fix(server): runtime prune no longer keeps a version whose directory is on the service PATH#25870

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fix/issue-25399

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Problem

On macOS the launch agent's PATH includes the running runtime's directory, ~/.t3/runtime/versions/<v>. The startup prune's shellLauncherTargets looks for t3 in every PATH directory, so it finds that runtime's own entry binary versions/<v>/t3. It then appends the entry to the append-only runtime/launchers, and every later prune treats <v> as referenced. Every version that reaches the service PATH is kept for good, about 270 MB each.

Reproduced on Linux with the real prunePinnedRuntimes (real filesystem and /proc scan) against a synthetic T3 home. Two service startups, on 0.1.0 and then 0.1.2, each with their own version directory on PATH. On main, runtime/launchers gains versions/0.1.0/t3 and versions/0.1.2/t3, and 0.1.0 survives the prune after the update.

Change

shellLauncherTargets now skips a candidate written as versions/<v>/t3 that is not itself a link. That is a runtime's own entry binary, which the macOS service's PATH exposes. A launcher still pins the runtime it reaches: a link from elsewhere (~/.local/bin/t3, or a custom bin directory even under versions/), or a PATH directory that is itself linked to a version directory. The same check applies to entries already in runtime/launchers, so installs pinned by an earlier prune are released on the next prune without rewriting the file.

That accidental record was also what kept a stopped macOS service's launcher runtime. The plist starts versions/<launcher>/t3, and in-place updates only move the active version. So the start-up prune (pruneRuntimesOnStart) now reads the installed unit or plist and passes its program, as written and resolved (for a symlinked T3 home), as a reference, as t3 update already does. bootServiceUnitPath exposes the unit location the service managers already use.

Scope and approval

Fixes pingdotgg/t3code#25398

Triaged via the automated issue flow; GitCafe issue #25399.

Verification

vp test run src/cloud/pinnedRuntime.test.ts (apps/server): 18 passed. The new removes a runtime only its own entry names when … cases (directory on PATH; entry already recorded by an earlier prune; real directory of a symlinked home on PATH) fail on main with expected [] to deeply equal [ '1.0.0' ] and pass with the change. keeps a runtime … names guards a custom bin directory under versions/ and a PATH directory linked to a version directory.
vp test run src/cloud/selfUpdate.test.ts: new keeps the runtime a stopped service's launch agent starts (as written, and through a symlinked T3 home). Without the start-up change both fail with expected [ '0.0.1' ] to deeply equal []. selfUpdate, pinnedRuntime, bootService and cli/update tests: 69 passed.
vp run check:changed: format, lint, knip, typecheck and tests pass.

Runtime transcript (Linux, real filesystem and /proc, synthetic home), main f3b058cd6a (prune code unchanged on current main 28286d523f) vs this branch:

	after the update's startup prune: `versions/`	`runtime/launchers`
Before (main `f3b058cd6a`)	`0.1.0, 0.1.2` (removed nothing)	`bin/t3`, `versions/0.1.0/t3`, `versions/0.1.2/t3`
After (this branch `99da2d3315`)	`0.1.2` (removed `0.1.0`)	`bin/t3`

Full transcript: transcript-25398.txt, driver: prune-driver.ts (not committed).

Server-only fix with no visible surface, so there are no captures.
cannot-verify macos: not run under a real launchd LaunchAgent. The mechanism is platform-independent, and the tests run it with platform: "darwin" and the lsof process list.

Model and harness: Claude Opus 5.5 (Claude Code, in T3 Code), reviewed by GPT-6.1 Sol (Codex) and Claude Opus 5.5.

🤖 Generated with Claude Code

Checks

23 successful · 10 skipped

All checks passed

Added 7 commits8d ago

fix(server): prune skips only a runtime's own entry, not launchers under versions/11b545c
fix(server): runtime prune no longer keeps a version whose directory is on PATH37dc44d
Merge remote-tracking branch 'origin/main' into fix/issue-2539951d6213
fix(server): start-up prune keeps the runtime a stopped service's unit starts6dc2993
test(server): prune removes a runtime only its own entry names (red)810bdee
Merge remote-tracking branch 'origin/main' into fix/issue-25399d0e0854
fix(server): start-up prune matches a service unit that names the runtime through a linked homed607be3

MmacroscopeappBotapproved these changes · review dismissed8d ago

MmacroscopeappBot8d ago

Approvability

Verdict: Approved at 99da2d3

Macroscope's review found this PR approvable — This is a focused server-side bug fix that corrects runtime pruning while preserving genuine launcher and boot-service references. The changed production paths are small and accompanied by regression tests, including the PATH-directory symlink case.

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Ggithub-actionsBot8d ago

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	5.0 KiB	5.0 KiB	+6 B (+0.1%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.3 KiB	+6 B (+0.5%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	21.6 KiB	21.6 KiB	0 B (0.0%)	24.4 KiB	✅
Codex	Live turn messages	2	2	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.1 KiB	+6 B (+0.1%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.3 KiB	1.3 KiB	+6 B (+0.5%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.9 KiB	21.9 KiB	0 B (0.0%)	24.4 KiB	✅
Claude	Live turn messages	2	2	0 (0.0%)	8	✅

Baseline: 28286d5 · PR result: 99da2d3 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 108.5 KiB
Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

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Reviewing files that changed from the base of the PR and between 51d6213c752108d95af8cc0652f01c9abada297c and 99da2d3315712a84955417d4c63005d6fe09898b.

