[turborepo] Concurrency option not ignored when Parallel execution flag is set

[nderscore]

What version of Turborepo are you using?

1.8.4 - 1.8.8

What package manager are you using / does the bug impact?

pnpm

What operating system are you using?

Mac

Describe the Bug

According to the docs, the --concurrency option will be ignored if the --parallel flag is also passed.

Since turborepo v1.8.4, this is no longer the behavior. Setting the --parallel CLI flag does not disable the --concurrency setting when a task is persistent.

In a project with more than 10 packages, the following error message is presented for a task with the option "persistent": true:

ERROR  run failed: error preparing engine: Invalid persistent task configuration:
You have {N} persistent tasks but `turbo` is configured for concurrency of 10. Set --concurrency to at least {N+1}

Expected Behavior

Setting --parallel should override the --concurrency option.

This was the existing behavior in turborepo v1.8.3

To Reproduce

Execute a --parallel task in a workspace with >10 packages and "persistent": true in the task's settings

Reproduction Repo

No response

[mmachatschek]

We also bumped into this issue after migrating turbo from v1.7 to 1.9

[gsoltis]

Looks like we weren't checking for --parallel before doing some validation. I'll see if we can fix that quickly: #5191