Update 'README.md'

README.md

@@ -27,7 +27,12 @@ sudo systemctl start prometheus-node-exporter
 
 Installing a collector for the metrics now available on `:9100` is left as an exercise for the reader, but I figure if you're devoted to tracking system metrics enough to try and install prometheus on your Steam Deck you've probably already got a setup for that.
 
+## Future Incompatabilities
+
+If and when SteamOS is "rebased" onto a newer version of Arch (that is, the `VERSION_ID` in `/etc/os-release` is incremented), you'll need to update the `VERSION_ID` in `/var/lib/extensions/prometheus-node-exporter/usr/lib/extension-release.d/extension-release.prometheus-node-exporter` to match, then re-merge the extensions via `sudo systemd-sysext refresh`.
+
 ## References
 
 * <https://tailscale.com/blog/steam-deck/>
 * <https://blogs.igalia.com/berto/2022/09/13/adding-software-to-the-steam-deck-with-systemd-sysext/>
+* <https://forum.tailscale.com/t/steam-deck-support/2583/7>

install.sh

@@ -9,11 +9,11 @@ cd "${dir}"
 BINARY=$(curl https://api.github.com/repos/prometheus/node_exporter/releases/latest | jq -r '.assets[] | select(.name | contains("linux-amd64")) | .browser_download_url')
 curl -L $BINARY -o node-exporter.tgz
 
-mkdir -p prometheus/usr/{bin,lib/{systemd/{system,system-preset},extension-release.d}}
+mkdir -p prometheus/usr/{bin,lib/{systemd/system,extension-release.d}}
 tar xzf node-exporter.tgz
 
 cp -vrf node_exporter-*/node_exporter prometheus/usr/bin/node_exporter
-cat > prometheus/usr/lib/systemd/system/prometheus-node-exporter.service <<- EOM
+cat > /etc/systemd/system/prometheus-node-exporter.service <<- EOM
 [Unit]
 Description=Prometheus exporter for machine metrics
 Requires=network-online.target
@@ -31,11 +31,6 @@ ProtectSystem=strict
 WantedBy=multi-user.target
 EOM
 
-cat > prometheus/usr/lib/systemd/system-preset/00-prometheus-node-exporter.preset <<- EOM
-# enabling prometheus
-enable prometheus-node-exporter.service
-EOM
-
 source /etc/os-release
 echo -e "SYSEXT_LEVEL=1.0\nID=steamos\nVERSION_ID=${VERSION_ID}" >> prometheus/usr/lib/extension-release.d/extension-release.prometheus-node-exporter