External image Files selected for processing: 2

apps/server/src/cloud/pinnedRuntime.test.ts
apps/server/src/cloud/pinnedRuntime.ts

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apps/server/src/cloud/pinnedRuntime.ts
apps/server/src/cloud/pinnedRuntime.test.ts

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Walkthrough

The PR adds shared boot-service unit path lookup and includes service program paths in runtime-pruning references. It also changes how pruning handles launcher targets that resolve to runtime entry files inside versions directories.

Changes: Runtime pruning and service references

Layer / File(s)	Summary
Resolve boot-service unit paths `apps/server/src/cloud/bootService.ts`	Shared helpers build systemd and launchd unit paths. The exported helper returns no path for an empty home directory or an unsupported platform.
Preserve boot-service runtime references `apps/server/src/cloud/selfUpdate.ts`, `apps/server/src/cloud/selfUpdate.test.ts`	Startup pruning passes the boot-service program path and its resolved path as runtime references when available. Tests cover launch agents that start a stale runtime, directly or through a symlinked home.
Filter self-referential launcher targets `apps/server/src/cloud/pinnedRuntime.ts`, `apps/server/src/cloud/pinnedRuntime.test.ts`	On non-Windows platforms, pruning skips launcher targets inside a versions directory when the launcher resolves to its own runtime entry. Tests cover PATH entries, recorded launchers, and symlinked homes.

Priority: External image Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Low

Possibly related PRs

pingdotgg/t3code#23935: Changes the launch-agent program path, which this PR reads as a runtime-pruning reference.
pingdotgg/t3code#24289: Changes how launcher references are recorded for runtime pruning.
pingdotgg/t3code#25727: Updates managed launchers during self-update and changes old-runtime pruning.

Suggested reviewers: t3dotgg

Merge Risk: External image Minimal · up to 99da2

No actionable issue remains in the reviewed runtime-pruning changes; they are mergeable after normal checks.

Pre-merge checks: ^Passed 3 · ^Failed 1

^Failed Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Linked Issues check	Warning	Issue `#25398` requires the prune to retain a runtime when a real `t3` launcher points to it. In `shellLauncherTargets`, the updated `inVersionsDir(target)` check also matches a launcher reached through…	Change the own-entry check to distinguish a direct runtime entry from a path reached through a symlinked directory. Keep the latter as a launcher reference. Add or correct a regression test that uses a symlinked `PATH` directory and verifie…

^Passed Passed checks: 3 passed

Check name	Status	Explanation
Title check	Passed	The title clearly summarizes the main change: runtime pruning no longer keeps a version because its directory is on the service PATH.
Description check	Passed	The description includes the required Problem, Change, Scope and approval, and Verification sections. It explains the issue, fix, linked issue, test results, and the macOS validation limitation.
Out of Scope Changes check	Passed	The pruning changes, service-unit path helper, and tests all support issue `#25398`. The changes do not show unrelated product behavior.

Full details: Linked Issues check

Explanation

Issue #25398 requires the prune to retain a runtime when a real t3 launcher points to it. In shellLauncherTargets, the updated inVersionsDir(target) check also matches a launcher reached through a symlinked PATH directory. The code resolves the launcher's parent, appends t3, and skips the target when that path equals the resolved runtime entry. Thus a PATH directory linked to versions/<v> is treated as the runtime's own entry, although the PR description says this launcher must pin the runtime. The startup service-program reference addresses stopped services, but it does not correct this launcher classification.

Resolution

Change the own-entry check to distinguish a direct runtime entry from a path reached through a symlinked directory. Keep the latter as a launcher reference. Add or correct a regression test that uses a symlinked PATH directory and verifies that its runtime remains pinned.

Finishing Touches

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CcoderabbitaiBotreviewed · 1 inline thread8d ago

Actionable comments posted: 1

🪄 Fix comments: Fix CodeRabbit comments on this PR

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6	Inline comments:
7	Review comments at @apps/server/src/cloud/pinnedRuntime.ts:
8	- Line 437: Update the pruning logic around `if (unlinked === target)` so it
9	identifies entries inside a version directory by their path relative to the
10	versions root, rather than classifying them solely by their resolved parent.
11	Preserve PATH directory-symlink launchers as references, and add a focused test
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Repository: pingdotgg/t3code
Branch: fix/issue-25399
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Reviewing files that changed from the base of the PR and between 28286d523fc34582cbe2b5fd0bcf2947a97ed89f and 51d6213c752108d95af8cc0652f01c9abada297c.

External image Files selected for processing: 5

apps/server/src/cloud/bootService.ts
apps/server/src/cloud/pinnedRuntime.test.ts
apps/server/src/cloud/pinnedRuntime.ts
apps/server/src/cloud/selfUpdate.test.ts
apps/server/src/cloud/selfUpdate.ts

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apps/server/src/cloud/pinnedRuntime.tsline 437Outdated · 51d6213Resolved by Julius Marminge

Added 1 commit8d ago

fix(server): a PATH directory linked to a version still pins it99da2d3

MmacroscopeappBotapproved these changes8d ago

CcoderabbitaiBotreviewed11h ago