Portability: sysfs-only sensors with thermal-zone fallback, /sys/block disk discovery, fs blacklist, pwrstat/NUT/apcupsd UPS, login shell from passwd, templated unit + install for any user, cross-compile targets

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

deploy/install.sh

@@ -1,11 +1,32 @@
 #!/bin/sh
-# Install the built binary and unit on this host, then (re)start the service.
+# Install the built binary and a systemd unit on this host, then (re)start the service.
+# Runs as the user who should own the terminals (their login shell, their sudo rights);
+# needs sudo only for the copy into /usr/local/bin and the unit install.
+#
+#   HAMLAB_USER   user the daemon runs as        (default: the invoking user)
+#   PREFIX        binary directory               (default: /usr/local/bin)
 set -eu
 cd "$(dirname "$0")/.."
-sudo install -m 0755 bin/hamlab /usr/local/bin/hamlab
-sudo install -m 0644 deploy/hamlab.service /etc/systemd/system/hamlab.service
+
+USER_NAME="${HAMLAB_USER:-${SUDO_USER:-$(id -un)}}"
+GROUP_NAME="$(id -gn "$USER_NAME")"
+HOME_DIR="$(getent passwd "$USER_NAME" | cut -d: -f6)"
+PREFIX="${PREFIX:-/usr/local/bin}"
+[ -n "$HOME_DIR" ] || { echo "no home dir for $USER_NAME" >&2; exit 1; }
+
+unit=$(mktemp)
+sed -e "s|@USER@|$USER_NAME|g" -e "s|@GROUP@|$GROUP_NAME|g" -e "s|@HOME@|$HOME_DIR|g" -e "s|@PREFIX@|$PREFIX|g" \
+  deploy/hamlab.service > "$unit"
+
+sudo install -m 0755 bin/hamlab "$PREFIX/hamlab"
+sudo install -m 0644 "$unit" /etc/systemd/system/hamlab.service
+rm -f "$unit"
 sudo systemctl daemon-reload
-sudo systemctl enable --now hamlab.service >/dev/null
+sudo systemctl enable hamlab.service >/dev/null
+if [ ! -f "$HOME_DIR/apps/hamlab/config.json" ]; then
+  echo "No config yet. Set a password, then start:  $PREFIX/hamlab passwd && sudo systemctl start hamlab" >&2
+  exit 0
+fi
 sudo systemctl restart hamlab.service
 sleep 1
-systemctl is-active hamlab.service && /usr/local/bin/hamlab version
+systemctl is-active hamlab.service && "$PREFIX/hamlab" version