52 lines
2.2 KiB
Nix
52 lines
2.2 KiB
Nix
{ writeShellScriptBin
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, coreutils
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, findutils
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, gnugrep
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, iproute2
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, systemd
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}:
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# jellyfin-mpv-shim keeps a persistent socket to the Jellyfin server. When the
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# machine drops off the network that socket dies, but the process stays alive
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# and the unit stays "active" — running yet deaf to cast requests, the "up but
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# not working, restart it by hand" case. systemd can't see this: nothing
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# crashes and the shim speaks no health protocol, so we probe the real thing —
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# is its MainPID still holding a live (established, non-loopback) connection?
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#
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# check (default) one tick, run by a 60s timer: restart if online but
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# not connected, rate-limited to one restart per 5 min
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# wait-online block until a real address exists; used as ExecStartPre so the
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# unit only starts once online
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writeShellScriptBin "jellyfin-mpv-shim-watchdog" ''
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set -u
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service="jellyfin-mpv-shim.service"
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stamp="''${XDG_RUNTIME_DIR:-/run/user/$(${coreutils}/bin/id -u)}/jellyfin-mpv-shim-watchdog.stamp"
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# A global-scope address on a non-loopback interface — true for a LAN IP too,
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# so this needs no server URL and works whether Jellyfin is local or remote.
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network_up() { ${iproute2}/bin/ip -o addr show scope global up 2>/dev/null | ${gnugrep}/bin/grep -q .; }
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if [ "''${1:-check}" = wait-online ]; then
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while ! network_up; do ${coreutils}/bin/sleep 5; done
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exit 0
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fi
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# Healthy: MainPID owns an established socket to something other than loopback.
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pid="$(${systemd}/bin/systemctl --user show -p MainPID --value "$service" 2>/dev/null)"
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if [ "''${pid:-0}" != 0 ] && ${iproute2}/bin/ss -tnpH state established 2>/dev/null \
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| ${gnugrep}/bin/grep "pid=$pid," \
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| ${gnugrep}/bin/grep -qv -e '127\.0\.0\.1' -e '\[::1\]'; then
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exit 0
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fi
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# Not connected: only worth restarting once the network is actually back...
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network_up || exit 0
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# ...and not if we already restarted within the last 5 minutes.
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[ -e "$stamp" ] && [ -n "$(${findutils}/bin/find "$stamp" -mmin -5 2>/dev/null)" ] && exit 0
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: > "$stamp"
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echo "jellyfin-mpv-shim-watchdog: online but no live connection -> restarting $service"
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${systemd}/bin/systemctl --user restart "$service"
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''
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