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../../.local/share/opencode-v2-pilot/supervisor/internal/supervisor/systemd.go and ../../.local/share/opencode-v2-pilot/supervisor/internal/supervisor/systemd_test.go.github.com/coreos/go-systemd/v22/dbus.PathBusEscape(path string) string serializes special characters using systemd’s D-Bus object-path rules; subsequently updated ../../.local/share/opencode-v2-pilot/supervisor/internal/supervisor/systemd.go.internal/supervisor/auth.go, internal/supervisor/server.go, internal/supervisor/server_test.go, internal/supervisor/auth_test.go, cmd/supervisor/main.go, opencode-pty-supervisor.service, opencode-pty.slice, and PROTOCOL.md.internal/supervisor/server.go failed parsing at receiveStart, receiveExact, listen, socketPair, randomUnitName, writeError, writeAll, and closeFDs; root cause shown at copyOutput() was a missing closing brace around the if count > 0 block. Updated server.go to repair syntax.socketPair() passed [2]int values to closeFDs, which accepted []int, at internal/supervisor/server.go:332 and :336; updated server.go to fix the type mismatch.cmd/launcher passed, cmd/supervisor built with no test files, internal/protocol passed, and internal/supervisor passed in 0.004s./tmp/opencode/systemd-v255/src/core/dbus-service.c that transient properties StandardInputFileDescriptor, StandardOutputFileDescriptor, and StandardErrorFileDescriptor consume D-Bus Unix FDs via bus_set_transient_std_fd(), which reads signature "h" and duplicates the descriptor with fcntl(fd, F_DUPFD_CLOEXEC, 3).internal/supervisor/auth.go, internal/supervisor/server.go, internal/supervisor/systemd.go, and opencode-pty-supervisor.service.go test -race ./... detected races in TestReceiveStartWithDirectoryDescriptor and TestReceiveStartHandlesFragmentedHeader: each test deferred closing an *os.File while a spawned goroutine concurrently called its Fd() method (server_test.go:24/39 and :85/91).internal/supervisor/server_test.go; subsequent race run passed: cmd/launcher cached, cmd/supervisor had no tests, internal/protocol cached, and internal/supervisor passed in 1.017s.go.mod, go.sum, PROTOCOL.md, opencode-pty.slice, opencode-pty-supervisor.service, cmd/supervisor/main.go, cmd/launcher/main.go, cmd/launcher/main_test.go, internal/protocol/frame.go, internal/protocol/frame_test.go, internal/supervisor/auth.go, internal/supervisor/auth_test.go, internal/supervisor/server.go, internal/supervisor/server_test.go, internal/supervisor/systemd.go, and internal/supervisor/systemd_test.go.internal/supervisor/systemd.go defined fixed identifiers and limits: clientService = "opencode-v2.service", supervisorService = "opencode-pty-supervisor.service", ptySlice = "opencode-pty.slice", expectedClientCgroup = "/system.slice/opencode-v2.service", launcherPath = "/home/byk/.local/share/opencode-v2-pilot/supervisor/bin/opencode-pty-launcher", transient-unit grammar ^opencode-pty-[0-9a-f]{32}\.service$, and stopTimeout = 15 * time.Second.systemdManager.ClientState() retrieved and type-checked MainPID, ActiveState, and ControlGroup for opencode-v2.service; Start() used StartTransientUnitContext(ctx, name, "fail", properties, result) and required job result "done"; StopAndWait() validated the unit name, used StopUnitContext(..., "replace", ...), waited up to 15 seconds for UnitRemoved, and treated org.freedesktop.systemd1.NoSuchUnit or inactive state as stopped.systemdManager.Wait() used a private system-bus connection and subscribed to org.freedesktop.DBus.Properties.PropertiesChanged for the escaped unit object path plus org.freedesktop.systemd1.Manager.UnitRemoved filtered by unit name; it decoded Result, ExecMainCode, and ExecMainStatus after failed, exited, or inactive state.CleanupOrphans() listed opencode-pty-*.service units, required the strict unit-name regex and exactly one BindsTo value equal to opencode-pty-supervisor.service, then called StopAndWait().OpenCode isolated PTY <name>, Type=exec, Slice=opencode-pty.slice, BindsTo/After=opencode-pty-supervisor.service, User=byk, Group=byk, NoNewPrivileges=true, UMask=0077, KillMode=control-group, KillSignal=15, FinalKillSignal=9, SendSIGKILL=true, TimeoutStopUSec=15,000,000, OOMPolicy=kill, Delegate=false, RemainAfterExit=true, and CollectMode=inactive.base64.RawURLEncoding) and passed Unix FDs