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sandbox: keep the overlay upper on scratch or in RAM - #977

Merged

Pedro Henrique Penna (ppenna) merged 5 commits into

devfrom

agents/issue-558-ram-overlay-upper

Oct 29, 2026

Merged

sandbox: keep the overlay upper on scratch or in RAM#977
Pedro Henrique Penna (ppenna) merged 5 commits into
devfrom
agents/issue-558-ram-overlay-upper

Commits on Oct 29, 2026
- guest: assemble the layered root over a tmpfs upper
  
  Pedro Henrique Penna (ppenna)
  and
  Copilot
  committed
  5d43e0a
- guest: check the upper that the sandbox declares in the smoke probe
  
  Pedro Henrique Penna (ppenna)
  and
  Copilot
  committed
  d3f7847
- nvx-rs: select the sandbox's upper with --upper
  
  Pedro Henrique Penna (ppenna)
  and
  Copilot
  committed
  f122245
- tests: accept sandboxes whose overlay upper is in RAM
  
  Pedro Henrique Penna (ppenna)
  and
  Copilot
  committed
  fef707f
- doc: describe the RAM upper in the architecture guide
  
  Pedro Henrique Penna (ppenna)
  and
  Copilot
  committed
  27efb14