diff --git a/.github/workflows/ssh-relay-runtime-artifacts.yml b/.github/workflows/ssh-relay-runtime-artifacts.yml
index d3d4ec16ec2..e2258a3a36b 100644
--- a/.github/workflows/ssh-relay-runtime-artifacts.yml
+++ b/.github/workflows/ssh-relay-runtime-artifacts.yml
@@ -264,6 +264,7 @@ jobs:
src/main/ssh/ssh-relay-artifact-selector.test.ts \
src/main/ssh/ssh-relay-libc-detection.test.ts \
src/main/ssh/ssh-relay-linux-kernel-detection.test.ts \
+ src/main/ssh/ssh-relay-darwin-version-detection.test.ts \
src/main/ssh/ssh-relay-artifact-download.test.ts \
src/main/ssh/ssh-relay-artifact-extraction.test.ts \
src/main/ssh/ssh-relay-artifact-cache-lock-release.test.ts \
@@ -811,6 +812,7 @@ jobs:
src/main/ssh/ssh-relay-artifact-selector.test.ts `
src/main/ssh/ssh-relay-libc-detection.test.ts `
src/main/ssh/ssh-relay-linux-kernel-detection.test.ts `
+ src/main/ssh/ssh-relay-darwin-version-detection.test.ts `
src/main/ssh/ssh-relay-artifact-download.test.ts `
src/main/ssh/ssh-relay-artifact-extraction.test.ts `
src/main/ssh/ssh-relay-artifact-cache-lock-release.test.ts `
diff --git a/config/scripts/ssh-relay-runtime-workflow.test.mjs b/config/scripts/ssh-relay-runtime-workflow.test.mjs
index 3ada4e78f36..4b8aa436ba8 100644
--- a/config/scripts/ssh-relay-runtime-workflow.test.mjs
+++ b/config/scripts/ssh-relay-runtime-workflow.test.mjs
@@ -122,6 +122,7 @@ describe('SSH relay runtime artifact workflow', () => {
'ssh-relay-artifact-selector.test.ts',
'ssh-relay-libc-detection.test.ts',
'ssh-relay-linux-kernel-detection.test.ts',
+ 'ssh-relay-darwin-version-detection.test.ts',
'ssh-relay-artifact-download.test.ts',
'ssh-relay-artifact-extraction.test.ts',
'ssh-relay-artifact-cache-lock-release.test.ts',
diff --git a/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist-summary.md b/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist-summary.md
index e94125a6556..0eb79abaed2 100644
--- a/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist-summary.md
+++ b/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist-summary.md
@@ -9,9 +9,9 @@ keeps commands, hashes, runner identities, timings, and failure details.
A checked box means the work has evidence in the detailed ledger. Design approval alone does not
complete a box.
-Active checkpoint: **Milestone 5 / Work Package 4 desktop resolver/cache — audit the next smallest
-remaining disconnected host-evidence boundary after exact-head acceptance of Linux kernel
-detection, 2026-07-15, Codex implementation owner.**
+Active checkpoint: **Milestone 5 / Work Package 4 desktop resolver/cache — exact-head native CI for
+the locally green disconnected marked macOS product-version probe, 2026-07-15, Codex implementation
+owner.**
`E-M5-ARTIFACT-CACHE-RESOLUTION-CI-001` closes warm-cache commit
`22031fa68` on all six native clients, both Linux supplements, Windows x64 baseline, PR Checks,
Golden E2E, and computer-use; Windows arm64 remains the expected build-26200 rejection against 26100. `E-M5-ARTIFACT-CACHE-RESOLUTION-LOCAL-001` passes 9/9 purpose tests,
@@ -151,6 +151,25 @@ Node/PTY/watcher smoke, then retains only the declared hosted build-26200 reject
26100; this is the aggregate workflow's sole failure. Real SSH/distro behavior, remaining host
evidence, composition, and every production/default path remain open; legacy remains the sole
production path.
+`E-M5-DARWIN-VERSION-DETECTION-AUDIT-001` fixes the next smallest package: one disconnected,
+15-second cancellable POSIX-shell/no-Node marked `sw_vers -productVersion` probe. Only one complete
+strict two-to-four-component numeric version counts; missing, noisy, incomplete, duplicate,
+malformed, suffixed, or oversized evidence returns unknown and cancellation propagates. The
+reviewed macOS 13.5 floor and selector grammar stay unchanged. Rosetta/process translation, Linux
+libstdc++/GLIBCXX, Windows evidence, full host composition, product callers, live SSH, transfer/
+install, settings, fallback, tuple enablement, publication, and defaults remain absent.
