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Sandboxes · 2 November 2026

Bucket mounts succeed and stay mounted

POST /v1/sandboxes/{id}/mounts checked whether the mount's client was still running by the size of its cgroup's process list, which the kernel always reports as 0. Every mount was therefore taken for a client that had exited: the request returned 422 mount_failed with "the bucket did not mount", and the client was stopped even when the bucket had mounted. The check now reads the process list itself. A mount returns 200 once the bucket is mounted, GET /v1/sandboxes/{id}/mounts reports mounted: true for it, and POST /v1/sandboxes/{id}/mounts:unmount waits for the client to exit before it returns.

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