Berry: [Bug] Not running simple yarn install

[sibelius]

• [ ] I'd be willing to implement a fix

Describe the bug

A clear and concise description of what the bug is.
I've tried to run yarn install here (https://github.com/sibelius/yarn-workspaces-slow) and got the following error:

I did this

yarn policies set-version v2
````

yarn install

Usage Error: The project in /app/package.json doesn't seem to have been installed - running an install there might help
```

the repo was like this:

/app/yarn-workspaces-slow

To Reproduce

The _minimal_ information needed to reproduce your issue (ideally a package.json with a single dep). Note that bugs without minimal reproductions might be closed.

IMPORTANT: We strongly prefer reproductions that use Sherlock. Please check our documentation for more information: https://next.yarnpkg.com/advanced/sherlock

run yarn berry here https://github.com/sibelius/yarn-workspaces-slow

Screenshots

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Environment if relevant (please complete the following information):

• OS: [e.g. OSX, Linux, Windows, ...] mac
• Node version [e.g. 8.15.0, 10.15.1, ...] 12.13.0
• Yarn version [e.g. 2.0.0-rc1, ...] 2.0.0-rc.19

Additional context

Add any other context about the problem here.

[arcanis]

Do you by any chance have a yarn.lock in /app? The error message doesn't reference the cloned project, which leads me to believe that Yarn thinks /app is the root of your app. This should only happen if you have a lockfile in an ancestor folder.

[willgriffiths]

FWIW, I could reproduce. I had unused yarn.lock files in two ancestor files. Deleting them fixed it for me.

~/yarn.lock
~/Projects/yarn.lock

[sibelius]

I can confirm that this is the case

but should this work? as it worked with yarn, but no work with berry?

[sibelius]

I've deleted all package.json and yarn.lock from other packages

but I got this error

Usage Error: The project in /Users/sibelius/package.json doesn't seem to have been installed - running an install there might help

/Users/sibelius/ is my home dir ~

the problem now is that there are no package.json there to be excluded

[willgriffiths]

the problem now is that there are no package.json there to be excluded

Sorry if I'm making you repeat yourself but did you also remove a yarn.lock from the home dir? /Users/sibelius/yarn.lock

Yarn 2 supports nested workspaces which may relate to the change in behaviour. arcanis would know more.

[sibelius]

got working here

there are a yarn.lock there on home dir as well

[willgriffiths]

Thanks for creating an issue @sibelius. I added a feature request based on your feedback.

Let us know if you hit any other blockers with yarn 2. :)