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Message-ID: <defa2a66-598e-4721-a644-680de0116dec@kdbg.org>
Date:   Thu, 31 Aug 2023 19:10:28 +0200
MIME-Version: 1.0
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Subject: Re: Problem: `fatal: too-short tree object` when executing
 hash-object on tree
To:     Gareth Hayes <gareth.hayes@bitcoin.org.hk>
References: <0de414f8-f409-467f-a504-06a78f088981@app.fastmail.com>
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From:   Johannes Sixt <j6t@kdbg.org>
Cc:     git@vger.kernel.org
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Am 31.08.23 um 12:58 schrieb Gareth Hayes:
> Problem: I'm trying to reproduce the identifier of a tree object using `git cat-file -p <tree object identifier> | git hash-object -t tree --stdin`

XY-problem alert!?

> This results in an error:
> `fatal: too-short tree object`
> 
> To replicate: 
> `git cat-file -p HEAD`
> `git cat-file -p <tree object identifier from output of above> | git hash-object -t tree --stdin`
> 
> This works for other object types but not trees. What am I doing wrong?

Recall that the -p in cat-file means "pretty" (-print). The data that
makes up a tree object is far from pretty, hence, you can't feed it into
git hash-object directly.

You can either turn the pretty-printed input into a tree object

   git cat-file -p $treeoid | git mktree

or hash the raw data

   git cat-file tree $treeoid | git hash-object -t tree --stdin


-- Hannes