Post-migration script

[s-i-m-o-n-w]

Hi, I'd like to run a privileges script after every migration. Is this possible with DBMate?

[dossy]

Executing a script after each migration is applied is not currently possible within dbmate, or at least I cannot imagine a way to do so.

What is the use case you're looking to implement? Maybe there is an alternative solution that is possible.

[s-i-m-o-n-w]

Hi @dossy , I have a multi-tenant db (client per schema). DBMate runs migrations and builds new tenants very nicely. Currently I have to manually run a script to grant privileges to IT staff groups (Support, Dev, QA etc) to any new tenants. It would be great to have that automated. I know I could have a job that looks periodically for new schemas, but would like it all happen in one go if possible.

[dossy]

If you need a single script executed after executing dbmate, you could wrap your execution of dbmate into a shell script that executes dbmate then executes your additional script. That would be the recommended approach.

If you need a script executed in between individual migration files as dbmate applies them in order, that's not something that dbmate is currently capable of. If dbmate up took a --limit argument to control the number of migrations applied per run, it would be hypothetically possible to write a shell script that invoked dbmate in a loop, applying --limit 1 migration file at a time, until there are no more migrations left to apply.

It sounds like you only need a single script executed once after dbmate applies 0 or more migrations, which would best be handled by a wrapper script that invokes dbmate then the script afterwards, which you could do today without any changes to dbmate.

[s-i-m-o-n-w]

Thanks ever so much dossy for taking the time to reply. That's really helpful and greatly appreciated.