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services.flix: throttle downloads when /var/download runs low
Adds download-space-guard: a 5-min oneshot that caps sabnzbd and
transmission speeds once free space on /var/download drops below 100 GiB,
and pauses sabnzbd below a 15 GiB floor. This prevents a full disk from
hard-wedging sabnzbd with an unrecoverable "Disk full! Forcing Pause";
the guard auto-resumes once space frees up.
Assisted-by: Claude Code (claude-opus-4-8)
author
lassulus
date
(Jun 16, 2026, 12:11 PM CEST)
commit
abf88e33
abf88e33df2436c383e2948703efb493cc35d1fe
parent
285763af
285763affb7f933313c20f8b0ecc216449572177
+53
+53
2configs/services/flix/default.nix
+53
2configs/services/flix/default.nix
···
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'';
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};
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# throttle downloads when /var/download runs low, so a full disk can no
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# longer hard-wedge sabnzbd with an unrecoverable "Disk full! Forcing Pause".
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# below THRESH GiB free: cap sabnzbd + transmission to a trickle.
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# below FLOOR GiB free: pause sabnzbd entirely (auto-resumes when space frees).
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systemd.services.download-space-guard = {
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wantedBy = [ "multi-user.target" ];
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after = [ "sabnzbd.service" ];
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startAt = "*:0/5";
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path = [
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pkgs.curl
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pkgs.coreutils
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pkgs.gnugrep
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pkgs.gawk
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pkgs.transmission_4
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];
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script = ''
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set -efu
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DIR=/var/download
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THRESH=100
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FLOOR=15
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avail=$(df -Pk "$DIR" | awk 'NR==2 {print int($4 / 1024 / 1024)}')
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key=$(grep -E '^api_key' /var/lib/sabnzbd/sabnzbd.ini | head -1 | cut -d= -f2 | tr -d ' ')
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sab() {
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curl -fsS --max-time 15 "http://127.0.0.1:8080/api?output=json&apikey=$key&$1" >/dev/null
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}
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tr_remote() {
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transmission-remote 128.0.0.1:9091 "$@" >/dev/null || :
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}
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if [ "$avail" -lt "$FLOOR" ]; then
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echo "free ''${avail}G < ''${FLOOR}G floor: pausing sabnzbd, throttling transmission to 500 KB/s"
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sab "mode=pause"
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tr_remote -d 500
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elif [ "$avail" -lt "$THRESH" ]; then
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echo "free ''${avail}G < ''${THRESH}G: throttling sabnzbd to 5 MB/s, transmission to 2 MB/s"
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sab "mode=resume"
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sab "mode=config&name=speedlimit&value=5M"
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tr_remote -d 2000
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else
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echo "free ''${avail}G >= ''${THRESH}G: removing download speed limits"
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sab "mode=resume"
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sab "mode=config&name=speedlimit&value=0"
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tr_remote -D
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fi
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'';
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serviceConfig = {
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Type = "oneshot";
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User = "root";
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};
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};
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security.acme.defaults.email = "spam@krebsco.de";
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security.acme.acceptTerms = true;
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security.acme.certs."yellow.r".server = config.krebs.ssl.acmeURL;