add available disk space to cmd base

Author: samfreund

photon-core/src/main/java/org/photonvision/common/hardware/HardwareManager.java

@@ -44,7 +44,7 @@ public class HardwareManager {
     private final HardwareConfig hardwareConfig;
     private final HardwareSettings hardwareSettings;
 
-    private final MetricsManager metricsManager;
+    public final MetricsManager metricsManager;
 
     @SuppressWarnings({"FieldCanBeLocal", "unused"})
     private final StatusLED statusLED;

photon-core/src/main/java/org/photonvision/common/hardware/metrics/MetricsManager.java

@@ -190,6 +190,19 @@ public double getUsedDiskPct() {
         }
     }
 
+    /**
+     * Get the percentage of disk space that's available.
+     *
+     * @return The available disk space in bytes, or -1.0 if the command fails or parsing fails.
+     */
+    public double getDiskSpaceAvailable() {
+        try {
+            return Double.parseDouble(safeExecute(cmds.diskSpaceAvailableCommand));
+        } catch (NumberFormatException e) {
+            return -1.0;
+        }
+    }
+
     // This is here so we don't spam logs if it fails
     boolean npuParseWarning = false;
 

photon-core/src/main/java/org/photonvision/common/hardware/metrics/cmds/CmdBase.java

@@ -34,6 +34,8 @@ public class CmdBase {
     public String npuUsageCommand = "";
     // Disk
     public String diskUsageCommand = "";
+    public String diskSpaceAvailableCommand = "";
+
     // Uptime
     public String uptimeCommand = "";
 

photon-core/src/main/java/org/photonvision/common/hardware/metrics/cmds/LinuxCmds.java

@@ -36,5 +36,6 @@ public void initCmds(HardwareConfig config) {
 
         // Disk
         diskUsageCommand = "df ./ --output=pcent | tail -n +2 | tr -d '%'";
+        diskSpaceAvailableCommand = "df ./ --output=avail | tail -n +2";
     }
 }