1 Commits

Include renames

Author	SHA1	Message	Date
Neil	fe0f2f9be7	perf(dev): share one Electron dist per repo instead of per worktree (#17664) ... * perf(dev): clone one Electron dist per repo instead of per worktree Every worktree extracted its own ~295MB node_modules/electron/dist, measured at 69GB across 241 worktrees on one machine. Extract once per repository into <git-common-dir>/orca-cache/electron, then APFS-clone it into each worktree: copy-on-write, so the second worktree allocates ~0 bytes and still gets a real, private, writable directory. Hangs off install-electron-package-binary.mjs, inside the transaction it already uses to swap dist. Every cache path returns a boolean and false means "install normally", so non-APFS, cross-volume, corrupt entry, no Git, folder workspace and CI all keep today's behavior. No symlinks, no lifecycle changes. out/electron-dev's per-branch Electron.app copy clones too, via the same helper. Refs #13709 * perf(dev): share the Electron dist on Linux and Windows too Extends the shared dist cache beyond macOS APFS. Three mechanisms, strongest isolation first: macOS APFS cp -c private copy-on-write Linux btrfs cp --reflink private copy-on-write ext4 / NTFS hardlink + 0555 shared inodes, forced read-only Reflinks cover btrfs/XFS/bcachefs/ZFS but not ext4, and Windows block cloning is ReFS-only, so most Linux and effectively all Windows developers need hardlinks to get any saving at all. Extracted dist is 327MB on linux-x64 and 374MB on win32-x64, both larger than macOS. Hardlinks share inodes, so a write through one worktree would rewrite every sibling and the cache. Nothing in this repo writes inside dist -- every mutation replaces the directory via rename -- but Electron's own install.js extracts over an existing dist with O_TRUNC, and is reachable through `pnpm rebuild electron`. Publishing the entry read-only turns that from silent cross-worktree corruption into EPERM. Directories stay writable so the install transaction's renames and unlinks still work. out/electron-dev's per-branch Electron.app is patched and codesigned after it is copied, so it uses copyPrivateTree, which never hardlinks. Refs #13709 * test(dev): keep shared-dist tests honest across ext4 and NTFS Verified on real hardware: Ubuntu 24.04/ext4 (no reflink support, so the hardlink tier is the only thing that helps there) and Windows/NTFS. Three tests faked platform: 'darwin' while invoking the real mechanism, so they failed on Linux where /bin/cp -c does not exist. Mechanism selection is now asserted with injected stubs; real filesystem behavior is asserted against whatever the host actually supports. Windows maps chmod onto the read-only attribute alone, so a directory never reports 0o755 and a read-only file reports 0o444. Mode-bit assertions that encoded POSIX semantics are now behavioral (the tree stays removable), and the executable-bit assertion is POSIX-only -- confirmed on NTFS that a read-only hardlinked .exe still runs. * fix(dev): stop a losing publisher from discarding a good cache entry Greptile caught a TOCTOU in the shared Electron dist cache. Quarantining an invalid entry happened before sharing the replacement tree, which takes seconds -- long enough for a sibling worktree to publish a good entry that this one would then rename away. If the follow-up publish also failed, the cache was left empty and every worktree re-downloaded. Stage first, then re-validate immediately before the destructive rename, so an entry that became good during the share is kept. On a failed swap, restore the quarantined entry instead of leaving no entry at all: a stale entry still beats an empty cache, because the next publisher re-validates and replaces it. An entry that cannot be validated is never displaced, matching the pre-staging rule. Also covers the Electron upgrade path end to end: a version bump gets its own cache entry and leaves the previous one for worktrees still on the old branch. * feat(dev): add a script to share existing worktrees' Electron dists An install only shares when Electron is (re)installed, and rebuild-native-deps returns early when the package is already usable -- so a worktree that already has a working dist never reaches the sharing path and keeps its own copy until the next Electron upgrade. pnpm reclaim:electron-dists reports what it would share; --apply does it. Each worktree is converted behind a rename, so an interrupted run leaves a working dist either way, and any worktree that fails is left untouched. Measured on one machine: 677 worktrees, ~195 GiB reclaimable. * fix(dev): keep the reclaim script's error formatting type-safe	2026-08-31 20:35:54 -07:00