Re: cat-file: dies with --batch if reflog entry is out of bounds

From: Jeff King <peff@peff.net>
Date: Feb 12, 2026, 04:07 UTC
Message-ID: <20260212040708.GA1894049@coredump.intra.peff.net>
In-Reply-To: <2b07489b-1689-4ecd-9cda-012540fe56e2@app.fastmail.com>

On Thu, Feb 12, 2026 at 12:13:36AM +0100, Kristoffer Haugsbakk wrote:

Show 8 quoted lines

>     $ git cat-file --batch
>     HEAD@{7}
>     <commit>
>     branch@{20}
>     fatal: log for 'branch' only has 5 entries
>     [died]
> 
> This is a known limitation.

I expect there are others. E.g.:

  $ git checkout --detach
  $ echo @{upstream} | git cat-file --batch
  fatal: HEAD does not point to a branch

So I'd guess that there is probably a lot more work to be done on top of 393bbb21 to make GET_OID_GENTLY work consistently. But doing that will incrementally take us in a good direction (for cat-file and for other callers).

-Peff