cargo build fails with git dependency in rust 1.44

[Roguelazer]

Problem
Since Rust 1.44, cloning git dependencies fails the first time with an error like the following:

$ cargo build
    Updating git repository `ssh://git@internal-server/path/to/git-repo.git`
error: failed to get `internal-lib-name` as a dependency of package `internal_project v0.1.0 (/Users/jbrown/work/easypost/internal-project)`

Caused by:
  failed to load source for dependency `internal-lib-name`

Caused by:
  Unable to update ssh://git@internal-server/path/to/git-repo.git?tag=v0.1.0#f582cac3

Caused by:
  failed to clone into: /Users/jbrown/.cargo/git/db/internal-lib-name-835eff812df18c1c

Caused by:
  failed to authenticate when downloading repository
attempted ssh-agent authentication, but none of the usernames `git` succeeded

Caused by:
  failed to map '1'; class=Config (7)

Rerunning cargo build a second time always succeeds.

This worked fine in 1.43.

Steps

1. Attempt to build a repo with a git dependency

Possible Solution(s)
Working on trying to make a minimal reproducer; figured I'd file this first.

Notes

Output of cargo version: cargo 1.44.0 (05d080faa 2020-05-06) (repros on macOS and Linux)

[Roguelazer]

Here's a minimal reproducer using one of the open-source libraries I maintain:

$ cargo new --bin issue-8352-test
     Created binary (application) `issue-8352-test` package
$ cd issue-8352-test
$ cat >Cargo.toml <<EOF
[package]
name = "i8352test"
version = "0.1.0"
authors = ["James Brown <jbrown@easypost.com>"]

[dependencies]
mysql_binlog = { git = "ssh://git@github.com/EasyPost/rust-mysql-binlog", tag = "0.3.0", version = "0.3.0"}
EOF
$ cargo build
    Updating git repository `ssh://git@github.com/EasyPost/rust-mysql-binlog`
error: failed to get `mysql_binlog` as a dependency of package `i8352test v0.1.0 (/Users/jbrown/tmp/2020-06-11/issue-8352-test)`

Caused by:
  failed to load source for dependency `mysql_binlog`

Caused by:
  Unable to update ssh://git@github.com/EasyPost/rust-mysql-binlog?tag=0.3.0

Caused by:
  failed to fetch into /Users/jbrown/.cargo/git/db/rust-mysql-binlog-e9f9b299f3d76a53

Caused by:
  failed to authenticate when downloading repository
attempted ssh-agent authentication, but none of the usernames `git` succeeded

Caused by:
  failed to map '1'; class=Config (7)

[ehuss]

failed to map indicates the git library failed to parse your .gitconfig. Can you narrow down which part of your .gitconfig is causing the error and post it here?

Also, FYI, your reproduction has a small mistake (the tag needs v as in tag = "v0.3.0").

[Roguelazer]

It appears to be

[core]
    logAllRefUpdates = 1

which causes the issue

Perhaps your gitconfig parser does not handle 1 as an alias for true?

[ehuss]

Yea, looks like an issue in the libgit2 library. I have filed a report at libgit2/libgit2#5555. A workaround is to use true.

I'm not yet sure why running twice works. For some reason, the second run thinks the repo is up-to-date. Perhaps the error happens late enough that the repo is partially updated. It will take some more investigation to figure that out.

[njerschow]

git clean -f fixed this for me

[JuiceDrinker]

If you ran into this and can clone using git cli adding --config net.git-fetch-with-cli=true to the end of your cargo command will fix it for you