supabase / cli / 25158179731

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feat: add SUPABASE_HOSTNAME env var to override local service host (#4947)

feat: add SUPABASE_SERVICES_HOSTNAME env var for local service host

Allows the CLI to communicate with where supabase services are
listening when it differs from where the docker engine API is listening.

The concrete use case was running the CLI inside a dev container with
the host Docker socket bind-mounted. In that context 127.0.0.1 is the
container's own loopback, not the Docker host. Set
SUPABASE_SERVICES_HOSTNAME=host.docker.internal to reach sibling
containers via Docker Desktop's host gateway without proxying the Docker
socket.

---

AI assistance: Claude Sonnet 4.6 in Pi Agent
- Used to find root cause, propose fix options, draft code/test/docs.
- I ran supabase start inside the dev container, confirmed all services
  healthy, reviewed/edited all code changes/text.

Co-authored-by: Joel Martin <joelmartin@supabase.io>
Co-authored-by: Andrew Valleteau <avallete@users.noreply.github.com>

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