Unexpected behavior with branch.*.{remote,pushremote,merge}

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I have a few repositories on my system that exist primarily as local copies of remote repositories, in that I normally just want to track and follow the upstream project (however, I periodically contribute back upstream so they are technically forks -- origin is my remote, upstream is theirs).

In these repositories, I set the following configuration:

```
[remote "origin"]
  url = https://git.foo.com/me/bar.git
  fetch = +refs/heads/*:refs/remotes/origin/*
[remote "upstream"]
  url = https://git.foo.com/them/bar.git
  fetch = +refs/heads/main:refs/remotes/upstream/main
  tagopt = --no-tags
[branch "main"]
  remote = upstream
  pushRemote = origin
  merge = refs/heads/master
  rebase = true
```

Based on my understanding of the branch configuration options, this should effectively force my local `main` branch to track against `upstream/main`, but push to `origin/main`. I notice what I believe to be odd behavior when fetching: that FETCH_HEAD doesn't resolve to `upstream/main` as I would expect:

```
➜ git fetch --all
Fetching origin
Fetching upstream
remote: Enumerating objects: 23, done.
remote: Counting objects: 100% (23/23), done.
remote: Total 32 (delta 23), reused 23 (delta 23), pack-reused 9
Unpacking objects: 100% (32/32), 12.97 KiB | 949.00 KiB/s, done.
>From https://git.foo.com/them/bar
   63f7159..e65b80e  main     -> upstream/main


➜ git status -sbu
## main...upstream/main [behind 9]


➜ git rev-parse HEAD upstream/main origin/main FETCH_HEAD
63f71597979edb16cb9f80d0431115e22dcb716d
e65b80edd2a2162f67120a98e84bb489f15fcf97
23e6881719f661c37336d9fcf7a9005a7dfce0cf
23e6881719f661c37336d9fcf7a9005a7dfce0cf
```

As we see from the output, `FETCH_HEAD` is resolving to the same commit as `origin/main`, when I would instead expect it to resolve to the same commit as `upstream/main`. Here are the contents of `.git/FETCH_HEAD` in its entirety:

```
➜ cat .git/FETCH_HEAD
23e6881719f661c37336d9fcf7a9005a7dfce0cf        not-for-merge   branch 'main' of https://git.foo.com/me/foo
e65b80edd2a2162f67120a98e84bb489f15fcf97                branch 'main' of https://git.foo.com/them/foo
```

Curiously, `git rebase FETCH_HEAD` seems to think the local branch is up to date (erroneously), however `git-pull --rebase=true` and `git-merge FETCH_HEAD` both work as expected and merge/rebase with `upstream/main`.

Am I going about this incorrectly? The main purpose behind configuring my "mostly just a fork" repository is that it simplifies tracking against an upstream remote for projects which I do not work on actively. Of course, you might argue that I don't need to keep my remote around for this purpose and can just use a straightforward `git-clone` here -- but I'd rather not, and would prefer responses addressing the perceived bug rather than suggesting this particular alternative workflow.

-- 
  Ben Denhartog
  ben@xxxxxxxxxxxxx




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