Offline Update (.jar replace) (#340)

Allows users to upload a new JAR to a Pi. Also bumps the pi image to increase the heap size.

photon-core/src/main/java/org/photonvision/common/util/file/ProgramDirectoryUtilities.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) Photon Vision.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.photonvision.common.util.file;
+
+import java.io.File;
+import java.net.URISyntaxException;
+
+public class ProgramDirectoryUtilities {
+    private static String getJarName() {
+        return new File(
+                        ProgramDirectoryUtilities.class
+                                .getProtectionDomain()
+                                .getCodeSource()
+                                .getLocation()
+                                .getPath())
+                .getName();
+    }
+
+    private static boolean runningFromJAR() {
+        String jarName = getJarName();
+        return jarName.contains(".jar");
+    }
+
+    public static String getProgramDirectory() {
+        if (runningFromJAR()) {
+            return getCurrentJARDirectory();
+        } else {
+            return System.getProperty("user.dir");
+        }
+    }
+
+    private static String getCurrentJARDirectory() {
+        try {
+            return new File(
+                            ProgramDirectoryUtilities.class
+                                    .getProtectionDomain()
+                                    .getCodeSource()
+                                    .getLocation()
+                                    .toURI()
+                                    .getPath())
+                    .getParent();
+        } catch (URISyntaxException exception) {
+            exception.printStackTrace();
+        }
+
+        return null;
+    }
+}