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125a1cbe-35e3-4855-abd5-01d04edffa50["lore_tm_v1_nBEzokjevbVRAJsc5x9fgMD_lOEy-6BQS6BV24aLGMk","lore_tm_v1_r-QuwLfD3vSJWqrQP6HmMdn_smqEknOR36W1a7dTQdY","lore_tm_v1_CX_46qQHJUYqxr3ZkEB_2hx86lUMw3pG30HHH0U2WME","lore_tm_v1_8sHgyAFSuTNr0BfBRAXaZy3uNVsHHRfZ31m-MdbA_cc"]
Date: Sep 8, 2026
/home/byk/.local/share/opencode-v2-pilot/supervisor/internal/protocol/frame.go (225 lines), which defines Go-side OPTY frame parsing/writing plus Start payload encoding and decoding.frame.go protocol constants are HeaderSize = 12, MaxFrameSize = 70 * 1024, MaxIOPayloadSize = 32 * 1024, Version = 1, and frame types TypeStart = 1, TypeInput = 2, TypeOutput = 3, TypeExit = 4, TypeError = 5, TypeStarted = 6, TypeStop = 7, TypeStopped = 8; start limits are MaxArgs = 128, MaxCommandSize = 4096, MaxArgSize = 16384, MaxArgsSize = 65536, and MaxRuntimeSec = 3600 (frame.go:12-32).protocol.Frame contains Type byte and Payload []byte; protocol.Start contains Device uint64, Inode uint64, RuntimeSec uint32, Command string, and Args []string. Protocol errors are ErrInvalidFrame and ErrFrameTooLarge, and the magic is [4]byte{'O', 'P', 'T', 'Y'} (frame.go:34-51).ReadFrame() reads exactly the 12-byte header with io.ReadFull, validates it through parseHeader(), then reads the declared payload exactly; WriteFrame() rejects payloads larger than MaxFrameSize, emits magic/version/type and a big-endian uint32 payload length at bytes 8–11, then uses writeAll() for both header and payload (frame.go:53-82).EncodeStart() rejects an empty command, command over 4096 bytes, NUL-containing or invalid-UTF-8 command/arguments, more than 128 arguments, arguments over 16384 bytes, aggregate argument data over 65536 bytes, runtime over 3600 seconds, or final payload over MaxFrameSize. The payload layout is big-endian Device at bytes 0–7, Inode at 8–15, RuntimeSec at 16–19, uint16 command length at 20–21, uint16 argument count at 22–23, command bytes, then each argument as a uint16 length followed by bytes (frame.go:84-118).DecodeStart() requires at least 24 bytes and validates the same command, argument-count, per-argument, aggregate-argument, UTF-8, NUL, and runtime constraints. It requires every declared argument to be present and rejects any trailing bytes by requiring offset == len(payload) (frame.go:120-170).MarshalFrame() creates one contiguous HeaderSize + len(Payload) packet; ParsePacket() requires at least 12 bytes, validates the header, and requires packet length to equal exactly HeaderSize + declaredLength. parseHeader() requires magic OPTY, version 1, reserved bytes 6 and 7 equal to zero, length no greater than MaxFrameSize, and type in the inclusive range TypeStart through TypeStopped (frame.go:172-210).writeAll() repeatedly calls writer.Write() until all bytes are written, returning the writer error or io.ErrShortWrite if a write reports zero bytes without an error (frame.go:213-225)./home/byk/.local/share/opencode-v2-pilot/supervisor/internal/supervisor/auth.go (108 lines), which authenticates Unix-socket clients using SO_PEERCRED, SO_PEERPIDFD, systemd service identity, pidfd liveness, cgroup identity, and invocation continuity.authenticatedPeer retains credential *unix.Ucred, pidfd int, and the admitted clientIdentity. authenticate() obtains both peer credentials and pidfd, validates the expected UID/GID and positive PID, queries manager.ClientState(ctx), validates the service identity, stores that identity, and closes the pidfd on every failed validation path (auth.go:13-40,59-70).authenticatedPeer.validateIdentity() requires the socket peer PID to equal systemd MainPID, ActiveState == "active", SubState == "running", ControlGroup == expectedClientCgroup, and an InvocationID exactly 16 bytes long (auth.go:73-80).authenticatedPeer.Recheck() first probes peer-process liveness with unix.PidfdSendSignal(peer.pidfd, 0, nil, 0), then re-queries and validates the client service and requires its InvocationID to remain byte-for-byte equal to the identity captured during admission; a changed ID returns client service InvocationID changed during admission (auth.go:42-57).peerIdentity() accesses the Unix socket through SyscallConn().Control(), reads SO_PEERCRED and SO_PEERPIDFD, rejects a negative pidfd, and marks the pidfd close-on-exec via unix.CloseOnExec(pidfd). authenticatedPeer.Close() closes any nonnegative pidfd and sets it to -1 (auth.go:59-64,83-108)./home/byk/.local/share/opencode-v2-pilot/supervisor/internal/supervisor/systemd.go (535 lines), which manages authenticated client identity queries, transient PTY service creation, unit completion polling, verified stopping, systemd signal subscriptions, orphan cleanup, sandbox/resource properties, and result decoding.systemd.go constants are clientService = "opencode-v2.service", supervisorService = "opencode-pty-supervisor.service", ptySlice = "opencode-pty.slice", expectedClientCgroup = "/system.slice/opencode-v2.service", launcherPath = "/usr/local/libexec/opencode-pty-launcher", unitPrefix = "opencode-pty-", unitSuffix = ".service", operationTimeout = 5 * time.Second, stopTimeout = 15 * time.Second, outputDrainTimeout = 2 * time.Second, stateQueryInterval = 100 * time.Millisecond, defaultRuntimeSec = 3600, perSessionMemoryMax = 512 * 1024 * 1024, perSessionMemoryHigh = 384 * 1024 * 1024, and perSessionTasksMax = 64; valid names match ^opencode-pty-[0-9a-f]{32}\.service$ (systemd.go:18-36).unitManager defines ClientState(context.Context), Start(context.Context, string, protocolCommand, *os.File, *os.File, uint32), StopAndWait(context.Context, string), Wait(context.Context, string), CleanupOrphans(context.Context), and Close(). protocolCommand contains Command and Args; unitResult contains Result, ExecMainCode, and ExecMainStatus (systemd.go:38-64).NewSystemdManager() opens a system systemd D-Bus connection under a 5-second operation timeout. ClientState() reads unit and service properties; decodeClientIdentity() strictly types MainPID, ActiveState, SubState, and ControlGroup, requires a 16-byte InvocationID, and copies that ID into the returned identity (systemd.go:66-118).systemdManager.Start() invokes StartTransientUnitContext(..., name, "fail", unitProperties(...), result) under a 5-second timeout. waitForJobResult() accepts only the exact job result "done", rejects a closed result channel, and otherwise reports ${action} job result: ${jobResult} (systemd.go:120-143).systemdManager.Wait() polls every 100 ms and treats ActiveState == "failed", SubState == "exited", or ActiveState == "inactive" as terminal; it then reads service properties and decodes Result string, ExecMainCode int32, and ExecMainStatus int32 (systemd.go:145-171,512-525).StopAndWait() rejects invalid transient-unit names, then uses a 15-second timeout detached from caller cancellation via context.WithTimeout(context.WithoutCancel(ctx), stopTimeout). A unit is verified stopped only when it no longer exists or its ControlGroup == "" and ActiveState is "inactive" or "failed" (systemd.go:173-224).StopAndWait() subscribes before calling StopUnitContext(..., name, "replace", result), then combines systemd property/removal signals, stop-job results, and 100-ms state polling. "org.freedesktop.systemd1.NoSuchUnit" is treated as success; a non-"done" stop result is retained as an error even if stopped state is later verified (systemd.go:173-261,532-535).StopAndWait() performs one final state query under a fresh 5-second background context. It returns success only if stopped state is verified and there was no stop-result error; otherwise it distinguishes failure to verify unit removal from failure to obtain an empty unit cgroup and includes accumulated stop-result, signal, and final-query errors (systemd.go:262-295).subscribeUnitSignals() directly dials /run/dbus/system_bus_socket, creates a D-Bus connection with newBoundedSignalHandler(8), performs Auth() and Hello(), calls systemd Manager Subscribe, then installs matches for that unit’s org.freedesktop.DBus.Properties.PropertiesChanged and Manager UnitRemoved with argument 0 equal to the unit name (systemd.go:306-364).boundedSignalHandler uses an RW mutex and a bounded channel; DeliverSignal() performs a nonblocking send and drops signals when the channel is full, while Terminate() idempotently marks the handler closed and closes the channel (systemd.go:366-396).CleanupOrphans() lists units matching opencode-pty-*.service, skips names failing validUnitName(), and stops only units whose BindsTo property is exactly one-element []string{"opencode-pty-supervisor.service"}; any cleanup failure is wrapped as clean orphan ${unit.Name}: ... (systemd.go:398-422).unitProperties() encodes the command and each argument as "a" + base64.RawURLEncoding.EncodeToString(...), prepends /usr/local/libexec/opencode-pty-launcher, and substitutes defaultRuntimeSec = 3600 when requested runtime is 0 (systemd.go:441-451).OpenCode PTY ${name}, type "exec", slice opencode-pty.slice, BindsTo/After opencode-pty-supervisor.service, User = "byk", Group = "byk", no supplementary groups, NoNewPrivileges = true, zero capability bounding/ambient sets, UMask = 0077, KillMode = "control-group", KillSignal = 15, FinalKillSignal = 9, SendSIGKILL = true, TimeoutStopUSec = 15 seconds, OOMPolicy = "kill", Delegate = false, RemainAfterExit = true, and CollectMode = "inactive" (systemd.go:452-474).StandardInputFileDescriptor and StandardOutputFileDescriptor to stream.Fd(), while StandardErrorFileDescriptor is set to cwd.Fd() (systemd.go:475-477).PrivateDevices, PrivateTmp, PrivateMounts, ProtectControlGroups, ProtectKernelTunables, ProtectKernelModules, ProtectKernelLogs, ProtectClock, RestrictSUIDSGID, and LockPersonality; sets DevicePolicy = "closed", ProtectProc = "invisible", ProcSubset = "pid", RestrictNamespaces = uint64(0), and SystemCallArchitectures = []string{"native"} (systemd.go:478-493).AF_UNIX, AF_INET, and AF_INET6. The system-call deny list is @clock, @cpu-emulation, @debug, @module, @mount, @obsolete, @privileged, @raw-io, @reboot, and @swap (systemd.go:492-494)./run/opencode-pty, /run/dbus/system_bus_socket, /run/docker.sock, /run/user/1000/bus, or /var/run/docker.sock. CPU, memory, tasks, and I/O accounting are enabled; CPU quota is 500*time.Millisecond per second (50%), MemoryHigh = 384 MiB, MemoryMax = 512 MiB, TasksMax = 64, and RuntimeMaxUSec derives from the selected runtime in seconds (systemd.go:495-504).maxAdmissionsPerMinute = 120 and shows connection tracking, admission history, repeated ClientState identity queries, Unix polling in 250-ms intervals, protocol-header allocation with protocol.HeaderSize, random-value generation via rand.Read, FD cleanup, framed error writing, write deadlines using operationTimeout, output draining using outputDrainTimeout, and transient-unit stopping paths.