Upgrading az MSI installation in non-interactive way

[nascarsayan]

Related command

az upgrade

Is your feature request related to a problem? Please describe.

When azure CLI is installed via MSI in windows, there is no method of automated upgrade using script. az upgrade will invoke msiexec.exe which opens up a separate window, and the user has to follow the steps (by clicking Next, etc.).

Describe the solution you'd like

az upgrade might take in a parameter --yes for automated MSI installation of the latest version. Else, we can make automated installation the default / only behaviour.

Basically, I propose that we need to have an automated upgrade mechanism without user intervention.

Describe alternatives you've considered

From our installation / onboarding script, I manually check the latest version available by parsing setup.py, similar to how az upgrade code snippet does. If the installed version is not equal to the latest version, I download and install the MSI in non-interactive way.
This roundabout method can be replaced by az upgrade if there is a non-interactive way for az upgrade.

Additional context

[yonzhan]

Thank you for opening this issue, we will look into it.

[jiasli]

As far as I know, there are some technical difficulties preventing us from doing this.

As shown in #26464, the MSI installation GUI shows a warning if python.exe is occupied but needs to be updated, so we want to make az upgrade non-blocking in that PR. With the MSI installation GUI, the user can still know if the MSI installation has finished. But if we make the MSI installation non-interactive and az upgrade non-blocking by exiting the current python.exe process, there will be no way to know if the MSI installation has finished (succeeded/failed).

A workaround I can currently think of is to develop a separate script independent from Azure CLI, so that it can upgrade Azure CLI without launching Azure CLI.