Record dest on occupy and retract it when confirmation, verify, or
staging cleanup fails. Restore unmatched quarantine with a no-replace
publish. Event/devapp copy uses mkdir-claim; shell rollback claims dest
before delete. Release copy now says npm/PowerShell create junctions and
Go uses os.Symlink, with copy fallback when linking is unavailable.
The POSIX shell installers staged shared Skill links and published them
with mv after an existence check; a file or symlink another process
created at the destination between the check and the move was silently
replaced, and the inode confirmation could not detect the loss. Publish
by creating each link directly at its destination instead — symlink(2)
refuses an occupied path with EEXIST, so the creation itself is the
atomic no-replace check. A directory that appears at the destination
turns ln -s into a container; the nested link is removed after an
identity check and the transaction rolls back, leaving the foreign
directory untouched. Applied to install.sh, install-skills.sh,
install-event.sh, and install-devapp.sh. Also covers the remaining
retraction branches of the Go shell-removal fallback so changed-code
coverage is complete. Regression tests inject a concurrent occupant at
the publish instant for regular-file and directory cases and assert the
foreign object and its contents stay completely unchanged.
The four standalone installers pruned the oldest excess stamp
directories regardless of origin, so a migration retiring more than
five batches destroyed its own rollback material mid-run — the same
data loss already fixed for Go via the run-root registry and present
in install.js/install.ps1 as currentRunBackupRoots. Every installer now
records the stamp directories it creates and pruning only removes
earlier-run batches, which is what the changelog already promises.
Restrict backup pruning to directories whose names match the DWS stamp
format (YYYYmmdd-HHMMSS with optional -N suffix) across all 8 installer
surfaces (Go, npm, 4 shell, 2 PowerShell). Unknown directories in
~/.dws/skill-backups are now preserved. Also fixes Windows coverage test
portability and covers the remaining macOS changed-code gap (retire
warning loop in runUpgrade).
A universal Agent whose obsolete private copy cannot be retired installs
nothing there, yet every entry point counted that retirement failure as an
install failure — aborting `npm install`, `dws skill setup`, and the shell
installers even when the canonical store and all links published correctly,
and skipping the skills-state write. Route retirement failures to a separate
warning path across all surfaces (Go upgrade + skill setup, npm, PowerShell,
install.sh, install-skills.sh, install-event.sh, install-devapp.sh).
Also:
- Add a checked-rename fallback for filesystems that reject the atomic
no-replace flag (NFS, FUSE, overlayfs); the no-clobber contract is kept and
the previously unsupported platforms build and work.
- PowerShell multi-mode links only bundle skills, never the shared canonical
store, so third-party/user skills are no longer fanned into every Agent root.
- Prune ~/.dws/skill-backups to the newest 5 on every surface; encode
HOME-relative backup names on PowerShell to preserve origin.
- Add simulated-win32 junction coverage and rewrite the tautological
no-replace test; remove dead code whose tests gave false coverage.
- Soften the overstated Windows ownership-proof comment (NTFS tunneling).
- install.ps1: remove published junctions lexically in Restore-MultiSkillSet
(Windows PowerShell 5.1 follows reparse points during Remove-Item -Recurse
and could delete canonical store contents); clean link staging dirs
lexically in Publish-CanonicalSkillLinks and Move-SkillPathRecoverably
- install.ps1: Test-SamePhysicalSkillRoot now dereferences junctions via
Get-PhysicalSkillPath (mirrors EvalSymlinks/realpathSync/cd -P), so reruns
recognize already-published junctions instead of backup churn
- install-event.sh: replace silent 'mv ... 2>/dev/null || true' rollback with
the loud backup-retained failure contract already enforced for devapp
- event/devapp sh+ps1: link→copy fallback and per-agent failures now degrade
per agent like install.sh (skip loudly, continue, report at the end)
instead of aborting mid-loop or swallowing errors
- tests: junction-lexical removal contract, event per-agent degrade
integration test, pwsh junction physical-root recognition + rerun
idempotency (no backup churn)
Point coverage, installers, IM skill-chain, and shared routing at
dingtalk-misc references after retiring the standalone event package.
Co-authored-by: Cursor <cursoragent@cursor.com>
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