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Implement fuse-projfs as an alternative to fuse-overlay for Windows. (#244)

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* Implement fuse-projfs to use ProjFS on WIndows.

* fix(pi-natives): prevent ProjFS session key mismatch and start race

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Co-authored-by: can1357 <me@can.ac>
This commit is contained in:
haram
2026-03-03 04:12:30 +01:00
committed by GitHub
parent 7ce8b6d5df
commit 801553b118
23 changed files with 1276 additions and 51 deletions
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packages/coding-agent/DEVELOPMENT.md
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@@ -906,9 +906,10 @@ Despite the name `runSubprocess`, `packages/coding-agent/src/task/executor.ts` c
What _is_ isolated is execution context and artifacts, not process memory:
- Optional filesystem isolation is controlled by the `task.isolation.mode` setting (`"none"`, `"worktree"`, or `"fuse-overlay"`).
- Optional filesystem isolation is controlled by the `task.isolation.mode` setting (`"none"`, `"worktree"`, `"fuse-overlay"`, or `"fuse-projfs"`).
- **worktree**: `ensureWorktree(...)`, `applyBaseline(...)`, `captureDeltaPatch(...)`, `cleanupWorktree(...)`. Nested non-submodule git repos are discovered and handled independently.
- **fuse-overlay**: `ensureFuseOverlay(...)` (mounts a copy-on-write overlay via `fuse-overlayfs`), `captureDeltaPatch(...)`, `cleanupFuseOverlay(...)`. No baseline apply needed since the overlay reflects the full working tree. Fails outright if mount fails.
- **fuse-overlay**: `ensureFuseOverlay(...)`, `captureDeltaPatch(...)`, `cleanupFuseOverlay(...)` using `fuse-overlayfs` on Unix hosts. On Windows, this mode falls back to `worktree` with a system notification.
- **fuse-projfs**: `ensureProjfsOverlay(...)`, `captureDeltaPatch(...)`, `cleanupProjfsOverlay(...)` using ProjFS on Windows. Missing ProjFS prerequisites fall back to `worktree` with a system notification; non-prerequisite startup errors still fail the task.
- The `task.isolation.merge` setting controls how isolated changes are integrated back:
- **patch** (default): captures a diff via `captureDeltaPatch(...)`, combines patches, and applies with `git apply`.
- **branch**: each task commits to a temp branch (`omp/task/<id>`) via `commitToBranch(...)`, then `mergeTaskBranches(...)` cherry-picks them sequentially onto HEAD. If `git apply` fails inside `commitToBranch`, the error is non-fatal — the agent result is preserved with a `merge failed` status.