fix: detect conflicting I2C controllers

install.sh

@@ -12,6 +12,32 @@ done
 echo "[1/8] 检查 Raspberry Pi I2C..."
 [ -e /dev/i2c-1 ] || { echo "错误：/dev/i2c-1 不存在。先 sudo raspi-config -> Interface Options -> I2C -> Enable，然后重启。"; exit 1; }
 
+# A running copy of this project is expected during an upgrade. Any other
+# process holding the shared bus could race OLED/MCU writes, so report it and
+# let the user decide how that process should be managed.
+i2c_conflict_pids() {
+  local allowed_pid pid
+  allowed_pid="$(systemctl show -p MainPID --value pigway-pi-control.service 2>/dev/null || true)"
+  for pid in $(fuser /dev/i2c-1 2>/dev/null || true); do
+    case "$pid" in
+      ''|*[!0-9]*) continue ;;
+    esac
+    [ "$pid" = "$$" ] && continue
+    [ "$pid" = "$allowed_pid" ] && continue
+    kill -0 "$pid" 2>/dev/null && echo "$pid"
+  done
+}
+
+I2C_CONFLICTS="$(i2c_conflict_pids)"
+if [ -n "$I2C_CONFLICTS" ]; then
+  echo "ERROR: /dev/i2c-1 is already in use by another process:" >&2
+  while read -r pid; do
+    ps -p "$pid" -o pid=,user=,comm=,args= >&2 || true
+  done <<< "$I2C_CONFLICTS"
+  echo "Stop or reconfigure the conflicting OLED/LED controller, then run the installer again." >&2
+  exit 1
+fi
+
 echo "[2/8] 等待 APT/DPKG..."
 for i in $(seq 1 60); do
   if ! fuser /var/lib/dpkg/lock-frontend /var/lib/apt/lists/lock /var/cache/apt/archives/lock >/dev/null 2>&1; then break; fi
@@ -30,11 +56,6 @@ echo "$SCAN" | grep -qi '3c' || echo "警告：未扫描到 OLED 0x3C"
 echo "$SCAN" | grep -qi '0d' || echo "警告：未扫描到控制 MCU 0x0D"
 
 echo "[5/8] 安装程序与配置..."
-if systemctl list-unit-files 2>/dev/null | grep '^temp-control.service' >/dev/null; then
-  echo "检测到旧 temp-control.service，正在停止并禁用..."
-  systemctl disable --now temp-control.service 2>/dev/null || true
-fi
-pkill -f '/temp_control/temp_control' 2>/dev/null || true
 mkdir -p /usr/local/share/pigway-pi-control
 install -m 0644 app/oled_font_5x7.bin /usr/local/share/pigway-pi-control/oled_font_5x7.bin
 mkdir -p /usr/local/share/pigway-pi-control/web
@@ -118,8 +139,8 @@ check "OLED pages 0..3" grep -Fq 'cmd(0x22);cmd(0);cmd(3)' "$APP"
 check "UI CPU/TMP/DSK" grep -Fq 'f"TMP {temp:.1f}C"' "$APP"
 check "UI IP4/IP6" grep -Fq 'ip_label' "$APP"
 check "UI right column x=72" grep -Fq 'draw_text_5x7(pix,72,y,right[row])' "$APP"
-legacy_stopped() { ! systemctl is-active --quiet temp-control.service; }
-check "Legacy service stopped" legacy_stopped
+no_other_i2c_owner() { [ -z "$(i2c_conflict_pids)" ]; }
+check "No other I2C owner" no_other_i2c_owner
 check "Service running" systemctl is-active --quiet pigway-pi-control.service
 check "API/Web service running" systemctl is-active --quiet pigway-pi-control-api.service
 check "API/Web version 3.6.0" grep -Fq 'APP_VERSION="3.6.0"' /usr/local/sbin/pigway-pi-control-api