+`E-M5-DARWIN-VERSION-DETECTION-LOCAL-RED-001` records the expected missing-module failure before
+implementation: the purpose suite has one failed file and zero collected tests because the audited
+detection module does not exist. The native-workflow oracle now also requires that purpose suite
+exactly once in both POSIX and PowerShell runner commands and remains red until they are wired.
+Protected resolver files have zero diff; no production caller or default behavior is connected.
+`E-M5-DARWIN-VERSION-DETECTION-LOCAL-001` is green: 21/21 purpose tests, 62/62 focused+workflow
+tests, 415/415 non-full-size relay tests with three declared skips, 280/280 release-script tests,
+typecheck, lint, format, max-lines, diff, and protected-resolver gates pass. One 15-second
+cancellable marked POSIX command returns only a unique bounded numeric `sw_vers -productVersion`;
+malformed, noisy, duplicate, unavailable, or oversized evidence returns unknown and cancellation
+propagates. Both native runner families require the suite. Exact Node 24/all-six native proof is
+next; real SSH/macOS, Rosetta, composition, and all production/default behavior remain absent.
`E-M5-ARTIFACT-CACHE-ROOT-CI-001` closes the pure cache-root contract at exact head `aefcaa9a9`:
all six primary native Node 24 jobs, both Linux supplements, Windows x64 baseline, PR Checks, Golden
E2E, and computer-use pass; Windows arm64 build 26200 remains correctly gated against 26100. The
diff --git a/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist.md b/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist.md
index ecc0061b391..cd65688bf4c 100644
--- a/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist.md
+++ b/docs/reference/plans/2026-07-14-ssh-relay-github-release-implementation-checklist.md
@@ -8,8 +8,8 @@ work; keep exact commands, runner identities, hashes, metrics, and residual gaps
Date created: 2026-07-14
Last updated: 2026-07-15
-Current phase: Milestone 5 / Work Package 4 desktop resolver/cache — **In progress — 2026-07-15, Codex implementation owner: audit the next smallest remaining disconnected host-evidence boundary after exact-head acceptance of Linux kernel detection**. Keep every capability disconnected from host-evidence composition and every production/default SSH path. Real Apple/SignPath rehearsals remain an explicit late gate and are not on this package's critical path.
-Session checkpoint: **CI CLOSED / NEXT AUDIT — 2026-07-15, Codex implementation owner** — `E-M5-LINUX-KERNEL-DETECTION-CI-001` closes implementation commit `d1eb0eb63`: all six primary native Node 24 jobs, both Linux supplements, Windows x64 baseline, PR Checks, Golden E2E, and computer-use pass. Windows arm64 executes the full runtime smoke and retains only the declared hosted build-26200 rejection against required 26100. Every native client runs the new 19-case kernel contract and strict selector cases. This remains contract evidence, not live SSH/distro evidence; no host-evidence composer, product caller, setting, transfer/install, fallback classifier, tuple enablement, release publication, or default behavior is connected. Merging to `main` remains prohibited, SignPath is deferred, and legacy remains the production default.
+Current phase: Milestone 5 / Work Package 4 desktop resolver/cache — **In progress — 2026-07-15, Codex implementation owner: implement the disconnected marked macOS product-version probe fixed by E-M5-DARWIN-VERSION-DETECTION-AUDIT-001**. Keep every capability disconnected from host-evidence composition and every production/default SSH path. Real Apple/SignPath rehearsals remain an explicit late gate and are not on this package's critical path.
+Session checkpoint: **LOCAL GREEN / EXACT-HEAD CI NEXT — 2026-07-15, Codex implementation owner** — `E-M5-DARWIN-VERSION-DETECTION-LOCAL-001` passes the 21-case purpose contract, 62 focused/workflow tests, 415 relay tests with three declared skips, 280 release-script tests, typecheck, lint, format, max-lines, diff, and protected-resolver gates. Both native workflow families require the suite, but exact Node 24/all-six native execution remains open until the implementation commit is pushed. Rosetta/process-translation detection remains a separate uncomposed gate. No host-evidence composer, product caller, setting, transfer/install, fallback classifier, tuple enablement, release publication, or default behavior is connected. Merging to `main` remains prohibited, SignPath is deferred, and legacy remains the production default.
