Re: BUG: config.c:129: kvi should not be set while parsing a config source

[Derrick Stolee <derrickstolee@github.com>]

On 6/21/2023 7:45 PM, Jesse Kasky wrote:
> Thank you for filling out a Git bug report!
> Please answer the following questions to help us understand your issue.
> 
> What did you do before the bug happened? (Steps to reproduce your issue)
> 
> git clone --no-checkout --sparse --filter=blob:none --depth=1 <repo> <dir>

I'll note the oddity of using a blobless clone filter alongside a
shallow clone. This is something we are not super-likely to do
very often, so I could see how it is skipped by our test suite.

> cd <dir>
> git sparse-checkout add <dir1> <dir2>
> git fetch --depth=1 origin <commit>

Especially this fetch after the clone. Shallow clones are better to
only clone, then throw away. Don't fetch from them again. That said,
we shouldn't be hitting a BUG statement.

> Received the following error:
> 
> BUG: config.c:129: kvi should not be set while parsing a config source
> [1]    5842 abort      /opt/homebrew/bin/git fetch --depth=1 origin

I've come across this error while playing around with things in
the config space, and the case I figured out was due to nested
iterations over config.

In my case, I was adding dynamic config loading when certain
global variables were used, and some were used during config
parsing causing this nesting.

That's where I would start investigating, but don't have time to
dig in more than to contribute my experience with this BUG
statement.

> Two items I came across while trying to troubleshoot:
> https://github.com/git/git/commit/9828453ff00b330c57daa3a8b672cbb5f0cdce34

I have CC'd Glen, the author of that commit, and an experienced
contributor in this space.

Thanks,
-Stolee