936c8bb81c
srcds_run is a shell script that cd's to its own dirname before exec'ing srcds_linux, so WorkingDirectory has no effect — the binary's path is what determines where the engine reads gameinfo.txt and addons from. Pointing at installation/srcds_run resolved everything against the lower layer, so overlay-provided Metamod/SourceMod plugins and cfgs (zonemod, confogl) never loaded. Switch to runtime/%i/merged/srcds_run so the engine sees the merged tree. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
73 lines
3 KiB
Desktop File
73 lines
3 KiB
Desktop File
[Unit]
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Description=left4me server instance %i
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After=network-online.target
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Wants=network-online.target
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# Bound the restart loop. Without these, a persistent ExecStartPre or
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# ExecStart failure spins indefinitely. Note: these are [Unit]-section
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# directives (systemd 230+), not [Service].
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StartLimitBurst=5
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StartLimitIntervalSec=60s
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[Service]
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Type=simple
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User=left4me
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Group=left4me
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EnvironmentFile=/etc/left4me/host.env
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EnvironmentFile=/var/lib/left4me/instances/%i/instance.env
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# `-` prefix: chdir failure is non-fatal. systemd applies WorkingDirectory
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# before every Exec line — including ExecStartPre — but the merged dir only
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# exists once ExecStartPre's overlay mount succeeds. With `-`, ExecStartPre
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# runs in the unit's home (cwd doesn't matter for the mount helper); the
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# ExecStart re-applies WorkingDirectory after the mount and finds the dir.
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WorkingDirectory=-/var/lib/left4me/runtime/%i/merged/left4dead2
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# Single source of truth for the kernel-overlayfs mount lifecycle: the web
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# app's start_instance only stages cfg files and asks systemd to enable+
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# start this unit; the actual `mount -t overlay` lives here so reboot
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# auto-start works the same as a UI-driven start. ExecStopPost mirrors it
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# so the unmount lives in the same place — no Python-side _mounter needed
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# in stop/delete/reset paths. Both helper verbs are idempotent.
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#
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# `+` prefix runs the helper as PID 1 (root, no sandbox). Required because
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# the unit has NoNewPrivileges=true, which blocks sudo's setuid escalation
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# — and the helper itself needs root to nsenter into PID 1's mnt namespace
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# anyway. ExecStopPost (not ExecStop) so unmount runs after the cgroup is
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# cleared; ExecStop runs while srcds is still alive and would EBUSY.
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ExecStartPre=+/usr/local/libexec/left4me/left4me-overlay mount %i
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# Run from the merged overlay, NOT installation/. srcds_run is a shell
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# script that `cd`s to its own dirname before exec'ing srcds_linux, so the
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# binary's path determines where the engine reads gameinfo.txt and addons
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# from — WorkingDirectory has no effect. Invoking installation/srcds_run
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# would resolve everything against the lower layer and never see overlay-
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# provided plugins (Metamod/SourceMod) or cfgs (zonemod, confogl).
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ExecStart=/var/lib/left4me/runtime/%i/merged/srcds_run -game left4dead2 +hostport ${L4D2_PORT} $L4D2_ARGS
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ExecStopPost=+/usr/local/libexec/left4me/left4me-overlay umount %i
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Restart=on-failure
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RestartSec=5
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# Resource control baseline — see docs/superpowers/specs/2026-05-09-l4d2-server-host-perf-baseline-design.md
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Slice=l4d2-game.slice
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Nice=-5
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IOSchedulingClass=best-effort
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IOSchedulingPriority=4
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OOMScoreAdjust=-200
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MemoryHigh=1.5G
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MemoryMax=2G
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TasksMax=256
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LimitNOFILE=65536
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KillSignal=SIGINT
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TimeoutStopSec=15s
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LogRateLimitIntervalSec=0
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# Hardening (unchanged from previous baseline).
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NoNewPrivileges=true
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PrivateTmp=true
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PrivateDevices=true
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ProtectHome=true
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ProtectSystem=strict
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ReadOnlyPaths=/var/lib/left4me/installation /var/lib/left4me/overlays
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ReadWritePaths=/var/lib/left4me/runtime/%i
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RestrictSUIDSGID=true
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LockPersonality=true
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[Install]
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WantedBy=multi-user.target
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