Primary design: [SSH relay GitHub Release plan](./2026-07-14-ssh-relay-github-release-plan.html)
Motivating issues: [#8450](https://github.com/stablyai/orca/issues/8450), [#1693](https://github.com/stablyai/orca/issues/1693)
@@ -15227,6 +15227,98 @@ config/scripts/ssh-relay-runtime-*.test.mjs` — PASS, 50 files / 280 tests in 1
composition, Electron/startup, transfer/install, settings, fallback, tuple enablement,
publication, or defaults. Legacy remains the sole production path; no tuple is enabled.
+### E-M5-DARWIN-VERSION-DETECTION-AUDIT-001 — disconnected marked macOS version boundary
+
+- Date/owner: 2026-07-15, Codex implementation owner.
+- Audit: complete rereads of current OS/architecture detection, the accepted marked libc and Linux
+ kernel probes, the signed-manifest selector/version grammar, baseline build evidence, and their
+ purpose tests. Desktop SSH code has no `sw_vers` caller; only target-native release baseline CI
+ reads macOS product version. The selector accepts explicit `SshRelayDarwinHostEvidence.version`
+ against the reviewed 13.5 floor, so the smallest missing acquisition boundary is one disconnected
+ product-version probe. Linux libstdc++/GLIBCXX evidence requires a separate external-tool and
+ ambiguity audit; Windows bootstrap evidence and Rosetta translation are also larger independent
+ slices.
+- Finding: add one purpose-named `ssh-relay-darwin-version-detection` module that consumes an
+ explicit SSH connection and optional cancellation signal, executes one 15-second POSIX-shell/
+ no-Node marked `sw_vers -productVersion`, and returns an exact bounded two-to-four-component
+ numeric version or undefined. Do not change the selector grammar or reviewed macOS 13.5 floor.
+- Safety contract: only one complete marker-qualified line counts; arbitrary or marker-concatenated
+ startup noise, empty/multi-line/duplicate/unterminated segments, whitespace/control characters,
+ suffixes, oversized values, missing commands, and malformed versions yield unknown. Ordinary
+ execution failure is availability evidence; `AbortError` propagates. The probe uses no Node, npm,
+ Python, Perl, archive, checksum, or localization-sensitive parsing.
+- Required RED: missing purpose module, then exact 13.5/10.15.7/15.x versions, startup noise,
+ concatenated/duplicate/unterminated/multi-line/oversized/malformed rejection, unavailable command,
+ cancellation, exact signal/15-second exec, no-Node command construction, and both native-workflow
+ families requiring the suite.
+- Deliberately absent: Rosetta/process-translation detection, Linux libstdc++/GLIBCXX, Windows
+ OpenSSH/PowerShell/.NET/build evidence, host-evidence composition, Electron/startup/product
+ callers, live SSH/macOS cells, cache acquisition, transfer/install, settings, fallback, tuple
+ enablement, release publication, and defaults. Legacy remains the sole production path and the
+ primary HTML plan is unchanged.
+
+### E-M5-DARWIN-VERSION-DETECTION-LOCAL-RED-001 — macOS version probe fails first
+
+- Date/owner: 2026-07-15, Codex implementation owner.
+- Source: uncommitted RED test atop exact accepted evidence head `e6383cbcd`; protected resolver
+ files have zero diff and `git diff --check` passes.
+- Command: `pnpm vitest run src/main/ssh/ssh-relay-darwin-version-detection.test.ts`.
+- Expected result: FAIL, 1 failed suite / zero collected tests because
+ `ssh-relay-darwin-version-detection` does not exist. Duration: 288 ms Vitest. The repository's
+ expected Node-24 engine warning is present under local Node 26.0.0 / pnpm 10.24.0.
+- Native-workflow RED command: `pnpm vitest run
+config/scripts/ssh-relay-runtime-workflow.test.mjs` — expected FAIL, 1 file / 6 passed / 1 failed
+ in 268 ms. The workflow oracle requires `ssh-relay-darwin-version-detection.test.ts` exactly once
+ in each POSIX and PowerShell native command family; the source split has length 1 rather than the
+ required 3 until both commands are wired.
+- Boundary: this is failure-before-implementation evidence only. It authorizes only the audited
+ disconnected probe, purpose tests, and native-workflow inclusion; no production caller or
+ behavior is connected.
