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feat(psmux): adopt psmux 3.4.0 and retire its five workarounds - #900
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WalkthroughThe change raises the minimum supported psmux version to 3.4.0, adds psmux inherited-environment queries, and allows dash-leading option values. It also changes new control sessions to use a fixed name across bundled transports while retaining recognition of the legacy digest-suffixed name. Changespsmux backend and control-session updates
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant PsmuxMultiplexer
participant ShowEnvironmentHelper
participant psmux
PsmuxMultiplexer->>ShowEnvironmentHelper: Request inherited variable
ShowEnvironmentHelper->>psmux: Query session-scoped variable
psmux-->>ShowEnvironmentHelper: Return value or miss
ShowEnvironmentHelper->>psmux: Query global variable for the session after a miss
psmux-->>ShowEnvironmentHelper: Return global value or miss
ShowEnvironmentHelper-->>PsmuxMultiplexer: Return value, UNSET, or fault result
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Linked Issues check |  |
The PR implements the main requirements in #733. It restores bmad-loop-ctl, recognizes legacy digest-suffixed control sessions, keeps mint and parse predicates separate, preserves the reserved `--ru… |
Remove the absolute psmux pin from _parked_trailer now that the floor is 3.4.0. Update the stranded-session ceiling in docs/FEATURES.md to describe only the PATH case, and remove the obsolete reap limitation from that document. |
| Docstring Coverage | |
Docstring coverage is 55.88% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 12 files. (1 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Out of Scope Changes check The implementation, tests, CI pin, shared environment parser, psmux inherited_envsupport, and documentation changes support#879,#733, or#754. No unrelated change is demonstrated by the reviewed …Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely summarizes the main changes: adopting psmux 3.4.0 and retiring five related workarounds.
Full details: Linked Issues check
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Explanation
The PR implements the main requirements in
#733. It restoresbmad-loop-ctl, recognizes legacy digest-suffixed control sessions, keeps mint and parse predicates separate, preserves the reserved--run-idrefusal, and updates control-session documentation. It implements the psmux 3.4.0 floor and the adopted tests for#879. However,#879requires removal of the pinned psmux path after the supported floor reaches the release with the PATH fix.psmux_backend.pystill resolves an absolute psmux path for_parked_trailer. The PR also narrowslive_session_may_be_oursfor#754, but the revieweddocs/FEATURES.mdchange only updates the version text and does not narrow that document's stranded-session ceiling to the PATH case.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 55.88% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 12 files. (1 skipped: 1 unsupported.)
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A rabbit checked the server’s start-time trail,
Then found the pane’s inherited PATH without fail.
Dash-leading values hopped through the gate,
While fixed-name sessions gathered to wait.
Old suffixes stayed known in the registry’s light,
And psmux queries returned names right.
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Review comments at @src/bmad_loop/adapters/psmux_backend.py:
- Around line 1605-1614: Update the psmux version floor and version parsing used
by `available()` so the minimum supported version is stable 3.4.0. Preserve
prerelease information during parsing and reject any prerelease version,
including versions whose numeric components meet or exceed the floor.
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📒 Files selected for processing (20)
.github/workflows/ci.ymlCHANGELOG.mddocs/FEATURES.mddocs/multiplexer-backends.mddocs/reference/run-state.mddocs/setup-guide.mddocs/testing.mddocs/tui-guide.mdsrc/bmad_loop/adapters/multiplexer.pysrc/bmad_loop/adapters/psmux_backend.pysrc/bmad_loop/adapters/tmux_backend.pysrc/bmad_loop/adapters/tmux_base.pysrc/bmad_loop/runs.pysrc/bmad_loop/tui/app.pysrc/bmad_loop/tui/launch.pytests/test_multiplexer.pytests/test_psmux_backend.pytests/test_psmux_live.pytests/test_runs.pytests/test_tui_launch.py
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…efusal psmux 3.4.0 stores a `-`-leading option value verbatim (psmux/psmux#583), so `_LAST_UNSUPPORTED` moves to (3, 3, 8) and `_transportable` stops refusing an `@` option value that starts with `-`. On 3.3.8 and older the backend now reports unavailable, and selection falls through. The parked-window trailer keeps its pinned psmux path. 3.4.0 panes inherit the PATH of the process that started the server (psmux/psmux#773), but a long-lived control session can be served by a server that another launcher, or a pre-floor psmux, started, and there a bare name fails silently. The bmad-code-org#583 and bmad-code-org#773 live premise rows become ordinary-direction rows: a dash-leading value is stored, and a pane inherits the server's start PATH.
