to be honest, until I encountered this problem, I didn't know about gix, but it seems to cause problem when I build docs. below is the commands to reproduce this error:

❯ echo $env.PROCESSOR_ARCHITECTURE
AMD64

❯ ver

Microsoft Windows [Version 10.0.19045.4412]

❯ cargo --version
cargo 1.80.0-nightly (4de0094ac 2024-05-09)

❯ cargo new --lib dummy
    Creating library `dummy` package
note: see more `Cargo.toml` keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

❯ cd dummy\

❯ git add .

❯ cargo doc
error: failed to determine package fingerprint for documenting dummy v0.1.0 (Y:\dummy)

Caused by:
  failed to determine the most recently modified file in Y:\dummy

Caused by:
  failed to determine list of files in Y:\dummy

Caused by:
  The value for `core.excludesFile` could not be read from configuration

Caused by:
  path is missing

by grepping through the code base for the error messages and some experiments, I managed to pinpoint the failed code is at this line, where the repo.walkdir_iter() method returns Err:

I did some investigation of the gix code, and it turns out my git config file contains a blank value for core.excludesfile which gix treats differently than a missing core.excludesfile entry.

I opened an issue for gix GitoxideLabs/gitoxide#1370, but I want to at least mention it here, in case someone else enountered similar problem and want to search for reasons.

also, I'm not sure if this is considered a bug for gix or not, but at least it behaves differently from libgit2. when I browse the source code of cargo here:

I discovered this __CARGO_GITOXIDE_DISABLE_LIST_FILES environment variable )(undocumented anywhere) so I tried to set it, and then cargo doc runs without showing any errors.