Share a .stack folder between different users

[Ben MacAdam]

Hi,

I'm trying to figure out a way to share the same .stack file between different users, including one user who will not have write access to the .stack file. The specific use case I'm interested in is setting up a global .stack for a university lab, so that students in the class I'm TAing can use stack without running up against storage constraints. Ideally this would allow for a shared pantry, since some projects can still use upwards of 1GB of packages.

Thanks,

Ben

[Steven Shaw]

Assuming your students are logged into the same machine you should be able to use the STACK_ROOT environment variable. You should be able to use OS permissions to prevent write access to a particular user.

[Ben MacAdam]

There seems to be an issue trying this out on my own machine - the students seem to need write access to stack.sqlite3.pantry-write-lock

>/Users/ROOT_ACCOUNT/.stack/pantry/pantry.sqlite3.pantry-write-lock: openFd: permission denied (Permission denied)

Is there any way to have a local lock file?

[Steven Shaw]

I don't think you want to have a local lock file. I imagine it's there to prevent corruption when used from multiple processes.

Assuming your student are in the same group, try this:

chmod g+w "${STACK_ROOT}/stack.sqlite3.pantry-write-lock"
chmod g+w "${STACK_ROOT}/pantry/pantry.sqlite3.pantry-write-lock"
echo 'allow-different-user: true' >>"${STACK_ROOT}/config.yaml"

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