+
+### E-M5-DARWIN-VERSION-DETECTION-LOCAL-001 — disconnected marked macOS version probe
+
+- Date/owner: 2026-07-15, Codex implementation owner.
+- Implementation: `ssh-relay-darwin-version-detection.ts` executes one 15-second cancellable
+ POSIX-shell command, guards `sw_vers -productVersion`, and brackets its result with exact Orca
+ markers. It returns only one complete unique two-to-four-component numeric version of at most 64
+ characters. Startup noise outside markers is ignored; empty, multi-line, duplicate,
+ unterminated, marker-concatenated, suffixed, whitespace/control, slash, colon, oversized, or
+ malformed evidence returns undefined. Ordinary execution failure returns undefined and
+ `AbortError` propagates. The command has no Node, npm, Python, Perl, tar, or checksum dependency.
+- Purpose command: `/usr/bin/time -l pnpm exec vitest run --config config/vitest.config.ts
+--maxWorkers=1 src/main/ssh/ssh-relay-darwin-version-detection.test.ts` — PASS, 1 file / 21 tests
+ in 265 ms Vitest, 1.35 s wall, 132,022,272-byte maximum RSS, zero swaps. Valid 13.5, 10.15.7,
+ 15.4.1, and 15.4.1.2 values; noisy/missing/malformed/bounded evidence; unavailable command;
+ cancellation; exact signal/15-second exec; guarded marked command; and forbidden-runtime absence
+ all pass.
+- Focused plus native-workflow oracle: `/usr/bin/time -l pnpm exec vitest run --config
+config/vitest.config.ts --maxWorkers=1
+src/main/ssh/ssh-relay-darwin-version-detection.test.ts
+src/main/ssh/ssh-relay-artifact-selector.test.ts
+src/main/ssh/ssh-remote-platform-detection.test.ts
+config/scripts/ssh-relay-runtime-workflow.test.mjs` — PASS, 4 files / 62 tests in 1.67 s Vitest,
+ 2.86 s wall, 137,003,008-byte maximum RSS, zero swaps. Both POSIX and PowerShell native commands
+ require the purpose suite exactly once; existing platform and reviewed selector behavior passes.
+- Broader relay command: `/usr/bin/time -l pnpm exec vitest run --config config/vitest.config.ts
+--maxWorkers=1 --silent=true src/main/ssh/ssh-relay-*.test.ts` — PASS, 35 files passed / 3 declared
+ skipped, 415 tests passed / 3 declared skipped in 20.76 s Vitest, 23.12 s wall, 259,325,952-byte
+ maximum RSS, zero swaps. The expected stale-lock diagnostic and Node 26 `module.register()`
+ deprecation warning are unchanged.
+- Release-script command: `/usr/bin/time -l pnpm exec vitest run --config
+config/vitest.config.ts --maxWorkers=1 --silent=true
+config/scripts/ssh-relay-runtime-*.test.mjs` — PASS, 50 files / 280 tests in 19.48 s Vitest,
+ 21.47 s wall, 189,300,736-byte maximum RSS, zero swaps.
+- Static gates: `pnpm typecheck`; targeted `pnpm exec oxlint`; targeted `pnpm exec oxfmt --check`;
+ `pnpm lint`; `pnpm run check:max-lines-ratchet`; and `git diff --check` pass after formatting the
+ two reported files. Full lint includes switch exhaustiveness, 41 reliability gates, 355
+ grandfathered max-lines entries with no new bypass, bundled-skill verification, 9,837
+ localization references and locale parity, and zero localization coverage candidates. Its 26
+ warnings are in untouched files. Protected resolver files have zero diff.
+- Residual gap: local execution uses Node 26.0.0 / pnpm 10.24.0; exact Node 24 on all six native
+ client runners, both Linux supplements, and Windows baselines remains required at the exact
+ implementation head. No real SSH/macOS host, Rosetta, full host composition, product caller,
+ transfer/install, setting, fallback, tuple, publication, or default behavior is proven or added.
+
## Accepted Gaps
No product gap is accepted merely because it appears in this list. Each entry requires explicit
@@ -15285,10 +15377,12 @@ The project is not complete until every applicable item below is checked with ev
## Next Required Action
-Audit the next smallest disconnected host-evidence slice after exact-head acceptance of Linux
-kernel detection. Do not compose full host evidence, provision production secrets/environments, add
-an Electron/startup consumer, embed unreviewed keys or manifest bytes, add SSH transfer/install,
-mode wiring, fallback, tuple enablement, release publication, or default behavior.
