fuse: add host FD passthrough for external FUSE servers#13575
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## Summary - Add `hostConnection` type that performs synchronous FUSE protocol I/O over a host file descriptor, enabling FUSE servers running outside the sandbox to serve filesystem requests for processes inside - Detect host FDs in `GetFilesystem` via a `HostFD()` interface check and branch to a new `getFilesystemHostFD` path that creates the host connection and performs `FUSE_INIT` synchronously - Route all `Call`/`CallAsync` operations through `fuseCall`/`fuseCallAsync` dispatch methods on `filesystem` that forward to `hostConn` when set ## Test plan - [x] Unit tests (`host_connection_test.go`): basic echo call, FUSE_INIT handshake, async call, not-connected error — all using socketpair-based mock servers - [x] Integration tests (`host_connection_integration_test.go`): full FUSE protocol lifecycle (INIT → LOOKUP → OPEN → READ → RELEASE and WRITE → verify backing file) with a real temp directory-backed FUSE server - [x] Syscall integration tests (`fuse_host.cc`): `StatRoot`, `ReadFile`, `WriteAndReadBack` — exercised via the `_fuse_host` test runner variant with host-side `fuse_host` server binary - [x] Existing FUSE tests pass (no regressions to the DeviceFD path) FUTURE_COPYBARA_INTEGRATE_REVIEW=#13426 from google:lucasmanning/fuse-host-passthrough d4129db PiperOrigin-RevId: 936180483
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fuse: add host FD passthrough for external FUSE servers
Summary
hostConnectiontype that performs synchronous FUSE protocol I/O over a host file descriptor, enabling FUSE servers running outside the sandbox to serve filesystem requests for processes insideGetFilesystemvia aHostFD()interface check and branch to a newgetFilesystemHostFDpath that creates the host connection and performsFUSE_INITsynchronouslyCall/CallAsyncoperations throughfuseCall/fuseCallAsyncdispatch methods onfilesystemthat forward tohostConnwhen setTest plan
host_connection_test.go): basic echo call, FUSE_INIT handshake, async call, not-connected error — all using socketpair-based mock servershost_connection_integration_test.go): full FUSE protocol lifecycle (INIT → LOOKUP → OPEN → READ → RELEASE and WRITE → verify backing file) with a real temp directory-backed FUSE serverfuse_host.cc):StatRoot,ReadFile,WriteAndReadBack— exercised via the_fuse_hosttest runner variant with host-sidefuse_hostserver binaryFUTURE_COPYBARA_INTEGRATE_REVIEW=#13426 from google:lucasmanning/fuse-host-passthrough d4129db