Redirecting stdout causes the program to stop for 40 seconds

[miku1958]

• I was not able to find an open
  or closed issue matching
  what I'm seeing, including in the git-for-windows/git tracker.

Setup

• Which version of microsoft/git are you using? Is it 32-bit or 64-bit?
  64-bit

$ git --version --build-options

git version 2.40.1.vfs.0.2
cpu: x86_64
built from commit: 59bc9667c84164a4ad879d9b424687ca631f01b3
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
feature: fsmonitor--daemon

• Are you using Scalar or VFS for Git?

Scalar

• Which version of Windows are you running? Vista, 7, 8, 10? Is it 32-bit or 64-bit?

macOS 13.4.1

Details

• Which terminal/shell are you running Git from? e.g Bash/CMD/PowerShell/other

bash

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

#!/bin/bash
start=$(date +%s)

output=$(/usr/local/bin/git checkout 2>&1)

end=$(date +%s)

diff=$((end - start))
echo "git $@ | cost: $diff s"

• What did you expect to occur after running these commands?

It completes just as quickly as running git checkout directly

• What actually happened instead?

when I use /usr/local/bin/git checkout in the script, it takes 6 s, but when I try to save the output to a variable, it takes 45 s

I also change /usr/local/bin/git to /usr/bin/git to save the output, and Apple-git finish it immediately.

• If the problem was occurring with a specific repository, can you specify
  the repository?

  • Office monorepo

[dscho]

Is this really reproducible? I would expect the git checkout to be relatively slow when e.g. FSMonitor just started up, but to be fast otherwise.