+Commit the locally proven disconnected marked macOS product-version package, push it to the draft
+PR, and require exact-head all-six native artifact CI before advancing. Do not compose full host
+evidence, add
+Rosetta detection, provision production secrets/environments, add an Electron/startup consumer,
+embed unreviewed keys or manifest bytes, add SSH transfer/install, mode wiring, fallback, tuple
+enablement, release publication, or default behavior.
Keep Node upstream `.tar.xz` inputs, Windows ZIP, `ORCA_RELAY_PATH`, existing desktop required-assets
behavior, detached-signature byte encoding, Windows arm64 build 26100, macOS 13.5, Linux kernel 4.18,
release-cut, desktop builds, publication, and every tuple separately gated.
diff --git a/src/main/ssh/ssh-relay-darwin-version-detection.test.ts b/src/main/ssh/ssh-relay-darwin-version-detection.test.ts
new file mode 100644
index 00000000000..9032810c104
--- /dev/null
+++ b/src/main/ssh/ssh-relay-darwin-version-detection.test.ts
@@ -0,0 +1,88 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { SshConnection } from './ssh-connection'
+
+const execCommandMock = vi.hoisted(() => vi.fn())
+
+vi.mock('./ssh-relay-deploy-helpers', () => ({
+ execCommand: execCommandMock
+}))
+
+const { detectSshRelayDarwinVersion } = await import('./ssh-relay-darwin-version-detection')
+
+const conn = {} as SshConnection
+const marker = '__ORCA_SSH_RELAY_DARWIN_VERSION__'
+
+function segment(...lines: string[]): string {
+ return [`${marker} BEGIN`, ...lines, `${marker} END`].join('\n')
+}
+
+describe('detectSshRelayDarwinVersion', () => {
+ beforeEach(() => {
+ execCommandMock.mockReset()
+ })
+
+ it.each(['13.5', '10.15.7', '15.4.1', '15.4.1.2'])(
+ 'returns the exact marked macOS product version %s',
+ async (version) => {
+ execCommandMock.mockResolvedValueOnce(
+ ['Last login: ignored', segment(version), 'post-command noise'].join('\n')
+ )
+
+ await expect(detectSshRelayDarwinVersion(conn)).resolves.toBe(version)
+ }
+ )
+
+ it.each([
+ ['', 'empty segment'],
+ ['15.4\nsecond-line', 'multiple marked lines'],
+ [`${marker} BEGIN\n15.4`, 'unterminated segment'],
+ [segment('1'.repeat(65)), 'oversized version'],
+ [segment('15'), 'missing minor component'],
+ [segment('15.4.1.2.3'), 'too many components'],
+ [segment('15.4-beta'), 'version suffix'],
+ [segment('15.4 beta'), 'version whitespace'],
+ [segment('15.4\u0000'), 'version control character'],
+ [segment('15.4/beta'), 'version slash'],
+ [segment('15.4:beta'), 'version colon'],
+ ['15.4', 'unmarked evidence'],
+ [[segment('15.4'), segment('15.4')].join('\n'), 'duplicate complete segments'],
+ [`startup${marker} BEGIN\n15.4\n${marker} END`, 'marker concatenated to startup noise']
+ ])('returns unknown for %s', async (output) => {
+ execCommandMock.mockResolvedValueOnce(output)
+
+ await expect(detectSshRelayDarwinVersion(conn)).resolves.toBeUndefined()
+ })
+
+ it('classifies an unavailable probe as unknown without inventing fallback policy', async () => {
+ execCommandMock.mockRejectedValueOnce(new Error('remote command unavailable'))
+
+ await expect(detectSshRelayDarwinVersion(conn)).resolves.toBeUndefined()
+ })
+
+ it('propagates cancellation and passes the signal into the single bounded probe', async () => {
+ const signal = new AbortController().signal
+ const abortError = Object.assign(new Error('cancelled'), { name: 'AbortError' })
+ execCommandMock.mockRejectedValueOnce(abortError)
+
+ await expect(detectSshRelayDarwinVersion(conn, { signal })).rejects.toBe(abortError)
