method?
>
> I wonder if it's possible to use `git verify-pack --verbose` on the
> received packfile.
By the time the pre-receive hook is running, we've indexed the pack. So you can just find the pack in the tmpdir (via GIT_QUARANTINE_PATH) and run "git show-index" against it, which is much faster. Keeping in mind that the pack could also have been exploded to loose objects if it's small, in which case you'd need to use "find" or similar to enumerate the loose object files.
In theory you could use "cat-file --batch-all-objects", but I suspect the reason it takes a long time is that it has access to all of the original objects in the repo, too (and so is enumerating those). You might be able to get away with unsetting various GIT_* variables to avoid that, but I think the result would be kind of fragile.
-Peff
ZheNing Hu