psmux 3.4.0 keys its single-server name mutex on the registry as well as the session name (psmux/psmux#599), so two per-project registries can each hold a session called bmad-loop-ctl. The per-registry digest suffix that worked around the collision retires: ctl_session_for answers bmad-loop-ctl on every transport. is_ctl_session_name still recognises a bmad-loop-ctl-<digest> session left running from before the upgrade, so prune, cleanup and the TUI keep treating it as a control session, but nothing launches into it. The reserved --run-id refusal is unchanged. The live premise row becomes the ordinary-direction row that two registries each hold a session of one name. Closes bmad-code-org#733
psmux 3.4.0 no longer reaps a live server's .port file when has-session's connect times out (psmux/psmux#622), so a listing that omits a live session now has one known cause: a process whose PATH lacks the multiplexer binary. The live_session_may_be_ours docstring and the recovery guide drop the reap half, and the live premise row becomes the ordinary-direction row that a live registry entry survives a slow connect. Closes bmad-code-org#754
…vironment psmux 3.4.0 answers `show-environment` for one named variable the way tmux does (psmux/psmux#775): named queries, `unknown variable`, `-NAME` removals and a real `-g` scope. The psmux backend now implements inherited_env on top of it, so the TUI's stale state-root note fires on Windows too. psmux runs one server per session, so the global query is session-targeted (`-g -t =<session>`), and the reply echoes the stored spelling of the name, so it is matched case-insensitively. The shared reply parser moves to tmux_base. The live premise row becomes the ordinary-direction row that a named, session-targeted global query answers for that one name.
The floor is 3.4.0 and the workarounds the 3.3.8 premise rows guarded are retired, so the blocking gate now tests the release bmad-loop requires.
Describe what bmad-loop does with a bmad-loop-ctl-<16 hex> session today (a control session, never pruned, never launched into) and how to end one, without the release chronology, which stays in the CHANGELOG.
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psmux 3.4.0 is released. It is the first release after 3.3.8, and it carries every upstream fix this backend has been working around: psmux/psmux#583, psmux/psmux#599, psmux/psmux#622, psmux/psmux#773, psmux/psmux#774 and psmux/psmux#775. This PR adopts it in one step. The step has to be atomic: once the gate's pin moves to
v3.4.0, eachtest_premise_*tripwire goes red by design until its workaround retires. So the floor, the pin, the five retirements and the five row conversions land together.Commits
_LAST_UNSUPPORTEDmoves to(3, 3, 8). On 3.3.8 and older the backend reports unavailable, and selection falls through._transportablestops refusing an@value that starts with-(set-option parses flags after the option name: a dash-leading value is eaten —-udeletes the key at rc 0, and there is no--end-of-options (3.3.8) psmux/psmux#583).bmad-loop-ctl(retire the per-registry control-session name once a psmux release carries the psmux#599 fix #733). the single-server name mutex ignores PSMUX_DATA_DIR, so two registries cannot both hold a session of the same name — including __warm__ (3.3.8/master) psmux/psmux#599 keys the server-name guard on the registry now. This is operator-visible:bmad-loop-ctl-<digest>session is still treated as a control session, so it is never pruned.bmad-loop-ctl.multiplexer-backends.mdsay how to retire the old session.has-sessionno longer reaps a live.portfile on a connect timeout.inherited_envon psmux (psmux 3.3.8 -> 3.3.9 adoption: umbrella for the floor bump, workaround retirement, and the follow-on tracks #660), through psmux 3.4.0's namedshow-environment(show-environment ignores NAME, omits inherited variables and prints removals as empty values (3.3.8, master) psmux/psmux#775). With it, the TUI's stale state-root note fires on Windows too.-g -t =<session>), because psmux runs one server per session.tmux_base.v3.4.0.Live gate
All five
test_premise_*rows that pinned 3.3.8 behaviour become ordinary-directiontest_adopted_*rows:--leading value is stored;PATH;show-environmentanswers for that one name.Each converted row was shown to fail against a fake of the 3.3.8 behaviour.
Verification (Windows 11, PowerShell 7.6, psmux 3.4.0
20aa1d7)tests/test_psmux_live.py, run serially from PowerShell: 28 passed.WinError 1314and 1 is acodex.CMDpath.Closes #879
Closes #733
Closes #754
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PATH.