Isolatable CLI commands

[brandonkelly]

Description

Adds an --isolated option to all CLI commands, which will ensure they are run in isolation.

If another request is already running the same command, it will abort with the stderr message The <command name> command is already running. and exit code 1.

(Isolation checking is done via the mutex, which only works when Dev Mode is disabled.)

Examples:

php craft up --isolated

php craft queue/listen --verbose --isolated

php craft gc --isolated

Related issues

• Implementing a single-worker queue module in a load-balanced environment #12337

[linear]

DEV-1045 Isolatable CLI commands

It should be possible to add an --isolate option to any CLI command, to ensure the command is run in isolation.

Similar to artisan migrate (https://twitter.com/taylorotwell/status/1587447931090731009).