using StandardInputFileDescriptor=stream, StandardOutputFileDescriptor=stream, and StandardErrorFileDescriptor=cwd; inaccessible paths were /run/dbus/system_bus_socket, /run/docker.sock, /run/user/1000/bus, and /var/run/docker.sock; positive runtimeSec became RuntimeMaxUSec.1000 and /usr/bin/script from util-linux 2.39.3.internal/supervisor/systemd.go failed because its expected Wait() loop context no longer matched; two subsequent updates to the same file succeeded./run/dbus/system_bus_socket, /run/docker.sock, /run/user/1000/bus, and /var/run/docker.sock.cmd/launcher, cmd/supervisor, internal/protocol, and internal/supervisor.bin/opencode-pty-supervisor as a dynamically linked x86-64 ELF and bin/opencode-pty-launcher as a statically linked x86-64 ELF, both using Go 1.22.2, GOOS=linux, GOARCH=amd64, GOAMD64=v1, CGO_ENABLED=1, and -trimpath=true; supervisor dependencies were github.com/coreos/go-systemd/v22 v22.5.0, github.com/godbus/dbus/v5 v5.1.0, and golang.org/x/sys v0.20.0.internal/supervisor/systemd.go, internal/supervisor/server.go, and opencode-pty-supervisor.service; added privileged integration checklist ROOT-ACCEPTANCE.md.systemd-analyze verify warned: opencode-pty-supervisor.service: Command /usr/local/libexec/opencode-pty-supervisor is not executable: No such file or directory.bin/opencode-pty-supervisor was 4,354,682 bytes, mode 755, owner byk:byk, SHA-256 e83a5beba354533c3bbc9f3680909c0df89bae852b4c9990d14d0f934fa9e9f5; bin/opencode-pty-launcher was 1,995,648 bytes, mode 755, owner byk:byk, SHA-256 d4b83497e2fc02901e5c7a2c83415a76252a137e893ee7f86d6e97f0d9fa8fcb.cmd/launcher/main_test.go; ordinary and race suites passed afterward./tmp/opencode/launcher-smoke.WPfXYw.internal/supervisor/systemd.go, cmd/launcher/main.go, cmd/launcher/main_test.go, internal/protocol/frame.go, and PROTOCOL.md; a follow-up correction also updated internal/protocol/frame.go.cmd/launcher (0.036s), internal/protocol (0.004s), and internal/supervisor (0.004s), while race tests passed in those packages in 1.072s, 1.017s, and 1.017s, respectively; cmd/supervisor built with no test files.bin/opencode-pty-supervisor was 4,354,826 bytes, mode 755, owner byk:byk, SHA-256 65f00b20269806f513f5c6a479a7ca051db6a334ca4549121e5b813bbdf75989; bin/opencode-pty-launcher was 1,996,238 bytes, mode 755, owner byk:byk, SHA-256 f97c546f46b6f2b818638c69ced6e461174549207225cd034ecf65da1017c20d./home/byk/.local/share/opencode-v2-pilot/supervisor; no repository files, current plugins, or installed system units were changed, and no services were installed, started, stopped, or restarted.go.mod, go.sum, PROTOCOL.md, ROOT-ACCEPTANCE.md, opencode-pty-supervisor.service, opencode-pty.slice, cmd/supervisor/main.go, cmd/launcher/main.go, cmd/launcher/main_test.go, internal/protocol/frame.go, internal/protocol/frame_test.go, internal/supervisor/auth.go, internal/supervisor/auth_test.go, internal/supervisor/server.go, internal/supervisor/server_test.go, internal/supervisor/systemd.go, internal/supervisor/systemd_test.go, bin/opencode-pty-supervisor, and bin/opencode-pty-launcher.SO_PEERCRED plus mandatory SO_PEERPIDFD authentication; exact opencode-v2.service MainPID, active-state, and cgroup checks; bounded binary framing, session count, socket buffers, arguments, and I/O frames; secure SCM_RIGHTS cwd transfer with descriptor metadata verification; random 128-bit fixed-grammar transient-unit names; direct StartTransientUnitContext with D-Bus Unix-FD properties; fixed isolation/lifecycle properties, monitoring, cleanup, and structured exit results; fixed launcher environment, cwd descriptor handling, canonical base64 argument grammar, shell quoting, and /usr/bin/script execution; strict orphan cleanup by unit name and BindsTo; root and slice unit definitions; and protocol, authentication, descriptor-transfer, fragmentation, launcher, and unit tests./usr/local/libexec and never runs a root service from the user-writable source directory.gofmt, go test ./..., go test -race ./..., go vet ./..., both production builds, and an exact built-launcher cwd/exec smoke test.systemd-analyze verify warning about missing /usr/local/libexec/opencode-pty-supervisor was expected because installation was forbidden; remaining privileged integration and adversarial acceptance checks were documented in ROOT-ACCEPTANCE.md.