test-stress(disk): box rootfs is a bounded, isolated disk that survives a fill#623
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test-stress(disk): box rootfs is a bounded, isolated disk that survives a fill#623G4614 wants to merge 2 commits into
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A box must not see or exhaust the host filesystem. This integration test starts an alpine box and checks that its `/` is its own small ext4 (a few hundred MB, sized from the image — not the host's tens of millions of 1K-blocks), then fills it with dd and asserts the write hits ENOSPC rather than wandering onto the host disk, and that the VM stays Running and serving exec afterward. Covers the box-internal disk quadrant (the per-box blast radius), complementing the host-disk admission guard. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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…lf-bounded The existing test proved one box's rootfs is bounded and survives a fill, but not that boxes don't share a disk pool. Add a two-box test: fill the victim's rootfs to ENOSPC and assert the bystander keeps its free space, still accepts writes, and both VMs stay alive — the per-box disk boundary the title claims. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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A box's writable rootfs is its own image-sized ext4 far below the host disk, so a runaway writer is capped at its own size — this adds the integration coverage that a box can neither see nor exhaust the host filesystem.
Test plan
make test:integration:rust FILTER=box_rootfs_is_bounded_isolated_and_survives_fill→ passes./is its own small ext4, fills it to ENOSPC, and confirms the VM stays up./total (1K-blocks)/withddRunning, freshexecstill works