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Fixes slice logic for PTD environment fetching #329

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Oct 7, 2025
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Fixes slice logic for PTD environment fetching #329

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8 changes: 7 additions & 1 deletion src/forge/controller/provisioner.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,13 @@ async def get_remote_info(host_mesh: HostMesh) -> tuple[str, str]:
"""Returns the host name and port of the host mesh."""
throwaway_procs = host_mesh.spawn_procs(per_host={"procs": 1})
fetcher = throwaway_procs.spawn("_fetcher", _RemoteInfoFetcher)
fetcher = fetcher.slice(procs=0)

# This will reduce something like extent = {"hosts": 2, "procs": 1} to
# {"hosts": 1, "procs": 1}.
singleton_slice = {k: slice(0, 1) for k in fetcher.extent.keys()}
fetcher = fetcher.slice(**singleton_slice)
# Fetcher should be a singleton at this point - call_one() will fail otherwise

host, port = await fetcher.get_info.call_one()
await throwaway_procs.stop()
return host, port
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