`brew update --quiet` fails all of a sudden

[dscho]

• are reporting a bug others will be able to reproduce and not asking a question. If you're not sure or want to ask a question do so on our Discourse: https://discourse.brew.sh
• ran a brew command and reproduced the problem with multiple formulae? If it's a problem with a single, official formula (not cask) please file this issue at Homebrew/homebrew-core: https://github.com/Homebrew/homebrew-core/issues/new/choose. If it's a brew cask problem please file this issue at https://github.com/Homebrew/homebrew-cask/issues/new/choose. If it's a tap (e.g. Homebrew/homebrew-php) problem please file this issue at the tap.
• ran brew update and can still reproduce the problem?
• ran brew doctor, fixed all issues and can still reproduce the problem?
• ran brew config and brew doctor and included their output with your issue?

What you were trying to do (and why)

I tried to run brew update --quiet in Travis and Azure Pipelines. This is actually what git.git does for ages, and it broke recently. It is also what Git for Windows does, and it also broke recently.

What happened (include command output)

Command output

$ brew update --quiet
Usage: brew update_report [--preinstall]
The Ruby implementation of brew update. Never called manually.
    --preinstall                 Run in 'auto-update' mode (faster, less
                                 output).
-f, --force                      Override warnings and enable potentially
                                 unsafe operations.
-d, --debug                      Display any debugging information.
-v, --verbose                    Make some output more verbose.
-h, --help                       Show this message.

Error: invalid option: --quiet

What you expected to happen

I expected no output and no failure, as e.g. here.

[EDIT] It was pointed out that there is output (despite what one might expect of --quiet), as can easily be seen by the linked log output. But it did succeed previously, and now it fails.

Step-by-step reproduction instructions (by running brew commands)

brew update --quiet

For your convenience, I set up https://github.com/dscho/brew-update-quiet-mcve which is hooked up to an Azure Pipeline running the command (see latest build output), including PR builds (read: you can trigger new builds by editing azure-pipelines.yml and opening a Pull Request).

[dscho]

Thank you for the prompt fix, @GauthamGoli & @reitermarkus !