`cargo update --config net.git-fetch-with-cli=true` fetches using git2

[epage]

Problem

As reported in renovatebot/renovate#29277

• Private git repo dependency fetching worked on 1.77 but not 1.78
• They used net.git-fetch-with-cli=true on the command-line

I git bisected it to #13479, specifically f525e1f

Steps

$ git clone https://github.com/crate-ci/cargo-release.git
$ cd cargo-release
$ rm -rf ~/.cargo/git  # avoiding the github fast path
$ cargo update --config net.git-fetch-with-cli=true

Notice that the fetch is done using libgit2 instead of git. To make this more obvious, I ran from master with a dbg! around the git_fetch_with_cli check at

cargo/src/cargo/sources/git/utils.rs

Line 1008 in d04355a

if let Some(true) = gctx.net_config()?.git_fetch_with_cli {

Possible Solution(s)

No response

Notes

No response

Version

No response

[weihanglo]

I wonder why nobody has reported this. Maybe --config is not a thing people know its existence 😅