Warnings/errors from "brew edit" commands being routed to standard output.

[btb]

Description

This unusual routing prevents the normal output from being captured in a variable and used.

I see the problem doesn't occur on the macos-11 runner, but it does occur on every other macos runner I tried.
I see that the version of homebrew is older on the macos-11 runner (4.2.5) whereas the other runners use homebrew 4.3.0. But I don't think this is the whole problem, since I cannot reproduce this problem on my own machine running macos 14 and homebrew 4.3.0.

Platforms affected

• Azure DevOps
• GitHub Actions - Standard Runners
• GitHub Actions - Larger Runners

Runner images affected

• Ubuntu 20.04
• Ubuntu 22.04
• Ubuntu 24.04
• macOS 11
• macOS 12
• macOS 13
• macOS 13 Arm64
• macOS 14
• macOS 14 Arm64
• Windows Server 2019
• Windows Server 2022

Image version and build link

20240514.3

Is it regression?

yes

Expected behavior

When using a command brew edit --print-path [formula] the result should be printed on stdout, allowing you to capture the output for use in other commands. Any warnings should be printed on stderr.

    sdl_image_formula=$(brew edit --print-path sdl_image)
    echo sdl_image_formula: $sdl_image_formula

should result in something like:

Warning: edit is a developer command, so Homebrew's
developer mode has been automatically turned on.
To turn developer mode off, run:
  brew developer off

Warning: `brew install` ignores locally edited casks and formulae if
HOMEBREW_NO_INSTALL_FROM_API is not set.
sdl_image_formula: /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/s/sdl_image.rb

where you see the errors/warnings as the command is run, then you see the captured formula path afterward.

Here's a run showing that it used to work in macos-14-arm64:
https://github.com/btb/d2x/actions/runs/8953473131/job/24592024810

Here's a run showing it still works normally using the macos-11 runner: https://github.com/btb/d2x/actions/runs/9121219819/job/25080022032

Actual behavior

The warnings/errors are somehow being routed to the standard output, so they are improperly captured in the variable.

    sdl_image_formula=$(brew edit --print-path sdl_image)
    echo sdl_image_formula: $sdl_image_formula

results in:

Warning: edit is a developer command, so Homebrew's
developer mode has been automatically turned on.
To turn developer mode off, run:
  brew developer off

Warning: `brew install` ignores locally edited casks and formulae if
HOMEBREW_NO_INSTALL_FROM_API is not set.
sdl_image_formula: ::warning::`brew install` ignores locally edited casks and formulae if%0AHOMEBREW_NO_INSTALL_FROM_API is not set.%0A /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/s/sdl_image.rb

Here's the run where it stopped working in macos-14-amd64: https://github.com/btb/d2x/actions/runs/9120125848/job/25077018332

Repro steps

Run the 'brew edit' command in a "run" shell, and capture its output to a variable
.

[erik-bershel]

Hey @btb!

Good first issue. I cannot reproduce faulty behaviour on my macOS-14 too. Seems to be the real case. We'll check what might be done to resolve it.

[sergei-pyshnoi]

Hello @btb . After investigation we found that problem could be in new runner version. Behavior also reproducible using self-hosted runner on local MacOS machine , so unfortunately we cannot do nothing from our side with it. You can create issue in runner repo for fixing it in a future. As workaround you can enable brew developer mode and set HOMEBREW_NO_INSTALL_FROM_API variable in runtime for avoiding warnings. I am closing issue but you if you have additional questions feel free to reach me out.