+ expect(execCommandMock).toHaveBeenCalledTimes(1)
+ expect(execCommandMock).toHaveBeenCalledWith(conn, expect.any(String), {
+ signal,
+ timeoutMs: 15_000
+ })
+ })
+
+ it('constructs one marked POSIX-shell sw_vers probe without runtime dependencies', async () => {
+ execCommandMock.mockResolvedValueOnce(segment('15.4'))
+
+ await detectSshRelayDarwinVersion(conn)
+
+ const command = execCommandMock.mock.calls[0]?.[1] ?? ''
+ expect(command).toContain('command -v sw_vers')
+ expect(command).toContain('sw_vers -productVersion')
+ expect(command.match(/sw_vers -productVersion/gu)).toHaveLength(1)
+ expect(command).toContain(`${marker} BEGIN`)
+ expect(command).toContain(`${marker} END`)
+ expect(command).not.toMatch(/\b(?:node|npm|python|perl|tar|sha256sum|shasum)\b/u)
+ })
+})
diff --git a/src/main/ssh/ssh-relay-darwin-version-detection.ts b/src/main/ssh/ssh-relay-darwin-version-detection.ts
new file mode 100644
index 00000000000..92fdc52585f
--- /dev/null
+++ b/src/main/ssh/ssh-relay-darwin-version-detection.ts
@@ -0,0 +1,93 @@
+import {
+ getProcessOutputFields,
+ iterateProcessOutputLines
+} from '../../shared/process-output-field-scanner'
+import type { SshConnection } from './ssh-connection'
+import { execCommand } from './ssh-relay-deploy-helpers'
+
+const PROBE_MARKER = '__ORCA_SSH_RELAY_DARWIN_VERSION__'
+const PROBE_TIMEOUT_MS = 15_000
+const VERSION_MAX_CHARS = 64
+
+const PROBE_COMMAND = [
+ `printf '\n%s\n' '${PROBE_MARKER} BEGIN'`,
+ 'if command -v sw_vers >/dev/null 2>&1; then sw_vers -productVersion 2>&1 || :; fi',
+ `printf '%s\n' '${PROBE_MARKER} END'`
+].join('\n')
+
+function parseMarker(line: string): 'BEGIN' | 'END' | null {
+ const fields = getProcessOutputFields(line, 3)
+ if (fields.length !== 2 || fields[0] !== PROBE_MARKER) {
+ return null
+ }
+ return fields[1] === 'BEGIN' || fields[1] === 'END' ? fields[1] : null
+}
+
+function isDarwinProductVersion(value: string | undefined): value is string {
+ if (!value || value.length > VERSION_MAX_CHARS || !/^\d+(?:\.\d+){1,3}$/.test(value)) {
+ return false
+ }
+ return value.split('.').map(Number).every(Number.isSafeInteger)
+}
+
+function parseDarwinProductVersion(output: string): string | undefined {
+ let activeLines: string[] | null = null
+ let version: string | undefined
+ let invalid = false
+
+ for (const line of iterateProcessOutputLines(output)) {
+ const marker = parseMarker(line)
+ if (marker === 'BEGIN') {
+ if (activeLines || version !== undefined) {
+ invalid = true
+ }
+ activeLines = []
+ continue
+ }
+ if (marker === 'END') {
+ if (!activeLines || activeLines.length !== 1 || version !== undefined) {
+ invalid = true
+ activeLines = null
+ continue
+ }
+ version = activeLines[0]
+ activeLines = null
+ continue
+ }
+ if (activeLines) {
+ if (activeLines.length === 1) {
+ invalid = true
+ } else {
+ activeLines.push(line)
+ }
+ }
+ }
+
+ if (invalid || activeLines || !isDarwinProductVersion(version)) {
+ return undefined
+ }
+ return version
+}
+
+function isAbortError(error: unknown): boolean {
+ return error instanceof Error && error.name === 'AbortError'
+}
+
+export async function detectSshRelayDarwinVersion(
+ conn: SshConnection,
+ { signal }: { signal?: AbortSignal } = {}
+): Promise {
+ try {
+ const output = await execCommand(conn, PROBE_COMMAND, {
+ signal,
+ timeoutMs: PROBE_TIMEOUT_MS
+ })
+ return parseDarwinProductVersion(output)
+ } catch (error) {
+ // Why: cancellation must settle the caller's work instead of becoming compatibility evidence.
+ if (isAbortError(error)) {
+ throw error
+ }
+ return undefined
+ }
+}